PARTIAL DISCHARGE DIAGNOSTIC METHOD AND SYSTEM OF GAS INSULATING APPARATUS

摘要

PROBLEM TO BE SOLVED: To solve a problem of conventional diagnosis only by the discharged charge amount wherein the risk of dielectric breakdown largely depends on a discharge occurrence place.;SOLUTION: The gas insulating apparatus comprises a plurality of detectors 5 for detecting a partial discharge signal generated with a foreign substance and a frequency analysis section 11 for frequency-analyzing the detected partial discharge signal. The gas insulating apparatus comprises a defect type determining section 12 for estimating the defect type of the foreign substance based on the analysis waveform or a voltage phase of the partial discharge synchronizing with the applied frequency of the gas insulating apparatus, and a position evaluating section 13 for estimating the defect position and signal intensity based on a plurality of partial discharge signals. The gas insulating apparatus also comprises a defect size calculation section 14 for estimating the defect size using signal intensity and electric field distribution (structure DB 24) at the defect position every defect type. When the foreign substance is a projection on a conductor, the electric field strength and electrical field non-uniform rate of a projection section showing the electric field distribution are used. When the foreign substance is a foreign substance adhering to a spacer surface, the electric field strength in the spacer surface direction is used. Risk evaluation of evaluating the risk of the dielectric breakdown based on the defect size and defect type is performed, and the risk of insulating abnormality of the gas insulating apparatus is diagnosed based on the generated partial discharge.;COPYRIGHT: (C)2006,JPO&NCIPI