摘要
为通过测量绝缘子表面泄漏电流实现污秽程度的在线监测与预警,对影响绝缘子饱和受潮条件下泄漏电流的因素进行了研究。提出了一种在大空间试验室中控制环境湿度的方法,通过人工污秽试验研究了在不同湿度条件下充分受潮后的绝缘子表面污层泄漏电流,分析了等值盐密、环境湿度对泄漏电流变化趋势的影响,并探讨了绝缘子在不同湿度条件下的泄漏电流之间的关系。研究结果表明泄漏电流与绝缘子受潮过程密切相关,无温差条件下可近似认为低湿度条件下测得的泄漏电流与饱和受潮状态下泄漏电流满足线性折算关系。进一步给出了利用低湿度条件下泄漏电流预测饱和受潮条件下泄漏电流的方法,并讨论了其适用范围。
In order to realize on-line monitoring of outdoor insulation by measuring the leakage current on insulator surface, we studied how the leakage current was affected by a variety of factors under saturated moist condition. With a fully controlling the environment humidity in a large space, we observed the leakage current flowing through the insulator surface that got fully wet in different humidity through artificial pollution tests, and hence analyzed the influences of equivalent salt deposit density（ESDD） and ambient humidity on the leakage current. Moreover, we discussed the relationship between the leakage current and ambient humidity. It is concluded that the leakage current is closely related to the wetting process of insulator, and if there is no difference in temperature, the leakage current under saturated humidity can be calculated from that under low humidity through a linear relationship between leakage current and humidity. The calculation method is put forward and its valid condition is discussed.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第5期1416-1423,共8页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2011CB209406)~~
关键词
绝缘子
饱和受潮
相对湿度
泄漏电流
电导率
闪络电压
污秽程度
insulator
saturated moisture
relative humidity
leakage current
conductivity
flashover voltage
contami-nation degree
