描述
1.电流互感器运行异常现象
电流互感器在运行中发生二次回路开路时,会使三相电流表指示不一致、功率表指示降低、计量表计转速缓慢或不转。若是连接螺丝松动还可能有打火现象。
2.电流互感器异常运行的检查处理
在发现电流互感器有二次回路开路时,应根据现象判断是属于测量回路还是保护回路。在处理时要尽量减小一次负荷电流以降低二次回路电压。操作时要站在绝缘垫上,戴好绝缘手套,使用绝缘工具。
处理前应解除可能引起误动的保护,并尽快在互感器就近的电流端子上用良好的短接线将其二次侧短路后检查处理开路点。在短接时发现有火花,那么短接应该是有效的,故障点就在短接点以下回路中;否则可能短接无效,故障点仍在短接点以前回路中。
对查出的故障,能自行处理的,如接线端子等外部元件松动、接触不良等可直接处理,若开路点在其本体的接线端子上,应采取相应措施。
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