诊断信号法漏电保护系统的研究与应用

Research and Application of Diagnostic Signal Based Leakage Protection System

主要介绍了煤矿井下高压供电网络发生单相接地时容性电流的分布规律和特点,以及煤矿井下电网漏电保护的基本原理和应用现状,总结了目前技术存在的弊端。结合现场工程实际,提出了一种新型的煤矿井下高压电网漏电保护方法。该方法采用注入诊断电流信号和开关内部保护器,通过算法分散检测诊断信号,判断和保护电网故障线路,弥补了传统漏电保护通过零序电流判断接地线路的缺陷,提高了煤矿井下高压漏电保护的准确度以及煤矿井下供电的安全性。

This paper mainly introduces the distribution law and characteristics of capacitive current when single-phase grounding occurs in the high-voltage power supply network underground in coal mines,as well as the basic principle and application status of leakage protection in coal mine underground power grids.It summarizes the current technical drawbacks.A new type of leakage protection method for underground high-voltage power grids in coal mines is proposed based on on-site engineering practice.This method uses injection of diagnostic current signals and internal protectors of switches,and uses algorithms to detect diagnostic signals in a dispersed manner to identify and protect faulty power lines in the power grid.It compensates for the shortcomings of traditional leakage protection in detecting grounding lines through zero sequence current,improves the accuracy of high-voltage leakage protection in coal mines,and ensures the safety of underground power supply.