Regulation of the mains voltage down in 3 phase system

[homoly]

Hello,

I am solving now a problem how to regulate down mains phase voltage in 3 phase system from 230VAC to 170 VAC. My first idea was to use transformer with one part with fixed ratio + in secondary connection of various secondaries in series. The problem is the huge variation of currents in secondary ( 170 VAC may be requiered at few tens of Amp and also few hundreds of Amp as well at the secondary ).

For this reason I have found some alternatives:

1.) Synchronous generator
2.) Induction regulator

Are some other alternatives to solve this issue except 2 mentioned above ?

Any advice will be appreciated.

Gabriel.

 

[waross]

Why??
If you tell us the application we can help with the solution. What is your load?
What are your regulation limits?


Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[homoly]

The input should be 3x400VAC 50 Hz delta output variable from 3x 170*sqrt(3) up to 3x 230VAC + Neutral.

This output voltage range should be avaiable for currents from 60A to 600 A / phase, now the particullary important area for me is 170V-180V area.

The aim of this system/device would be test system performances at the worst case low mains for various machines.

 

[waross]

Try auto transformers;

http://variac.com/

http://www.stacoenergy.com/pdf/updated/selector.pdf

And try this one. It is made for testing equipment at various voltages.

http://www.stacoenergy.com/pdf/brochures/MPController.pdf

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[homoly]

Bill,

Thank you. I will check the links.