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Inverter Duty Transformer


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#1 chaterpilar

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Posted 08 March 2008 - 11:15 AM


Hi !!,

We have a project to make a VFD based panel for a 2080 volts 60hz 250 hp submersible pump ( 300 metres deep).

The vendor is proposing a 380 volts VFD of rated capacity and a inverter duty Autotransformer to stepup the output of drive to 2080 volts.

I find it a bit odd, to put a stepup Auto-transformer in between the drive and the motor.

I recommended a 2080 volts rated VSd and to put the transformer on the line side.

The available supply is 380 volts 60 hz.

Is it Ok to put a Auto-transformer at the output of drive?

Any thoughts?



#2 marke

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Posted 08 March 2008 - 06:49 PM

Hello Chaterpilar

Yes, a motor is just a rotating transformer and this is done frequently.
The only issue is if the drive was a sensorless vector, it may get confused. You are best to operate in V/F mode.
I would work on the suppliers recommendations to ensure that there are no incompatibility issues.

Best regards,

#3 chaterpilar

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Posted 09 March 2008 - 03:18 AM

Thanks Marke for your input. wink.gif

#4 spkam

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Posted 21 March 2008 - 06:42 AM

If at all you decide to install a transformer , Take care of its K rating for sufficient harmonics withstand capablity.



Regards




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