盐/灰密对不同型式绝缘子交流人工污秽闪络特性的影响

Influence of Salt/Non-soluble Deposit Density on AC Artificial Pollution Flashover Performances of Various Types Insulators

污秽闪络特性是输电线路外绝缘选择的重要依据之一。根据一系列人工污秽试验,文中分析了等值附盐密度、灰密对不同型式绝缘子交流污闪特性的影响。结果表明:随着盐密或灰密的增加,绝缘子的污闪电压下降,且盐密和灰密对污闪电压的影响是相互独立的。使用最小二乘法分析6种绝缘子的污闪试验结果,得到其污闪电压校正公式。分析可知盐密和灰密对不同型式绝缘子污闪电压的影响有差异,特征指数c、d反应了盐密和灰密对污闪特性的影响程度。

Pollution flashover performance is one of the key issues of external insulation selection of transmission lines. Based on a series of artificial pollution tests, the influences of equivalent salt deposit density ρESDD and non-soluble deposit density ρNSDD on AC flashover performances of various types of insulators under contaminated condition were analyzed. The polluted flashover voltages of insulators reduce with the increase of salt density or dust density, and both the influences of salt density and dust density on polluted flashover voltages are independent each other. By using the least square method, the correction formulas of the flashover voltages of the six types of insulators were proposed. The influences of salt density and dust density on the polluted flashover voltages of various types of insulators are different and can be characterized with the exponents c and d respectively.