在分析国内漏电保护装置现存问题的基础上,提出了一种基于群体比幅比相和零序电流幅值法原理综合利用,可以智能实现漏电保护的横向、纵向选择性的矿井低压电网集中选择性漏电保护系统。该系统以32位DSP处理器为核心,重点讨论该系统的工作原理、硬件结构、软件设计。经现场运行实现了漏电保护的快速性、选择性和准确性。 Based on the analysis of the existing problems of the earth leakage protection device in our country, a new method based on the comprehensive utilization of the population ratio amplitude ratio and the zero-sequence current amplitude method is proposed, which can intelligently realize the horizontal and vertical selection of mine low-voltage grid Leakage protection system. The system takes 32-bit DSP processor as the core, and focuses on the working principle, hardware structure and software design of the system. The field operation to achieve the rapid leakage protection, selectivity and accuracy.