Transformer Protection
Transformer Protection
(OP)
I have a Secondary Unit Substation, the transformer is rated 2500 KVA, 13.2KV Primary - 480V Secondary, 3 phase. I was providing overcurrent protection and differential protection to the transformer but other engineer eliminated the differential protection because he said is too expensive and not needed for this type of transformer.
My question is, transformer differential protection is not neccessary or recommended in this case? If not when is needed?. Thanks
My question is, transformer differential protection is not neccessary or recommended in this case? If not when is needed?. Thanks






RE: Transformer Protection
Typically transformer diff protection is found in transformers size 10 MVA or greater. The transformers are among the most reliable electrical equipments, so it helps taking more risk, especially for smaller size units.
Factors in decision making may include:
Probability of an internal failure.
Possibility of localized repairs to the winding.
Cost of repairs vs. replacement.
Criticality of the application.
Rafiq Bulsara
http://www.srengineersct.com
RE: Transformer Protection
RE: Transformer Protection
Again it comes down to cost, or equipment protected, or cost of down time.