August 26, 2016 | Author: Harriet Eaton | Category: N/A
1 EBI Track 200 TI21 Audio Frequency Track Circuit Technical Manual M125401A4 Scope: This manual covers non-electrified ...
EBI Track 200 TI21 Audio Frequency Track Circuit
Technical Manual M125401A4
Scope: This manual covers non-electrified and double rail traction return applications. Single rail traction return applications are covered separately.
Issue 4: October 2011
Amendment Record Issue
Date
From
To
Details
0p1 1
1 2
2
3
3
4
First release – ECR12490 Digital Rx added. Ref to Single Rail Application Manual added. ECR61757 refers. Update to close issues arising from Digital Rx Safety Case. ECR62606 refers. General update to reflect current practice. ECR6-26113.
July 2006 February 2008 October 2008 October 2011
Bombardier Transportation Estover Close Estover Plymouth PL6 7PU Tel : +44 1752 725000 Fax : +44 1752 725001 Email:
[email protected] This document and its contents are the property of Bombardier Inc. or its subsidiaries. This document contains confidential proprietary information. The reproduction, distribution, utilisation or the communication of this document or any part thereof, without express authorisation is strictly prohibited. Offenders will be held liable for the payment of damages.
(ii)
M125401A4 Issue 4: October 2011 Confidential and proprietary.
2011 Bombardier Inc. or its subsidiaries. All rights reserved.
M125401A4 Issue 4: October 2011 Confidential and proprietary.
(iii)
FOREWORD This manual describes the operation and application of the Bombardier EBI Track 200 TI21 Audio Frequency track circuit equipment. Companion reference documents are: • Single Rail Manual M580000626A4. • Application Notes These are referenced in section 1.6.
SAFETY CONSIDERATIONS If there is concern that the parameters specified in this handbook cannot be met for a particular intended installation, please contact the manufacturer. It may still be possible to apply EBI Track 200 by specifying alternative combinations of operating parameters by providing the manufacturer with full information regarding the intended installation, who may be able to specify modification to the parameters. Some extreme combinations may require additional safety and monitoring measures, of which the manufacturer will advise. Note that any deviations from this manual must be approved by the relevant rail authority before putting into service. If deviations from this manual are proposed, it is a condition that the manufacturer has a representative in attendance (for which it reserves the right to make a call-out charge to the operator). In no other circumstances but those described above will the manufacturer accept liability for any adverse consequences arising from the operation of the EBI Track 200 Track Circuit.
MODIFICATION STATES The equipment label on each item of EBI Track 200 equipment contains a panel of numbers that is used to indicate the modification status or MOD STRIKE number (1,2,3,etc.) of that item of equipment. The modification panel, identified as M/S, for an unmodified piece of equipment is depicted below: S/N
231197
Y/M
1995
1
2
3
4
5
6
7
8
9
10
M/S:
All 10 numbers are unmarked which indicates that the unit has not been modified and is at MOD STRIKE ZERO status. An item of equipment which has been subject to modification number one, it has the number 1 'struck out', this may be done either by scratching/stamping a diagonal line across the number 1 square or by deleting the number one with a black permanent marker pen. At each additional modification, the next number in sequence will be 'struck out', the last struck out number gives the MOD STRIKE status, e.g. if numbers 1,2,3,4,5 and 6 are struck out, that item of equipment would be at MOD STRIKE 6 status
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M125401A4 Issue 4: October 2011 Confidential and proprietary.
TECHNICAL ENQUIRIES Please send to
[email protected]
ABBREVIATIONS The abbreviations listed below are commonly used in this handbook. A, amps ac, AC BRB CMD dc, DC EBI Track 200 TI21 ETU IRJ LMU(Tx) LMU(TU) RX, Rx SPETU TCU TI21, TI 21 TTM TX, Tx TU V
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Ampere Alternating Current British Rail Board Condition Monitoring Display Direct Current EBI Track 200 TI21 Audio Frequency Track Circuit End Termination Unit Insulated Rail Joint Line matching Unit, Transmitter End Line matching Unit, TU/ETU End Receiver Surge protected ETU. In this manual, the term ETU also applies to SPETU Track Coupling Unit Audio Frequency Track Circuit Style TI21 (former brand name) TI21 Track Circuit Meter Transmitter Tuning Unit Volt
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Contents Page no.
(vi)
1.
INTRODUCTION............................................................................................. 1-1
2.
EQUIPMENT
3.
TRACK CIRCUIT AND TI UNIT TECHNICAL DATA ................................ 3-1
4.
TRACK CIRCUIT DESIGNER’S GUIDE ...................................................... 4-1
5.
SETTING-UP AND COMMISSIONING PROCEDURE ............................... 5-1
6.
MAINTENANCE ............................................................................................. 6-1
7.
EQUIPMENT ORDERING INFORMATION ................................................. 7-1
8.
MISCELLANEOUS INFORMATION AND DRAWINGS ............................ 8-1
9.
TI21 TX/RX EQUIPMENT RECORD CARD ................................................ 9-1
A.
APPENDIX A, TECHNICAL DATA FOR SUPERSEDED PARTS ............... A-1
B.
APPENDIX B, MANUAL CHANGE HISTORY ............................................ B-1
.............................................................................................. 2-1
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M125401A4 Issue 4: October 2011 Confidential and proprietary.
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Section 1 Introduction
Contents 1. 1.1 1.1.1 1.2 1.3 1.3.1 1.3.2 1.3.3 1.4 1.5 1.6
M125401A4 Issue 4: October 2011 Confidential and proprietary.
INTRODUCTION ........................................................................ 2 Safety Requirements .................................................................... 2 Competence of Staff .................................................................... 2 General ........................................................................................ 2 Track Circuit Separation............................................................... 3 General ........................................................................................ 3 Track Circuit Electrical Separation Joint ...................................... 3 Use Of End Termination Units ..................................................... 5 Traction Return Current And Equipotential Bonding .................... 6 ‘Single Rail’ Track Circuits Using Track Coupling Units ............... 6 Additional Reference Material ...................................................... 7
1-1
Section 1 Introduction 1.
INTRODUCTION
1.1
SAFETY REQUIREMENTS The EBI Track 200 TI21 Audio Frequency Track Circuit must be installed and operated within the parameters specified in this handbook. • Safety related applications conditions are given at the beginning of section 4. • Specific Safety Requirements are given in: o Section 2.6 o Section 4.1 o Section 4.3.4 o Section 4.3.7 o Section 5.2 o Section 5.3 o Section 5.4 o Section 5.6 o Section 6.1.4 o Section 6.3 o Section 6.6
1.1.1
Competence of Staff Bombardier recommend that staff responsible for commissioning and maintenance of EBI Track 200 track circuits are able to demonstrate their competence as follows: • EBI Track 200 training course certificate • Manual handling course certificate • Staff working on operational LMUs must be competent to work on voltages higher than 50V since voltages on LMU connections can reach 140V under fault conditions. It is further recommended that access to set-up keys is restricted to trained personnel.
1.2
GENERAL The TI Track Circuit Style 21 is of the jointless type designed for AC or DC electrified areas where high levels of interference (arising principally from 50 Hz harmonics) may be present. The equipment is classified as universal since it meets the onerous immunity requirements of all traction systems and the needs of all known track circuits. EBI Track 200 TI21 track circuits employ eight audio frequencies in the range of 1549 Hz to 2593 Hz, the nominal frequencies are usually referred to by letter, i.e. frequencies A, B, C, D, E, F, G and H. The equipment for the eight nominal frequencies are used as four pairs - A/B, C/D, E/F, and G/H. One pair is used per track and the frequencies are alternated, e.g. 'frequency A' track circuit, then 'frequency B' track circuit, then 'frequency A' track circuit, and so on. Further details of frequency allocation are given in section 4.2.2. A block diagram of a basic track circuit is shown in Figure 1.2. Track Circuit Frequency F2 50m to 1100m
Track Circuit Frequency F1
Track Circuit Frequency F1
20m
Tuning Unit F2
Tuning Unit F1
Transmitter F1
1-2
20m
Tuning Unit F2
Power Supply 24VDC
Receiver F2
110 / 220 VAC
Track Relay
Transmitter F2
Tuning Unit F1
Power Supply 24VDC
Receiver F1
110 / 220 VAC
Track Relay
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 1 Introduction Basic Track Circuit (1435mm gauge)
Fig. 1.2
Standard BR miniature line relays or their equivalent are directly operated by the receiver. It is not necessary to use low powered, high percentage release relays with small contact stacks, or AC immune relays. The TI receiver has an inbuilt delayed pick-up response that obviates the need for "slow to pick-up" relays. The transmitters and receivers are arranged for standard BR relay rack mounting. The track circuit may be configured so as to cater for all types of traction current return systems.
1.3
TRACK CIRCUIT SEPARATION
1.3.1
General The track circuit is of the 'jointless' type, electrical separation of adjacent track circuits is accomplished by tuning the inductance of 20 metres of track, using two track tuning units. The ideal properties of a separation joint are as follows:
1.3.2
(1)
That it embodies a minimum crossover length where one circuit begins and another one ends;
(2)
That a minimum signal is fed in the reverse direction through the joint.
(3)
That failure of any element of the joint is detected.
Track Circuit Electrical Separation Joint The electrical properties of the separation joint will be discussed with reference to the circuit diagram drawing (Figure 1.3.2a) which is a diagram of an electrical separation joint comprising two tuning units. C L Track Circuit Frequency 'A'
Track Circuit Frequency 'B'
Overlap Shunting Zone (Between 2m & 10m Depending on Ballast Conditions) 20 metres for 1435 (nominal) Track Gauge
T1
T1
C1A
LA
C1B
LB
1
1
To Receiver (or Transmitter if in Low Power Mode) C2A
TRA
2 3 4
Earth Screen
To Receiver (or Transmitter if in Low Power Mode) C2B
TRB
2 3 4
To Transmitter (for Normal Power Mode)
To Transmitter (for Normal Power Mode)
5
T2
Earth Screen
5
T2
Electrical Separation Joint Fig. 1.3.2a
M125401A4 Issue 4: October 2011 Confidential and proprietary.
