高压换流阀内冷却系统水路环形均压电极应用研究  

Application Research on Ring-Type Grading Electrodes in Inner Cooling System for High Voltage Converter Valves

作　　者：张朝辉[1] 王行飞 王晨星 梁家豪[1] 王晨涛[1] 赵瑞雪 刘学忠[2] 焦秀英 ZHANG Chaohui;WANG Xingfei;WANG Chenxing;LIANG Jiahao;WANG Chentao;ZHAO Ruixue;LIU Xuezhong;JIAO Xiuying(Guangzhou Bureau,EHV Power Transmission Company,CSG,Guangzhou 510663,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China;Xi'an XD Power System Co.,Ltd.,China XD Group,Xi'an 710075,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司广州局,广州510663 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [3]西安西电电力系统有限公司,西安710065

出　　处：《南方电网技术》2022年第3期16-23,共8页Southern Power System Technology

基　　金：中国南方电网有限责任公司超高压输电公司科技项目(CGYKJXM20170177);国家自然科学基金(51477133)。

摘　　要：高压换流阀内冷水路中安装铂制针形均压电极是限制水路与散热器之间泄漏电流的主要措施,但存在电极表面结垢且易脱落而引发水路堵塞的问题。因此,提出了一种环形电极替代针形电极的解决方案,在实验室进行了环形电极与针形电极的模拟结垢试验,对比分析了两种均压电极上结垢物的分布特征。结果表明:设计的环形电极表面结垢速率降至针形电极的十分之一,且结垢物不易因过厚而发生脱落;同时,环形电极能够完全消除支流管水路两端电位差,从而大大抑制了因水路泄漏电流而导致的金属散热器腐蚀。The platinum pin-type grading electrodes are widely installed in the practical high voltage converter valve cooling system to limit the leakage current between the cooling water pipe and metallic heat sink.Then the deposited products on the grading electrodes fall off easily and probably result in water pipe blockage.Therefore a new design of ring-type grading electrode is proposed to replace the traditional pin-type grading electrode in this paper.The simulation deposition tests are carried out in the laboratery between the ring-type grading electrode and pin-type grading electrode.The distribution characteristics of deposited products on the two types of grading electrodes are analyzed contrastively.The test results show that the ring-type grading electrodes will effectively reduce the deposition rate to one tenth of the pin-type electrodes,and then lower the probability of falling off of deposition produt.Besides,the ring-type grading electrodes can eliminate the electric potential difference between the two ends of the tributary cooling water pipe,thus further inhibit the corrosion of metallic heat sinks led by the leakage current.

关 键 词：高压换流阀 内冷却系统 均压电极 结垢 泄漏电流 

分 类 号：TM721[电气工程—电力系统及自动化] TM41