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Transformer Riddle No.80 - Furnace transformers
Rating of a furnace transformer in delta primary is ok but if primary in star transformer kva rating is less than of the rated capacity why?
Author : Unknown
Sun, November 20th, 2011 - 13:42
Rated KVA (S) of transformers is:

S = √3 V.I

Which V and I are winding transformer voltage and current rated capacity respectively. When you change the primary connection from delta to star, you loss a part of transformer capacity, because you cannot increase transformer current from its rating (I) while you apply 1/√3 V (rated voltage) to primary winding.
Author : Hamid - From: Iran - Firoozabad Fars
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