Oil Pressure Monitoring for Sealing Failure Detection and Diagnosis of Power Transformer Bushing

Power transformer bushings withstand great electrical and mechanical stress during high voltage current working conditions. Sealing failure poses a threat to the long-term reliable operation of bushing power transformer; however, criterion evaluate sealing status caused by problems is still lacking. In this paper, model established gain theoretical insight into relationship between temperature pressure compact multilayer bushing. To status, different conditions are tested based on monitoring within physical 110 kV The results show that can be diagnosed when fluctuation oil value exceeds curve in steady state 3 kPa. With reliability coefficients, gas leakage available further determined. primary auxiliary criteria its gradient proposed comprehensively actual condition bushing, wireless module developed at bottom valve, which quite beneficial field online application. It promising extend diagnosis oil-immersed equipment.