The series reactor passes through AC current and is an important supporting equipment for reactive power compensation devices in the power system. Its function is to be used in series with compensating capacitors to suppress harmonics, limit closing inrush currents and operating overvoltage, improve the voltage waveform of the system, protect capacitors, and increase the power factor of the power grid. It plays a significant role in the safe operation of power capacitors and other power equipment. Reactors with a typical reactance rate of 5-7% and a reactance rate of 13% are considered high inductance reactors.