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A thyristor-controlled series capacitor (TCSC) is an effective device that adjusts impedance through thyristor control to increase power transfer capability in a transmission line. It has so many advantages such as system reliability and power transmission capability improvement. However the application of series compensator in power system can affect other devices such as circuit breakers. In this paper, we analyze the transient recovery voltage (TRV) effect of a line circuit breaker in the cases with and without TCSC via simulation, and suggest an effective method to overcome the increase of TRV due to the TCSC installation. Also, the effectiveness of the bypass method on a metal oxide varistor (MOV) was demonstrated. A 345 kV transmission line in Korea was selected as a study case. Grid system including transmission lines, detailed TCSC models, circuit breakers, and nearby power stations were modelled using …