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针对低压中性点不接地系统漏电保护系统存在的缺陷,设计了一种基于μC/OS-II与LabVIEW的井下低压选择性漏电保护系统。该漏电保护装置采用集中控制模式与零序电流相对比幅法、零序电流方向法和零序电流群体比幅比相法相结合的漏电选线方法完成数据采集;监控软件实时监测井下低压电网运行状态,对漏电故障进行报警和记录。应用表明,该漏电保护系统人机界面友好,能够可靠、快速地实现漏电保护,提高了低压电网供电的稳定性。
Aiming at the defects of low voltage neutral point ungrounded system leakage protection system, a low voltage selective leakage protection system based on μC / OS-II and LabVIEW was designed. The leakage protection device adopts the method of the leakage line selection combining the centralized control mode and the zero-sequence current relative amplitude method, the zero-sequence current direction method and the zero-sequence current population ratio ratio method, and the monitoring software real-time monitors the underground low-voltage power grid operation State, the leakage fault alarm and record. The application shows that the man-machine interface of the earth leakage protection system is friendly, the leakage protection can be reliably and quickly realized, and the stability of the power supply of the low-voltage power grid is improved.