什么叫电流互感器
由于电流互感器通常具有线路的整体电流流量，二次绕组数目较多，二次电流互感器在测量仪器和保护电路中连接，二次侧电路在电流互感器工作时总是关闭，因此测量仪器和保护电路的阻抗很小，电流互感器接近短路。变流器将一次侧大电流转换为二次侧小电流进行测量，二次侧不能开放。
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