General Information on Track Circuits - RGS Online

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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page D4 of 20 Type Suitable For Lightly Used Lines D.C. Medium Voltage A.C. Immune #1 <strong>General</strong> <strong>Information</strong> on Track Circuits IRJs Required Immunity From Suitable For S & C a.c. 50Hz d.c. Yes Yes Yes No Yes D.C. Diode #1 Yes Yes No No No TI21 #1 No No Yes#4 Yes No HVI #1 Yes Yes Yes Yes Yes D.C. Low Voltage Plain No Yes No No Yes D.C. Low Voltage A.C. Immune D.C. Medium Voltage Plain D.C. Medium Voltage A.C. Immune/D.C. Tolerant A.C. WR Quick Release Withdrawn Document Uncontrolled When Printed No Yes Yes No Yes Yes Yes No No Yes Yes Yes Yes Yes#2 Yes No Yes No No Yes A.C. 50Hz Vane No Yes No Yes Yes#3 A.C. 83.3Hz Vane No Yes Yes Yes Yes#3 Reed No Yes Yes Yes Yes Aster/SF15 No No No No No Notes: # 1 Preferred track circuits for new works. # 2 Limited dc immunity. Used in an area of ac lines close to ac/dc dual lines not fitted with any means of isolating the traction rail systems. Use must be subject to a proper immunisation evaluation exercise. # 3 Single rail type has restricted length but adequate for S & C application. Double rail type is difficult in complex S & C but permits long length in plain line. # 4 The use of TI21 on ac electrified lines requires the earthing of lineside structures to be to a separate conductor rather than to the rail. This precludes the use of TI21 on ac lines unless part of a major new electrification scheme. Figure D1 D4 RAILTRACK
<strong>General</strong> <strong>Information</strong> on Track Circuits 5 Cut Sections Withdrawn Document Uncontrolled When Printed Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page D5 of 20 Designing cut sections into a track circuit is a method of reducing the continuous length. The track circuit is split into individual track circuits, each one controlling the same final TPR. They are indicated as one track circuit on the signalman’s panel. Special care must be taken where an individual section of such a track circuit is used separately for control purposes (eg. level crossing timing). The cascading of cut sections (ie. controlling the feed to a track circuit by the relay of the next track circuit) is not permitted. The individual cut sections should be either returned individually to the interlocking or summated in the TPR lineside circuit or, in the case of SSI, summated in the data. Cut sections must be identified in accordance with GK/RT0009 (ie. AA1, AA2, AA3, etc) in the direction of normal running. The two portions of a centre fed jointless track circuit are treated separately for this purpose (eg. AA2 and AA3 in Figure D2). Figure D2 (50HZ) Track Circuit AA1 AA2 AA3 AB Relay Feed (Centre Fed) Jointless Track Circuit AA2 AA3 AB RX AA2/3 TX RX RX Where a monitoring device is provided, it must indicate to the technician the location at which the failed relay/receiver is housed, irrespective of the line affected. With reference to Figure D3, an example of the labelling for an individual display would be “Loc 10 (AA2, AA3, BC2, BC3)”. AA2 BC3 Figure D3 AA2 AA3 RX RX AA3/4 AA4 TX RX AA3 AA4 BC2 BC1 BC3 BC2 BC1/2 BC1 BB6 RX RX TX RX RX LOC. 10 LOC. 11 LOC. 12 Track circuits must not consist of more than two non–monitored cut sections (where track circuits are centre fed, four receivers (Rxs) may be non– monitored). RAILTRACK D5 AB1 TR AB1 BB6
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General Information on Track Circuits - RGS Online

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