矿用低压馈电开关中选择性漏电保护的研究

Research on Selective Leakage Protection for Mining Low-voltage Feed 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,描述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。系统抗干扰性能好,实施电路简单,具有较高的实用价值。

Form the importance of installing selective leakage protection to underground low-voltage distribution network, the working principle of selective leakage protection based on the direction of measuring zero sequence current is descried, the selective leakage protective system with PLC as the central control unit is also introduced. On the basis of analyzing the soured of error, the hardware circuit is designed and the software program is written. The system has the better anti-interference performance, the simpler circuit, and the higher practical value.