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Energies 2017, 10(9), 1411; doi:10.3390/en10091411

Breakdown Voltage and Its Influencing Factors of Thermally Aged Oil-Impregnated Paper at Pulsating DC Voltage

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
2
Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Akhtar Kalam and Tapas Mallick
Received: 27 July 2017 / Revised: 30 August 2017 / Accepted: 12 September 2017 / Published: 15 September 2017
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Abstract

Breakdown strength is an important electrical property of insulating paper. Oil-impregnated paper of various aging states was prepared. Its breakdown voltage was then measured at pulsating direct current (DC) voltage with various ripple factors, and alternating current (AC) and DC voltage for comparison, respectively. The AC breakdown voltage is the smallest, and pulsating DC (r = 1/5) breakdown voltage is the greatest before the paper reaches its end of life. A dielectric model was adopted to investigate the difference in magnitude of breakdown voltage at different voltage waveforms. Meanwhile, it was found that breakdown voltage fluctuated and even increased occasionally during the thermal aging process, and a somewhat opposite changing tendency versus aging time was observed for breakdown voltage at DC voltage and pulsating DC voltage with small ripple factors (r = 1/5 and 1/3), compared with AC voltage. The degree of polymerization (DP) and moisture content of the paper were measured, and the characteristics of the pores and cracks of the paper were obtained to investigate the possible influencing factors of breakdown voltage at different aging states. The results showed that the moisture content, oil absorption ability associated with pores and cracks of paper, and the damage to paper structure all contributed to the variation of the breakdown voltage versus aging time, while the importance of their influence differed as the aging state of paper varied. View Full-Text
Keywords: breakdown voltage; pulsating DC voltage; thermal aging; double-composite dielectric model; oil absorption ability; oil-impregnated paper breakdown voltage; pulsating DC voltage; thermal aging; double-composite dielectric model; oil absorption ability; oil-impregnated paper
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, J.; Wang, F.; Li, J.; Ran, H.; Li, X.; Fu, Q. Breakdown Voltage and Its Influencing Factors of Thermally Aged Oil-Impregnated Paper at Pulsating DC Voltage. Energies 2017, 10, 1411.

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