High Voltage Busbar Fault Standards
This technical article discusses criteria and requirements for designing protection systems for busbars in HV/EHV networks. Busbars have typically been left without dedicated protection, from the following reasons: It is a fact that the risk of a short circuit happening on modern metal clad equipment is insignificant, but it cannot be completely dismissed. It defines the minimum distances between live parts and between live parts and earthed metal parts. Busbar protection (BBP): Protection intended to detect and operate to clear faults on a busbar. High-impedance voltage differential protection is a solution to the challenge of CT saturation during external faults, as the high impedance of the relay forces the error current due to the saturated CT back through the CTs instead of the relay operating coil. This document is the responsibility of the Substations Asset Strategy Team, Tasmanian Networks Pty Ltd, ABN 24 167 357 299 (hereafter referred to as "TasNetworks").
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