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电流互感器的原理
1）作用
(1) 将一次系统各回路大电流变为二次侧的5A或1A、0.5A以下的小电流，以便于测量仪表及继电器的小型化、标准化；将一次系统与二次系统在电气方面隔离，同时互感器二次侧须有一点可靠接地，保证二次设备及运行人员的安全；使二次系统（测量和保护装置）脱离一次系统成为独立的系统。
A small current of 5A or 1A, under 0.5 A, which will be converted into A second side of the system in order to measure the miniaturization and standardization of instruments and relays. To separate the system from the secondary system in electrical, and the secondary side of the transformer must have a reliable grounding to ensure the safety of the secondary equipment and operators. Make the secondary system (measurement and protection) separate from a system.
（2）工作状态
(2) working conditions
电流互感器是一种特殊的变压器，它正常工作时，因为负载阻抗值很小，在接近短路状态运行，因而成为变流器。
Current transformer is a special type of transformer, which normally works because the load impedance is very small, which is close to short circuit and becomes a current transformer.
（3）结构
(3) structure
电流互感器与单相变压器相似，由一、二次绕组及铁芯构成，但其一次绕组的匝数N1很少，一般只有一匝或几匝，而且是串在一次主回路中，而二次绕组的匝数N2较多。
Current transformer is similar to single-phase transformer, consists of the primary and secondary windings and iron core, but the number of turns of the primary winding N1 is small, usually only a turn or a few turns, and is a string in a main circuit, and the number of turns of the secondary winding N2.
（4）电气原理
(4) electrical principle
（5）注意：在运行中的电流互感器二次回路严禁开路；二次侧一端可靠接地和接线时注意极性。
(5) note that the secondary circuit of current transformer in operation is strictly forbidden. The second side is reliable grounding and the polarity of the connection.
（6）接线方式
(6) connection mode
（7）电流互感器的准确级：电流互感器的准确级就是其最大允许电流误差的百分值。准确级可分为0.2、0.5、1.0、3、10及保护级。
(7) the exact level of current transformer: the exact level of current transformer is the maximum permissible value of the current error. The exact level can be divided into 0.2, 0.5, 1.0, 3, 10, and protection.
