Research on Condition Diagnosis Method of Arrester Based on Partial Discharge Testing Technology
Due to longtime use or external environmental influences,there are the phenomena of aging,damage,or failure in lightning arresters,which affects the accuracy of lightning arrester status diagnosis.To ensure the live diagnosis performance of light-ning arrester status,a lightning arrester status diagnosis method based on partial discharge testing technology is proposed.Simulate the generation process of internal air gap,spike,surface and other partial discharge phenomena,determine the operation characteris-tics of the arrester under different partial discharge conditions,which is taken as the diagnosis standard of the arrester status.Opti-mize the design of partial discharge signal acquisition equipment for lightning arresters,use this equipment to collect real-time status signals of lightning arresters,and extract operational status characteristics of lightning arresters from both statistical and time-fre-quency domain aspects.The partial discharge testing technology is used to calculate the discharge parameters of the lightning arrester,and obtain the diagnostic results of the lightning arrester status through the comparison of feature matching and discharge parameters.The experimental results show that in 200 kV and 500 kV lightning arresters,the average diagnostic errors of the proposed method for partial discharge quantity are 0.5pc and 1.0pc,respectively,the diagnostic errors for partial discharge phase amplitude are 0.01V and 0.01 V,and the average accuracy of state diagnosis is 99.5％and 99.6％.
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