, Danish Chaudhary

Abstract-- High voltage transmission is employed to transfer the bulk power from sending end to receiving end with lesser losses. Generally power is transferred in ac because of the feasibility in stepping up the voltage and stepping down. However with increase in voltage levels beyond 400kV ac EHV transmission has certain disadvantages such as corona loss, insulation requirement for conductor, radio interference and heavy supporting structures. Therefore for transmission with EHV voltages HVDC transmission is economical. This paper discuss that how HVDC plays a vital role in power system development. This paper includes introduction of HVDC, layout, applications and advantages of HVDC. The aim of this paper is to review the merits of HVDC over EHVAC