盐雾条件下染污绝缘子交流污闪特性

发布时间：2018-11-23 17:47

【摘要】：染污绝缘子表面污秽在盐雾中吸湿受潮,雾中的盐分沉积在绝缘子表面增大了其表面电导率,使得绝缘子闪络特性降低,绝缘子可能在较低电压甚至工作电压下发生闪络,威胁电网的安全稳定运行。本文对瓷、玻璃、复合三种典型绝缘子在不同盐密(SDD)和雾水电导率(?20)下的交流闪络特性进行试验研究,提出附加盐密(ASDD)的概念,分析了附加盐密与绝缘子表面盐密和雾水电导率的关系及其对交流闪络特性的影响。结果表明:随着盐密和雾水电导率的增大绝缘子交流雾闪电压均降低,且与盐密呈负幂指数关系,与雾水电导率呈线性关系。可以用附加盐密表征雾水电导率和盐密对绝缘子雾闪电压的综合影响,即附加盐密与雾水电导率和绝缘子盐密之积成正比。同时绝缘子闪络电压与绝缘子表面盐密和附加盐密之和呈负幂指数关系,绝缘子雾闪的本质是一种特殊的污秽闪络。
[Abstract]:The surface contamination of contaminated insulators is moisturized in salt fog, and the salt deposition in the fog increases the surface conductivity of insulators, which reduces the flashover characteristics of insulators, and the insulators may flashover at lower voltage or even working voltage. It threatens the safe and stable operation of power grid. In this paper, the AC flashover characteristics of porcelain, glass and composite insulators under different salt density (SDD) and fog conductivity (? 20) are studied experimentally, and the concept of additional salt density (ASDD) is proposed. The relationship between additional salt density and insulator surface salt density and foggy water conductivity and its influence on AC flashover characteristics are analyzed. The results show that the lightning pressure of the insulator decreases with the increase of the salt density and the conductivity of fog water, and the relationship between the lightning pressure and the salt density is negative power exponent, and it is linear with the conductivity of fog water. The combined effect of water conductivity and salt density on the lightning voltage of insulator fog can be characterized by adding salt density, that is, the additional salt density is directly proportional to the product of water conductivity and insulator salt density. At the same time, the flashover voltage of insulator has a negative power exponent relationship with the sum of salt density and additional salt density on the surface of insulator. The essence of insulator fog flashover is a special kind of filthy flashover.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);国网杭州供电公司;
【基金】：国家重点基础研究发展计划(973计划)(2014CB260401) 输配电装备及系统安全与新技术国家重点实验室自主重点项目(2007DA10512714101) 国家创新研究群体基金(51021005)资助
【分类号】：TM216

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