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In-situ measurement of the current transformer burden in a current transformer testing system using a shunt resistor

機(jī)譯：使用分流電阻器在電流互感器測(cè)試系統(tǒng)中現(xiàn)場(chǎng)測(cè)量電流互感器負(fù)荷

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Both the ratio error and phase angle error of a current transformer (CT) are significantly affected by the CT burdenconnected in series to the secondary terminal of the CT. Thus, the precise measurement of this CT burden is required for the evaluation of the CT errors. A method for measuring the CT burden in-situ in a CT testing system (CTTS) has been developed by employing the non-reactive type shunt resistor. For the measurement of the CT burden, the shunt resistor was connected in parallel to the secondary terminal of the CT under test in the CTTS. The burden values represented by the apparent power and the power factor can be calculated from the resistance (and reactance), which was obtained by measuring the ratio error (and phase angle error) as a function of the resistance of the shunt resistor. The uncertainties in the measurements of the apparent power and the power factor for the rated burdens studied were found to be less than 2.1percent. The CT burden values obtained using our method were consistent with those measured using a digital multimeter within the corresponding uncertainties.
機(jī)譯：電流互感器（CT）的比率誤差和相角誤差都受到串聯(lián)連接到CT次級(jí)端子的CT負(fù)載的顯著影響。因此，需要對(duì)該CT負(fù)擔(dān)進(jìn)行精確測(cè)量以評(píng)估CT誤差。通過(guò)使用非電抗型并聯(lián)電阻器，已經(jīng)開(kāi)發(fā)出一種在CT測(cè)試系統(tǒng)（CTTS）中就地測(cè)量CT負(fù)荷的方法。為了測(cè)量CT負(fù)載，在CTTS中將并聯(lián)電阻并聯(lián)到被測(cè)CT的次級(jí)端子上。視在功率和功率因數(shù)表示的負(fù)荷值可以通過(guò)電阻（和電抗）來(lái)計(jì)算，該電阻是通過(guò)測(cè)量作為分流電阻器電阻的函數(shù)的比率誤差（和相角誤差）而獲得的。發(fā)現(xiàn)所研究的額定負(fù)荷的視在功率和功率因數(shù)的測(cè)量不確定度小于2.1％。在相應(yīng)的不確定性范圍內(nèi)，使用我們的方法獲得的CT負(fù)荷值與使用數(shù)字萬(wàn)用表測(cè)量的CT負(fù)荷值一致。

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