DC Flashover Performance of Ice-Covered Composite Insulators with Parallel Air Gaps

Jianlin Hu, Xingliang Jiang, Fanghui Yin and Zhijin Zhang
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Jianlin Hu: State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400030, China
Xingliang Jiang: State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400030, China
Fanghui Yin: NSERC/Hydro-Quebec/UQAC Industrial Chair on Atmospheric Icing of Power Network Equipment (CIGELE) and Canada Research Chair on Engineering of Power Network Atmospheric Icing (INGIVRE), Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada
Zhijin Zhang: State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400030, China

Energies, 2015, vol. 8, issue 6, 1-17

Abstract: DC flashover performance of ice-covered composite insulators with a parallel air gap (CI/PAG) is an important technical consideration when such insulators are used to isolate ground wires for the purpose of DC ice-melting. Tests on tension and suspension types of CI/PAG were thus carried out in the artificial climate chamber to investigate their DC icing flashover performance. The influences of parallel air gap, ice thickness, pollution severity and air pressure on DC negative 50% flashover voltage ( U 50% ) of CI/PAG were investigated. Test results show that the parallel air gap affected both the discharge path and U 50% . With increasing ice thickness, U 50% declined by up to 52%; this effect was more evident when the breakdown occurred in the air gap. The pollution severity affected U 50% only when the flashover happened along insulator surface. With a decrease of atmospheric pressure, U 50% decreased. U 50% and the ratio of air pressure were in a power function relationship with a positive characteristic exponent which was relevant to the discharge path.

Keywords: DC icing flashover; composite insulator; parallel air gap; low air pressure; outdoor insulation (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: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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