1-3
Section 1 Introduction Each electrical separation joint is associated with two track circuit frequencies, the diagram shows one 'A' frequency track circuit and one 'B' frequency track circuit. 'A' for transmission to or from the left, 'B' for transmission to or from the right. Depending on application the joint may be associated with (i) one transmitter and one receiver, (ii) two transmitters or (iii) two receivers. Each track tuning unit presents a low impedance to one of the frequencies present in the joint, e.g. tuning unit frequency 'A' will present a low impedance, via LA and C2A to the 'B' frequency signal, whilst tuning unit frequency 'B' via LB and C2B presents a low impedance to the 'A' frequency signal, so the transmission of the frequencies is terminated at the low impedances. The inductance of the rails between the two track tuning units is tuned to a high impedance for both the frequencies present by means of the net capacitive reactances in the tuning units. The track tuning unit frequency 'B' tunes the rails to 'B' frequency whilst the tuning unit frequency 'A' tunes the rails to 'A' frequency to give directional tuning, with consequent directional transmission or reception. The following equivalent circuit diagrams (Figure 1.3.2b) show the directional tuning effect. Track Tuning Unit Frequency 'B'
Track Tuning Unit Frequency 'A'
Output Impedance (approx. 1Ω)
Inductance provided by 20m of rail
Signal provided by Transmitter
Loss provided by 20m of rail
Frequency 'A' Equivalent Electrical Circuit
Track Tuning Unit Frequency 'B'
Track Tuning Unit Frequency 'A'
Output Impedance (approx. 1Ω) Loss provided by 20m of rail
Inductance provided by 20m of rail
Signal provided by Transmitter
Frequency 'B' Equivalent Electrical Circuit
Equivalent Circuits Fig. 1.3.2b The voltages appearing in the direction of transmission or reception depend in part upon the losses in the tuned circuits, most of which will be in the rails themselves. The voltage appearing across the low impedance, LA, C2A or LB, C2B (Fig. 1.3.2a) will be determined by the losses in these components alone. For a particular frequency, there is a ratio between the voltage across the tuning unit of that frequency and the voltage across its companion tuning unit; the ratios for each frequency and for various TX/RX arrangements are given in Table 6.1.2H. The low impedance circuits in the tuning units also serve the very important function of shorting the rail-to-rail traction harmonic voltages at the track circuit frequencies. Thus the track circuit frequency component of rail-to-rail traction voltage is kept low enough to avoid swamping the receiver as swamping the receiver can de-energise the relay when the track circuit is clear. The transmitter output and the receiver input provide a low impedance load to the track circuit which is necessary for correct tuning of the tuned area. On the tuning unit, receivers are always connected to terminals 1 and 2. For normal power mode (track circuit lengths of 200 to 1100 metres) the transmitter is connected to terminals 4 and 5, whilst for low power mode (track circuits of 50 to 250 metres long) the transmitter is connected to terminals 1 and 2. Within the tuned area there exists an overlap zone. This is a region where both track circuits will be de-energised by a shunt. The specified shunt value will de-energise both track circuits at the centre of the tuned area, and the shunt value required to drop each track circuit will reduce to zero as the shunt position moves away from that track circuit’s pole tuning unit. 1-4
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 1 Introduction
The length of the overlap zone will depend upon several factors including the drop shunt set for each of the track circuits, ballast conditions and the shunt value. It will generally be between 2m and 10m. The typical variation in the shunt value required to drop the track circuit within the separation joint is indicated in Figure 1.3.2c.
The shunt resistance required in the tuned area falls as the shunt position is moved further into the separation joint from the circuit concerned. The graphs show the relative shunt value required compared to 1Ω at the feed or receive tuning unit track terminations for a 1435mm gauge track.
Shunt Value 1.0 Ω
TC
Track Circuit TC1
TC
1
1.0 Ω
2
Track Circuit TC2
0.3 Ω
0.3 Ω TC
0
TC
2
5m
10m
1
15m
20m
Shunt Value within Separation Joint Fig. 1.3.2c NOTE:
1.3.3
It has been found that the effect of the EBI Track 200 signal coupling into concrete steel reinforcing or DC stray current gathering systems can have a significant effect on overlaps. The specific effect on any individual tuned area is dependant on positioning of the tuned area with respect to the concrete decking, and overlaps may be biased toward one end or the other of the tuned area. There will however always be an overlap area where both track circuits are dropped by a zero ohm shunt, and the overlap will normally include the centre of the tuned area.
Use Of End Termination Units The End Termination Unit is a self-contained tuned circuit for applications where the track circuit isolation using the electrical separation joint is not required. Such applications are: (a)
end feed, or end receive, adjacent to insulated rail joints or,
(b)
centre feed arrangements.
The End Termination Unit employs the same housing as the standard tuning unit, and also the same terminations: Output to track on T1 and T2; Input from transmitter on terminals 4 and 5 for normal power; Output to receiver on terminals 1 and 2; Terminal 3 is the earth screen. For low power mode the transmitter output is connected to terminals 1 and 2. A surge protected version of the ETU (SPETU) exists for use railways usinjg the DC 3rd rail system where high voltage transients can be generated by shorts between the 3rd rail and the running rail. This product, and its applications, are fully described in the Single Rail Manual, M580000626A4.
M125401A4 Issue 4: October 2011 Confidential and proprietary.
1-5
Section 1 Introduction 1.4
TRACTION RETURN CURRENT AND EQUIPOTENTIAL BONDING Traction bonding is the practice of connecting the running rails to the traction substation and to each other to provide a return path for the traction current. It also includes the connection of exposed metal structures that are part of the traction supply system to the running rail for safety reasons. The EBI Track 200 track circuit has been designed to give safe and reliable operation in both AC and DC electrified territory, and with all known types of locomotive. EBI Track 200 can be used in both single and multiple track territory with traction current return arrangements as recommended below. AC:
EBI Track 200 can be used with either single or double rail traction return arrangements, although double rail traction return is recommended to minimise the effects of traction interference and optimise availability.
DC:
Double rail traction return is preferred in DC electrified areas due to the higher currents found in the lower voltage systems.
Examples of traction return bonding are given in Section. 4.
1.5
‘SINGLE RAIL’ TRACK CIRCUITS USING TRACK COUPLING UNITS In some areas, where the track layout is complicated and adjacent tracks are in close proximity, it may not be physically possible to position TUs or ETUs at the trackside because of the limited space available. Using the track circuit in ‘single rail’ mode may solve this problem. This ‘single rail’ operation is achieved by using Track Coupling Units (TCUs) instead of Tuning Units. The tuned area is replaced by an insulated block joint in one running rail. The track circuit functions like the conventional AC track Circuit, i.e. you can have only one Receiver per track circuit and since the traction bonding is done through transverse bonding, the traction return current flows only through one rail and thus reducing the number of Impedance Bonds required. The TCUs are located in the apparatus cases or equipment room, and are connected to the track using 2.5mm2 twisted pair cables. The total cable length between the track and the two TCUs can be up to 200 metres (See section 4.2.4.2). A typical single rail track circuit is depicted in Figure 1.5. Full details of the Single Rail application are given in the Single Rail Manual, M580000626A4.
1-6
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 1 Introduction Track Circuit Frequency F1
Track Circuit Frequency F1
Track Circuit Frequency F2 1 metre max.
IRJ
1 metre max.
IRJ
Track Coupling Unit F1
Track Coupling Unit F2
Transmitter F1
Receiver F2
Track Relay
Track Coupling Unit F2
Track Coupling Unit F1
Transmitter F2
Receiver F1
Power Supply Unit 24VDC
Power Supply Unit 24VDC
220 VAC
220VAC
Track Relay
Basic Track Circuit with Track Coupling Units
1.6
Fig. 1.5
ADDITIONAL REFERENCE MATERIAL The following application notes are available to provide additional information on specialist topics.
M125401A4 Issue 4: October 2011 Confidential and proprietary.
IS580001109A4
TI21 Track Circuits, Guidance Notes for Traction Bonding
TR580011786A4
EBI Track 200 TI21 Track Coupling Unit Circuit Review. Contains rationale for earthing strategy
IS580001448A4
Operation With Concrete Slab Track With Steel Reinforcing Or Iron Lined Tunnels
IS580014943A4
EBI Track 200 TI21, Summary of Fusing and Surge arrestor Arrangements
IS580018381A4
Application Note: Maximum Transmitter and Receiver Feed Lengths When Using LMUs
IS580012852A4
Information Sheet – EBI Track Track Circuit Condition Monitoring
M580000626A4
EBI Track 200 Audio Frequency Track Circuit Style Single Rail Application
M580036853A4
EBI Track Audio Frequency Track Circuit, PC Application Users Manual, Customer Version.
M6/6/118951
TTM Operating Instructions
M6/6/122940
SIT Operating Instructions
1-7
Section 1 Introduction
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1-8
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 2 Equipment
Contents 2. 2.1 2.2 2.3 2.4 2.5 2.6 2.6.1 2.7 2.8 2.8.1 2.8.2 2.8.3 2.8.4
M125401A4 Issue 4: October 2011 Confidential and proprietary.
EQUIPMENT ................................................................................ 2 Transmitter ................................................................................... 2 Receiver ....................................................................................... 3 Tuning Unit (TU) and End Termination Unit (ETU) ...................... 4 Track Coupling Unit (TCU) ........................................................... 4 Line Matching Unit (LMU) ............................................................ 4 Power Supplies ............................................................................ 5 24v dc Power Supply.................................................................... 5 B3 4000 / 3000 Impedance Bond................................................. 6 Test Equipment ............................................................................ 6 TI21 Test Meter (TTM) ................................................................. 6 Rocoil Current Transducer ........................................................... 6 TI21 Shunt Box ............................................................................ 6 Sleeper Insulation Tester (SIT) .................................................... 7
2-1
Section 2 Equipment 2.
EQUIPMENT
2.1
TRANSMITTER A block diagram of the transmitter is shown in Figure 2.1. The carrier is produced by direct digital synthesis (DDS). This entails sampling the level of a digital representation of a sine wave, stored in a PROM, at the appropriate rate to produce an output of the required frequency. The sample rate is changed between that appropriate for the low sideband and that for the high sideband at a frequency of 4.8Hz, thus producing the correct modulation of the output carrier. 'MOD' Input
Interface circuitry
OSC. 1 (32MHz)
÷ USB Step Size
÷ Modulation Rate Sideband Select
18 ACC 18
13
Lookup PROM
LSB Step Size
ACC
18
Delta-Sigma D to A 8 Converter
Analog Power Regulator / Gate
H-Bridge Output Stage
Output Filter
To Tuning Unit
13
18
÷ Within ASIC OSC. 2 (4MHz)
Transmitter Block Diagram Fig. 2.1 The ‘MOD’ input on the front panel allows the internal 4.8Hz modulation to be overridden. If ‘MOD’ is tied to N24 then the output will be continuously at the Low Sideband, if it is tied to B24, then the output will be continuously at the High Sideband. Separate crystal oscillators and divider chains are used to generate the correct sampling rate for each the low and high sidebands, this is so that drift in one oscillator will only affect the frequency of one sideband. This would produce an output which does not correspond to any valid EBI Track 200 signal, so could not become a potential source of false feed to another track circuit. It is important, in order to provide good output regulation and avoid unacceptable increases in output power, that a good quality sine wave is produced by the DDS signal generator. One potential danger in this respect is that certain data or address lines, if failed permanently low or high, could result in the PROM output being closer to a square wave at the carrier frequency, and cause large output increases. It is not possible to avoid this failure mechanism completely, but it is possible to ensure that, if such a failure happens, it will only affect one sideband in this way, and probably corrupt the other sideband to make the overall output invalid. To avoid the possibility of the output changing to something approaching a square wave at the carrier frequency, at least for both sidebands, both the PROM address and data lines are inverted for the upper sideband. Tests have shown that no data or address line failing low or high causes an increase in overall energy to the track, and in many cases makes the track easier to shunt. Samples read out of the PROM are converted into analogue levels using a Delta-Sigma, or one bit, D to A converter, and then fed to the power regulator, which compensates for variation in the unit’s supply voltage (B24). The Delta-Sigma converter does not use a voltage reference, its output switches between the supply rail and ground at a high frequency, and is filtered to produce the analogue output required. The regulator output is gated by a circuit which will not pass the signal if the converter supply voltage is more than a small percentage away from its 2-2
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 2 Equipment correct value. In this way the failure mode of an increase in amplitude into the regulator, causing an increase in overall output power, is avoided. In addition to the transmitter function, the unit contains Health Monitoring circuitry which enables the operation of the unit to be monitored. Output is by means of three Green / Red / Yellow LEDs on the front panel. A green LED indicates OK, red indicates a fault and yellow has a special meaning as defined below. The LEDs are grouped as follows: • Top LED: External power supply – turns red if the input supply is too high or low. • Centre LED: Internal functionality – turns red if the sideband frequencies, the modulation frequency or the output pulse widths are out of specification, or the output drive stage stops switching. • Bottom LED: External load condition – turns red if the load current on the output is too high. This indicates that either the external output wiring is short circuit, or that the output stage is short circuit. Transmitters are frequency dependant, i.e. there is a Transmitter for each TI frequency, i.e. A, B, C, D, E, F, G and H
2.2
RECEIVER A block diagram of the receiver is shown in Figure 2.2. The signal from the track tuning unit is fed to the Front-End block which incorporates an input transformer to isolate the receiver circuit from the tuning unit. The signal is converted to digital format (ADC block) and then filtered by the DSP stage to recover the two sidebands. The sidebands are then demodulated and evaluated to ensure that upper asnd lower sideband signals are present in anti-phase to each other and above the detection threshold (supplied by the Auto-Set block). If the evaluation is true continuously for more than two seconds , the track clear indication output is set to TRUE.
