新型矿井低压电网选择性漏电保护装置研究

A New Mine Selective Earth Leakage Protection Device of low-voltage Distribution Networks

在分析目前矿井低压电网漏电保护系统的基础上,提出了一种以数字信号处理器(DSP)为核心,基于附加直流电源检测和零序功率方向的新型选择性漏电保护方案,简化了传统漏电保护的设计,可以改善井下低压电网漏电保护的动作性能。重点分析漏电保护系统原理,简要介绍保护装置的实现。现场运行表明,系统实现了漏电保护的快速性、选择性和准确性。

A scheme of new style selective leakage protection is put forward, on the analysis of the existing leakage protection system for low-voltage distribution networks underground mine, based on the DC power supply additional testing and the zero-sequence power direction with digital signal processor （DSP） as the core, which simplifies the design of conventional leakage protection device and enhance levels of safety for low-voltage distribution networks underground. The principles of protective systems is analyzed emphatically, the realization of protection is introduced briefly. The operation in the field shows that the system achieves rapidity, selectivity and accuracy.