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Why transformer rating in kva not kw?

Substation Automation Electric Power Electrical Transformer
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Question added by faris kk , Electrical engineer , Newton trading & contracting WLL
Date Posted: 2013/11/27
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Aftab Ahmed
by Aftab Ahmed , Senior Engineer- Technical Service and Coordination Department , Pakistan Oilfields Ltd (POL)

Any Electrical Source shall mostly be rated in KVA. Transformer is also a Type of Electrical Power Source.

Further, any Electrical Load shall mostly be rated in HP or KW..

 

If Power Factor in the system remains near unity, Source KVA can be taken as KW also.

As Power Factors lowers in an Electrical System, Reduced KW of Source can be calculated as Source KVA  X  Power Factor.

 

Hence, an Electrical Technician / Engineer always keeps an eye on Power Factor of Its Electrical System.

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