Receiver Block Diagram Fig. 2.2 Key Features • A common Receiver unit is assigned to one of the eight EBI Track 200 frequencies by means of the configuration key. • The Auto-Set feature simplifies the track set-up procedure and front end circuit by eliminating the requirement for sensitivity-setting straps. • Condition monitoring and diagnostic information is available via a four character display and as isolated serial data on a 9-way ‘D-type’ connector. • The Track Clear output is an isolated relay drive signal.
M125401A4 Issue 4: October 2011 Confidential and proprietary.
2-3
Section 2 Equipment 2.3
TUNING UNIT (TU) AND END TERMINATION UNIT (ETU) A Tuning Unit is used to couple energy into a track circuit which is terminated by an electrical separation joint (tuned area). Tuning units are frequency specific, i.e. there is a TU for each of the EBI Track 200 operating frequencies, i.e. A, B, C, D, E, F, G and H. The design utilises only passive components, no power is required for a TU at the trackside. An End Termination Unit is used to couple energy into a track where there is no tuned area, it achieves this by emulating the characteristics of a tuned area. ETUs are generally used in the following situations: • • • •
•
Centre-fed applications At the end of a EBI Track 200 track circuit which adjoins a non-TI track circuit At the end of a EBI Track 200 track circuit which adjoins non-track circuited territory At the end of a EBI Track 200 track circuit which adjoins another EBI Track 200 track circuit where there is insufficient room for a tuned area (so insulated block joints are used), such as in points or crossings At the end of a EBI Track 200 track circuit which adjoins another EBI Track 200 track circuit, but of a different frequency pair (insulated block joints must be used)
TUs and ETUs are frequency dependant, i.e. there is a TU and an ETU for each TI frequency, i.e. A, B, C, D, E, F, G and H. A Surge Protected End Termination Unit (SPETU) has been developed for applications where fault conditions could impose traction voltages across the running rails which would then cause damage to an unprotected ETU. Such fault conditions can be produced by third rail DC traction systems when a short circuit fault develops between the third rail and one of the running rails. The SPETU is identical in function to a standard ETU as described above except that it contains 10A fuses in series with its rail terminals and a surge arrestor in parallel. . SPETUs are frequency dependant, i.e. there is an SPETU for each frequency, i.e. A, B, C, D, E, F, G and H. SPETUs and their application are fully described in the Single Rail Manual, M580000626A4
2.4
TRACK COUPLING UNIT (TCU) The Track Coupling Unit is used to couple energy into a track where: • • •
it is not convenient to mount units on or beside the rails and the maximum track circuit lengths do not exceed 200m and the Transmit end TCU-to-rail distance plus the Receive end TCU-to-rail distance is not more than 200m.
These conditions typically arise in siding and depot areas. TCUs are frequency specific, i.e. there is a TCU for each of the EBI Track 200 operating frequencies A, B, C, D, E, F, G and H. TCUs and their application are fully described in the Single Rail Manual, M580000626A4
2.5
LINE MATCHING UNIT (LMU) The Line Matching Unit allows the distance between the TX and its TU / ETU to be extended to up to 500 metres; the maximum track circuit length is restricted to 970m. The LMU consists of two units : •
2-4
Line Matching Unit (TX) - fitted next to its associated EBI Track 200 transmitter, M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 2 Equipment • Line Matching Unit (TU) - fitted adjacent to the associated tuning unit. LMUs are not frequency dependant, i.e. the same LMU(Tx) or LMU(TU) can be used with any of the EBI Track 200 operating frequencies A to H . 2.6
POWER SUPPLIES
SAFETY REQUIREMENT
2.6.1
The requirements on power supply loading in section 4.3.7 must be observed to guarantee safe operation of EBI Track 200 track circuits.
24V DC POWER SUPPLY The Power Supply is specially designed to be compatible with EBI Track 200 Transmitters and Receivers and AC input voltages of 110V 50 or 60Hz. It has the same physical dimensions, and occupies 2½ relay spaces when rack mounted. Two versions are available, one for 110VAC, and one for 220VAC. The power supply will run two transmitters or a combination of transmitters and receivers drawing a maximum load current of 4.4A. It’s output is in the range of 22.5VDC to 30.5VDC. One power supply unit should not be arranged to feed a transmitter and receiver of the same frequency. A strap adjustment is provided to ensure adequate regulation for two ranges of load: (1)
0.25 Amps to 2.2 Amps.
(2)
2.2 Amps to 4.4 Amps.
A 3 Amp anti-surge fuse must be used on the AC input to the power supply to prevent nuisance blowing due to inrush current at switch on. A suitable fuse is specified in section 7. The circuit for the power supply is shown in Figure 2.6.1.
Green
T5 T0
BN
WAGO 5mm Pluggable 8-Way. Male Panel Mount 8 7 6 5 4 3 2 E 1
BK BN RD OR YW BL GN
P3
T85
T95 RD T105 T115 OR YW BL
t19
t0 SCN VI GN
Red (not used)
D5
WH
1A
D1
GY
R1 3K3 2.5W
10A D4 10A WAGO 5mm Pluggable 8-Way. Female Cable to Male Straight PCB WH GY VI GN GN BK YW
8 7 6 5 4 3 2 1
T5 T0 T85 T95 T105 T115
t21
T1 BK
LED1
10A
D2 10A C1a 10000uF
D3
C1b 10000uF
C1c 10000uF
WAGO 7.5mm Pluggable 9-Way. Male 90Deg PCB 1 2 B24 3 4 5 N24 6 7 2.2-4.4A 8 0.25-2.2A 9 TAP COM P1
V1 130V
P2 V2 275V
Power Supply Circuit Diagram Fig. 2.6.1
M125401A4 Issue 4: October 2011 Confidential and proprietary.
2-5
Section 2 Equipment Note:
2.7
A green LED indication is provided to show that the 24V DC output is energised. It does not indicate that the DC output is within specification since it turns on when the output is above 5V.
B3 4000 / 3000 IMPEDANCE BOND The B3 4000A impedance bond is a ferrite-cored, tuned impedance bond. The B3 4000A is designed to operate at up to 4000A traction return current in AC and DC electrified areas; where the areas are fitted with EBI Track 200 traction immune track circuits. The basic bond can be fitted with one of eight tuning modules (capacitor boxes) so that it can be re-tuned to any of the eight EBI Track 200 operating frequencies.
L
C
Impedance Bond Equivalent Circuit Fig. 2.7 A variant of this impedance bond, the B3 3000A, utilises a different arrangement for terminating the tuning module to the bond coil. This version is intended for the UK market only. 2.8
TEST EQUIPMENT
2.8.1
TI21 Test Meter (TTM) The TI21 Test Meter is designed to measure voltage levels within the individual EBI Track 200 frequency bands. It enables readings of track circuit parameters to be taken without corruption from other track circuit signals or interference at non-EBI track 200 frequencies, e.g. 50 Hz traction return currents. In particular it permits the voltage on a "zero" tuning unit to be measured at one particular frequency without any disconnections being necessary. Its use is recommended for use when working on EBI Track 200 track circuits so as to obtain accurate measurements with minimum disruption of adjacent track circuits, see section 5. Operating instructions for the TTM are given in M6/6/118951.
2.8.2
Rocoil Current Transducer The Rocoil current transducer is designed to connect to the TTM to provide a means of measuring rail currents non-intrusively. The TTM / Rocoil combination is a versatile aid to diagnosing track faults. A description of the Rocoil’s controls is given in section 3.10 and sections 5 and 6 provide further details on its application.
2.8.3
TI21 Shunt Box The TI21 Shunt Box is designed for applying accurate shunt resistance values across the track during setting-up and testing, as described in sections 5 & 6. The shunt box provides shunt value settings from 0 Ω to 9.9Ω, selectable in steps of 0.1Ω.
2-6
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 2 Equipment The unit consists of an aluminium die cast box, two rotary switches for shunt value selection and two insulated, crocodile clip terminated cables for connecting the Shunt Box to the rails. The internal wiring is arranged so that switch contact resistance is kept reasonably constant. Because the internal resistors are of a high rating, the shunt box can remain connected to the rails during shunt testing of EBI Track 200 track circuits. 2.8.4
Sleeper Insulation Tester (SIT) The Sleeper Insulation Tester (SIT) is designed to detect leakage of EBI Track 200 track circuit signals into the sleepers. It provides the operator with an audible and visual indication of leakage level. The SIT allows a specific EBI Track 200 frequency to be checked without interference from any other EBI Track 200 track circuits or any other frequency. The SIT also has an AC detection mode that can be used to detect any AC signal up to approx. 3 kHz; this mode is useful to detect high levels of harmonic leakage in DC 3rd rail, electrified areas. Note that the visual indication is not available to the operator in this mode .
M125401A4 Issue 4: October 2011 Confidential and proprietary.
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Section 2 Equipment
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2-8
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data
Contents 3. 3.1 3.1.1 3.1.2 3.2 3.3 3.4 3.5 3.6 3.7 3.7.1 3.7.2 3.8 3.9 3.10 3.11 3.12
M125401A4 Issue 4: October 2011 Confidential and proprietary.
