3 replies to this topic

[chaterpilar]

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?

[marke]

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,

[chaterpilar]

Thanks Marke for your input.

[spkam]

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



Regards