Study on Consistency of Failure Probability Characteristics of Oil-Paper Insulation Under Different Impulse Voltages

Due to the different overvoltage waveforms and the different distribution of the waveform parameters, the failure characteristics of insulating medium under these overvoltage waveforms are significantly different. However, the failure probability characteristics are closely related to the risk assessment of insulation failure of power system. Meanwhile, the failure probability characteristics of insulating medium under different overvoltage waveforms are not fully understood. Therefore, it is necessary to carry out research on the difference of failure probability characteristics of insulating material under different impulse voltages. In this paper, a double exponential impulse wave (DEIW) and bipolar oscillatory attenuated impulse wave (BOAIW) test platform was set up. Then, we obtained the failure probability of oil-immersed insulation paper (OIP) for transformer under the DEIW and the BOAIW. The differences and commonalities of the failure probability characteristics of OIP under different waveforms were further analyzed. Finally, we realized the prediction of the failure probability characteristics of oil-paper insulation under different impulse voltages.