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Energies 2015, 8(6), 4983-4999; doi:10.3390/en8064983

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

1
State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400030, China
2
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
*
Author to whom correspondence should be addressed.
Academic Editor: Tariq Al-Shemmeri
Received: 16 March 2015 / Accepted: 22 May 2015 / Published: 28 May 2015
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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 (U50%) of CI/PAG were investigated. Test results show that the parallel air gap affected both the discharge path and U50%. With increasing ice thickness, U50% declined by up to 52%; this effect was more evident when the breakdown occurred in the air gap. The pollution severity affected U50% only when the flashover happened along insulator surface. With a decrease of atmospheric pressure, U50% decreased. U50% and the ratio of air pressure were in a power function relationship with a positive characteristic exponent which was relevant to the discharge path. View Full-Text
Keywords: DC icing flashover; composite insulator; parallel air gap; low air pressure; outdoor insulation DC icing flashover; composite insulator; parallel air gap; low air pressure; outdoor insulation
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

Hu, J.; Jiang, X.; Yin, F.; Zhang, Z. DC Flashover Performance of Ice-Covered Composite Insulators with Parallel Air Gaps. Energies 2015, 8, 4983-4999.

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