Supply of MV/LV transformer and PFC from the same feeder

[mastergate]

Hello everyone

I need advise regarding the proposal attached, to derive the power supply to a new 11kV/415V transformer from a PFC feeder.
Are there any restrictions in the international standards (preferably IEC)? constraints in term of protection, availability...

Thank you for helping.

 

[RRaghunath]

PFC could cause overvoltage at transformer terminals and saturation of transformer core. This means there is a possibility of resonance between capacitive reactance of PFC and the inductive reactance of the transformer. Hence, it doesn't seem to be a good idea.
If there is no incomer breaker on 415V side of transformer and closure of 11kV breaker energises the transformer alongwith load on secondary, the proposed arrangement probably could work.

 

[mastergate]

Thank you for your answer.
Do you know any standard where I can find some indications? Regarding this and also regarding protection issues..

 

[RRaghunath]

May be, if you google "Ferro-resonance", you may find what you are looking for.