7 MVA, 600 V Motor Loads

[Blackberry77]

We have a Client that is requesting a 7 MVA motor upgrade at their facility by adding a 44kV-600V power transformer and some switchgear. Now, this as a requirement requires switchgear with ~7000 A requirement at 600 V. This would not be an easily obtained item. Would our best bet to split the number of transformers into more with multiple switchgear lineups or are there more economical options?

 

[FreddyNurk]

I would have thought that at 7MVA, 600V would not be a preferred supply voltage option, unless its to feed multiple motors.

EDMS Australia

 

[veritas]

If you go down the multiple transformers route, you'd probably want to run them split and not parallel else your fault currents would be substantial, not to mention arc flash headaches! I'd probably look at 4 x 2MVA units. Will mean significantly more hardware and real estate. However, don't know if there is a smarter solution. Are these VSD drives? You may consider using different trfr vector groups to lower the harmonics.

It seems like you have many smaller drives (up to say 400kW) as economics would dictate that you use HV motors around 500kW and above.