【摘要】 为限制超标的单相接地电流而在矿井高压电网中引入了消弧线圈 ,这使得现有漏电保护的选择性性能受到严重影响。本文在分析电网漏电故障规律及现有检漏装置原理基础上 ,提出将五次谐波方向原理用于井下高压隔爆开关中 ,从而使选择性漏电保护适于各种中性点接线方式的电网。重点介绍以微控制器为核心的选择性漏电保护系统的硬、软件结构及干扰抑制措施 ,最后给出试验结果。更多还原

【Abstract】 The installed selective leakage protection equipment for underground HV networks does not work properly owing to the application of the arc suppression coil,by which the earthing current is compensated.On the basis of analyzing the fault law of leakage and the principles of present leakage protection equipment,the paper presented a selective leakage protection method suitable for all kinds of underground HV networks,which operates according to the fifth harmonic direction of the zero sequence current as well as the value of the zero sequence voltage.The hardware structure,software design and anti interference of the system are emphatically discussed.Finally,the testing result is described as well.更多还原