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http://dx.doi.org/10.18770/KEPCO.2021.07.02.317

Analysis on Solid Insulator Flashover Characteristics on Moisture Contamination for Electrical Insulation Improvement of ESS  

Kim, Jin-Tae (KEPCO Research Institute, Korea Electric Power Corporation)
Lee, Seung-Yong (KEPCO Research Institute, Korea Electric Power Corporation)
Kim, Ji-young (KEPCO Research Institute, Korea Electric Power Corporation)
Seok, Bok Yeol (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.7, no.2, 2021 , pp. 317-321 More about this Journal
Abstract
As the large-scale renewable energy power plant increases, the high-capacity and compact Energy Storage System (ESS) is required. However, this trend could reduce the insulation reliability of ESS. In this study, the surface flashover characteristics for four types of solid insulators are investigated in the uniform electric field with AC and Lightning Impulse (LI) voltage waveforms under various contamination levels. In addtion, insulator surfaces are compared based on the contact angle before and after surface flashover. The experimental results show that AC flashover voltage is dependent on the materials and the contamination level, but LI flashover voltage is only associated with the contamination level. Especially, AC flashover voltage of PC (PolyCarbonate) is higher than that of other insulators, which is associated with the unique and sequential creepage discharge propagation pattern of PC. The localized discharges on the surface of PC form corresponding tracking points. Then, the interconnected trackings result in the complete flashover. This flashover patterns degrade the surface of PC much more than that of epoxy and Bulk Molding Compoud (BMC). Thus, the contact angle of PC is significantly reduced compared to that of other insulators. The increased hydrophilicity in the surface of PC enhances the insulator surface conductivity.
Keywords
Energy Storage System, ESS; Power Smoothing; Flashover; Solid Insulator; Breakdown; Contamination;
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