On-line diagnostics of high-voltage bushings and currenttransformers using the sum current method

摘要

Experience with the application of the sum current method tonon-line diagnostics of high-voltage bushings and current transformers isnpresented. The method and analysis are described along with fieldnexperience obtained at fourteen substations, comprising 56 sets ofn(three) bushings and current transformers. The influences ofntemperature, humidity and changes in more than one bushing are discussed