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當多(duo)(duo)功(gong)(gong)能電力儀(yi)表出現有功(gong)(gong)功(gong)(gong)率P值為(wei)負數，電能、功(gong)(gong)率及(ji)功(gong)(gong)率因(yin)數計量錯誤的現象時(shi)判(pan)斷是否多(duo)(duo)功(gong)(gong)能儀(yi)表端接線故障正常情況下，多(duo)(duo)功(gong)(gong)能電力儀(yi)表的相序為(wei)：Ua-Ia;Ub-Ib;Uc-Ic。

若(ruo)出現有(you)功(gong)率(lv)為負(fu)值，功(gong)率(lv)因數、電(dian)(dian)能計(ji)量錯誤的現象，首先檢驗多功(gong)能電(dian)(dian)力儀表接線(xian)端的相(xiang)序接線(xian)是(shi)否正(zheng)(zheng)確。若(ruo)相(xiang)序錯誤，請(qing)斷(duan)電(dian)(dian)重新接線(xian);若(ruo)相(xiang)序正(zheng)(zheng)確，而儀表數據顯示異常，請(qing)查看(kan)電(dian)(dian)流互感器(qi)二次側進(jin)出線(xian)是(shi)否接對(dui)。

判斷是否(fou)二次側電(dian)流互感器進出(chu)線接線故障

多功(gong)能電力儀表(biao)如果(guo)出現有功(gong)功(gong)率(lv)P值為(wei)負數，電能、功(gong)率(lv)及功(gong)率(lv)因(yin)數計量(liang)錯誤的這些現象時，我們(men)首先排除是否是電力儀表(biao)進(jin)(jin)線(xian)(xian)(xian)段(duan)接(jie)線(xian)(xian)(xian)故障。如若儀表(biao)進(jin)(jin)線(xian)(xian)(xian)端接(jie)線(xian)(xian)(xian)正(zheng)(zheng)常(chang)(chang)，我們(men)檢測二次側電流(liu)(liu)互感器是否接(jie)線(xian)(xian)(xian)正(zheng)(zheng)常(chang)(chang)。正(zheng)(zheng)常(chang)(chang)情況下電流(liu)(liu)互感器進(jin)(jin)出線(xian)(xian)(xian)接(jie)法:Ia+進(jin)(jin)線(xian)(xian)(xian)、Ia-出線(xian)(xian)(xian);Ib+進(jin)(jin)線(xian)(xian)(xian)、Ib-出線(xian)(xian)(xian);Ic+進(jin)(jin)線(xian)(xian)(xian)、Ic-出線(xian)(xian)(xian)。

如果電流互(hu)感器二次側接(jie)線(xian)故障，會出現下列現象：

(1)有功功率為負

(2)電能計量異常

(3)功率因數異常

2.多(duo)功(gong)能電力(li)儀表三相電壓，三相電流，三相有功(gong)功(gong)率，功(gong)率因數，顯示正常，電能計量不正常

如果發生上(shang)述情(qing)況，首(shou)先要查看(kan)電(dian)(dian)流(liu)(liu)互感器(qi)二次側(ce)的三相(xiang)電(dian)(dian)流(liu)(liu)的流(liu)(liu)入(ru)與流(liu)(liu)出(chu)的接線(xian)(xian)是否都接反，因(yin)為(wei)電(dian)(dian)流(liu)(liu)從互感器(qi)二次側(ce)接線(xian)(xian)到儀表上(shang)，分為(wei)高低端，即流(liu)(liu)入(ru)與流(liu)(liu)出(chu)。

3. 三相電壓，三相電流，顯示(shi)正(zheng)常。三相有功(gong)功(gong)率，功(gong)率因數，電能計量，顯示(shi)不正(zheng)常

首先(xian)檢查(cha)(cha)一下(xia)電(dian)(dian)流(liu)互感器二次側(ce)過來的(de)(de)(de)(de)(de)三相(xiang)(xiang)(xiang)(xiang)電(dian)(dian)流(liu)的(de)(de)(de)(de)(de)流(liu)入與流(liu)出(chu)的(de)(de)(de)(de)(de)線是否接(jie)反(fan)，如(ru)(ru)果電(dian)(dian)流(liu)流(liu)入與流(liu)出(chu)都接(jie)反(fan)，則電(dian)(dian)能計量(liang)在EP-;如(ru)(ru)果有其中(zhong)一相(xiang)(xiang)(xiang)(xiang)或二相(xiang)(xiang)(xiang)(xiang)接(jie)反(fan)，則有功(gong)(gong)功(gong)(gong)率會抵消，這樣有功(gong)(gong)功(gong)(gong)率就會偏小(xiao)，有功(gong)(gong)功(gong)(gong)率偏小(xiao)電(dian)(dian)能計量(liang)也就偏小(xiao)。同(tong)時查(cha)(cha)看電(dian)(dian)流(liu)互感器過來的(de)(de)(de)(de)(de)接(jie)線相(xiang)(xiang)(xiang)(xiang)序位置是否有錯位，如(ru)(ru)：A相(xiang)(xiang)(xiang)(xiang)電(dian)(dian)流(liu)互感器的(de)(de)(de)(de)(de)二次側(ce)線接(jie)到(dao)了儀(yi)表的(de)(de)(de)(de)(de)Ib相(xiang)(xiang)(xiang)(xiang)輸入端，或B相(xiang)(xiang)(xiang)(xiang)互感器二次側(ce)的(de)(de)(de)(de)(de)線接(jie)到(dao)儀(yi)表的(de)(de)(de)(de)(de)Ic相(xiang)(xiang)(xiang)(xiang)輸入端等。同(tong)時查(cha)(cha)看三相(xiang)(xiang)(xiang)(xiang)電(dian)(dian)壓(ya)UA UB UC UN的(de)(de)(de)(de)(de)接(jie)線是否正(zheng)確，如(ru)(ru)：線路UA接(jie)到(dao)儀(yi)表UB，線路UB接(jie)到(dao)儀(yi)表UC，等。

如果有以上接錯(cuo)情(qing)況(kuang)，那有功功率(lv)顯示就會不準確，這樣電能計量也會不準確。