PROTECTION SCHEME FOR FIXED SERIES COMPENSATING DEVICES USING MOV AND SPARK GAP

Increasing power demands globally need a scheme which will increase the transmission capacity of existing power transmission lines economically. Nowadays use of FSC (Fixed Series Compensation) has been turned into a common practice in power industries as a compensation device. In this paper, the FSCs behavior under different types of faults is simulated. Under faulty condition the FSC is subjected to the over-voltages. Many protection schemes for series capacitor under overvoltage condition are limited in terms of performance under different environmental conditions and also in terms of size. There is a need for environmentally robust and more compact in size equipment. In this paper, emphasis is given on the series capacitor protection. The effectiveness of the protection scheme, which is valid for different types of TL faults, is demonstrated by comparing the results. The simulation study for single phase and three phase to ground fault is carried out using MATLAB/Simulink.