基于DSP的井下选择性漏电保护装置设计

Design on Mine Selective Leakage Protection Device Based on DSP

针对当前煤矿井下选择性漏电保护存在的不足,对零序电流方向式漏电保护工作原理进行重点研究,提出采用零序电压启动,比较零序电压和零序电流的相位的方法来判断零序电流方向,从而实现选择性漏电保护。方案实施以DSP为控制核心,通过软件实现零序电压和零序电流的比相,最后给出硬件电路设计及软件程序流程图,并试验验证了对漏电故障正确的选择性保护。

According to the existing problems of the mine selective leakage protection, the paper had a study on the work principle of the zero sequence current direction mode leakage protection and presented the zero sequence voltage start method and the phase comparison between zero sequence voltage and zero sequence current method to judge the zero sequence current direction so as to realize the selective leakage protection. Based on DSP, the protection scheme was achieved with the phase comparison between the zero sequence voltage and the zero sequence current by the software. Finally the paper provided the hardware circuit design and the software program flowchart. The experiments were conducted to confirm the correct selective protection of the leakage fault.