Power Transformer Rating Selection
Power Transformer Rating Selection
(OP)
How to choose the rating of a power transformer 11/0.400 kV.
Is it to be chosen based on the total connected load to the transformer or their are other factors to be considered.
This transformer is used to supply loads inside a hospital.
Is it to be chosen based on the total connected load to the transformer or their are other factors to be considered.
This transformer is used to supply loads inside a hospital.





RE: Power Transformer Rating Selection
Impedance => impact on voltage under varying load conditions including motor starting.
Impedance => impact on short circuit current availability
future load growth? emergency overload in event of contingency (failure of alternate transformer)
RE: Power Transformer Rating Selection
wbd
RE: Power Transformer Rating Selection
Is the minimum transformer rating to be chosen equal to the total connected load (no diversity or maximum demand considered).
RE: Power Transformer Rating Selection
For a hospital I would be more conservative and probably size based on connected load unless this was clearly unreasonable. As a minimum, I would size such that the transformer could carry the maximum expected peak load continuously at its self-cooled rating - no reliance on fans.