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Motors with shaft power below and above 132kW?

asked Jul 13, 2014 in E&I by jakangaru (2,010 points)
Should all motors with shaft power below 132kW be supplied from the 400V, 50Hz (480V, 60Hz) Low Voltage (LV) system.

Likewise, should all motors with shaft power 132kW and above be supplied from the High Voltage (HV) system. Motors in the range of 132kW to 400kW may be supplied with 690V, 50Hz (600V, 60Hz).

1 Answer

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answered Jul 13, 2014 by wozniakmic (3,460 points)
Some motors with shaft power between 150 kW and 200 kW are required for black start and therefore must be fed from LV distribution system as HV distribution system will not be available at that time.  For consistency of design, all motors up to 200 kW will be fed from the LV distribution system. Motors between 150 kW and 200 kW shaft power should be provided with soft motor starters.