An experimental study of impulse voltage phenomena in a large AC motor

High voltage ac motors with ratings from a few hundred kW may, during normal operation, be subjected to steep-fronted impulse voltages which can be hazardous to the turn-to-turn insulation. The rise time of these impulse voltages can be as short as 0.2 microsecond. These problems were discussed by R. M. Sexton in a recent paper¹ where further references can be found.