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권동진(Dong-Jin Kweon),최인혁(In-Hyuk Chio),정길조(Gil-Jo Jung) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
This paper describes an application of the partial discharge measuring method in operating transformer. In the operating transformer, the useful PD signal may be superimposed by radio intereference voltage and impulse shaped noise signals generated by external corona or power electronics. In this paper, initial investigations after connecting the PD measuring system to the terminals of the measuring impedance showed a very high noise level of 3,700pC due to sinusoidal interferences. In order to reject these noises, this paper applied RIV and band-pass filters and noise gating method. The resulting measuring sensitivity was improved from 3,700pC to 160pC.