铁道供电高压污秽绝缘子泄漏电流在线检测系统研究

Online Monitoring System of Leakage Current for High-voltage Polluted Insulators in Railway Power Supply

高压绝缘子是铁道牵引网中连接支柱和接触线的重要设备,其绝缘状况直接影响供电系统的安全和稳定。文中分析了高压绝缘子污秽闪络放电的机理,系统研究了泄漏电流大小、脉冲频次与绝缘子污秽程度以及湿度等环境变量的关系,提出了检测绝缘子泄漏电流有效值及脉冲频次相结合的方法综合评估绝缘子的状况。试验结果表明,在线检测系统可以有效地对铁道供电输电线路高压绝缘子泄漏电流实时监测。

For effectively monitoring insulation condition of high voltage insulators in railway power network,the mechanism of pollution flashover on the high-voltage insulator is analyzed, and the relationships among the leakage current, pulse frequency, pollution degree of insulator, and ambient humidity are studied systematically. Hence, an insulator condition evaluation method is proposed by combining the effective value of leakage current and the pulse frequency. Experimental results show that the proposed online monitoring system can reliably monitoring leakage current of high-voltage insulators in railway power supply system.