电流互感器误差分析
Error analysis of current transformer
1、比差和角差是测量用电流互感器的主要特性，而饱和系数则是继电保护用互感器的主要特性。
1. Ratio difference and angle difference are the main characteristics of current transformer for measurement, while saturation coefficient is the main characteristics of relay protection transformer.
2、二次线圈的内阻和漏抗、二次线圈的匝数，铁芯的导磁性能、铁芯的截面是影响电流互感器误差的内部因素；二次电流、二次负载的大小和功率因数以及频率是影响电流互感器误差的外部因素。
2. The internal resistance and leakage reactance of the secondary coil, the number of turns of the secondary coil, the magnetic conductivity of the iron core and the cross section of the iron core are the internal factors that affect the error of the current transformer; the size of the secondary current, the secondary load, the power factor and the frequency are the external factors that affect the error of the current transformer.
3、测量用电流互感器在选用时通常不进行误差校验，只在产品设计或运行时进行误差计算或误差测试；选用设计时一般根据其准确度等级和二次负载选择二次连接导线截面，保护用电流互感器一般按10%误差曲线（或伏安特性曲线）进行误差校验或短路电流倍数和二次连接负载的校验。
3. The current transformer for measurement usually does not carry out error verification when it is selected, but only carries out error calculation or error test when the product is designed or running; the secondary connecting wire section is generally selected according to its accuracy level and secondary load when it is selected and designed, and the error verification or short-circuit current multiple and secondary are generally carried out according to the 10% error curve (or volt ampere characteristic curve) for the current transformer for protection. Verification of secondary connection load.