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Article

Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method

1
Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, China
2
Zhejiang Fangyuan Electrical Equipment Testing Co., Ltd., Jiaxing 314033, China
3
State Grid Electric Power Research Institute-Wuhan Nanrui Co., Ltd., Wuhan 430070, China
4
School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(11), 1893; https://doi.org/10.3390/electronics9111893
Received: 7 October 2020 / Revised: 4 November 2020 / Accepted: 8 November 2020 / Published: 11 November 2020
(This article belongs to the Special Issue Analysis and Optimal Design Method for Electric Machine and Devices)
Benefiting from self-healing features, metallized film capacitors (MFCs) are widely employed to compensate reactive power (VAR) and thus improve the performance of AC systems. To ensure the aforementioned functions, self-healing testing is a compulsory quality inspection for every type of MFC. In 2014, the International Electrotechnical Commission (IEC) issued a standard that recommended a general and instructive test procedure based on audible noise or ultrasound signals. However, more details relevant to this high voltage (HV) test were not provided. In this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star and delta MFCs, the waveform features, discharge energy, and spectrum distributions were analyzed. It was observed that the partial discharge always occurs before self-healing discharge with the same spectrum features ranging above 40 kHz. To solve the entanglement of these two discharge processes, a relative amplitude difference method is proposed. Based on the experimental observations, a detection algorithm incorporated with the ultrasonic emission sensors, preamplifier, and high-speed A/D converter was developed to assist the self-healing performance test. View Full-Text
Keywords: MFCs; self-healing discharge; performance test; ultrasound; ultrasonic features MFCs; self-healing discharge; performance test; ultrasound; ultrasonic features
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MDPI and ACS Style

Ma, Y.; Shen, H.; Pei, C.; Zhang, H.; Junaid, M.; Wang, Y. Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method. Electronics 2020, 9, 1893. https://doi.org/10.3390/electronics9111893

AMA Style

Ma Y, Shen H, Pei C, Zhang H, Junaid M, Wang Y. Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method. Electronics. 2020; 9(11):1893. https://doi.org/10.3390/electronics9111893

Chicago/Turabian Style

Ma, Yusheng; Shen, Haitao; Pei, Chunming; Zhang, Huanyu; Junaid, Muhammad; Wang, Yuxing. 2020. "Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method" Electronics 9, no. 11: 1893. https://doi.org/10.3390/electronics9111893

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