Enhancement of Distance Relay Performance in Transmission Line Compensated by Series Capacitor Protected by MOV

The normal distance relay face many challenges in a series compensated transmission lines the distance relay may give incorrect decision. This paper present a digital distance relay designed by using wavelet transform (WT)  to work with this compensated transmission lines. The relay have another features to recognize between fault and disturbance cases , classify fault types and giving the trip signal to circuit breaker in a time less than period quarter. The relay has been tested for both simulation cases and practically cases by simulation transmission lines board in the lab. Index Terms: Distance relay , fault detection , Series-Compensated Lines Protect ion, wavelet transform, MOV