两种湿度下特高压尺度真型工程间隙操作冲击放电试验观测  

Observation of Leader Discharges in UHV Engineering Real-Size Air Gaps under Switching Impulse under Two Kinds of Humidity

作　　者：刘昌[1,2] 周旋[3] 庄池杰 刘磊[4] 曾嵘 Liu Chang;Zhou Xuan;Zhuang Chijie;Liu Lei;Zeng Rong(School of Electric Power South China University of Technology Guangzhou 510640 China;China Southern Power Grid Guangzhou 510663 China;State Key Lab of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China;China Southern Grid (CSG) Electric Power Research Institute Guangzhou 510663 China)

机构地区：[1]华南理工大学电力学院,广州510640 [2]中国南方电网有限责任公司,广州510663 [3]电力系统国家重点实验室清华大学电机工程与应用电子技术系,北京100084 [4]南方电网科学研究院,广州510663

出　　处：《电工技术学报》2019年第10期2239-2246,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51577098);特高压工程技术(昆明;广州)国家工程实验室开放基金;国家电网公司;南方电网公司科技项目资助

摘　　要：合理确定输电线路的空气间隙距离是特高压输电工程外绝缘设计的主要问题之一。搭建一套长间隙放电过程同步观测系统,并分别在位于北京与武汉的特高压试验基地开展真型工程间隙(6.7m的导线-杆塔间隙、10m的导线-导线相间间隙)操作冲击放电试验。试验结果表明:在北京地区秋冬季节绝对湿度较低,先导放电趋于连续、稳定发展,先导发展的一维平均速度较小,不同工况下平均值在1.6～2.1cm/μs之间,且速度波动很小。当绝对湿度较大时,先导放电趋于不连续、重燃发展,速度较大,不同工况下平均值范围为4.5～6.5cm/μs,且波动程度很大。The determination of air gap distances is one of the main issues in the external insulation design of UHV transmission systems. In this paper, a synchronized observation system was set up to obtain the detailed processes of large engineering gap discharges, and the tests of UHV real-size gaps breakdown under switching impulse voltages were carried out at the test bases in Beijing and Wuhan. The results indicate that the absolute humidity has significant influence on leader propagation. Leaders propagate continuously when the absolute humidity is low (experiments in Beijing), and the average velocities under different applied voltages are relatively smaller (1.6cm/μs to 2.1cm/μs) with little fluctuation. On the contrary, leaders propagate discontinuously with frequent re-illumination processes when the absolute humidity is high (experiments in Wuhan), and the average velocities are relatively higher (4.5cm/μs to 6.5cm/μs) with large fluctuation。

关 键 词：特高压 空气间隙放电 先导 重燃 

分 类 号：TM83[电气工程—高电压与绝缘技术]