Energizing high and extra-high voltage lines during restoration

In energizing transmission lines, operators are often concerned with: the l ength of line to be energized, the adequacy of on-line generation, and the size of underlying load. There has been a need for a simple methodology to readily address these issues and provide guidelines for the safe operation of high voltage and extra-high voltage transmission lines. In this paper, a simple and approximate approach for evaluating sustained a nd transient voltages is presented. The sending- and receiving-end sustaine d and transient voltages are determined for energizing lines of different v oltage levels and lengths, energized by different sizes of generators, and having different sizes of underlying loads.