Computation & control of transient voltages in power system using laplace transform

Abstract

With the recent developments and improvements in Extra High Voltage (EHV), circuit breakers, over voltages caused by energisation or de-energisation of lines can be made so low that the limiting factor determining the reduction in the line insulation might be considered the overvoltage produced by single line-to-ground faults. On lines insulated for levels below twice the normal line-to-ground crest voltage, such faults could develop into double line-to-ground faults, which would be particularly objectionable if single-pole switching were to be employed. This paper presents a mathematical analysis of transient due to fault initiation at any point on the double circuit Extra High Voltage transmission system, using the Fast Fourier Transform technique.