EBI TRACK 200 TECHNICAL DATA ........................................... 2 General ........................................................................................ 2 System Specification .................................................................... 2 Minimum And Maximum Track Circuit Lengths ........................... 4 Transmitter ................................................................................... 5 Receiver ....................................................................................... 7 Tuning Unit (TU) and End Termination Unit (ETU) ...................... 10 Track Coupling Unit (TCU) ........................................................... 10 EBI Track 200 Power Supply ....................................................... 11 Line Matching Unit (LMU) ............................................................ 13 TX Line Matching Unit ( LMU(TX) ) .............................................. 13 TU / ETU Line MatchIng Unit ( LMU(TU] ) ................................... 14 B3 Bonds for use in AC or DC Electrified Areas .......................... 15 TI21 Test Meter (TTM) ................................................................. 15 Rocoil Current Transducer ........................................................... 16 Sleeper Insulation Tester (SIT) .................................................... 16 Shunt Box ..................................................................................... 16
3-1
Section 3 EBI Track 200 Technical Data
3.
EBI TRACK 200 TECHNICAL DATA
3.1
GENERAL
3.1.1
System Specification
Parameter Power Supply
Balllast Conductance
Value 220 V (nominal) 50Hz or 60Hz AC 110 V (nominal) 50 Hz or 60 Hz AC 24V (nominal) DC Battery 0.5 Siemens/km maximum
Ballast Conductance Change
Ballast conductance must not fall to less than one fifth of its value at the time of track circuit set up
Train Shunt
0.5Ω or less in main part of track circuit 0.15Ω or less throughout tuned area -30ºC to +70ºC Operating
Temperature Range Humidity Resistance Tuned Area Length
ETU / IRJ Position
0% to 100% Relative Humidity 1.0m gauge 22m ±0.5m 1.067m gauge 22m ±0.5m 1.220m gauge 21m ±0.5m 1.435m gauge 20m ±0.5m (Standard gauge) 1.674m gauge 19m ±0.5m Up to 3m
IRJ Stagger
Determination of Circuit Extremity Relays
Defined by centre of the Tuned Area ±5m or position of IRJs Standard Neutral Line Relay from BR930 series or equivalent non-welding safety relay.
Track Feed Voltage
0.8V to 1.8V 4.8V to 8.2V
Track Circuit Frequencies
Nominal 1699 2296 1996 2593 1549 2146 1848 2445 Hz 1 mΩ per connection
Track Connection Resistance Track Connection Current Capability 3-2
A B C D E F G H
TU or ETU TCU
Actual 1682-1716 2279-2313 1979-2013 2576-2610 1532-1566 2129-2163 1831-1865 2428-2462 Hz
System Specification Table 3.1.1 Comments Uses 24V DC Power Supply 220 V version Uses 24V DC Power Supply 110 V version No Power Supply required Ballast conductance above 0.5 Siemen/km may promote nuisance dropping of the track relay, or unsafe set-up conditions. It is very unlikely that the ballast condition will change from one extreme to the other between maintenance checks of the track circuit. If ballast is renewed, then the track must be reset. This is the worst case shunt presented by a train. Track mounted units (TU / ETU) can tolerate a minimum temperature of -40°C. Tuned area length depends on the rail gauge. For rail gauges other than those shown, please contact Bombardier Transportation for details.
ETU rail connections must be placed within 3m of the IRJ defining the end of the track circuit. In the event of staggered joints, this distance refers to the joint nearest the ETU. Note that some rail authorities may have more restrictive conditions. Rail authorities may control the amount of permissible stagger in order to avoid an excessive length of dead section.. An overlap of 2m to 10m will exist in tuned areas, see section 1.2.2. If BR 930 style relays or other non-welding safety relays are not used, then a contact proving arrangement which guarantees detection of welded contacts by the control system must be used. Low Power Normal Power Dependent on frequency and ballast condition A to D are the primary frequencies
E to F are the secondary frequencies
25A minimum 5A minimum M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data Parameter Electromagnetic Compatibility
Value EBI Track 200 track circuits comply with European Directive 89/336/EEC.
Maximum Number of Receivers in a Track Circuit Handling and Storage
3
Comments To achieve compliance, the E terminal on the transmitters, receivers and power supply must be connected to earth. Complex crossings may require more than 3 receivers in a track circuit. In this case, consult Bombardier Transportation for guidance.
There are no special handling requirements Storage temperature limits: -30ºC to +70ºC
M125401A4 Issue 4: October 2011 Confidential and proprietary.
3-3
Section 3 EBI Track 200 Technical Data
3.1.2
Minimum And Maximum Track Circuit Lengths Minimum And Maximum Track Circuit Lengths
MODE
TX-to-Track Distance (m) (see NOTE 5)
Table 3.1.2
Track Circuit Length (m) (see NOTE 2) No Impedance Bonds
One Impedance Bond
Comments
Two Impedance Bonds
Normal Power End fed
< 30
200 to 1100
200 to 1035
200 to 970
Centre fed
< 30
300 to 1000 (each half)
300 to 900 (each half)
300 to 850 (each half)
See sub-section 4.2.3.2
200 to 970
200 to 910
200 to 860
See NOTE 1
See sub-section 4.2.3.4 See NOTE 4
End fed With LMUs
30 to 500
Low Power End fed
End fed With LMUs
< 30
50 to 250
50 to 250
50 to 250
30 to 500
50 to 250
50 to 250
50 to 250 See NOTE 3.
See NOTE 1 & NOTE 4
Single Rail Using Track Coupling Units
200m total Tx + Rx cables
10 to 200
N/A
N/A
Using ETUs
As double rail
20 to 1100 See NOTE 6
N/A
N/A
See manual M580000626A4 See manual M580000626A4
NOTE 1:
This is the preferred method for extending TX-to-TU distance, see sub-section 4.2.6.1.
NOTE 2:
(A)
End fed distances are from the centre point of the TX tuned area to the centre point of the RX tuned area.
(B)
Centre-fed distances are for each half of the track circuit measured between the TX ETU and the centre point of the receive tuned area.
NOTE 3:
To avoid loss of broken rail detection, only two impedance bonds are only allowed in a low power track circuit where they provide traction continuity across IRJs at either end of the track circuit. In this situation it is allowable to use a third bond for traction return to the sub-station, or the traction return conductor may be connected to the centre tap of one of the bonds at the TC joints. In either case only one connection should be taken to the traction return system or for cross-bonding.
NOTE 4:
If ETUs (with IRJs) are fitted at both ends of a low power track circuit, the minimum track circuit length may be reduced to 20 metres.
NOTE 5:
Tx to track distances assume 2.5mm2 cable. The maximum Rx-to-track distance is500m (also in 2.5mm2 cable). See section 4.2.6 for further information.
NOTE 6:
The maximum length of single rail circuits may be limited by traction requirements.
3-4
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data 3.2
TRANSMITTER Supply Voltage Range:
22.5VDC to 30.5VDC
Vibration and Shock Resistance
Complies with EN50125-3 ‘Outside the track’.
Current consumption with TU/ETU On Normal Power: Current consumption with TU/ETU On Low Power: Current consumption with TCU:
2.2A maximum (clear track) over full supply range 0.25A maximum (clear track) over full supply range
Supply Fuse
3A slow blow (see section 7 for part number)
Output power:
Normal Power Mode Low Power Mode Single Rail with TCUs
0.5A maximum (clear track) over full supply range
.
Output stabilisation over maximum variation of supply:
M125401A4 Issue 4: October 2011 Confidential and proprietary.
40W to track (maximum) 3W to track (maximum) 3W to track (maximum)
±5%
Health Monitoring Displays:
Red/Green LED – External Supply Red/Green LED – Internal parameters Red/Green LED – External Load Green In specification Red Out of specification
Modulation rate:
4.8Hz
Connector
Plug-in 9-way WAGO connector.
Unit size :
140 mm H x 142 mm W x 194 mm L (2½ BR relay spaces)
Mounting:
Screw fixings arranged for standard BR relay centres (Ensure that there is at least 10 mm horizontal spacing and 35 mm vertical spacing between units for air circulation). If the unit is fitted in an enclosure, allow 50mm between the connector and the enclosure door for wiring. Rear panel fixing dimensions are identical to the front panel.
Weight:
3kg
3-5
Section 3 EBI Track 200 Technical Data
EBI Track 200 Transmitter Outline:
140
181
57.15 CRS 28.57 CRS 68
B24 N24 MOD
117.45 CRS
M5 RIVET BUSHES. MAXIMUM PROJECTION OF SCREW INTERNALLY 15mm
194
O/P1 O/P2
11.27
57.15 CRS 114.3 CRS 142
Position 1 2 3 4 5 6 7 8 9
3-6
Connector Allocation 9-Way Connector Legend Function B24 Supply positive N24 Supply negative Mod Modulation input Not used OP1 Output Earth Earth terminal symbol OP2 Output Not used Not used
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data 3.3
RECEIVER
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Supply Voltage Range:
22.5VDC to 30.5VDC
Vibration and Shock Resistance
Complies with EN50125-3 ‘Outside the track’.
Current Consumption:
0.3A maximum with relay energised
Relay Output:
42VDC at 50mA maximum (2.1W, suitable for driving a BR 930 series 50V relay). Alternatively, a 20.5VDC output version is available (2.1W, suitable for driving a BR 930 series 24V relay).
Time Delay to operate output relay:
Pick
Maximum Input sensitivity:
15mA
Maximum Input Signal:
4 x threshold level or 500mA whichever is lower.
Frequency Configuration
Defined by removable key
Condition Monitoring Display and Control Buttons
User-interface for frequency configuration and automatic set up when the set-up key is inserted. Readouts of track circuit quantities: o Clear track current o Threshold current o PSU voltage o Relay state o Relay drive voltage and current o Internal temperature o Frequency, Mod state and Serial No
Condition Monitoring Interface
9-way D type connector enabling RS232 or RS485 interface with proprietary monitoring systems. The maximum length of the serial cable is 30m.
Fault Relay Contact Rating
220V DC / 1A.
Connector
Plug-in 9-way WAGO connector.
Unit Size
211mm x 140mm x 142mm with mounting plate.
Mounting – Receiver Unit
Clip-on fixing with integral latch at rear. Front mounting is not possible.
Mounting – Plate
Screw fixing arranged for standard BR relay centres (Ensure that there is at least 35mm vertical spacing between units for air circulation, horizontal spacing is not critical). If the unit is fitted in an enclosure, allow 50mm between the connector and the enclosure door for wiring. Note that a rear connector mounting plate is available for installations where analogue units were frontmounted.
Weight – Receiver Unit
1.3 kg
2 seconds ± 0.5 seconds
3-7
Section 3 EBI Track 200 Technical Data
EBI Track 200 Receiver Outline: 211 181
Front view of Receiver only.
Rear View of Receiver only.
71
EBI Track 200
TI21 Receiver
Next B24
134
OK
N24 TP1
Back
IP C IP 1 IP 2 RL RL E
142 28.57
M5 EXTRUDED & TAPPED HOLES. USE SUPPLIED M5x12mm PAN HEAD POZI/SLOT COMBI HEAD SCREWS.
