I am planning to replace a 5KV step down transformer to accommodate an additional load of approximately 800Amps @ 208V. I am confused by the term Volt Amperes and also input and output specifications. I have IEEE 57.12.26.1992 but it assumes an understanding of the terms. I would appreciate any information or direction.
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Sizing Step Down Transformers
- Thread starter dcrough
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JohnHamburger
Electrical
From the basic three phase power calculation, KVA = VOLTS X AMPERES X SQRT(3)/2. Your 800 ampere, 208 volt additional load is 288 KVA. The input and output voltages are to be found on the nameplate of the existing transformer. I suggest that you engage a profewssional engineer to assist you in determining the available parameters of your electrical distribution system to determine if you can add the load to the existing distribution system.
JohnHamburger
Electrical
I apologize for the incorrect formula. The correct formula is VA = VOLTS X AMPERES X SQRT(3)/1000.
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