Installation, testing and maintenance of protection systems

Abstract

Although the aim of this book is to provide the basis to guarantee a suitable relay setting procedure in distribution networks, it is felt that some reference should be made to the installation, testing and maintenance of protection systems. No matter how well the relay applications are carried out, a protection scheme is worthless if its actual performance cannot be guaranteed. It is important to emphasise that a protection scheme covers not only the relays but also the CTs and VTs that feed them, and the circuit breakers that open the circuits on receipt of a trip signal from the relays when a fault occurs.