Transcription of Technical Specification for Secondary Substation Earthing
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Technical Specification for Secondary Substation Earthing
Technical Specification for Earthing and bonding at Secondary substations EART-03-003 Issue No. 1 SP Power Systems Limited Page 1 of 64 1. SCOPE This Technical Specification describes SPEN s requirements for Earthing and bonding systems at Secondary substations. This includes all HV/LV substations, HV switching stations, HV pole-mounted installations and HV customer substations up to and including 11 kV. It is intended for application to new build or existing substations where significant work is carried out on site ( switchgear replacement or transformer change), and is not retrospective. This Specification allows SPEN to demonstrate compliance with relevant national and international standards as well as statutory legislation and licence conditions.
Earth Fault A fault causing current to flow in one or more earth-return paths. Typically, a single phase to earth fault, but this term may also be used to describe two-phase and three-phase faults involving earth. Earth Fault Current (I F) The worst-case steady state RMS current to earth, resulting from a
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