Analysis of Single Phase Switching Field Tests on the AEP 765 KV System

Single phase switching compensation schemes for untransposed transmission lines were tested during staged fault tests on a 243 km 765 kV line. A large range Of single phase switching parameters was simulated during the tests by intentional variations of the secondary arc current and the recovery voltage on the opened phase. In 27 single phase switching tests the 60 Hz component of the secondary arc currert Was varied from 8 A rms to 80 A rms. The rate of rise of the withstand voltage for a simulated 765 kV air gap was obtained. The harmonic content of the secondary arc current was analyzed.