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siegfredo c. tabanag
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Join Date: Feb 2012
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% Impedance In 3-Phase Transformer

10/20/2012 10:48 AM

What will be the percent impedance to be used in computing the Short Circuit current of a 300 KVA three phase transformer connected Wye-Delta from three single phase transformers banked together. 13.2KV/240V: 2.8 % for each transformer: 100 KVA each
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nobodysomebody47
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#1

Re: % IMPEDANCE IN 3-PHASE TRANSFOMER

10/20/2012 11:43 AM
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Joshi
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#2

Re: % Impedance In 3-Phase Transformer

10/21/2012 6:07 AM

"connected Wye-Delta from three single phase transformers banked together."

Is that true? Is it because you have these transformers lying around or bought from discount/bargain deals? Why were the transformers sized this way, in the first place? Is this considered better/best? Looking forward to learning something new/esoteric theory.
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siegfredo c. tabanag
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#3
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Re: % Impedance In 3-Phase Transformer

10/21/2012 10:09 AM

in the Philippines,it is our practice to banked 3 identical single-phase transformers to supply three phase power to a building. this is to standardized sizes and flexibility in case one of the transformers will be damaged, we can still operate temporarily in open delta connection using two transformers only.I don`t know in your own country which is more developed than mine. Thanks. .
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Joshi
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#4
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Re: % Impedance In 3-Phase Transformer

10/21/2012 10:14 AM

Thank you siegfredo c. tabanag. You have a good point there.
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siegfredo c. tabanag
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#5
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Re: % Impedance In 3-Phase Transformer

10/21/2012 8:10 PM

Thanks also!
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Joshi
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Re: % Impedance In 3-Phase Transformer

10/21/2012 10:19 PM
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Joshi
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#7

Re: % Impedance In 3-Phase Transformer

10/23/2012 2:49 AM

Does not the name plate on the transformer, show this figure?
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Previous in Forum: Switchgear Question   Next in Forum: Can Anti-Parallel or Back to Back Connection of SCR Save kWh?


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