Comparative analysis of influences of TCSC and FSC on protective relaying for transmission line

s:Based on the analysis of running mode,action after fault,dynamic power frequency impedance of TCSC(Thyristor-Controlled Series Capacitor) and compared with FSC(Fixed Series Compensation),the influence of TCSC on distance protection,direction component and pilot protection are analyzed. Protective relaying for lines with FCS may run well on lines with TCSC,and its protective performance will not become worse.