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of Practice GK/RC0752 Issue Two Date December 1998 Page E24 of 52 13 High Voltages 14 Lineside Apparatus Housing Wiring Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits Fix warning signs (Figure E21) to all exposed track circuit capacitors and to the outside of lineside apparatus housings containing high voltage track circuit equipment. Catalogue numbers are as follows: Description Catalogue No. Safety sign, yellow triangle “caution risk of electric shock”, 50mm wide : 56/144135 Safety sign, yellow triangle “caution risk of electric shock”, 100mm wide : 56/144111 Safety sign, yellow triangle “caution risk of electric shock”, 150mm wide : 56/144130 Safety sign, yellow triangle “caution risk of electric shock” plastic laminate 300mm x 300mm : 56/144611 Figure E21 For general wiring procedures the appropriate Code of Practice should be consulted. Refer to Codes of Practice within the Track Circuit Handbook for special cases. 14.1 Protection of Terminals Terminals in lineside apparatus housings, dis. boxes, etc and impedance bond terminal boxes should be corrosion proofed using Valvoline Tectyl 506 (Catalogue No. 7/58553) as soon as wiring and testing are complete. Valvoline should not be applied to capacitor adjusting slides, fuse clips or end caps, or the windings of wire–wound resistors. E 24 R A I L T R A C K
<strong>General</strong> <strong>Information</strong> on Track Circuits 15 Impedance Bonds Manufacturer Style Freq. (Hz) Howells or WBS Howells or WBS Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E25 of 52 15.1 Handling Precautions When transporting impedance bonds, they should be lifted only by the lifting lugs or at the defined lifting points. Under no circumstances should any weight be taken on the traction lead terminals or cable lugs as this can result in damage to the insulation, allowing water to enter. Type 3 impedance bonds have positions for lifting lugs to be fitted, which should be removed as soon as the impedance bond has been placed in the track and replaced with the supplied means of protecting the threads. 15.2 Impedance Bond Types and Restrictions Refer to the table in Figure E22 Function Type Cat No Oil Filled Aux. Coil Ratio Weight (Kg) Supply WH3 50 Universal 3 86/17024 No 56: 1 160 N MR or S 50 Universal 2 86/17023 No 56:1 160 O WBS P3 50 Universal 1 88/1237 Yes 45:1 S SGE DE 50 Universal I 88/83945 Yes 40:1 120 S WBS M 50/75 Specific 0 Yes 42:1 230 O WBS M2/5 50/75 Specific* 0 88/83948 Yes 42:1 190 S WBS M650/ 75 Withdrawn Document Uncontrolled When Printed Specific 0 88/83952 Yes 45:1 230 O SGE DD 50 Universal 0 Yes 42:1 230 O GRS B 50 Specific 0 Yes 45:1 O Figure E22 The table in Figure E22 is interpreted as follows: Function Universal Impedance bonds shown as ”Universal” may be used for all functions in all styles of track circuit approved for use in d.c. electric traction areas, subject only to their ability to cope with the designed traction current load. Note: Saturation levels and avoidance of particular combinations of bond and track relay, should be considered when replacing bonds of one style with another (see Clause 15.4). The impedance bonds are tuned to 50Hz. For other frequencies, internal resonating capacitors are fitted. Specific Impedance bonds shown as ”Specific” are specially set or tuned to perform feed, relay or intermediate functions at a particular frequency. If, in an emergency, an impedance bond is required to perform a different function or operate at the other frequency, it should be re–tuned. R A I L T R A C K E 25
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