Two novel schemes suitable for static switching of 3 phase delta connected capacitor banks with minimum surge current

Abstract

Delta connected capacitor banks are used for power factor improvement of balanced three-phase loads (e.g. three-phase induction motors etc.) and are normally switched in and out using antiparallel thyristors. The paper describes two new schemes for switching delta connected capacitor banks. While the first scheme can be readily used for existing delta connected capacitor banks, the second scheme can switch in and out delta connected capacitor banks very fast and hence is suitable for SVC applications.