Hi voltage submersible pump 2200

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electricmon

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We have a soft start 480v 400a that feeds a 480 v / 2350v 2260 KVA step up VFD Transformer then hits a GW vacuum switch and then goes to the 200 hp 2200v submersible motor which is about 1000' down in a hole .
My Question is there any conflict with the soft start feeding this muti tap VFD Transformer Powell-FSCO Brand.
Or does that not matter to feed a VFD Transformer though a scr drive?
Thanks,
George
 
No problem with the technology, it just might be a bit of overkill IMHO. If by "VFD transformer" you mean one designed to be on the output side of a VFD, then the transformer is designed with low permeable steel laminations because of the possibility of operating in varying frequencies, something that costs money compared to a standard transformer. A Soft Starter does not vary the frequency, so that extra feature is essentially unnecessary. You could have done it with an off-the-shelf transformer (not that there is such a thing any longer). But that will not stop yur from working just fine, it's done quote a lot.

The trouble with that design philosophy is that the losses through the transformer represent a continuous energy waste compared to just using a Medium Voltage soft starter. But if you do not have 2300V available, then this may be your only choice.
 
Thank you for that information. Yes I kinda realized that. I was looking at this whole design issue, and was not familiar with the variable frequency drive transformer., but it's apparently just as you mentioned. Thank you for your input.
George
 
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