矿用低压馈电开关中选择性漏电保护

Selective Leakage Protection in the Low Voltage Feeder Switch

从煤矿井下低压电网中装设选择性漏电保护的重要性入手,说明了基于零序电流方向的选择性漏电保护的工作原理,介绍了以PLC为中央控制单元的选择性漏电保护系统。在分析了误差来源的基础上设计了硬件电路,编写了软件程序。分析认为,系统抗干扰性能好,实施电路简单,具有较高的实用价值。

The importance of a selective leakage protection system in underground LV distribution networks are installed, and explains the principle of selective leakage protection based on zero sequence current direction,introduces the selective leakage protection system of the central control unit based on PLC. Based on the analysis of the error sources on the design of hardware circuit, the software analysis. System, good anti-interference performance,simple circuit implementation, it has a high practical value.