Abstract
This chapter presents a new methodology of diagnosis on insulation defects of GIS based on lightning impulse test. This methodology turns part of the lightning impulse voltage and current decomposed into a series of harmonics and constructs a discriminant function which can diagnose insulation defects of GIS. According to the extreme value of the discriminant function, the diagnosis on insulation defects of GIS can be achieved. Whether the GIS passing lightning impulse withstand voltage test has insulation damage or not can be detected, which is quite instructive for insulation supervision of GIS.
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