一种矿用低压漏电保护装置设计

Design of a mine-used low-voltage leakage protection device

针对基于零序功率方向选线原理的煤矿低压电网漏电保护装置可靠性不高的问题,给出了一种矿用低压漏电保护装置软硬件设计方案。该装置根据零序电抗器并联电阻接地系统发生单相接地故障时零序电流与零序电压相位差在非故障支路与故障支路中的差异性实现故障选线。仿真及试验结果表明,该装置不受电网中零序电抗器补偿的影响,发生单相接地故障时能够快速、可靠动作。

In view of low reliability of leakage protection device of coal mine low-voltage power grid based on line selection principle of zero-sequence power direction,a hardware and software design scheme of mine-used low-voltage leakage protection device was given.Fault line selection is realized according to differences of phase difference between zero-sequence current and zero-sequence voltage in non-fault branch and fault branch when single-phase grounding fault occurs in zero-sequence reactor grounding system with parallel resistance.The simulation and test results show that the device is not affected by zero sequence reactor compensation in power grid,and can operate quickly and reliably when single-phase grounding fault occurs.