Study On Detection Of Partial Discharge In Power Transformer

Partial discharge is common on account of flaw and deterioration of insulation, especially in power transformer,and is the main reason of the accident of transformer and power system.Therefore,it's necessary and important to detect the partial discharge of transformer while operating and manufacturing.Lots of studies have been done for PD in transformer.Measurements are proposed based on the physical phenomenon occurring with PD,such as electrical impulse measurement,dissolved gas analysis(DGA),acoustic measurement,ultra high frequency (UHF),and flash spotting.Every measurement could achieve to detect PD,but be finitely applied in practice because of some factors,therefore,improvements of PD detection remains studied on.Supersonic-supersonic detection is a measurement widely used,because of the advantage that it could locate the position of PD easily.But great location error and low sensitivity usually exists in supersonic-supersonic detection for transformer PD,for minimizing the location error,this paper introduces RIV and acoustic combined detection aiming at the problem.As an improvement of supersonic-supersonic detection,RIV and acoustic combined detection analyses the problem of location error of supersonic-supersonic detection,and propose the improvement and design to minimize the location error.The improvement aims to advance the detecting system performance and make it combine good sensitivity and easy location,and furthermore,could improve the ability of anti-noise and minimize the error of location.Meanwhile,RIV and acoustic combined detection detect externally and its improvement could simplify the location and make the on-line detection and location come true,and providing with good application value.