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

Jiansheng Li, Zhi Li, Judong Chen, Yifan Bie, Jun Jiang and Xiaoping Yang
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Jiansheng Li: State Grid Jiangsu Electric Power Co. Ltd. Research Institute, Nanjing 211103, China
Zhi Li: Jiangsu Key Laboratory of New Energy Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Judong Chen: State Grid Jiangxi Maintenance Company, Nanchang 330001, China
Yifan Bie: Maintenance Branch of Chongqing State Grid Power Company, Chongqing 400039, China
Jun Jiang: Jiangsu Key Laboratory of New Energy Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Xiaoping Yang: Jiangsu Frontier Electric Technology Co. Ltd., Nanjing 211102, China

Energies, 2021, vol. 14, issue 23, 1-17

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

Keywords: transformer bushing; sealing condition; temperature; pressure; insulation oil (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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