VRIOGS 010.3 RevA - Public Transport Victoria

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28 VRIOGS 010.3 Revision A8.12.2The substation will undergo routine and major maintenance in accordance withplanned preventative maintenance schedules, produced for each location and eachitem of equipment, in accordance with manufacturer's recommendations. In addition,it may be necessary for operators/maintenance gang to be on site for a considerableperiod of time and allowance for such shall be considered in the design.8.12.3Aspects of Design that have an influence on future maintenance include thefollowing:a) The design shall specify enclosures, brackets, equipment andsteelwork generally (particularly where used outdoors), that arecorrosion resistant. Stainless steel shall be used where it can bejustified.b) The design and layout of plant and equipment shall facilitate ease ofaccess, minimum time and safety for routine maintenance andemergency repairs.c) Generally, standard products (or products accepting standard stocklines) shall be used to allow for minimum spares to be carried intostock. Where superior performing products or equipment areavailable, they shall be referred to the Department for prior approval.8.13 EARTHING REQUIREMENTSThe designer shall be responsible for designing a complete earthing system,providing safety (both within and outside the substation fence) to all personnel(including the public), as well as protecting all HV Plant and equipment from damage,during fault conditions.8.13.1.1 GENERALa) A soil resistivity test shall be carried out prior to any earthing design.The resistivity test shall be carried out using the ESAA – SubstationEarthing Guide for guidance.b) Earthing for the substation shall be in the form of a grid beneath thebuilding and switchyard and shall be designed with reference to thedesign procedure as set out in AS 2067, Appendix C.c) The combined earthing principle of providing an earth bar as per AS3000 shall be adopted to which each piece or group of electricalequipment shall be terminated and suitably identified.d) Earthing for the substation shall observe the following:• Bare copper earth grid conductors with a cross sectional area of70mm 2 shall be used in the earth system to minimise corrosion andmechanical strength. The Copper earthing electrodes shall have aminimum diameter of 16mm and a length of 3m.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 298.13.2• The earth grid system shall be designed for installation at a nominaldepth of 500mm below foundations level.• The earth grid shall continue under and around the switchyard andbe designed such that safe step, touch and transfer potentials areachieved.• Sub-ground jointing shall be by cadwelding or brazing.• The total earth grid resistance shall be less than 1 ohm.• The design shall provide for the connection of the switchroom mainearth bar to the outside earth grid. Disconnection point for testingshall be at the main earth bar. There shall be some means tovisually and electrically confirm the connection of the switchroomearth bar to the external earth grid.• The design shall provide for connection of earth grid to buildingreinforcing bars.In accordance with AS 2067, all outdoor metal equipment, structures and fencesshall be earthed directly to the earth grid.8.13.3In accordance with AS 2067, galvanised mesh or steel plate earth mats shall be usedto ensure safety of personnel who are required to operate switchgear in theswitchyard.8.13.4 APPARATUS TO BE EARTHED THROUGH EARTH BARApparatus to be Earthed Through Earth Bar:• AC HV switchgear enclosures and HV current transformer windings, if indoor• Main transformer tank, if indoor• Auxiliary transformer tank and Auxiliary Transformer Neutral Terminal, if indoor• Signal transformer tank• Signal switchgear• AC HV bus structures and anchorages for AC HV aerials, if provided.• The screen of HV AC cables.• 415V/240V switchboard• 110V battery negative• Remote Terminal Unit of SCADA system.8.13.5 APPARATUS TO BE EARTHED VIA AN EARTH LEAKAGEPROTECTION RELAY (64A) TO THE EARTH BARApparatus to be earthed via an earth leakage protection relay (64 A) to the earth bar: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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