57.15
EBI Track 200
TI21 Receiver
B24
117.45
140
Next
OK
N24 TP1
Back
IP C IP 1 IP 2 RL RL
11.3
E
16.9
114.3
Mating Connector
Right Angle 3-8
20
Optional Convertor Adapter to Enable Use of Fanning Strip or Spade Crimps
Straight M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data 9-Way Main Connector Allocation Position 1 Top 2 3 4 5 6
7 8 9 Bottom
Legend B24 N24 TP1 IP C IP 1 IP 2
RL+ RLE
Function 24V supply positive 24V supply negative Access to 1Ω Signal input Signal input and access to 1Ω Alternative signal input via 100Ω (not normally used on mainline applications) Relay drive Relay drive Connected to case
9-Way Condition Monitoring Connector Allocation Pin Function Comments 1 RS485 or RS232 select Link to pin 9 for RS485 2 RS232 Tx or RS485 Z 3 RS232 Rx or RS485 A 4 Relay common Fault Relay contact 220V/1A: open = fault. 5 Isolated 0V 6 RS485 Y 7 RS485 B 8 Normally open relay contact Fault Relay contact 220V/1A: open = fault. 9 Isolated 5V supply
M125401A4 Issue 4: October 2011 Confidential and proprietary.
3-9
Section 3 EBI Track 200 Technical Data
3.4
TUNING UNIT (TU) AND END TERMINATION UNIT (ETU) Vibration and Shock Resistance
Complies with EN50125-3 ‘On sleeper’.
Size overall:
375 mm H x 407 mm W x 114 mm L
Maximum rail to rail volts:
110VAC/160VDC
Mounting:
Lineside Stake or Sleeper
Weight:
7.5Kg
Note:
Cables are supplied fitted with crimp terminations but each cable requires a rail termination kit for fixing at the ‘rail end’, see Fig 8.5. A Surge Protected version (SPETU) exists for use in single rail applications, see M58000626A4.
EBI Track 200 Tuning Unit / ETU Outline: 114
335
405
T1 T2
3.5 3-10
140
Terminal Allocation M10 Terminals 2 BA Terminal Block Rail connection 1 RX or TX Low Power (not polarity sensitive) (not polarity sensitive) Rail connection 2 RX or TX Low Power (not polarity sensitive) (not polarity sensitive) 3 Earth terminal 4 TX Normal Power (not polarity sensitive) 5 TX Normal Power (not polarity sensitive) 6 Not connected
TRACK COUPLING UNIT (TCU) M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data For TCU details see Single Rail Applications Manual, M580000626A4. 3.6
EBI TRACK 200 24V DC POWER SUPPLY Vibration and Shock Resistance
Complies with EN50125-3 ‘Outside the track’
Input Nominal 85 – 120V AC version
110VAC 50Hz
190 - 240V AC version
220VAC 50Hz
Input tappings
See below
Input variation
±7% of selected tappings
Input frequency
50/60Hz
Output voltage
22.5 VDC to 30.5VDC smoothed
Output current
0.25A to 2.2A or 2.2A to 4.4A (Range set by output tappings)
Output ripple maximum
3V peak-to-peak at full load current
Peak inrush current at power up
50A. Note that an anti-surge 3 amp fuse must be used in series with the PSU input
Power factor
0.97
Connectors
RH: Plug-in 9-way WAGO connector LH: Plug-in 8-way WAGO connector
Unit size
144 mm H x 146 mm W x 210 mm L (2½ BR relay spaces)
Mounting
Screw fixings arranged for standard BR relay centres (ensure that there is at least 10 mm horizontal spacing and 35 mm vertical spacing between units for air circulation). Rear panel fixing dimensions are identical to the front panel
Weight
5kg
220V Variant Input tappings: Input Voltage 190 V 200 V 210 V 220 V 230 V 240 V
110V Variant Input tappings: Input Voltage 85V 90V 95 V 100 V 105 V 110 V 115 V 120 V
M125401A4 Issue 4: October 2011 Confidential and proprietary.
10-0-190-210-230 V Input Connections between: T0 & T190 T10 & T190 T0 & T210 T10 & T210 T0 & T230 T10 & T230
5-0-95-105-115 V Input Connections between: T0 & T85 T5 & T85 T0 & T95 T5 & T95 T0 & T105 T5 & T105 T0 & T115 T5 & T115
3-11
Section 3 EBI Track 200 Technical Data
Power Supply Outline: 57.15 CRS
M5 RIVET BUSHES. MAXIMUM PROJECTION OF SCREW INTERNALLY 15mm
209 181
28.57 CRS 68
140
117.45 CRS
DC ON T5 T0 T85 T95 T105 T115
B24
N24 2.2A-4.4A 0.25-2.2A TAP COM
M6 EARTH TERMINAL (Transformer Screen & Chassis)
11.27
57.15 CRS 114.3 CRS 142
Note: 110V variant shown. 220V variant identical except input terminals are labelled T10, T0, T190, T210 & T230 instead of T5, T0, T85, T95, T105 & T115.
LH 8-way Connector Allocation EBI Track 200 Position Legend Function 8 Top T5 (T10) 7 T0 (T0) Voltage adjustment 6 T85 (T190) tappings 5 T95 (T210) 4 T105 (T230) 3 T115 2 Not used 1 Bottom Earth Symbol Earth terminal RH 9-way Connector Allocation EBI Track 200 Position Legend 1 Top 2 3 4 5 6 7 8 9 Bottom
3-12
B24 B24 B24 N24 N24 N24 2.2-4.4A 0.25-2.2A TAP COM
Function
24v supply positive output 24v supply positive output 24v supply positive output 24V supply negative output 24V supply negative output 24V supply negative output Output current adjustment tappings
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data 3.7
LINE MATCHING UNIT (LMU)
3.7.1
TX Line Matching Unit ( LMU(TX) ) Vibration and Shock Resistance
Complies with EN50125-3 ‘Outside the track’.
Connector
Plug-in 9-way WAGO connector
Unit size:
140 mm H x 142 mm W x 208 mm L (2½ BR relay spaces)
Mounting:
Screw fixing arranged for standard BR relay centres (Ensure that there is at least 10 mm horizontal spacing and 35 mm vertical spacing between units for air circulation). If the unit is fitted in an enclosure, allow 50mm between the connector and the enclosure door for wiring. Rear panel fixing dimensions are identical to the front panel.
Weight:
2.1 Kg
EBI Track 200 LMU(Tx) Outline: 57.15 CRS
M5 RIVET BUSHES. MAXIMUM PROJECTION OF SCREW INTERNALLY 15mm
209 181
28.57 CRS 68
140
117.45 CRS
TX Line Matching Unit (Tx) TU
M6 EARTH TERMINAL (CHASSIS) 11.27
57.15 CRS 114.3 CRS 142
EBI Track 200 Position 9 Top 8 7 6 5 4 3 2 1 Bottom
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Legend Tx Tx
TU TU Earth Symbol
Function Connects to TX (not polarity sensitive) Not used Connects to TX (not polarity sensitive) Not used Not used Connects to TU/ETU (not polarity sensitive) Not used Connects to TU/ETU (not polarity sensitive) Earth terminal
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Section 3 EBI Track 200 Technical Data
3.7.2
TU / ETU Line MatchIng Unit ( LMU(TU) )
Vibration and Shock Resistance
Complies with EN50125-3 ‘On sleeper’.
Unit size:
75 mm H x 127 mm W x 190 mm L
Mounting:
Screw fixing to backplate, see Fig 8.8
Weight:
2.04 kg including backplate and cover plate
Sketch of LMU(TU) with lid removed to show position of Terminal Block & Terminal Identities.
Ouput Cable Gland ( to TU )
TU
TX E
Input Cable Gland (from Tx )
Position LH Column 1 Top 2 3
3-14
Legend
TU E
LMU (TU) 2BA Terminal Block Function Position Legend RH Column Connect to TU/ETU 4 Top (not polarity sensitive) 5 TX Earth terminal 6 (connects to case)
Function
Not connected Connect to TX (not polarity sensitive)
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 3 EBI Track 200 Technical Data
3.8
B3 BONDS FOR USE IN AC OR DC ELECTRIFIED AREAS B3 Bond variants: B3 3000
Meets BR863 temperature rise limits Capacitor box terminated on busbars outside of main casting Exceeds BR863 temperature rise limits Capacitor box terminated within main casting
B3 4000
Vibration and Shock Resistance
Complies with EN50125-3 ‘On sleeper’.
Unit size (Both variants):
158 mm H x 640 W mm x 459 mm D
Resonated Impedance:
12 Ω minimum. Note: A capacitor box matching the frequency of the track circuit must be fitted to the bond
Traction Resistance:
DC: AC:
< 25 µΩ. < 3 mΩ
Each end to centre tap Each end to centre tap
Traction Current Rating:
Continuous Two Hour Four Minute 100msec 20msec
B3 4000 Per Rail Per Bond 2000ADC 4000ADC 3000ADC 6000ADC 6000ADC 12000ADC 25kA 50kA 50kA 100kA
Out of Balance Current rating:
Track circuit signal voltage attenuation no greater than 5% at the appropriate carrier frequency for an out of balance current of 450A compared to level with no traction current.
Terminations:
Clearance holes for M16 bolts.
Tuning Capacitors (both variants)
Weight:
3.9
B3 3000 Per Rail Per Bond 1500ADC 3000ADC 2250ADC 4500ADC 4500ADC 9000ADC 25kA 50kA 50kA 100kA
Freq A B C D E F G H
Value µF 308.23 ±1.5% 167.22 ±1.5% 222.07 ±1.5% 130.79 ±1.5% 373.41 ±1.5% 191.80 ±1.5% 259.76 ±1.5% 147.29 ±1.5%
71 Kg
TI21 TEST METER (TTM) Refer to the Operating Instructions - M6/6/118951
M125401A4 Issue 4: October 2011 Confidential and proprietary.
3-15
Section 3 EBI Track 200 Technical Data
3.10
ROCOIL CURRENT TRANSDUCER Sensitivity Ranges:
10A/Volt (with 50Hz blocking filter) 1A/Volt (with 50Hz blocking filter) 1A/Volt (without 50Hz blocking filter) 65A peak on 10A/V range 6.5A peak on 1A/V range 2 x PP3 Battery life > 40 hours ‘Power’ LED Indicates steady red when unit powered on Flashes when battery voltage low. Overload LED Indicates red for 2 sec after switch on. Indicates red if current input is overrange. 2 x 4mm sockets OFF, 10A, 1A, 1A (unfiltered)
Current Rating: Batteries: Indicators:
Output Connections: Control / Range Switch:
3.11
SLEEPER INSULATION TESTER (SIT) Refer to the Operating Instructions – M6/6/122940
3.12
3-16
SHUNT BOX Resistance Values:
0 to 9.9Ω in 0.1Ω steps -5% +5% +25mΩ
Power Rating:
15W (continuous use on EBI Track 200)
Cable Length:
1m (each lead)
Dimensions:
171mm wide (excluding cable glands) x 120mm deep x 160mm height (including handle)
Weight:
1.67kg
M125401A4 Issue 4: October 2011 Confidential and proprietary.
