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1 故障现象与排查 某目,我矿2#电动挖掘机在工作过程中正常停机后,再启动机组时出现整个机组转速较低(约为额定转速的1／3),并伴有嗡嗡的闷响声。检查三相高压隔离开关GK,高压保险GRD,高压真空断路器G等外围电路,都无断相现象。怀疑高压拖动电动机GD有故障,断开机组联轴节,空载启动高压拖动主电动机GD,电机转速、电流均正常。因此重点怀疑机组
1 breakdown and troubleshooting of a certain project, mine 2 # electric excavator in the normal shutdown of the work process, and then start the unit when the entire unit lower speed (about the rated speed of 1/3), accompanied by buzzing Muffled sound. Check the three-phase high-voltage disconnector GK, high-voltage insurance GRD, high-voltage vacuum circuit breaker G and other peripheral circuits, no phase phenomenon. Suspected high pressure drag motor GD fault, disconnect the unit coupling, no-load high-pressure drag drive main motor GD, motor speed, current are normal. Therefore, the focus of doubt unit