VFD Feedding a Power transformer 2

[petronila]

Dear All ,

We are developping a motor control test center project, and some of our collegues are suggesting to use a VFD to fed a power transformer in order to change the transformer´s voltage output with out change the frecuency, this is intendded for load and no load test.

Any one with similar experience ? pros and conts??

Thanks for the Inputs

Petronila

 

[slavag]

Hey Petronila.
As I remember, Gunnar recommend you several things in the Electric motors forum.
Why you ask again???
Regards.
Slava

 

[petronila]

Yes Slavag,

But the electric Motor forum is for motors and I would like to know more about the possible problems with the transformer.

Thanks
Petronila

 

[jghrist]

suggesting to use a VFD to fed a power transformer in order to change the transformer´s voltage output with out change the frecuency

Wouldn't the VFD change the frequency not the voltage?

 

[Zogzog]

VFD does both, with limitations.

 

[edison123]

petronila

I am on a similar project for my shop. Take a look at

thread237-189759


* I would go green if only I were not yellow *

 

[petronila]

Thanks Edison,

Culd you sayd me you`r shop name?

Regards

Petronila

 

[edison123]

petronila

Please visit

http://www.edison.co.in.

* I would go green if only I were not yellow *

 

[rcw retired EE]

I would not trust test results from a VFD supply unless signifiicant filtering was used to almost eliminate harmonics. One of the purposes of the load and no load tests on a transformer is to measure the losses and impedances accurately. Harmonics from the VFD's may increase losses in the transformer and can make it difficult to get an accurate KW reading.