电流互感器原理是依据电磁感应原理制成的。电流互感器是由闭合的铁心和 绕组组成。它的一次侧绕组匝数很少，串在需要测量的电流的线路中，因此它经常有线路的全部电流流过，二次侧绕组匝数比较多，串接在测量仪表和保护回路中，电流互感器在工作时，它的二次侧回路始终是闭合的，因此测量仪表和保护回路串联 线圈的阻抗很小，电流互感器的工作状态接近短路。电流互感器是把一次侧大电流转换成二次侧小电流来测量 ，二次侧不可开路。 The principle of current transformer is based on the principle of electromagnetic induction. A current transformer consists of a closed core and winding. It's a little winding circle number, string in the current need to measure the line, so it often have all the current flows through the line, the secondary winding circle number is more, concatenated in measuring instrument and protection circuit, current transformer at work, its secondary side circuit is always closed, so the measuring instrument and protection circuit in series with the coil impedance is very small, the working state of the current transformer is close to a short circuit. A current transformer is a measurement of a large current converted into a secondary small current, which is not available on the secondary side.