Section 4 Track Circuit Designer’s Guide
Contents 4 4.1 4.1.1 4.1.2 4.1.3 4.2 4.2.1 4.2.2 4.2.3 4.2.3.1 4.2.3.2 4.2.3.3 4.2.3.4 4.2.3.5 4.2.3.6 4.2.4 4.2.4.1 4.2.4.2 4.2.4.3 4.2.5 4.2.6 4.2.6.1 4.2.6.2 4.2.7 4.2.7.1 4.2.7.2 4.2.8 4.2.9 4.2.9.1 4.2.9.2 4.2.9.3 4.2.9.4 4.3 4.3.1 4.3.2 4.3.3 4.3.3.1 4.3.3.2 4.3.4 4.3.5 4.3.5.1 4.3.5.2 4.3.5.3 4.3.5.4 4.3.6 4.3.7 4.3.7.1 4.3.7.2 4.3.7.3 4.3.8 4.3.9 4.3.9.1 4.3.9.2 4.3.10 M125401A4 Issue 4: Otober 2011 Confidential and proprietary.
TRACK CIRCUIT DESIGNER’S GUIDE ...................................... 2 Safety Related Application Conditions ......................................... 2 Design .......................................................................................... 2 Installation And Operation ............................................................ 2 Preventative Measures against Bypass Paths ............................ 2 Track Circuit Layout Design ......................................................... 3 Overview ...................................................................................... 3 Frequency Allocation.................................................................... 3 Double Rail Track Circuits ........................................................... 4 End Fed Arrangement .................................................................. 4 Centre Fed Arrangement ............................................................. 5 Jointed Double Rail Operation ..................................................... 6 Low Power Operation................................................................... 7 Minimum Separation Of Units Of The Same Frequency ............. 7 Adjoining Other Types Of Track Circuit Or Adjoining Non-Track Circuited Lines ........................................................... 8 Single Rail Track Circuits ............................................................. 10 Using End Termination Units ....................................................... 11 Using Track Coupling Units ......................................................... 11 Adjoining Other Types Of Track Circuit Or Adjoining Non-Track Circuited Lines ........................................................... 11 Changing Between Single And Double Rail Track Circuits In Electrified Areas ........................................................................... 12 Increasing Feed Lengths / Centralised Operation ....................... 13 Increasing The Tx-To-TU / ETU Distance By Using Line Matching Units ............................................................................. 13 Increasing The Tx-To-TU / ETU Distance By Using Cable With Larger Cross Sectional Area................................................ 14 Points & Crossings ....................................................................... 15 Shunting Considerations .............................................................. 15 Generic Crossing Arrangements.................................................. 15 Electrical Bonding Of Metallic Structures To The Rails ............... 18 Non Standard And Exceptional Situations ................................... 19 Track Circuit Interrupters and Treadles ....................................... 19 Cut Sections ................................................................................. 20 Inserting an Extra Track Circuit .................................................... 20 Track Circuits with steelwork in the bed of the track .................... 20 INSTALLATION REQUIREMENTS ............................................. 21 Overview ...................................................................................... 21 Transmitter and Receiver Mounting ............................................. 21 Rail Connections .......................................................................... 21 Tuning Units (TUs) And End Termination Units (ETUs) .............. 21 Track Coupling Units (TCUs) ....................................................... 22 Cables .......................................................................................... 22 Rail Bonding ................................................................................. 25 Jointed Rail .................................................................................. 25 Traction Return Current Bonding ................................................. 25 Bonding For IRJ Failure Detection ............................................... 26 Check Rails .................................................................................. 26 Lightning Protection (This does not apply to single rail circuits using TCUs) ..................................................................... 27 Power Supply Unit Considerations .............................................. 27 Power Supply Unit Loading Rules ............................................... 27 24V Battery Supplies.................................................................... 28 Power Supply Location ................................................................ 28 EMC Compliance ......................................................................... 28 Fusing - TX, RX and PSU ............................................................ 28 TX and RX B24 ............................................................................ 28 Power Supply Input BX110 or BX220 Circuits: ............................ 29 Torque Settings for EBI Track 200............................................... 30 4-1
Section 4 Track Circuit Designer’s Guide
4
TRACK CIRCUIT DESIGNER’S GUIDE
4.1
SAFETY RELATED APPLICATION CONDITIONS SAFETY REQUIREMENT
4.1.1
The following requirements on design, installation and operation must be observed to guarantee safe operation of EBI Track 200 track circuits.
Design The following design rules must be observed for applications of EBI Track 200 to be adequately safe:
4.1.2
•
The Track Circuit Layout Design section of this manual must be strictly observed.
•
The track relay must be a BR930 style or other non-welding safety relay. AC immune relays are not required provided the relay is housed in the same equipment cabinet as its receiver.
•
Abutting tracks must not be of the same frequency.
•
Tuned Zone length must be in accordance with section 3.1.1.
•
Relay contacts (for example in track circuit interrupters, treadles and cut sections) must not be incorporated into the B24/N24 feeds to transmitters or receivers. This rule ensures that the logging capabilities of the EBI Track 200 are maintained.
Installation And Operation The following application rules must be observed for applications of EBI Track 200 to be adequately safe:
4.1.3
•
The Installation and Set Up and Maintenance sections of this manual must be strictly observed.
•
Any Insulated Rail Joints (not protected by the presence of a diagonal bond) must be subject to regular maintenance checks to ensure their integrity (section 6.2.2 Test R).
•
Rail insulation must be subject to regular maintenance to reduce the likelihood of nuisance failures.
•
EBI Track 200 equipment conforms to the European EMC directive. Other equipment located in the vicinity should be checked for compatibility with EBI Track 200 equipment.
•
If the track bed incorporates steelwork, an assessment of the impact of the steelwork on the track circuit behaviour must be made, see section 4.2.9.4.
Preventative Measures against Bypass Paths The following application rules are used to mitigate the risk of bypass paths arising between transmitters and receivers. • Transmitters and receivers of the same frequency must be fed from separate power supplies, except where battery supplies are used to feed TCU circuits. • All B24 and N24 lines must be earth-free. • PSU, transmitter, receiver and LMU (Tx) cases must be earthed. • Transmitter and receiver to trackside feed cables of the same frequency must be separated as described in section 4.3.3. • Surge arrestors used with TUs/ETUs must have their centre terminal earthed. • Surge arrestors must be regularly tested to ensure that they have not become short circuit to earth (see test Q in section 6.2.2).
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Section 4 Track Circuit Designer’s Guide
4.2
TRACK CIRCUIT LAYOUT DESIGN
4.2.1
Overview In designing a complete track circuit scheme, the designer has to consider the following issues: •
The most applicable and cost-effective track configurations. For example, the use of double rail configuration through points and crossing should be considered as a more efficient alternative to single rail.
•
Suitable equipment location and signal feed arrangements.
•
Frequency allocation.
•
Points and crossings: shunting performance and traction bonding requirements.
•
Interface to non-track circuited lines or other types of track circuit.
•
Considerations where impedance bonds are sited.
•
Site conditions and construction.
•
The uncertainty in definition of the end of a track circuit using tuned zones must be considered where position information is critical to signalling.
EBI Track 200 is designed and has been approved to operate within a set of environmental and physical conditions which are defined in this manual. A number of options allow considerable flexibility for the designer in parameters such as track length, signal cable lengths and equipment positioning. Should either environmental conditions or the basic track circuit limiting conditions required for a specific application be beyond those specified within this manual, please contact Bombardier Transportation for further advice. The following sections define the design issues and options in more detail, particularly where there are interactive or conflicting requirements. 4.2.2
Frequency Allocation Correct allocation of frequencies is critical in jointless applications as tuning units only operate with the correct paired frequencies for which they were designed. Jointed applications offer more flexibility to the designer when it comes to frequency allocation; however it is recommended that the same rules are followed where possible in order to simplify the overall application design. There are eight nominal frequencies of equipment used as four pairs - A/B, C/D, E/F, and G/H. One pair is used per track and the frequencies are alternated, e.g. 'A' track circuit, then 'B' track circuit, then again 'A' track circuit, and so on. Normally, the two frequency pairs A/B and C/D are considered as the primary frequencies for double track lines, while E/F and G/H are used only for situations where there are more than two tracks. This approach results in the following rules to control the risk of induction into parallel track circuits: • Areas of multiple parallel lines, e.g. station areas, three lines should separate the use of the same frequencies • Where parallel lines are spaced vertically, frequencies must be chosen so that no two track circuits of the same frequency are vertically adjacent for any distance exceeding 20m unless the separation is greater than 10m. • Lateral separation of frequencies as shown in Table 4.2.2 and Fig 4.2.2 should be used to ensure that no two track circuits of the same frequency are laterally adjacent.
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Section 4 Track Circuit Designer’s Guide Table 4.2.2 Track
Frequency Letter
Nominal Frequency
Actual Frequency
1
fA
A
1699 Hz
1682 Hz to 1716 Hz
B
2296 Hz
2279 Hz to 2313 Hz
2
C D
1996 Hz 2593 Hz
1979 Hz to 2013 Hz 2576 Hz to 2610 Hz
3
E F
1549 Hz 2146 Hz
1532 Hz to 1566 Hz 2129 Hz to 2163 Hz
4
G H
1848 Hz 2445 Hz
1831 Hz to 1865 Hz 2428 Hz to 2462 Hz
fB
fA
fB
fA
fB
fC
fD
fC
fD
fE
fF
fE
fF
fE
fH
fG
fG
fH
fA
fB
fG fA
fB
fC
fA
fA
fD
fC
fF
fE
fH fB
fB fD fF
fG fA
fA fC fE
fH
fG
fB
fA
indicates limit of track circuit
Frequency Allocation Example 4.2.3
Figure 4.2.2
Double Rail Track Circuits EBI Track 200 is primarily intended for operation as a double rail track circuit, allowing balanced double rail traction current return in either AC or DC electrified areas. Under these conditions all traction return current paths, and any equipotential bonds for safety reasons, are connected to the rails via the centre tap of an impedance bond. In normal plain line track the use of tuned areas means that continuously welded rail is possible. In non-electrified territory EBI Track 200 is often used specifically to allow the use of continuously welded rail. Double rail configuration should also be considered as the most efficient method of track circuiting points and crossings. Sections 4.2.3.1 to 4.2.3.6 describe the equipment configurations required for basic double rail track circuit operation. Maximum and minimum track circuit lengths are given in Table 3.1.2. A low power option is available for short track circuits, see section 4.2.3.4. Typical points and crossings arrangements are discussed in section 4.2.7.
