摘 要：為確定互感器校驗儀差壓回路負荷對電磁式電壓互感器檢定結果的影響，在給出國內檢定規(guī)程對差壓回路負荷技術要求的基礎上，分析目前國內外常用的兩種不同互感器校驗儀的原理以及相應的差壓回路附加負荷計算過程。分析結果表明：若忽略電流極性指示器所消耗的容量，兩種互感器校驗儀差壓回路的容量相等；互感器校驗儀差壓回路附加負荷造成的測量誤差，取決于標準和被檢電壓互感器二次側阻抗壓降；采用0.002級雙級電壓互感器對0.01~0.05級電壓互感器進行檢定時，附加負荷造成的影響可忽略不計。
關鍵詞：電壓互感器；互感器校驗儀；差壓回路；附加負荷
文獻標志碼：A 文章編號：1674-5124（2015）12-0028-04
The study of the different loop for transformer test set and its additional load
ZHANG Jieliang， DONG Xiaolong， HUANG Hong， ZHAO Sikan
（Fujian Institute of Metrology，F(xiàn)uzhou 350003，China）
Abstract: In order to study the effects of differential circuit load for potential transformer（PT） on calibration results， two kinds of transformer test set with different principle and its calculating process are analyzed based on giving the technical requirements. The analysis results show that， differential circuit capacity of two kinds of transformer test set is equal if the current polarity indicator capacity consumed is ignored. Transformer test set additional load caused by differential circuit depends on the secondary side voltage drop of standard PT and PT under calibration. The effect of additional load is neglected when adopting double level PT with an accuracy of 0.002 to calibrate PT with an accuracy of 0.01 to 0.05.
Keywords: potential transformer； transformer test set； the differential loop； additional load
