October 2020
Intermediate to advanced
450 pages
15h 32m
English
Content preview from Electrotechnical Systems
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292 Electrotechnical Systems
In the SM soft-start condition, its contactor K_.1 closes and after speeding up to
the synchronous speed, this contactor opens and the contactor K_.2 closes. For the
SM in the control mode, K_.1 remains closed. The synchronization of the inverter
voltage powering SM and the mains voltage must be carried out before the switching-
over. Since strict simultaneous commutation of the contactors is not possible, their
switching is possible only with the opening of both contactors for a short time or with
overlap when they are closed for a short time. Since in the rst case overvoltage is
possible when the SM circuit is inter ...
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