4.2.3.1
End Fed Arrangement The standard configuration for double rail EBI Track 200 applications uses tuned areas for track circuit separation and Tuning Units for coupling the Transmitter and Receiver to the track. This basic configuration is termed ‘End Fed’. A typical end fed arrangement is shown in Figure 4.2.3.1
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Section 4 Track Circuit Designer’s Guide F1 Track Circuit 20m
20m
Tuning Unit F2
Tuning Unit F1
Tuning Unit F1
Tuning Unit F2
Transmitter F1
Receiver F1
Power Supply
Power Supply
Lineside Cubicle
Track Relay
Lineside Cubicle
Standard End Fed Track Configuration (1435mm gauge)
Figure 4.2.3.1
For transmitters operating in normal power mode, ensure that no receiver of an identical frequency is closer than 200 metres (see section 4.2.3.5). 4.2.3.2
Centre Fed Arrangement In order to economise on equipment on long plain track runs, a ‘Centre Fed’ configuration is available. This uses an ETU to transmit the signal into the rails in both directions, and tuned areas (or ETUs) with receivers of the same frequency at either extremity. The two halves of the track circuit function completely independently and may be used as two separate track circuits providing the coarse overlap (see Fig. 4.2.3.2b) does not cause any problem. If both halves are required to work as one track circuit then an extra line circuit must be provided to link the two track relays. It is not necessary for the two sections to be the same length which can be an advantage when planning trackside equipment case locations. Fig. 4.2.3.2a .shows s typical centre fed track circuit arrangement. F1 Track Circuit 20m
Tuning Unit F2
20m
Tuning Unit F1
Receiver F1
Power Supply
Lineside Cubicle
F1a
F1a Track Relay
End Termination Unit F1
F1b
Tuning Unit F1
Tuning Unit F2
Transmitter F1
Receiver F1
Power Supply
Power Supply
Lineside Cubicle
Lineside Cubicle
Centre Fed Track Configuration (1435mm gauge)
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F1b Track Relay
Figure 4.2.3.2a
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Section 4 Track Circuit Designer’s Guide 30m
30m 5m
End Termination Unit
Track Circuit F1a
F1b never shunted
5m
F1b may be shunted
Track Circuit F1b
F1b always shunted
F1a always shunted
F1a may be shunted
F1a never shunted
Overlap Zone at Centre Fed Position (1435mm gauge)
4.2.3.3
Figure 4.2.3.2b
Jointed Double Rail Operation There are various situations where it is not convenient to terminate a double rail track circuit with a tuned area, either at one or both ends. These situations include locations where: • • • •
The 20m length of a tuned area will not fit into the signalling requirements. Precise definition of the track circuit boundary is required. EBI Track 200 abuts a track circuit of a different type. Two EBI Track 200 track circuits of non-paired frequencies abut.
In these circumstances Insulated Rail Joints are normally used to provide track circuit separation. End Termination Units are used to feed and/or terminate the track circuit at one or both ends, depending on requirements. Double rail traction current continuity is provided by the use of B3 impedance bonds (for EBI Track 200 track circuits) fitted either side of the block joints, their centre taps being connected. When EBI Track 200 track circuits adjoin those of a different kind, then an impedance bond suitable for the adjoining track should be used. Figure 4.2.3.3 shows a typical arrangement for jointed double rail operation. F1 Track Circuit
Insulated Rail Joint
End Termination Unit F2
B3 BOND
B3 BOND
End Termination Unit F1
End Termination Unit F1
Transmitter F1
Receiver F1
Power Supply
Power Supply
Lineside Cubicle
Jointed Double Rail Operation
B3 BOND
B3 BOND
End Termination Unit F2
Track Relay
Lineside Cubicle
Figure 4.2.3.3
ETU / B3 Bond Connections Where ETUs are installed close to B3 Bonds, it is recommended that the ETU to track connection is made to the capacitor connection stud on the B3 Bond. This has the advantage of providing detection of loss of a B3 Bond sidelead connection.
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Section 4 Track Circuit Designer’s Guide ETU / IRJ Position ETU rail connections must be placed within 3m of the IRJ defining the end of the track circuit. In the event of staggered joints, this distance refers to the joint nearest the ETU. Note that some rail authorities may have more restrictive conditions. IRJ Stagger Rail authorities may control the amount of permissible stagger in order to avoid an excessive length of dead section.
4.2.3.4
Low Power Operation Low power operation is used on short track circuits in the range of 50 to 250 metres long, and facilitates easy adjustment of the receiver by the use of reduced rail voltages. Normal Power circuits are permitted for track circuits in the range over 200 metres long In design, it is recommended that track circuits below 250m are specified as Low Power and the overlap between the lengths for low and normal power of 200m – 250m is used to deal with specific site conditions during commissioning. Low power operation is available simply by driving a transmitter into tuning unit terminals 1 and 2 (normally the receiver terminals) instead of terminals 4 and 5. This connection gives a track drive voltage of approximately 25% of the normal without any other significant alteration to the functional performance of the track circuit. For transmitters operating in low power mode, ensure that no receiver of an identical frequency is closer than 50 metres (see section 4.2.3.5). A special engraved insulated label is available for fitting to terminals 4 and 5 of the transmitter and receiver tuning units as a reminder that the track circuit is connected in low power mode (see section 7 for the part number of this label). It is recommended that track circuit identity labelling in the equipment cabinet or equipment room should include the legend ‘Low Power’.
WARNING LOW POWER T.C. CONNECT Tx CABLES TO 1 & 2
Low Power Label: 510/5222DA4
4.2.3.5
Figure 4.2.3.4
. Minimum Separation Of Units Of The Same Frequency For transmitters operating in normal power mode, ensure that NO receiver of an identical frequency (of a different track circuit) is closer than 200 metres on the same track. For transmitters operating in low power mode, ensure that NO receiver of an identical frequency (of a different track circuit) is closer than 50 metres on the same track. These minimum lengths are specified to ensure that, in the event that a tuning unit becomes disconnected or open circuit, a transmitter cannot falsely feed another receiver on the same line. They ensure that there is sufficient margin of safety provided by the impedance of the intervening rails. This precaution is in addition to the protection provided by the fact that the loss of a tuning unit will be detected because the associated track circuit will de-energise. The following sketches show typical layouts which can be used to maintain minimum separation of units of the same frequency.
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Section 4 Track Circuit Designer’s Guide Normal Power 200m - 1100m
TC 1 fA
Low Power 50m min.
TC 2 fB TX NP
Normal Power 200m - 1100m
TC 3 fA
RX
TX NP
TC 4 fB
RX
TX LP
TC 5 fA
TX NP
RX
RX
Adjacent TC4 has TX & RX positions transposed so that TC4 RX is not within 200m of the same frequency normal power TX of TC2
TX/RX transposition to prevent a RX being within 200m of same frequency normal power TX Normal Power 200m - 1100m
Low Power 200m - 250m
Low Power 50m min.
TC 1 fA
TC 2 fB
TC 3 fA
TX NP
RX
TX LP TC2 must also be at least 200m long to maintain separation between normal power fA TX of TC1 & RX of TC3
RX
Normal Power 200m - 1100m
TC 4 fB TX LP
TC 5 fA
RX
TX NP
RX
Adjacent TC2 has to be converted to low power because its TX is within 200m of same frequency RX of TC4.
Use of second low power TX where transposition shown in Fig 4.2.3.5a is not possible
4.2.3.6
Figure 4.2.3.5a
Figure 4.2.3.5b
Adjoining Other Types Of Track Circuit Or Adjoining Non-Track Circuited Lines Where double rail EBI Track 200 track circuits have to adjoin non track circuited line, the easiest solution is to use a Tuning Unit and a cable strap as shown in Figure 4.2.3.6a. This solution avoids having to insert insulated block joints and, in electrified areas, includes a low cost traction bond across the rails. The spacing of the cable strap from the Tuning Unit depends on the rail gauge: 1.0m gauge 21.5m ±0.5m 1.067m gauge 21m ±0.5m 1.220m gauge 20m ±0.5m 1.453m gauge 18.5m ±0.5m 1.674m gauge 18m ±0.5m 18.5m
Track Circuit Frequency F1
Track Circuit length measured from centre of remote Tuned Area to this position
Tuning Unit Frequency F1
19/1.53 (35mm²) Copper Cable (Or traction rated in electrified areas)
No Track Circuit Equipment
10m
EBI Track 200 adjoining non-track circuited areas without the use of insulated block joints (1435mm gauge) Figure 4.2.3.6a
If two EBI Track 200 track circuits of non-paired frequencies have to be joined, and double rail track circuit operation and traction return are to be maintained, then the arrangement 4-8
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Section 4 Track Circuit Designer’s Guide shown in Figure 4.2.3.6b should be adopted. Each bond is resonated to the frequency of the track circuit it is in by means of the appropriate tuning module. Failure of either block joint should be detected by the loads reflected across the impedance bonds by autotransformer action in each direction. These should be sufficient to drop both track circuits. Rail connections to be within 3m of the IRJ 3m
3m
IRJ
Track Circuit Frequency F1
End Termination Unit Frequency F1
B3 Bond
End Termination Unit Frequency F2
B3 Bond
Track Circuit Frequency F2
IRJ
NOTE:
Frequencies F1 and F2 can be any non-paired TI frequencies, but must not be the same.
EBI Track 200 adjoining a non-paired frequency Double rail track circuits and traction return
Figure 4.2.3.6b
Where EBI Track 200 track circuits have to abut track circuits of a type other than EBI Track 200, care must be taken to confirm that there is no possibility of the EBI Track 200 carrier signal energising the receiver of the adjoining track circuit, or vice versa, especially in the presence of block joint failures if these are not detectable. Certain types of track circuit use similar carrier frequencies and modulation schemes, so careful design of the interface is essential. There is also a danger that one EBI Track 200 track may feed through an intervening non-EBI Track 200 track to falsely energise another EBI Track 200 track if there is a multiple failure of IRJs. In many instances an EBI Track 200 impedance bond installed on the EBI Track 200 track close to the IRJs will detect their failure by shunting the adjacent non- EBI Track 200 track. Otherwise the type of non- EBI Track 200 track to be used must be chosen to avoid this danger. Bombardier Transportation will be pleased to advise further on solutions to this problem. Figures 4.2.3.6c and d give suggested arrangements for double rail EBI Track 200 track circuits adjoining both double and single rail track circuits of different types.
Rail connections must be within 3m of the IRJ
IRJ
Track Circuit Frequency F1
End Termination Unit Frequency F1
B3 Bond
Other T.C. Bond
Other T.C. Tx / Rx
Other Double Rail Track Circuit
IRJ
EBI Track 200 adjoining a double rail track circuit of a type other than EBI Track 200
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Figure 4.2.3.6c
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Section 4 Track Circuit Designer’s Guide Rail connections must be within 3m of the IRJ
IRJ
Track Circuit Frequency F1
End Termination Unit Frequency F1
Other T.C. Tx / Rx
B3 Bond
Other Single Rail Track Circuit
IRJ
EBI Track 200 adjoining a single rail track circuit of a type other than EBI Track 200 4.2.4
c Figure 4.2.3.6d
Single Rail Track Circuits Due to its traction current immunity, EBI Track 200 is also suitable for operation as a single rail track circuit, allowing imbalanced traction current return in either AC or DC electrified areas. Under these conditions all traction return current paths, and any equipotential bonds for safety reasons, are connected to the rail allocated as the traction return or common rail. The other rail is used solely for track circuiting purposes, and is periodically isolated with insulated rail joints for this purpose. Impedance bonds are not used. In many cases insulated rail joints are positioned in both rails, and the common rail is swapped from one side to the other by means of a traction bond connected diagonally across the joints (See Figure 4.2.4.1). In this way failure of an insulated block joint is always detected by the bond presenting a dead short across one of the two track circuits associated with the joint. It must be noted that broken rail detection cannot be guaranteed for the traction return (or common) rail when EBI Track 200 is used in single rail mode, and that certain other conditions apply in order to guarantee shunt detection under fault conditions (i.e. in the presence of a broken rail). These conditions are given in the single rail manual M580000626A4. Sections 4.2.4.1 to 4.2.4.2 describe the equipment configurations required for basic single rail track circuit operation.
