Phase-Phase Switching Surges on 500-kV Transformer-Terminated Lines, Part II: Switching from Low-Voltage Terminals

The effects of system parameters and transformer sizes on phase-phase switching surges on 500-kV autotransformer- transmission line combinations when switched through the auto- transformer were investigated on a transient network analyzer. The results of the study are presented, including surge magnitude, waveshapes, and the line-neutral polarity components comprising the phase-phase surges. Phase-phase switching-surge frequency of occurrence data are illustrated.