When compensating for capacitive reactive power, capacitors are often affected by harmonic currents, closing inrush currents, and operating overvoltage, resulting in capacitor damage and reduced power factor. Therefore, a series reactor needs to be installed at the front end of the capacitor to resist and absorb harmonics, protect the capacitor, avoid the impact of harmonic voltage and impulse voltage currents, improve power quality, improve system power factor, and extend capacitor life, Ensure the safe operation of the power grid