什么是导致预充电阻损坏的原因?
预充电阻仅允许短时间流过小电流,持续进行预充电过程,或者在运行状态下预充电回路通过额定负载电流,都会造成预充电电阻发热量过大而烧毁,因此预充电阻损毁的可能有:
1. 待机状态时进线电网电压波动大,造成母线电压波动,导致预充电过程持续进行,预充电电阻上不断有电流流过,长时间发热造成损坏;
2.设备频繁上电、断电,或在已经报欠电压情况下,频繁多次复位启动,预充电电阻持续工作,长时间发热造成损坏;
3.多台AC/AC设备共用一台制动单元,造成共母线。当任意一台先上电时,相当于一组充电电阻对多个电容组充电,会造成预充电电流过大;
4. 预充电电阻通过负载电流:书本型设备,预充电继电器损坏,线圈通电后没有闭合,预充电电阻在设备运行时仍然工作;或装机装柜型设备,运行状态下可控硅发生触发故障,负载电流流过预充电回路。
找正阳兴预充电阻厂家,直接给您设计高品质预充电阻。
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