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针对矿井高压供电中性点不接地系统、中性点经消弧线圈接地系统和经电阻接地系统 ,分析不同原理保护接地装置的性能、特点 ,确定了具有选线功能的低频信号注入法为最佳保护接地原理与取样方式 ,以该原理设计的保护接地装置 ,具有良好的选择性和高频抗干扰能力
In view of the high voltage power supply neutral point ungrounded system in the mine, the neutral point is connected with the arc suppression coil grounding system and the resistance grounding system, the performance and characteristics of different principle grounding devices are analyzed, and the low frequency signal injection method with line selection function is the most important Good protection grounding principle and sampling methods, designed to protect the grounding device, with good selectivity and high frequency anti-interference ability