The sensor used unbalanced principle of alternating electric field around feed cable to detect the state of electric field of cable core over the ground , thereby got out the result that the feed state of cable in mine had no relation to the current in the cable 该传感器利用馈电电缆周围交替电场的不平衡原理检测电缆芯线对地的电场状态，从而间接检测出矿井电缆的馈电状态与电缆是否有电流无关。
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