Analysis and Control of Double-Stator Tubular Per turn-to-turn fault of a high-voltage motor which was
controlled by a vacuum contactor prompted this study. The study revealed
that a voltage escalation can certainly occur by the repetition of
re-ignitions as indicated by recent several papers,l, 2, but the cause of
the escalation is different from that reported. This paper presents a new
theory for the voltage escalation, makes clear the conditions for the
occurrence of the escalation, and leads to the conclusion that protectors
are indispensable in the application of the contactors to the
motor control circuit.
manent-Magnet Motor With Series Magnetic Circuit