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7.5 Switching high-voltage motors
WOGeneric TEAAC / 2008
Siemens AG Operating Instructions 1.03 1RQ671...-Z 37
7.5 Switching high-voltage motors
Overvoltages resulting from switching operations
Regardless of the motor size and the arc-extinguishing principle of the switch being used
(i.e., even in the case of oil-free, SF6 or air break switches), you must bear the following in
mind when commissioning high-voltage motors/switchgear for high-voltage motors from 3 kV
to 13.8 kV:
CAUTION
Overvoltages caused by shutting down the motor during startup
Shutting down the motor during startup can cause overvoltages. This can damage the
motor.
Avoid shutting down the motor during startup by, for instance, checking for errors in the
starting control or for excessively sensitive protection settings. Keep shutdowns during
startup for checking the direction of rotation or other tests to an absolute minimum.
[ID 251.02]
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