The Influence of Pressure on the Discharge along Oil-Paper Interface under AC Stress

Guangcai Hu, Guangning Wu, Rui Yu, Peng Zhou, Bo Gao, Yan Yang and Kai Liu
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Guangcai Hu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Guangning Wu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Rui Yu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Peng Zhou: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Bo Gao: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Yan Yang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Kai Liu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Energies, 2019, vol. 12, issue 10, 1-16

Abstract: This study explores the influence of hydrostatic pressure on the discharge along the oil-paper interface under AC voltage, especially for the normal operating condition and breakdown. In this paper, an experimental platform was set up to record the partial discharge (PD) parameters of the test sample under different hydrostatic pressures, while the applied AC voltage was increased to final flashover voltage step by step. Experimental results showed that higher hydrostatic pressure had different effects on PD under different voltages. Higher pressure decreased the PD energy and increased the flashover voltage. Furthermore, under higher hydrostatic pressure, discharge traces (white mark) were found on the surface of the samples after intense discharging on the oil-paper interfaces, indicating that the hydrostatic pressure can affect the gas generation and dissipation process underneath the surface of the pressboards. Finally, the mechanism of how hydrostatic pressure influences the PD, flashover voltage, and white mark was interpreted based on the bubble theory. The results derived in this paper can be helpful for an optimal design and reasonable operation of oil-paper insulation systems, especially for power transformers.

Keywords: oil-paper interface; normal operating condition; hydrostatic pressure; partial discharge; flashover; white mark; bubble effect (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: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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