The Simulation Analysis of Shunt Reactor Controlled Switching at 500 kV Network

Abstract

Switching transients are one of the major causes of excessive stresses on the power system equipments, switching apparatus and also create power quality issues along with mal-operation of protective relays. Shunt reactor switching (SRS) is performed to mitigate the Ferranti Effect at off peak hours & if done in an uncontrolled way may have severe consequences. SRS at peak of the source voltage waveform eliminated the inrush current and de-energization at zero crossing decreases the re-ignition or restriking overvoltage surges. This paper analyses the actual science behind point on wave controller (POWC) and its positive effect on power system equipment. A case study of 135 MVAR SRS, installed at 500 kV transmission substation Rahim Yar Khan, is carried out by using PSCAD/EMTDC®.