按照用途不同，电流互感器大致可分为两类： According to the use, current transformer can be divided into two types: 测量用电流互感器（或电流互感器的测量绕组）：在正常工作电流范围内，向测量、计量等装置提供电网的电流信息。 Measuring current transformer (or measuring winding of current transformer) : within the scope of the normal working current, provide measurement, metering device grid current information. 保护用电流互感器（或电流互感器的保护绕组）：在电网故障状态下，向继电保护等装置提供电网故障电流信息。 Protection of current transformer (or current transformer) : to provide power grid fault current information to relay protection and other devices in case of power grid failure. 测量用电流互感器 Measuring current transformer 电流互感器 Current transformer 在测量 交变电流的大电流时，为便于 二次仪表测量需要转换为比较统一的电流（中国规定电流互感器的二次额定为5A或1A），另外线路上的电压都比较高如直接测量是非常危险的。电流互感器就起到变流和 电气隔离作用。它是电力系统中测量仪表、继电保护等 二次设备获取电气一次回路电流信息的传感器，电流互感器将高电流按比例转换成低电流，电流互感器一次侧接在 一次系统，二次侧接测量仪表、继电保护等。 In the measurement of alternating current high current, for ease of secondary instrument measuring need into a more uniform current (China regulations of current transformer secondary rated as 5 a or 1 a), the other on a line voltage is higher, such as direct measurement is very dangerous. Current transformer ACTS as transformer and electrical isolation. It is a measuring instrument, relay protection in power system, etc Secondary device for electric a loop current information of sensors, current transformer to convert high current in proportion to the low current, current transformer primary side in a system, secondary side by measuring instrument, relay protection, etc. 正常工作时互感器二次侧处于近似短路状态，输出电压很低。在运行中如果二次 绕组开路或一次绕组流过异常电流（如 雷电流、谐振过电流、电容充电电流、电感启动电流等），都会在二次侧产生数千伏甚至上万伏的过电压。这不仅给 二次系统绝缘造成危害，还会使互感器过激而烧损，甚至危及运行人员的生命安全。 The secondary side of the transformer is near short circuit in normal operation, and the output voltage is very low. If the secondary winding open or in running a winding through the abnormal current (such as lightning current charging current, harmonic current, capacitance and inductance starting current, etc.), will create a few kv in secondary side or even tens of thousands of volts overvoltage. This not only causes the damage to the secondary system insulation, but also causes the transformer to overheat and damage the life safety of the operator.