Digital computer computation and analysis of gas insulated substation overvoltages

Abstract

A gas insulated substation can be subjected to a high amplitude of overvoltages as a result of lightning strokes striking the substation. This can cause a back flashover failure, which will damage the equipment and devices in the substation if these overvoltages are allowed to exceed those that the devices can withstand. In this study, an investigation of the overvoltages in a gas insulated substation as a result of a back flashover, with the variation of some different parameters, is conducted using a digital computer so that the substation performance can be determined under these conditions. This is very useful for determining the protection level and method of the gas insulated substation.