Selective-pole switching of long double-circuit EHV line

Abstract
This paper develops the joint use of several new concepts for improving stability, reliability, and safety of a double-circuit three-phase EHV line: 1. Use of selective-pole switching; that is, only the faulted conductors are opened and reclosed. 2. Exclusive use of that arrangement of conductors that gives the least current to ground from a large vehicle capacitively coupled to the line: like phases are in diagonally opposite positions. 3. Use of bank of 3 shunt capacitors and 9 shunt reactors for neutralizing the 15 interconductor capacitances and thereby eliminating the shunt capacitive coupling that tends to maintain the secondary fault arc. 4. Sectionalizing the faulted conductor or conductors into two or more longitudinal sections by remote-controlled switches in order to reduce the longitudinal resistive-inductive coupling that also tends to maintain the secondary fault arc. These concepts are illustrated by applying all of them to a simulated 735-kV, heavily loaded, 200-mile line having 6 bundles of 4 Chukar conductors each.

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