APPLICATION OF SILICON CONTROLLED RECTIFIERS FOR H.V.D.C. TRANSMISSION

Abstract

With the advent of thyristor In early sixtses, the controlled mercury arc valves have been replaced by thryiators in d*c. transmissIon and in all other Industrial arpplications$ since thyristors do not suffer from transient faults such as are back they do not have critical lower temperature limit and they can be Installed in such light screened enclosu ► than with mercury are valvas* A brief review of the existing work Connected with silicon controlled r. of er,thoory of silicon controlled rectifier, -different typos of valv ► arrangements for H.V.D, -*,.. constant current and constant extinction angle control, a now ale ph t + control and corresponding 3phas. caries convertor have been presented in this dissertation. The experimental Oat up using aingla phase bridge recti ier and a three phase bridge rectifisr with constant ev en : control$ to keep the current within the prescribed limit and a constant extinction angle control circuit for inversion for saximur uttileatton of invertor capacity and ainimn c nsumption of reactive power demand is made with CR and tasted.