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1、電流(liu)互感(gan)器二次所串聯的負荷如智能電(dian)表、電力表(biao)及繼電器的(de)電流(liu)(liu)線圈，阻(zu)抗(kang)很(hen)小(xiao)，因而電流(liu)(liu)互感器正常(chang)工作(zuo)近(jin)似短路狀(zhuang)態。

2、變壓器的(de)一次電(dian)(dian)流(liu)(liu)隨(sui)(sui)二次電(dian)(dian)流(liu)(liu)變化(hua)而變化(hua)，二次電(dian)(dian)流(liu)(liu)起主導(dao)作(zuo)(zuo)用(yong)；電(dian)(dian)流(liu)(liu)互感器的(de)一次電(dian)(dian)流(liu)(liu)決定(ding)于(yu)一次電(dian)(dian)流(liu)(liu)的(de)負荷，和(he)二次無關，二次電(dian)(dian)流(liu)(liu)決定(ding)于(yu)一次電(dian)(dian)流(liu)(liu)，所以是(shi)一次起主導(dao)作(zuo)(zuo)用(yong)。智(zhi)(zhi)能(neng)電(dian)(dian)能(neng)表(biao)作(zuo)(zuo)為電(dian)(dian)網(wang)(wang)的(de)入戶(hu)(hu)接(jie)口，一方面電(dian)(dian)網(wang)(wang)通(tong)(tong)過智(zhi)(zhi)能(neng)電(dian)(dian)表(biao)將安全、高質的(de)電(dian)(dian)能(neng)輸(shu)送到用(yong)戶(hu)(hu)的(de)用(yong)電(dian)(dian)設備上;而隨(sui)(sui)著新(xin)能(neng)源的(de)廣(guang)泛應用(yong)，許(xu)多分(fen)(fen)布式(shi)新(xin)能(neng)源，如(ru)風能(neng)、太陽能(neng)等，已經在(zai)用(yong)戶(hu)(hu)端得到了充(chong)分(fen)(fen)的(de)使用(yong)，這種(zhong)微型分(fen)(fen)布式(shi)能(neng)源也可以通(tong)(tong)過智(zhi)(zhi)能(neng)電(dian)(dian)表(biao)反饋到電(dian)(dian)網(wang)(wang)中，與電(dian)(dian)網(wang)(wang)實現并網(wang)(wang)。所以智(zhi)(zhi)能(neng)電(dian)(dian)表(biao)需要具備雙向電(dian)(dian)能(neng)傳(chuan)輸(shu)和(he)計量(liang)的(de)功能(neng)。

3、變(bian)壓(ya)器的主磁(ci)通決(jue)定(ding)于一次(ci)側所加的電壓(ya)，主磁(ci)通又決(jue)定(ding)了(le)二(er)(er)次(ci)電勢(shi)，因此，主磁(ci)通不(bu)變(bian)二(er)(er)次(ci)電勢(shi)也基(ji)本(ben)不(bu)變(bian)。電流(liu)(liu)互感(gan)器則不(bu)一樣，當二(er)(er)次(ci)回路(lu)阻(zu)抗(kang)變(bian)化(hua)時，二(er)(er)次(ci)電勢(shi)也會變(bian)化(hua)。在(zai)一次(ci)電流(liu)(liu)作用下，二(er)(er)次(ci)阻(zu)抗(kang)、勵磁(ci)電流(liu)(liu)、二(er)(er)次(ci)電勢(shi)和二(er)(er)次(ci)電流(liu)(liu)這幾個量(liang)是互為因果關系。

4、變壓器二(er)次(ci)(ci)負(fu)載增(zeng)加，對各個(ge)(ge)電(dian)(dian)量(liang)影(ying)響很大(da)；而(er)電(dian)(dian)流互(hu)感(gan)器二(er)次(ci)(ci)所(suo)串(chuan)(chuan)的電(dian)(dian)流線圈(quan)是其(qi)二(er)次(ci)(ci)負(fu)荷，因而(er)線圈(quan)阻抗很小，所(suo)以多串(chuan)(chuan)幾個(ge)(ge)或(huo)少串(chuan)(chuan)幾個(ge)(ge)對其(qi)二(er)次(ci)(ci)電(dian)(dian)流影(ying)響不大(da)。但這一結論(lun)只(zhi)使用于(yu)在電(dian)(dian)流互(hu)感(gan)器額定負(fu)荷內，一旦負(fu)荷增(zeng)大(da)超過(guo)準(zhun)確(que)都允許范圍內，也會影(ying)響二(er)次(ci)(ci)電(dian)(dian)流，且使誤(wu)差增(zeng)加到不能允許的程度。

電(dian)流互感器的等(deng)級(ji)分為(wei)0.2 0.5 1 3 10等(deng)五個(ge)等(deng)級(ji)。智能(neng)(neng)(neng)(neng)(neng)電(dian)能(neng)(neng)(neng)(neng)(neng)表(biao)作為(wei)電(dian)網的入(ru)戶(hu)(hu)接(jie)口(kou)，一方(fang)面電(dian)網通(tong)過智能(neng)(neng)(neng)(neng)(neng)電(dian)表(biao)將(jiang)安全、高質的電(dian)能(neng)(neng)(neng)(neng)(neng)輸送到用戶(hu)(hu)的用電(dian)設備(bei)上(shang);而隨著新能(neng)(neng)(neng)(neng)(neng)源(yuan)(yuan)的廣泛(fan)應用，許多分布(bu)式新能(neng)(neng)(neng)(neng)(neng)源(yuan)(yuan)，如風能(neng)(neng)(neng)(neng)(neng)、太陽能(neng)(neng)(neng)(neng)(neng)等(deng)，已經在(zai)用戶(hu)(hu)端得(de)到了充分的使用，這種微(wei)型(xing)分布(bu)式能(neng)(neng)(neng)(neng)(neng)源(yuan)(yuan)也(ye)可(ke)以(yi)通(tong)過智能(neng)(neng)(neng)(neng)(neng)電(dian)表(biao)反饋到電(dian)網中，與電(dian)網實(shi)現(xian)并網。所以(yi)智能(neng)(neng)(neng)(neng)(neng)電(dian)表(biao)需(xu)要具(ju)備(bei)雙向(xiang)電(dian)能(neng)(neng)(neng)(neng)(neng)傳輸和計量(liang)的功能(neng)(neng)(neng)(neng)(neng)。