Sensitivity analysis of TRV in TCSC compensated transmission lines during fault clearing by line CB

Thyristor controlled series capacitors (TCSC) are effective devices for transmission lines power delivery enhancement in power systems. Before installation of TCSCs, it is necessary to study side effects of their integration in power system. One of these studies is the effect of series compensation on transient recovery voltage (TRV) of line circuit breaker when clearing a fault. The amplitude and rate of rise of TRV are two parameters which can affect the CBpsilas capability to interrupt a fault current successfully. In this paper, first, different factors and conditions which can affect TRV in the line CB of a thyristor controlled series compensated transmission line, have been analyzed and then, the dependence of TRV on protective operation of TCSC in different fault conditions has been illustrated and discussed through simulation of a thyristor controlled series compensated transmission system in PSCAD/EMTDC program.