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1.故障现象设备起动后,将直流电压调至500V,这时直流电流表指示320A,功率表指示160kW,设备工作正常。但电流和功率很快下降至200A和100kW,直流电压不变。此后上述表计指示不再变化,炉内工料只发红而不能熔化。 2.故障检查从设备的运行情况来看,整流电路工作正常。电流、电压和功率值符合换算关系,逆变电路工作也正常。检查中发现个别中频电容器外形鼓胀,怀疑电容器有损,容量不足,但更换新电容器后故障依旧。水冷电缆和铜排的接触良好,无发热现象。由于起动容易,因此水冷电缆断路的可能性可以排除。考虑到前几天发生洪涝灾害,炉子可能受潮,测量其绝缘电
1. Symptom After the equipment is started, the DC voltage is adjusted to 500V, then the DC ammeter indicates 320A, the power meter indicates 160kW, the equipment is working normally. But the current and power quickly dropped to 200A and 100kW, DC voltage unchanged. Since then the above meter does not change the instructions, the furnace material only red and can not be melted. 2 fault check From the operation of the equipment point of view, rectification circuit is working properly. Current, voltage and power values in line with the conversion, the inverter circuit is working properly. Check found that individual IF capacitor shape bulging, suspect the capacitor is damaged, the capacity is not enough, but the replacement of the new capacitor fault still. Water-cooled cable and the copper contact is good, no fever. Because of the ease of starting, the possibility of a water-cooled cable breaking can be eliminated. Taking into account the floods occurred a few days ago, the furnace may be damp, measuring its insulation electricity