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The Measurements of Switching Transients in 1000kV UHV Substations Using Optical Electric Field Measuring Technique

Transient overvoltage is an importance cause of the failures in power system. Optical technique has been developed to measure the transients in power system in a contactless mode, which has great advantages compared to traditional measuring technique based on electrical principles. To verify the on-site performances of optical technique in measuring switching transients in UHV substations, this paper presents the measurements using optical technique conducted in Yunan 1000kV substations at the moments of energizing transformer and transmission lines. With applying simplified de-coupling method, three-phase transients at two moments were clearly given.