基于闪络电压预测的污闪预警系统

发布时间：2018-04-26 13:55

本文选题：绝缘子 + 泄漏电流　；参考：《高电压技术》2014年11期

【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。
[Abstract]:Pollution flashover is a serious threat to the safe operation of power system in China. On-line monitoring is an important means of power system operation and maintenance. The leakage current of insulator surface reflects the influence of insulator surface pollution and environmental conditions. Therefore, by measuring the leakage current on the surface of insulator, the on-line monitoring and warning of contamination degree can be realized, and the influence factors of leakage current and flashover voltage under saturated damp condition are studied. The experimental results show that, There is an approximate linear relationship between the maximum leakage current under saturated damp and the leakage current on the surface of unsaturated damped insulator under different humidity. The maximum leakage current of saturated damped insulator can be predicted by the measured data after piecewise linearization. Considering the insulator shape coefficient, creeping distance and leakage current maximum, there is a negative power function relationship between the characteristic quantity and the insulator's flashover voltage under saturated damp condition. A mathematical model and a pollution flashover warning system are established to predict the saturated dampened flashover voltage by using the measured unsaturated dampened leakage current value. The results of operation in Jiangsu Province show that the system can realize the pollution flashover warning.
【作者单位】：清华大学深圳研究生院;江苏省电力公司电力科学研究院;
【基金】：国家重点基础研究发展计划(973计划)(2011CB209406)~~
【分类号】：TM732;TM216

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