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    互感器校验仪差压回路的分析及其附加负荷推算

    2016-03-03 中国测试张杰梁, 董小龙, 黄 洪, 赵斯衎
     
    摘  要:为确定互感器校验仪差压回路负荷对电磁式电压互感器检定结果的影响,在给出国内检定规程对差压回路负荷技术要求的基础上,分析目前国内外常用的两种不同互感器校验仪的原理以及相应的差压回路附加负荷计算过程。分析结果表明:若忽略电流极性指示器所消耗的容量,两种互感器校验仪差压回路的容量相等;互感器校验仪差压回路附加负荷造成的测量误差,取决于标准和被检电压互感器二次侧阻抗压降;采用0.002级双级电压互感器对0.01~0.05级电压互感器进行检定时,附加负荷造成的影响可忽略不计。
    关键词:电压互感器;互感器校验仪;差压回路;附加负荷 
    文献标志码:A     文章编号: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,Fuzhou 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
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