416 volt Generator ?

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augie47

augie47

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Electrician procured a generator to operate a 30HP 460v motor. Nameplate shows an output of 416 volts. Ever see such ??

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416V wye would be 240V-N, basically double a 208y/120V system. I suppose if you only had 230/240V loads or were overseas that would be helpful. But no, never seen that before.
 
Note that the generator is three phase but does not seem to specify delta or wye.
My guess is that it can be wired for 208Y/120 or 416Y/240.
Or maybe just the corresponding delta configs with no neutral brought out.
Anyway, I think that is why the unfamiliar 416V turns up.

mobile
 
Arent all generators like this 12 lead and one can select a variety of output voltages and configurations? My money being that you can get 120/208 out of that thing with the right adjustments.
 
mbrooke said:
Arent all generators like this 12 lead and one can select a variety of output voltages and configurations? My money being that you can get 120/208 out of that thing with the right adjustments.
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I agree that is a possibility, but also would think the base voltage across any one of the individual coils would be about 120 volts from there you can tweak the regulation a little to obtain the necessary 138.5 to put two in series to get one leg of 277, most other common systems would still have 120 across each coil, 480 delta is one common system that wouldn't be able to be derived with only six 120 volt coils though.
 
kwired said:
I agree that is a possibility, but also would think the base voltage across any one of the individual coils would be about 120 volts from there you can tweak the regulation a little to obtain the necessary 138.5 to put two in series to get one leg of 277, most other common systems would still have 120 across each coil, 480 delta is one common system that wouldn't be able to be derived with only six 120 volt coils though.
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Don't you adjust the voltage controls though, Ie 277/480 reconfigured to 138/240 and then the VR adjusted to put out 120/208 steady state?
 
mbrooke said:
Don't you adjust the voltage controls though, Ie 277/480 reconfigured to 138/240 and then the VR adjusted to put out 120/208 steady state?
Click to expand...

Yes, like I said the base voltage for each individual coil is 120 volts, which is what they operate at on most configurations, but you do tweak them up to 138 to get 277 out of them when you put them in series.
 
Is it possible they had a greenhorn stamping those nameplates and someone told the younger apprentice "two oh eight slash four sixty" and he took that to be "two oh eight slash four sixteen"? Just a thought.
Fire it up and see what you get out of it.
Or call Generac.

Edit: But how would 208 and 480 (460) be in harmony? ...

Maybe that phone call would be best.

Edit2: I just googled "416 volt generator" and there's plenty out there.
 
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mgookin said:
Is it possible they had a greenhorn stamping those nameplates and someone told the younger apprentice "two oh eight slash four sixty" and he took that to be "two oh eight slash four sixteen"? Just a thought.
Fire it up and see what you get out of it.
Or call Generac.

Edit: But how would 208 and 480 (460) be in harmony? ...

Maybe that phone call would be best.
Click to expand...

I don't think it was a production mistake - nameplate voltage, nameplate amps @ nameplate kVA do calculate correctly.
 
It is not a mistake.In our area,approx. 30 to 40 years ago there was a lot of 416 volts utility distribution systems.There are to-day ,still remnants of this in the downtown core area that is operational.
 
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