Pole Transformer Ratings
Pole Transformer Ratings
(OP)
Someone made a statement to me that the typical can type pole transformers can be safely overloaded by 50%. Anyone have any opinion on that statement.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Pole Transformer Ratings
One reference is IEEE C57.91-1995 Guide for Loading Mineral-Oil-Immersed Transformers
RE: Pole Transformer Ratings
Utilities may also find that allowing the load to reach a point where there is some loss of life can be more economical than replacement. The utility I used to work for had a loading policy of loading to 125% initially and replacement at 225%. This was based on a life cycle cost analysis that took loss of life into account, based on the standard referenced by busbar.
RE: Pole Transformer Ratings
The real deciding factor is where do you live, and what season is it? During the winter months transformers may be overloaded in the 200% range for several hours without any damage if you live in a "winter-wonder-land" such as I do.
I.e. ambient temperature is the key.
Regards,
TULUM
RE: Pole Transformer Ratings