Overvoltages Due to Line Energization and Reenergization Versus Overvoltages Caused by Faults and Fault Clearing in EHV Systems

One of the main problems in EHV and UHV systems is the control of transient overvoltages of internal origin. The first part of this paper investigates different approaches to limit over- voltages due to line energization and reenergization; the second part deals with fault and fault-clearing overvoltages. Finally, the relative severity of the former type of overvoltage versus the latter in EHV and UHV systems is compared.