Transformer Bushing
Transformer Bushing
(OP)
I need help to identify the difference between distribution class and power class bushing for power transformer
Thanks
Thanks
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RE: Transformer Bushing
There is no difference between a bushing used on a distribution transformer and a power transformer.
The transformer manufacture usually goes through the bushing manufacture's catalog and selects a bushing that meets the mechanical requirements, operating voltage, operating current and test voltages of the transformer being designed.
Since power transformers operate at higher power and are usually tested at higher voltages, bushings used on power transformers tend to be larger than bushings used on distribution transformer.
RE: Transformer Bushing
RE: Transformer Bushing
o Maximum continuous operating current.
o Basic insulation level (BIL)
o Creepage distance of the bushing
In polluted environment, the minimum creepage distance may be the driving parameter to avoid flashover. Therefore, larger bushing with higher BIL may be required by the minimum values stipulate in the standards.
Below, is the minimum dielectric insulation level per ANSI/IEEE Std C57 for distribution transformer and Class I power transformers.