±500kV换流站直流场主设备典型外绝缘故障分析及对策  

Analysis and Countermeasure on Typical External Insulation Failure of Main Equipments of ±500 kV Converter Stations

作　　者：魏杰[1] 高海峰[1] 黄瑞平[1] 宿志一[1] 陕华平[2] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]国家电网公司运行分公司,北京市东城区100004

出　　处：《电网技术》2012年第12期276-282,共7页Power System Technology

摘　　要：±500 kV点对点输电线路已成为我国"大区联网"的重要方式。统计归纳了我国在运的±500 kV点对点输电线路的基本情况,对比了各直流系统换流站主设备的外绝缘配置,提出引起直流场主设备主要外绝缘故障的原因,即外绝缘配置不足、复合外绝缘表面憎水性下降或丧失和主设备的设计缺陷,并分别给出了针对性的对策。将换流站直流场主设备的放电类型进行了分类,指出发生过Ⅱ和Ⅲ类放电的设备,应在设备停运后喷涂室温硫化硅橡胶涂料或加装增爬裙。±500 kV transmission lines have become an important way to connect the large area power grids in China. The basic information of ±500 kV point-to-point transmission lines in China was summarized; external insulation configurations for main equipments of DC fields in converter stations were compared; primary causes leading to external insulation failures occurred in main equipments of DC fields, namely insufficient configuration of external insulation, weakening or losing surface hydrophobicity of composite external insulation and design defect of main equipments, were pointed out; and pertinentcountermeasures were given respectively. The types of discharge occurred on main equipments of DC fields in converter stations were classified and it was pointed out that for main equipments, on which the discharge in the second or the third level occurred, the RTV should be sprayed onto them or the booster shed should be added to them after the equipments were out of service.

关 键 词：直流系统 换流站 主设备 外绝缘 故障 

分 类 号：TM854[电气工程—高电压与绝缘技术]