安全補(bu)(bu)償中有分相(xiang)補(bu)(bu)償和三(san)相(xiang)共補(bu)(bu)兩種方式，前者是采用單(dan)相(xiang)電容器進行單(dan)相(xiang)補(bu)(bu)償，而(er)后者是三(san)相(xiang)電容器同時(shi)補(bu)(bu)償。通常情況下(xia)，只有存(cun)在三(san)相(xiang)不(bu)平衡(heng)的(de)系統中才需要進行分相(xiang)補(bu)(bu)償；而(er)一般的(de)單(dan)相(xiang)系統，如果負載(zai)不(bu)存(cun)在三(san)相(xiang)不(bu)平衡(heng)用共補(bu)(bu)就可以了(le)。

純(chun)電容(rong)無功補(bu)償(chang)柜(ju)不補(bu)償(chang)的原因

交流電(dian)源所能提供的(de)總功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)，稱之(zhi)為“視在(zai)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)”或“表現功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)”，在(zai)數值上是交流電(dian)路中電(dian)壓(ya)與電(dian)流的(de)乘積。視在(zai)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)用字母S表示(shi)，即S=U×I，單位是伏安（VA）或千伏安（KVA）。它通常用來表示(shi)交流電(dian)源設備(bei)（如變壓(ya)器）的(de)容量大小(xiao)。視在(zai)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)既(ji)不等于(yu)有(you)功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)，也不等于(yu)無功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)，但它既(ji)包含有(you)功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)又包含無功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)。能否使(shi)視在(zai)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)為800KVA的(de)變壓(ya)器輸(shu)出800KW的(de)有(you)功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)，主(zhu)要取決于(yu)負(fu)載的(de)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)因(yin)數。

除(chu)此之(zhi)外，還有一個諧(xie)波治理(li)的重要手段(duan)，那就是采(cai)用EMI電(dian)源濾波器(qi)。將其串聯或是并聯于主電(dian)路中(zhong)，實(shi)時從補償(chang)對象中(zhong)檢測出(chu)變頻器(qi)諧(xie)波電(dian)流(liu)(liu)，由補償(chang)裝置產生(sheng)一個與(yu)該變頻器(qi)諧(xie)波電(dian)流(liu)(liu)大小相等、方向相反的補償(chang)電(dian)流(liu)(liu)，從而使電(dian)網電(dian)流(liu)(liu)只含基波電(dian)流(liu)(liu)。