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Power Transformer Rating Selection
- Thread starter salem
- Start date
electricpete
Electrical
Other factors that might be considered include:
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)
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)
- Thread starter
- #4
There is no simple answer because it depends on the nature of the loads, the application, economics and other factors. For industrial applications, I would size the transformer such that its maximum forced-cooled rating is slightly larger than the highest peak demand expected. Plus whatever allowance is appropriate for future growth.
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.
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.
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