矿井低压系统交直流混合漏电保护技术

利用控制变量法仿真分析了附加直流电源型漏电保护装置的检测电路对零序功率方向型漏电保护装置相位动作判据的影响,其实质是电网中性点接地参数对零序功率方向型漏电保护的影响问题。根据附加直流电源接入电网的形式,分别按三相电抗器、三相电阻两种类型推导分析了其参数对零序功率方向型漏电保护相位判据的影响,验证了目前漏电保护装置中大量使用的三相电抗器接入形式相对更优的观点。

Leakage protection technology with the hybrid AC and DC in the low-voltage system under coal mine

The paper analysed the impact of detecting circuit of the leakage protection device of additional DC power to the phase action criterion from the leakage protection device of zero-sequence power using the method of controlling variables to do the simulation.Its real problem was the impact of the neutral point grounding parameters to leakage protection of zero-sequence power direction.According to the form of additional DC power accessed to the network，the paper analysed the impact of the parameter variables to leakage current in the light of the three-phase reactance type and three-phase resistance type.It confirms the view that three-phase reactance equipment access which is largely used in the leakage protection device is better.