换流站阀塔光纤闪络和局部放电特性研究  

Research on Flashover and Partial Discharge Characteristics of Fiber in Valve Tower for Converter Station

作　　者：熊庆[1] 祝令瑜[1] 汲胜昌[1] 李斯盟 王琳[3] 刘楠 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]山东大学电气工程学院,济南250061 [3]中国电力科学研究院,北京100192 [4]国网榆林供电公司,陕西榆林719000

出　　处：《绝缘材料》2017年第6期59-63,68,共6页Insulating Materials

基　　金：中国电力科学研究院资助项目(GY71-14-004)

摘　　要：针对换流站阀塔光纤出现闪络和局部放电的问题,在直流电压叠加不同频率的交流电压下对光纤护套材料进行闪络试验,并测试实际光纤在工频叠加直流电压下的局部放电特性,分析护套材料对局部放电起始电压的影响。结果表明:交直流电压的比例不同,光纤护套材料的闪络电压也不同。S形布置的实际光纤在弱垂直分量电场下的局部放电主要集中在交流电压正半周的下降沿,并且护套材料的体积电阻率和相对介电常数的比值与光纤本体的比值越接近,其局部放电起始电压越高。Aiming at the flashover and partial discharge （PD） problems of optical fiber in valve tower for converter station, flashover tests were conducted on optical fiber sheathing materials under DC voltage superimposed AC voltage with different frequencies. Meanwhile, the PD characteristic of real fiber was measured under DC voltage superimposed AC voltage with power frequency, and the influence of sheathing materials on the PD inception voltage was analyzed. The results show that the flashover voltages of fiber sheathing materials are different under different ratio of AC and DC voltages. The PD of real fiber arranged with S shape under weak Vertical electric field concentrates on the falling edge of the positive half-circle of AC voltage. The PD inception voltage increases when the ratio of volume resistivity and dielectric constant of sheathing material gets closer to that of the fiber.

关 键 词：光纤闪络 局部放电 换流站阀塔 直流叠加交流电压 垂直分量电场 

分 类 号：TM215[一般工业技术—材料科学与工程] TM855[电气工程—电工理论与新技术]