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 G2 of 3 5 IRJ Inspection 6 Performance Test <strong>General</strong> <strong>Information</strong> on Track Circuits 5.1 Testing of IRJs IRJs should be visually checked for indications of insulation deterioration, general condition and rail burring over the insulation. If an IRJ is suspect, a possession of the track circuits concerned should be obtained and the IRJ tested for insulation break–down with the track circuits taken out of service. The metallic components of the IRJ being tested should be cleaned to allow a good electrical contact with the test leads. If the insulation resistance between either plate and rail is less than 2kΩ at 50V, thew joint is likely to fail or has partially failed and requires attention. The Engineering Supervisor should be notified so that arrangements can be made with the Permanent Way Engineer to replace the faulty IRJ. In the case of d.c. track circuits, IRJ’s may be tested with the track circuits in service under certain conditions. This procedure is described in GK/RC0755 Part F. 5.2 Prefabricated IRJs Edilon and similar prefabricated IRJs must be tested with a 50V insulation tester prior to installation in the track, taking care that the IRJ assembly is not in contact with any conducting surface. Test: Withdrawn Document Uncontrolled When Printed a) Between the two rails. b) Between both fishplates and the two rails. c) Between each bolt and the two rails. The minimum acceptable reading is 500kΩ.. a) The track circuit should be energised and adjusted in accordance with the relevant section in this handbook. If difficulties are experienced, refer to the Fault Finding Procedures. b) Ensure that the polarity/phase is correct and that the correct electrical stagger is achieved. c) Track circuit interrupters must be tested by disconnection. d) Ensure that all adjoining track circuits are energised. Remove the feed links of the track circuit under test to check that only the correct track relay or relays respond. Check that any remaining extraneous voltage on the track relay does not exceed that permitted for the particular track circuit design (see the Testing & Commissioning Part in the Code of Practice for the relevant track circuit). e) Set the shunt box to the minimum permitted drop shunt value, and apply sequentially at all extremities and at selected places within any S & C, to prove the functionality of the track circuit bonding; the correct track relay must be seen to drop each time. For jointless track circuits, prove that the theoretical extremities are the actual extremities. G2 R A I L T R A C K
Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page G3 of 3 f) Carry out a correspondence test between the rails of each track circuit and any indications or to the final TPR, where no indications are provided. A track circuit must not be commissioned until the person in charge of S&T work is satisfied that the rail surface is sufficiently free of rust and other contamination to ensure correct shunting. R A I L T R A C K G3
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