高电压技术2017，Vol.43Issue(8)：2760-2768,9.DOI:10.13336/j.1003-6520.hve.20170731043
高海拔下交流500kV复合横担污闪特性
Pollution Characteristics of AC 500 kV Composite Cross-arm in High Altitude Area
摘要
Abstract
The application of composite cross-arm tower which saves the transmission corridor will be of a great significance.The 500 kV composite cross-arm comprises of two horizontal large size composite insulators which are arranged in "V" structure and two tensile composite insulators which are arranged in inclination position.In order to obtain the pollution characteristics of 500 kV composite cross-arm,we performed the pollution tests of full-scale AC 500 kV unilateral composite cross-arm with several pollution degree under the high altitude condition.Synchronously,the partial arc current and the flashover development process of pollution test were also studied.And the pollution outdoor insulation configuration margin of 500 kV composite cross-arm was verified.The results indicate that the 50％ flashover voltage of unilateral composite cross-arm presents a negative power relationship with pollution degree.The biggest partial arc current increases approximately in linearity form with the pollution degree at the 50％ flashover voltage.The sporadically discharge and partial arc discharge appear at the bottom side of the large diameter insulator more easily.The 50％ flashover voltage of bilateral composite cross-arm is lower than that of unilateral by approximately 3％,and the partial arc alternately appears at the bilateral composite cross-arm.The 500 kV composite cross-arm has a relatively high pollution insulation configuration.关键词
复合横担/高海拔/污闪特性/电弧电流/闪络Key words
composite cross-arm/high altitude/pollution characteristics/arc current/flashover引用本文复制引用
沈余峰,梁曦东,王家福,仵超,王国利,高超..高海拔下交流500kV复合横担污闪特性[J].高电压技术,2017,43(8):2760-2768,9.基金项目
中国南方电网科学研究院科技项目(K-KY2013-107).Project supported by Science and Technology Project of Electrical Power Research Institute of China Southern Grid(K-KY2013-107). （K-KY2013-107）
