SVC fully automatic AC voltage stabilizer consists of contact voltage regulator, automatic control circuit and servo motor and so on. It has excellent features, such as small waveform distortion, high efficiency, and high power factor, free from the effect of frequency variation of supply. when the voltage of the network is not steady or the load varies, the automatic sampling control circuit makes a signal to drive the servo motor to adjust the position of carbon brush of the self-coupling voltage regulator so as to have output voltage regulated to the rating and to obtain the steady state. It can be widely
used in most situations where the voltage stabilization is required.