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Participant

Join Date: Jul 2014
Posts: 1

Frequency - Temperature Characteristics of Transformer Winding

07/25/2014 2:26 PM

Dear Sir,The rating of a single phase transformer is 230V / 230V (1:1), 5A, 50 hz, 1200W.When this transformer is operated at 230V, 5A, and 50 hz the transformer winding saturated temperature may be some value. Now when the same transformer is operated at 230V, 5A and 40 hz (reduced frequency), what will happen to winding temperature? will temperature decrease or increase? what can be the reasons for temperature change?is there any relation between frequency and winding temperature of transformer?
Thank you

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Guru

Join Date: Oct 2008
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#1

Re: Frequency - Temperature characteristics of transformer winding

07/25/2014 3:17 PM

What do you think will happen, and why?

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Guru
Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
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#2

Re: Frequency - Temperature characteristics of transformer winding

07/25/2014 4:18 PM

That's a good exam or interview question. How did you answer it? The answer is probably not what you think, but the correct answer will not be revealed until after you have shown us your answer and the logic that you used to arrive at it. Hint, no calculations are necessary.

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Guru

Join Date: Mar 2007
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#3

Re: Frequency - Temperature characteristics of transformer winding

07/25/2014 8:17 PM
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Guru

Join Date: Oct 2006
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#4
In reply to #3

Re: Frequency - Temperature characteristics of transformer winding

07/26/2014 2:28 AM

GA

But how did you find that?

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Guru

Join Date: Mar 2007
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#6
In reply to #4

Re: Frequency - Temperature characteristics of transformer winding

07/26/2014 8:44 AM

It's obviously a test question....Searching a test question will usually yield results....

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Commentator

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#5

Re: Frequency - Temperature characteristics of transformer winding

07/26/2014 2:53 AM

Go back to basics.

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Guru
Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
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#7

Re: Frequency - Temperature Characteristics of Transformer Winding

07/27/2014 5:09 AM

Dear Mr.makkena,

If frequency is reduced to 40 hz (from 50 hz) the Inductive Impedence will reduce by 20% - since it is directly proportional to the Frequency, the Heating Effect of winding will come down, Power Factor will improve.

Simultaneously Impedence due Capacitance will increase, since it is INVERSELY proportional to the Frequency, and over all effect will increase the P.F.

DHAYANANDHAN.S

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