The Computer Analysis of Switching Transients Involving ARC Model

Abstract

The objective of this paper is to study the relevance of computerised modelling technigues to the solution of switching transients involving dynamic arc. The system is to be represented by a set of mathematical equations by the Rung-Kutta-England numerical technique and the nonlinear dynamic arc model is to be used as the circuit element. The work is concerned with the analysis of the transient recovery voltage (TRV) created by th^ cable-connected busbar fault current interruption in distribution system. In this paper, a new analytical method has been developed for solving this problem: the modified DOMMEL method. The TRV in the I.E.C. standards was compared with the more accurate simulation developed in this paper for the case of the cable-connected bus fault. In particular, the wave form of the TRV is similar to that of the short line fault on the transmission line which imposes a severe duty on the circuit breaker due to the high initial rate of rise of the voltage across the circuit breaker. The results indicated large differences and it issuggested that the I.E.C. standard needs modification.