Oversized motor protection
Oversized motor protection
(OP)
My company has plans to repurpose an existing 4 kV, 700 hp motor presently driving a 700 hp centrifugal water pump. The existing pump is being replaced with a smaller pump that requires only about 300 hp. What changes in the motor's existing protective relay settings, if any, would be customary for this arrangement?





RE: Oversized motor protection
The original recommended settings should be satisfactory. However it may be well to check that the settings have not been changed over the years.
Bill
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"Why not the best?"
Jimmy Carter
RE: Oversized motor protection
"Will work for (the memory of) salami"
RE: Oversized motor protection
To be clear, in the old system if you went open channel, the motor would almost immediately overload and the protection relay would shut the pump down in enough time to avoid collateral damage. In the new setup, the motor is now so much bigger that this will not happen for a much much longer time, long enough to expose the entire pumping system to dangerous conditions.
"Will work for (the memory of) salami"
RE: Oversized motor protection