VRIOGS 010.7 RevA - Public Transport Victoria

18 VRIOGS 010.7 Revision AMinimum main-linerail weightAverage distancebetween cross-bondlocations (betweensubstations)Maximum distancebetween any two crossbond locations47 kg/m 1600 m 1900 m53 kg/m 1800 m 2100 m60 kg/m 2000 m 2400 mTable 4 Distance between cross bonds where substations are less than 5.0 km apartb. Between any two substations separated by more than 5.0 km, theaverage and maximum distances between cross bond locations mustnot exceed the values given in the following table:Minimum main-linerail weightAverage distancebetween cross-bondlocations (betweensubstations)Maximum distancebetween any two crossbond locations47 kg/m 1300 m 1500 m53 kg/m 1500 m 1800 m60 kg/m 1600 m 1900 mTable 5 Distance between cross bonds where substations are greater than 5.0 kmapart6.4.1 Double Rail AC Track Circuits1. There shall be no more than one cross bond connection in any track circuit.2. Where IRJs are in use, the cross bond is made between the neutral points ofthe impedance bonds at the end of the track circuits. In some cases wherethe type of track circuit permits it, an additional impedance bond can be fittedmid track circuit for the purpose of tying-in to a parallel track.6.4.2 Single Rail AC Track Circuits1. Single rail track circuits provide a reduced rail cross section for the returntraction current path, with consequent increased traction return resistance.2. Parallel traction rails shall be bonded together by appropriately rated tractioncables, to form a common traction return ‘grid’. Cross bonding may alsoinclude connections to sidings or impedance bond neutral points on adjacentdouble-rail track circuits.3. A minimum of one cross-bond location must be located in any single-rail trackcircuit region.NOTE: This document is controlled only when viewed on the DOT Engineering Standards website.Any other copy of this document is uncontrolled, and the content may not be current.