高壓(ya)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)差動(dong)保(bao)(bao)護(hu)裝置發電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)兩端流(liu)過方向(xiang)(xiang)相同、大小相等(deng)的電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)稱為(wei)(wei)(wei)穿(chuan)(chuan)(chuan)越(yue)性電(dian)(dian)(dian)(dian)(dian)(dian)流(liu),而(er)方向(xiang)(xiang)相反的電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)稱為(wei)(wei)(wei)非穿(chuan)(chuan)(chuan)越(yue)性電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)。作(zuo)為(wei)(wei)(wei)主(zhu)保(bao)(bao)護(hu),發電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)比率(lv)制動(dong)差動(dong)保(bao)(bao)護(hu)是以非穿(chuan)(chuan)(chuan)越(yue)性電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)作(zuo)為(wei)(wei)(wei)動(dong)作(zuo)量、以穿(chuan)(chuan)(chuan)越(yue)性電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)作(zuo)為(wei)(wei)(wei)制動(dong)量,來區分被保(bao)(bao)護(hu)元件的正常(chang)狀(zhuang)態(tai),故(gu)障狀(zhuang)態(tai)和(he)非正常(chang)運(yun)行狀(zhuang)態(tai)的。
正常運(yun)行(xing)狀態,穿越性電流即為(wei)負荷電流,非穿越性電流理(li)論為(wei)零。  
內部相間(jian)短路狀(zhuang)態,非穿越(yue)性電(dian)流劇增。
當外部故障時,穿(chuan)越性(xing)電流劇增。
在上述三個(ge)狀態中,保(bao)護(hu)能靈(ling)敏反(fan)應內部相(xiang)間短路狀態動作(zuo)出口,從而達到保(bao)護(hu)元件的(de)目(mu)的(de),而在正常運行和區外故障時可靠不(bu)動作(zuo)。
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