三峡至广东500kV线路广东侧直流换流站外绝缘爬电比距参考盐密的确定

三峡至广东500kV直流输电线路的设备外绝缘水平是工程建设的基本问题之一，因此对广东侧直流换流站站址所在区域的污秽状况进行了调查。通过分析该换流站站址区域的主要废气排放量、大气环境质量、气象状况和主要污染源的情况．确定了该换流站的交、直流污秽等级．以及在相应污秽等级下的参考盐密和爬电比距。

Determination of specific creepage distance and equivalent salt deposit density of external insulation for Guangdong-side converter station of 500 kV DC line from the Three Gorges to Guangdong

The equipment external insulation level of 500 kV DC transmission line from the Three Gorges to Guangdong is a basic consideration in the project, and an investigation was made into the pollution condition on the location for its Guangdong-side converter station. By analyzing the exhaust emissions, atmospheric and environmental quality, weather and major pollutant sources on the location, the AC/DC pollution grade of the converter station is determined along with corresponding specific creepage distance and equivalent salt deposit density (ESDD).