Delta/Delta Transformer Question

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sparkyrick

sparkyrick

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Location
Appleton, Wi
Customer needs to go from 208V to 480V for a 15hp 3ph motor and said they were using this 30KVA transformer presiously. I looked at the nameplate and the only output voltage I see is 380V. I'm I not seeing something? I did feed it 208V like they had it and sure enough, only 380V.

Can this be used to go from 208 to 480? Or is this just some oddball transformer.

Some nameplate pics:

67c900e3fb7eb8ee4d8430759fc17c7d.jpg


9fd10eaac9d22a6c91b01900a0ea252d.jpg
 
Last edited:
sparkyrick said:
Customer needs to go from 208V to 480V for s 15hp motor and said they were using this 30KVA transformer presiously. I looked at the nameplate and the only output voltage I see is 380V. I'm I not seeing something? I did feed it 208V like they had it and sure enough, only 380V.
Click to expand...

What was the primary (low voltage in this case) rated? Must have been 208 if you got 380 on the high side.

380 volts is a common voltage for 50 hertz systems I believe. Your equipment may run on that voltage, but the closer it is loaded to full 15 hp the more trouble it will give you, as current will be high when near full load. If you were to only feed it with 50 Hz however your V/F ratio would be about right on for it's design, but it would only run at 83% of the speed it would run at 60 Hz.
 
After I posted you must have added the photo - it was not there before I posted.

I still think that transformer was intended primarily for converting from 240 or 480 volts to 380 volts for some equipment not made for North American markets.

Like I said it would probably power the 15 hp motor, and may do so without too much trouble if the motor isn't fully loaded.
 
My only concern is its now powering a new dust collector and it something happens, will the warranty be void because it was only getting 380v.
 
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