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Section 4 Track Circuit Designer’s Guide 4.2.4.1
Using End Termination Units The use of End Termination Units (ETUs) allows track circuits in an ‘End Fed’ configuration with lengths of between 50m and 250m in low power mode, or 200m to 1100m in normal power mode. There are restrictions to the number of traction return connections that can be made within any single track circuit, and there are more restrictive length limits if overhead line equipment gantries are connected directly to the rail (see section 4.2.8). Only one traction return or track cross bond connection is allowed within any single track circuit. This does not include the diagonal traction bond across double insulated block joints, if used. F1 Track Circuit
End Termination Unit F2
End Termination Unit F1
End Termination Unit F1
End Termination Unit F2
Transmitter F1
Receiver F1
Power Supply
Power Supply
Lineside Cubicle
Lineside Cubicle
Standard Single Rail End Fed Configuration
4.2.4.2
Track Relay
Figure 4.2.4.1
Using Track Coupling Units Track Coupling Units (TCUs) provide a lower cost method of implementing single rail track circuits which has the advantage of not requiring equipment immediately beside the track. For details, see Single Rail Applications Manual, M580000626A4.
4.2.4.3
Adjoining Other Types Of Track Circuit Or Adjoining Non-Track Circuited Lines Where single rail EBI Track 200 track circuits have to adjoin non track circuited line insulated block joints are normally used as shown in Figure 4.2.4.3a. The block joint avoids the EBI Track 200 signal travelling in the wrong direction, into the non-track circuited area. Less than 3m IRJ
Track Circuit Frequency F1
End Termination Unit Frequency F1
OR
No Track Circuit Equipment
IRJ
NOTE:
If precautions are required to protect against the consequences of IRJ failure, then a possible solution would be to fit a bond as indicated by the dotted lines. Any bond fitted must be traction rated in electrified areas.
Single Rail EBI Track 200 Track Circuit Adjoining Non Track Circuited Areas
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Figure 4.2.4.3a
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Section 4 Track Circuit Designer’s Guide If two single rail EBI Track 200 track circuits of non-paired frequencies have to be joined, then the arrangement shown in Figure 4.2.4.3b should be adopted. Failure of either block joint is detected by the diagonal bond presenting a short circuit across one of the track circuits. Less than 3m
Less than 3m
IRJ
Track Circuit Frequency F1
End Termination Unit Frequency F1
End Termination Unit Frequency F2
Track Circuit Frequency F2
IRJ
NOTE:
Frequencies F1 and F2 can be any non-paired TI frequencies, but must not be the same. Bond must be traction current rated in electrified areas.
EBI Track 200 Single Rail Track Circuit Adjoining Non Paired Frequency EBI Track 200 Track Circuit
Figure 4.2.4.3b
Where EBI Track 200 track circuits have to abut track circuits of a type other than EBI Track 200, care must be taken to confirm that there is no possibility of the EBI Track 200 carrier signal energising the receiver of the adjoining track circuit, or vice versa, especially in the presence of block joint failures if these are not detectable. Certain types of track circuit use similar carrier frequencies and modulation schemes, so careful design of the interface is essential. There is also a danger that one EBI Track 200 track may feed through an intervening non- EBI Track 200 track to falsely energise another EBI Track 200 track if there is a multiple failure of IRJs. Normally a cable bond installed diagonally across the IRJs will detect their failure by shunting either the EBI Track 200 or the adjacent non-EBI Track 200 track. Otherwise the type of EBI Track 200 track to be used must be chosen to avoid this danger. Bombardier Transportation will be pleased to advise further on solutions to this problem. Figures 4.2.4.3c gives a suggested arrangement for single rail EBI Track 200 track circuits adjoining single rail track circuits of a different type. Note that the second IRJ and transposition bond may not be required for certain track circuit types; therefore it is recommended that local railway authority rules are consulted. Less than 3m
IRJ
Track Circuit Frequency F1
End Termination Unit Frequency F1
Other T.C. Tx / Rx
Other Single Rail Track Circuit
IRJ
NOTE:
Bond must be traction current rated in electrified areas.
EBI Track 200 Single Rail Track Circuit Adjoining Single Rail Track Circuit Of Another Type
4.2.5
Figure 4.2.4.3c
Changing Between Single And Double Rail Track Circuits In Electrified Areas In some schemes there is a need to change between double and single rail track circuits. An example of this is schemes where plain line tracks are double rail, but single rail track circuits and traction return is used in points and crossings areas. In these circumstances it is important that the transition between the two traction return styles is done correctly, otherwise imbalanced traction currents in the double rail area can saturate impedance bonds and cause track circuit unreliability.
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Section 4 Track Circuit Designer’s Guide Figure 4.2.5 shows how an impedance bond is used to make the transition between single and double rail track circuits without causing traction current imbalance. Rail connections to be within 3m of the IRJ
IRJ
Track Circuit Frequency F1
End Termination Unit Frequency F1
End Termination Unit Frequency F2
B3 Bond
Track Circuit Frequency F2
IRJ
NOTE:
Normally frequencies F1 and F2 would continue the paired sequence if the transition is in the normal route in points, or be non-paired frequencies if the transition is in the reverse route.
Transition From Double To Single Rail EBI Track 200 Track Circuit 4.2.6
Figure 4.2.5
Increasing Feed Lengths / Centralised Operation The normal method of connection between the Transmitter or Receiver and the Tuning Unit (TU) or End Termination Unit (ETU) is using 2.5mm2 (50/0.25mm) twisted pair wire. Under these conditions the loop resistance of the wire in the transmitter circuit must be limited to 0.5Ω maximum, which limits the length to 30m. Because of the impact on the source impedance of the TU/ETU, increasing the Tx to TU/ETU feed cable resistance above the nominal 0.5Ω is not normally recommended.. Longer feed lengths for the transmitter may be possible depending on cable type, track circuit length and rail authority regulations. The loop resistance of the wire in the receiver circuit is much less critical, and feed lengths of up to 500m can be used without special precautions. On some installations, the required distance between the Transmitter and its associated TU or ETU exceeds the distance allowed by the normal equipment arrangement. In such cases the Tx-to-TU / ETU distance may be increased by adopting one of two methods, given in order of preference. (1)
Use Line Matching Units to increase the Tx-to-TU / ETU distance to up to 500m..
(2)
Use a cable with a larger cross sectional area to maintain a loop resistance of no greater than 0.5Ω
The following sections provide more detail on each of these methods. 4.2.6.1
Increasing The Tx-To-TU / ETU Distance By Using Line Matching Units The maximum length of the Transmitter to TU / ETU cable can be extended up to 500m by fitting Line Matching Units between the Transmitter and TU / ETU without any special precautions other than a reduction in the maximum track length to 970m. Longer feed lengths for both transmitter and receiver may be possible depending on cable type, track circuit length and rail authority regulations, please consult Application Note IS580018381A4 for details. The LMU consists of two units: Line Matching Unit (TX) - fitted next to its associated EBI Track 200 transmitter. Line Matching Unit (TU) - fitted adjacent to the associated TU / ETU. The general equipment layout for the use of LMUs is shown in Figure 4.2.6.1.
M125401A4 Issue 4: Otober 2011 Confidential and proprietary.
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Section 4 Track Circuit Designer’s Guide F1 Track Circuit
Tuned Area
Tuned Area
Tuning Unit F2
Tuning Unit F1
Tuning Unit F1
LMU (TU)
Up to 500m
Power Supply
Transmitter F1
Tuning Unit F2
Up to 500m
LMU (Tx)
Track Relay
Receiver F1
Power Supply
Equipment Room
Standard Remote Fed Track Configuration With LMUs
Figure 4.2.6.1
Ref
Application Rules for LMUs
1
Since the normal maximum distance between LMUs is limited to 500m, induced voltages from OHLE are kept to safe levels and there is no need for restrictions on running parallel to OHLE. Additional restrictions relating to induced voltages may be required if longer lengths are used.
2
Because of the long feed length and high voltage, 50/0.25 twisted pair or screened twisted pair cable shall be used between the LMU units in order to minimise cross-talk. See also rules regarding runs in the same troughing or cable hangers in section 4.3.4.
3
LMU(Tx) or LMU (TU) may be positioned up to a total (for both units) of 5m from the Tx or TU/ETU that they connect to. This rule permits flexibility where there are space constraints on mounting the LMUs. Table 4.3.1.1: Application Rules for LMUs
4.2.6.2
Increasing The Tx-To-TU / ETU Distance By Using Cable With Larger Cross Sectional Area This method is intended for relatively small increases in distance; if this requirement exists, then a cable with cross sectional area greater than the standard 2.5mm2 should be used. The cable size should be chosen to maintain the total loop resistance in the Tx-to TU / ETU circuit of 0.5Ω or less. The Rx-to-TU / ETU cable length is unaffected..
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M125401A4 Issue 4: Otober 2011 Confidential and proprietary.
Section 4 Track Circuit Designer’s Guide 4.2.7
Points & Crossings
4.2.7.1
Shunting Considerations EBI Track 200 may be used through points and crossings, but consideration must be given to obtaining acceptable shunting throughout the track circuit. In electrified areas, since cross bonding has to be used at IRJs to enable traction current continuity, consideration must be given to the consequent ‘feed around’ paths that these bonds may create. No more than 3 receivers should be used in a track circuit. If a complex crossover requires more than this, please consult Bombardier Transportation for guidance. ETU / IRJ Position ETU rail connections must be placed within 3m of the IRJ defining the end of the track circuit. In the event of staggered joints, this distance refers to the joint nearest the ETU. Note that some rail authorities may have more restrictive conditions.
4.2.7.2
Generic Crossing Arrangements Points and crossings can be divided into three generic types which are described below. If further assistance is needed for a specific application, please contact Bombardier Transportation. It should be noted that the double rail, jointless configuration generally provides the most cost-effective solution. (1) Single Turnout of Less than 20 metres1 The following sketch shows a typical EBI Track 200 arrangement at a single turnout of less than 20 m length. Bonding is arranged for full double rail track circuit operation and traction return. TRACK CIRCUIT 1
TU Frequency 2
TU Frequency 1
TU Frequency 1
TU Frequency 2
[A]
m
Rx F1
0