bob足彩

使用常识

高压电动机应装设的保护

来源:子昂电机维修 日期:2021-08-21 14:45:30

1)电(dian)流(liu)速断保护--电(dian)动机定子绕组(zu)相间短(duan)路(lu)的保护,一般用于2000kW以下的电(dian)动机,动作于跳闸. 

2)纵(zong)联差动保(bao)(bao)护(hu)--对于2000kW及(ji)(ji)以上的电(dian)动机,或2000kW以下电(dian)动机的电(dian)流速断保(bao)(bao)护(hu)的灵(ling)敏度满足不了要求时,采(cai)用(yong)差动保(bao)(bao)护(hu)来对电(dian)动机内部及(ji)(ji)引出线相间短路进行保(bao)(bao)护(hu),动作于跳闸. 

3)过(guo)负载保护--预(yu)防电动(dong)机(ji)所拖动(dong)的(de)生产机(ji)械过(guo)负荷(he)而引(yin)起的(de)过(guo)电流,动(dong)作于信号或带(dai)一(yi)定(ding)时限(xian)动(dong)作于跳闸. 

4)单(dan)相接(jie)地(di)(di)(di)保(bao)护--在小接(jie)地(di)(di)(di)电(dian)(dian)(dian)流系统中,当接(jie)地(di)(di)(di)电(dian)(dian)(dian)流大于5A时(shi),为(wei)预(yu)防电(dian)(dian)(dian)流电(dian)(dian)(dian)动机(ji)定子绕组单(dan)相接(jie)地(di)(di)(di)故(gu)障的(de)危害,必须装设(she)单(dan)相接(jie)地(di)(di)(di)保(bao)护,接(jie)地(di)(di)(di)电(dian)(dian)(dian)流值为(wei)5A~10A时(shi),动作于信号;接(jie)地(di)(di)(di)电(dian)(dian)(dian)流大于10A时(shi),动作于跳闸. 

5)低电压保护--防止电压降低或中断电动机自启动的保护,动作于跳闸,可根(gen)据需要(yao)装设。