浅析电流互感器的应用

Application of Current Transformer

电流互感器是一种特殊变压器,主要用于将电力系统中的高电压大电流按一定比例转换成低电压、小电流,为测量装置和继电保护的线圈提供电流;实现对一次设备和二次设备的隔离。其工作原理和变压器相似,所不同的是在变压器的铁芯内,产生交变主磁通是由一次绕组两端所加的交流电压的电流产生。电流互感器主要用于将电力系统中的高电压大电流按一定比例转换成低电压、小电流,即不管一次侧电流有多大,二次侧一般都是5A。供给仪表、仪器、继电器等作为测量、保护用。

Current transformer, a kind of special transformer, is mainly used for converting the high voltage and high current in power system into low voltage and low current according to a certain proportion, and supplies current to the coil of measuring device and relay protection; it realizes the isolation between a device and the two device. The working principle is similar to the transformer; the difference is that in the core of the transformer, the alternating current AC voltage main magnetic flux is generated by a current in primary winding ends. The current transformer is mainly used for high voltage and high current in power system according to a certain proportion into low voltage, low current, no matter what the primary side current is, and the two sides are generally 5A. It is used for supplying instrument, relay protection as measurement and protection.