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Drydock 50 hz supply, ship 60 hz .What should be done

  •  50 Hz will make motors run slower. 50/60=83% that will have the effect on the efficiency and the connected load . 
  • If we supply a reduced frequency then we also need to reduce the voltage accordingly to prevent the motor to draw more current. 
  • Voltage/frequency of ship equals to Voltage/frequency shore. That’s gives us a calculated voltage of 366 volts, which closer to the standard 380 volts 50 Hz, that can be accepted. 
  • By doing so the through put of the pumps will be reduced, and we definitely have to keep an eye on the temperatures of the motor windings.

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