dc flashover performance of various types of ice-covered insulator strings under low air pressure直流闪络性能的各种类型的冰雪覆盖的绝缘子串在空气压力低.pdf

Energies 2012, 5, 1554-1576; doi:10.3390/en5051554 OPEN ACCESS energies ISSN 1996-1073 /journal/energies Article DC Flashover Performance of Various Types of Ice-Covered Insulator Strings under Low Air Pressure Jianlin Hu 1,*, Caixin Sun 1,†, Xingliang Jiang 1, Daibo Xiao 2, Zhijin Zhang 1 and Lichun Shu 1 1 State Key Laboratory of Power Transmission Equipments System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400030, China; E-Mails: xljiang@ (X.J.); zhangzhijing@ (Z.Z.); lcshu@ (L.S.) 2 Hubei Suizhou Electric Power Supply Company, Suizhou 441300, China; E-Mail: cqdbxiao@ † Deceased on 25 November 2011. * Author to whom correspondence should be addressed; E-Mail: hujianlin@; Tel.: +86-23(ext. 8219); Fax: +86-23 Received: 9 April 2012; in revised form: 15 May 2012 / Accepted: 15 May 2012 / Published: 21 May 2012 Abstract: In this study, icing flashover performance tests of typical DC porcelain, glass, and composite insulators are systematically carried out in a multifunction artificial climate chamber. The DC icing flashover voltages of seven typical insulators under various conditions of icing thickness, pollution severity before icing, string length, and atmospheric pressure are obtained. The relationships between icing thickness, salt deposit density as well as atmospheric pressure and the 50% icing flashover voltage are analyzed, and the formulas are obtained by regression method. In addition, the DC icing flashover voltage correction