VRIOGS 010.3 RevA - Public Transport Victoria

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20 VRIOGS 010.3 Revision A8.3.4.5As permitted by AS 3000 and AS 3008.1, cable de-rating factors shall be applied sothat the grouping, spacing, enclosure and location of cables are taken into account.The specifications of the cables shall be specified such that the current rating of theconductors after appropriate de-rating factors have been applied is not less than thespecified rating of the circuit breaker or fuse that protects the conductor.8.3.4.6For new substations insulated cabling shall be used between switchgear. The cableshall be placed in ducting, conduit or cable tray depending on the best designsolution that provides safety to personnel, cost efficiency, efficient use of space andmaintainability. Cable trays shall be free of sharp edges in order to prevent damageto cable sheaths.8.3.4.7Cabling from any outdoor switchgear to an indoor switchroom shall also useunderground cabling.8.4 FAULT PROTECTION – EQUIPMENT AND SETTINGSThe specifications for protection equipment will be provided by the Department, afterit has evaluated system parameters and requirements. The Department shall beconsulted by the designer in order to obtain the specifications required of the faultprotection equipment to be selected.8.5 ELECTROLYSIS MITIGATION8.5.1 BACKGROUNDIn brief, electrolysis is the process by which underground pipes, cables and othermetallic structures are corroded by electric currents.Electrified railways in Victoria are operated on direct current with the overheadcontact wire at positive potential and rails at negative potential. The rails are notdirectly earthed.Not all return negative current flows through the rails, as some current leaks off viathe rail fastenings, through the sleepers and ballast into the ground. In the ground itmay enter insulated pipes, cable sheaths and similar underground metallic structuresand flows towards the substation. At some point that current leaves the undergroundstructures and returns to the rails and back to the substation negative bus bar.Corrosion is likely to occur where the current leaves the underground structures toreturn to rail.The loss from pipes and cable sheaths is confined to small areas which quicklybecome perforated to the detriment of the pipe or cable.Tests shall be conducted by the Departments Representative on the in-servicesubstation to determine the active electrolysis conditions and whether there is a needfor Electrolysis Mitigation Equipment.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.
VRIOGS 010.3 Revision A 21The designer shall however make provision for the future installation of ElectrolysisMitigation Equipment in the design.8.5.2 ELECTROLYSIS MITIGATION CUBICLEThe Electrolysis Mitigation Cubicle is designed and installed by one of theDepartment’s Representatives. To enable the installation of electrolysis mitigationequipment in the Substation, the designer shall make the following provisions in thedesign.a) Provision for freestanding type cubicle with minimum internal dimensions of1000mm wide, 800mm deep and 2000mm high. The cubicle will have frontaccess by a full height door. The designer shall obtain the most currentdrawing for this cubicle from the Department.b) The cubicle shall be located either in the HV switch room or in the amenitiesarea. As the Electrolysis Mitigation Equipment is not normally serviced by theSubstation staff of the Department, it shall be located in an area well clear ofoperational HV equipment.c) 32A, 240-230 volt AC power supply from MCCB F438 and F439 onswitchboard shall be provided in the design.d) Provisions shall be made for SCADA control and indication of the ElectrolysisMitigation Equipment.e) Connection of potential leads to the shunt on the negative bus.f) Provision of an appropriate number of 100mm P.V.C. conduits between thisequipment and the track side of the substation.g) Installation of an electrolysis drainage bus bar to enable connection ofelectrolysis feeders.h) Interconnecting cables between the E.M.E. and above busbars.8.6 METERING REQUIREMENTAC supply is taken from the Electrical Network Operator and sometimes, thedepartment's feeders, either aerially or underground, usually at 22kV, 3 phase, 50Hz.Power metering is to be installed as per the Electrical Network Operatorsrequirements 7 .The designer shall provide the designs for the following:Electrical Network Operator requirement.a) A metering cubicle, in accordance with the Victorian Service & Installationrules.7 Refer to the Victorian Service and Installation Rules.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.
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VRIOGS 010.3 RevA - Public Transport Victoria

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