460v vs 480v

[jeralle]

what are the affects of changing my incoming supply voltage of 480v to 460v( because my motors are rated at 460v.).understanding that there is +/-10% of the rated nominal voltage???

 

[malcolmsanford]

Where are you? Country wise

 

[Darkwood]

???? dont understand what you are really asking?
What are the effects on what?....... the motor?, other items on same supply etc
If you are altering the voltage with a transformer you only need to do it at the point of the machine or motor where the voltage is mismatched to your supply, if you do it at the origin of the supply you will spend alot of money on a bigger transformer for no reason and may undervoltage certain items for which you havent supplied any information.

 

[bomjac]

Speak to the maker of your motors first of all. Chances are that the motors are actually suitable for both voltages and the maker can issue you with new data plates to cover the revised voltage.

As to running currents, for a motor running on 480V vs 460V, when running at the lower voltage the motor will draw a little extra current as to when on 480V (at the end of the day, the driven load still requires the same amount of power, so the motor has to work that little bit harder) - a 10 amp motor @ 480V will require 10.4A at 460V for the same driven load

 

[jeralle]

Usa, guam

 

[jeralle]

I'm just doing research for my company they were advised that we need to change incoming supply voltage(power company will retap the transformer) due to the fact that our motors are rated at 460v.i'm an electrcian in training and according to my book(trade school) motors are most efficient at rated voltage,also understanding that manufactures under rate motors as an assumption that there will be a 20 volt drop from the transformer to the motor terminals.i'm getting 477v 478v 477v at the motor terminals. with the +/- 10% (414v-506)of rated voltage im still in the allowable operating range. so if i was to drop the voltage what affects will happen to the motor???

 

[Frenchsparky]

I will post it here due I am famauir with Americiane system so therefore the 480 volt supply is perfectly fine for your 460 volt motor and it been that way due the NEMA have diffefernt voltage rating than what the supply will be and if you want more details let me know I will post few differnt examples.

Merci,
Marc