Transient Switching Study for 120 MVAr Variable Shunt Reactor at 220 kV Substation

This paper describes transients switching study carried out for variable shunt reactor (VSR) connected to 220 kV Grid at 220/33 kV Adani Electricity Mumbai Ltd (AEML) Gorai substation. The study model developed in the PSCAD. It includes a model for VSR, Sf6 CB, other substation equipments. Inrush currents due to uncontrolled switching and transient recovery voltage peak due to forced 5A current chopping corresponding to lowest 48 MVAr (40%) and highest 120 MVAr (100%) reactive power were determined. Based on the analysis, controlled switching device (CSD) was proposed for point on wave switching strategy for 120 MVAr VSR and operational methodology is devised.