1.滑觸線向上或左右弓起;
2.滑線整體串動;
3.集電器從滑線中脫落引起單相接地、相間短路等;
4.滑觸線導電體上有不均勻的電弧燒損的凹凸坑;
5.集電器電刷磨損快,表麵有顆粒狀凹凸坑,側麵有擦痕;
6.滑觸線絕緣護套頂部、側麵有堆取料大車堆取料時掉下的塊狀料砸傷的(洞)造成滑線絕緣損壞;
7.滑觸線兩側麵有滑痕等等。
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