基于独立分站的煤矿井下高压电网自适应保护系统方案

针对煤矿井下高压供电系统速断保护经常越级跳闸的问题,提出了一种基于独立分站的自适应保护系统方案。该方案通过对每条线路的电压、电流进行实时监视和分析,自动改变继电保护的整定值和特性以提高过流保护装置的灵敏性、可靠性;通过独立分站实现了速断保护的纵向选择性,为消除矿井高压电网长期存在的因短路故障而引起越级跳闸的安全隐患提供了技术支持。

A Scheme of Adaptive Protection System for High-voltage Power Grid of Coal Mine Underground Based on Independent Substation

To solve the problem of frequent over-grade trip of fast short-circuit protection in high voltage power supply system of coal mine underground,a scheme of adaptive protection system based on independent substation was proposed.By means of real-time monitoring and analysis on voltage and current of each transmission line,the setting value and characteristic of relay protection are automatically adjusted to enhance sensitivity and reliability of overcurrent protection device.By mean of independent substation,longitudinal selectivity of fast short-circuit protection is implemented.The scheme provides technical support to eliminate the potential safety hazard of over-grade trip caused by short-circuit fault that exists in mine high-voltage power grid for a long time.