Transient analysis of power line/cable systems. Including reactive terminations with surge diverters

Fault-limiting inductors have been found to be the cause of flashover on certain transmission systems, and the proposal to employ them on projected installations therefore raises the question of the magnitude of the transient overvoltages to be expected when the system is energised by various switching arrangements. The paper presents the results of digital-computer studies on a number of systems, existing and proposed, and it is shown that, where flashover has occurred, this could have been predicted at the design stage. The computer program developed for these studies is quite general, and will deal with any cascade combination of lines and cables, as well as allowing for precharge on the line and the nonlinear characteristics of a surge diverter if sparkover occurs. It is also indicated how a closed form of solution may be obtained from a knowledge of the eigenvalues and eigenvectors of the system matrix, and how the contributions of the separate modes to the overall response may be isolated.