电压互感器
Voltage transformer
测量用电流互感器主要与测量仪表配合，在线路正常工作状态下，用来测量电流、电压、功率等。测量用微型电流互感器主要要求： 1.绝缘可靠，2.足够高的测量精度，3.当被测线路发生故障出现的大电流时互感器应在适当的量程内饱和（如500%的额定电流）以保护测量仪表。保护用电流互感器保护用电流互感器主要与继电装置配合，在线路发生短路过载等故障时，向继电装置提供信号切断故障电路，以保护供电系统的安全。保护用微型电流互感器的工作条件与测量用互感器完全不同，保护用互感器只是在比正常电流大几倍几十倍的电流时才开始有效的工作。
The current transformer for measurement is mainly used to measure current, voltage, power, etc. under the normal working condition of the line. The main requirements of micro current transformer for measurement are as follows: 1. Reliable insulation; 2. High enough measurement accuracy; 3. In case of large current due to fault of the measured line, the transformer shall be saturated in appropriate range (such as 500% rated current) to protect the measuring instrument. The current transformer for protection mainly cooperates with relay device to provide signal to the relay device to cut off the fault circuit in case of short circuit and overload of the line, so as to protect the safety of power supply system. The working conditions of the protection micro current transformer are completely different from the measurement transformer. The protection transformer only works effectively when the current is several times and dozens of times larger than the normal curren