Static electronic tap-changer for fast phase voltage control

Abstract

Industrial equipment such as speed drives, electronics, controls and robotics and computer and communication systems are affected by bad power quality. Voltage dips/sags can cause shutdown of whole plants or result in quality reductions. With an electronic tap-changer (DVR), most of the voltage dips can be avoided. The tap-changer can regulate voltage dips within one cycle to levels that maintain the equipment in good operation. Since static electronic tap-changers do not have moving parts in the current path only simple maintenance is required and there are almost no limitations in the number of operations during their lifetime. The tap-changer can be mounted on to a full transformer, an auto-transformer or a booster transformer in different current and voltage ratings to fit all utility demands.