直流系统接地故障监测系统中漏电流传感器的研制

Leakage Current Sensor Development for DC System Grounding Failure Monitoring

针对变电站二次侧的直流供电系统接地故障的查巡,介绍了一种智能漏电流传感器。此漏电流传感器利用电磁感应原理检测直流供电系统中电气负载馈电回路的不平衡电流,实现了对电气负载绝缘故障支路的检测。理论研究及现场实际运行结果表明,该传感器可以直接检测每条支路的不平衡电流,无需向直流操作回路注入任何信号,对直流操作回路无任何影响,且检测准确、灵敏度高,解决了电力系统接地故障监测的实际问题。

In order to detect the grounding faults in substation secondary-side DC system,an intelligent leakage current sensor is developed. This leakage current sensor can detect the leakage current of the loop circuit in DC power system by electromagnetic induction principle,and measure load insulation failures. Theoretical research and field operation verify that this sensor can detect the magnetic field generated by leakage current of each branch without injecting any signal into DC operating circuit,producing no bad effects on the DC power system. With accurate detection and high sensitivity,it solves the practical problems in grounding fault detection of DC power system.