Limitation of transmission line switching overvoltages

In this paper switching overvoltages of an actual transmission line are studied. Simulations are executed using Electro Magnetic Transients Program. A comprehensive switching transient study is performed for the Azerbaijan province network in Iran. The purpose of this study is to determine the unnecessary pre-insertion resistors in the UHV network, since the new policy is to use pre-insertion resistors only when crucial. Among the case studies presented in this work, in one case pre-insertion resistor is not necessary. Also in other cases, it is possible to omit pre-insertion resistors, with the aid of some enhancement in the insulation withstand level.