摘要
污闪问题严重威胁着我国电力系统的安全运行,在线监测是电力系统运行维护的重要手段。绝缘子表面泄漏电流综合反映了绝缘子表面污秽程度、环境条件等因素的影响。为此,通过测量绝缘子表面泄漏电流可实现污秽程度的在线监测与预警,研究了饱和受潮条件下的泄漏电流与闪络电压的影响因素,试验结果表明,饱和受潮条件下的泄漏电流最大值与不同湿度条件下非饱和受潮绝缘子表面污层的泄漏电流值存在近似线性关系,分段线性化后可通过实测值预测饱和受潮泄漏电流最大值;综合考虑绝缘子形状系数、爬电距离、泄漏电流最大值的综合表征特征量与绝缘子在饱和受潮条件下的污闪电压存在负幂函数关系;建立了利用实测非饱和受潮泄漏电流值预测饱和受潮闪络电压的数学模型和污闪预警系统,江苏地区的运行结果表明该系统可实现污闪预警。
Pollution flashover is a serious threat to the operation safety for the power system. Online monitoring is the most important way for the operation and maintenance of power system. The leakage current on insulator surface is a comprehensive reflection of the insulator surface contamination, environmental conditions, and other affecting factors. The purpose of outdoor insulation state on-line monitoring could be achieved by measuring and monitoring the leakage current on insulator surface. Consequently, we analyzed the influential factors of leakage current and flashover voltage in saturated moisture conditions. Experimental results show that an approximately linear relationship exists between the leakage current under saturated humidity and non-saturated humidity, and piecewise linear models can be set up to simulate such a relationship. Meanwhile, an exponential relationship exists between pollution flashover voltage and the comprehensively-considered maximum leakage current under saturated humidity. Thereby, we proposed a model on predicting leakage current under saturated humidity based on experimental non- saturated humidity leakage current data, and verified the flashover pre-warning system built in Jiangsu province.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第11期3365-3373,共9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
泄漏电流
闪络电压
相对湿度
在线监测
预警系统
insulator
leakage current
flashover voltage
relative humidity
online monitoring
pre-warning system
