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互感器的主要作用有： The main functions of the transformer are: （1）将高电压变为低电压（100V），大电流变为小电流（5A，1A）。 (1) turn the high voltage into low voltage (100V), and the large current becomes small current (5A, 1A). （2）使测量二次回路与一次回路高电压和大电流实施电气隔离，以保证测量工作人员和仪表设备的安全。 To ensure the safety of the measuring staff and instrument equipment by measuring the electrical isolation of the secondary circuit and the high voltage and high current of the circuit. （3）采用互感器后可使仪表制造标准化，而不用按被测量电压高低和电流大小来设计仪表。 (3) the instrument can be standardized by means of mutual inductor, without measuring the voltage and current size of the instrument. （4）取出零序电流、电压分量供反应接地故障的继电保护装置使用。 (4) the relay protection device for the fault of the ground fault of the zero sequence current and the voltage component.