CKSC type dry iron core series reactor is an important supporting equipment for reactive power compensation device of power system. After the power capacitor is connected in series with the dry-type iron-core reactor, it can effectively suppress the high-order harmonics in the power grid, limit the closing inrush current and operating overvoltage, improve the voltage waveform of the system, improve the power factor of the power grid, and reduce the impact of power capacitors and other power The safe operation of the equipment plays a big role.