Meshed transmission lines provide redundancy which aid in th

Meshed transmission lines provide redundancy which aid in the reliability of the electric system. If a transmission line in a large interconnected system is tripped open by the removal of a fault or other contingency along the line the method of removal of this contingency is the opening of circuit breaker on each end of the transmission line. Such action completely isolates the contingency no matter where the contingency exists along the line and no matter whether the contingency remains after both ends of the line are opened. Now let\'s revisit the large interconnected transmission system. We will now state that a contingency exists (of what kind we do not know or care) and the line is removed from service (both ends of the line are opened). A) What happens to the load assuming all loads arc constant power? B) A second question is what happens to the systert as far as reliability is concerned? C) Finally what in general happens to the sources as a whole that feed these consta

Solution

A) If we are performing above isolation process irrespective of fault positions,Loads get Interrupted irrespective of Fault positions

B) The Reliability of system is lost becuse irrespective of fault location all system is gets isolated from supply,hence we can use Zone Protection schemes to avoid this problem

C)Sources gets damaged due to sudden opening of Circuit Breakers there is developement of Huge Open_Circuit Voltages in the system