Most studies in relay coordination have focused solely on coordination of overcurrent relays while distance relays are used as the main protection of transmission lines. Since, simultaneous coordination of these two types of relays can provide a better protection, in this paper, a new approach is proposed for simultaneous coordination of distance and directional overcurrent relays (D&DOCRs). Al...

To secure the transmission lines against power system faults, distance relays are mostly used. Distance relay has its own Resistance (R)–Reactance (X) characteristics. Co-ordination of different is necessary for fast operation circuit breaker. Various which being tripped with respect to breakers attached at individual buses faraway from each other. These will be operated between occurred fault ...

Objective: This paper presents a qualitative comparison of different recently proposed network protection schemes that are based on the distance function. From this comparison, possible opportunities identified to develop strategies oriented towards protecting active distribution systems. Methodology: research is carried out in two parts: first identify fundamental theoretical aspects protectio...