We had a situation recently where a 1000 hp 11.5 kV induction motor (full voltage start) was burned up because someone accidently tried starting the pump while it was spinning backwards. The operator was switching from one pump to another and was trying to perform a backflush of the pump intake by leaving the outlet valve open and using system pressure to force debris from the river intake screen. The motor started spinning backwards and making noise, so he panicked and tried restarting the motor.
The motor protection relays are of the old mechanical type and I would like to replace them with newer electronic types. Does anyone have any reccomendations for motor protection relays that could incorporate back spin protection. I see a GE Multilin 369 relay that advertises back spin protection, anyone have any experience with this unit or other ideas. I plan on interlocking the oulet valve to the motor starter, but want a backup protection on backspin.
Thanks for your time!
The motor protection relays are of the old mechanical type and I would like to replace them with newer electronic types. Does anyone have any reccomendations for motor protection relays that could incorporate back spin protection. I see a GE Multilin 369 relay that advertises back spin protection, anyone have any experience with this unit or other ideas. I plan on interlocking the oulet valve to the motor starter, but want a backup protection on backspin.
Thanks for your time!