电力监测系统中的互感器暂态误差分析

TRANSFORMER'S TRANSIENT ERROR ANALYSIS ABOUT THE MONITOR SYSTEM OF ELECTRIC POWER

根据油田电力调度自动化的发展需求，分析了仪用变压器中的电流电压互感器的暂态转移误差，推出了有效值、平均值和最大值的表达形式．同时给出了暂态相角误差的表达式，分别对正弦波和非正弦波等作用时的情况进行了分析，并与稳态误差进行了比较。同时借助计算机仿真，描述了相角误差随时间、原边电路时间常数和负数变化而变化的趋势，转移误差和相角误差随时间增加而下降并趋向于双曲渐近线，随原边电路时间常数的增加而减小，随负数的增加而减小，还仿真了暂态误差与负载功率因数的关系，探讨了在电流电压互感器副边根据运行条件并接电容进行误差补偿的路径，指出了该类互感器的特点与应用条件，即副边负载最好是具有高欧姆值的现代电子系统。

According to the demand of dispatch automation for electric power in oilfields,thetransient shift error of current and voltage transformer in measuring process was analyzed inthis paper;in which expressions of effective value,average value and maximum value weregiven;the expression of transient phase angle’s error was shown as well; then the stablevalue was compared with them. At the same time,having the aid of computer simulation,the paper describes the varying error’s tendency of the phase angle as time changing,shifterror and phase angle error decrease and tend to hyperbola with time increasing, decreasewith current time constance of primary winding, reduce with load increasing. The relationbetween transient error and load power factor has been simulated, having approached theway to error compensation by parallel capacitor in secondary winding according to operatingconditions,and points out the characteristics and applying conditions about the kind oftransformer,i.e. it is more ideal for load in secondary winding to be modern electronic sys-tem with high resistance in the end