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mir imran altaf
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Join Date: Apr 2011
Location: india
Posts: 21

Transformers

07/13/2012 7:14 AM

if we provide single phase voltage of 300 volts to RY terminals at hv side of a 33000/440v three phase transformer and keeping all other terminals open, then what would be the voltages at other terminals .ie RB, BY at both hv and lv side...
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
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#1

Re: transformers

07/13/2012 7:16 AM

Duplicate thread, sort of.

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PeterT
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#2

Re: Transformers

07/13/2012 12:02 PM

Sounds to me like a homework question, to see if the student understands the relationships of the phases and the primary & secondary windings of a transformer.

mir imran altaf, it is important to know for a 3-phase transformer if the primary and secondary windings are connected in Delta or Wye (star). Then draw it out to get the phase angle relationships between the windings. A little math will get you the rest.

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electricalexpert65
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#3

Re: Transformers

07/13/2012 11:09 PM

This, in fact, is called the Magnetic Balance Test in Transformers.
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PeterT
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Location: Liverpool, NY
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#5
In reply to #3

Re: Transformers

07/16/2012 10:12 AM

Well, I guess you can learn something new every day. Thanks EE65, I will have to look it up.

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sukumar75
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#4

Re: Transformers

07/14/2012 1:16 AM

Across RB & BY (primary) = around 150V and

rb & by (sec) = around 2V
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