Abstract
This paper describes transients caused by uncontrolled and controlled switching of three-phase 420kV variable shunt reactor (VSR). The model for the analysis of the transients caused by switching of VSR was developed in the EMTP-RV software. It includes a dynamic electric arc in SF6 circuit breaker and the model of substation equipment. Inrush currents due to VSR energization and overvoltages due to de-energization were determined at tap positions corresponding to lowest 80MVAr and highest 150MVAr reactive power. Based on the calculation results, mitigation measures and operating switching strategy of VSR were proposed.
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