Capacitor compensation in the capacitive reactive power of time, often by harmonic current, inrush current and operating voltage, resulting in reduced capacitor damage and power factor. Therefore, it is necessary to in front of capacitor installation of series reactor, to suppress and absorb harmonic, capacitor protection, avoid the influence of harmonic voltage and current and impact current and voltage, improve the power can improve the quality of the power factor of the system and to prolong the service life of the capacitor.