Hi,

I'm a grad student. I'm searching thermal effects on an oil immersed transformer. I took many courses about communication but I want to move on EM now. Here is my question: When I searched on internet, I've learned that the beginning for thermal effects is Joule Heating. I've been searching for a long time but I couldn't find anything useful. Maybe the problem is me, I don't know. If you can help me about this subject or give me any advice or something like that, I really appreciate.

Thanks for your interests,

Best Regards

Emre

 

A number of handbooks for electrical engineers deal with power transformer losses.

Wiki has a starting point - but I guess you've already been there.

http://en.wikipedia.org/wiki/Transformer#Energy_losses

 

Dear t_n_k,

Actually I need some formulized equations. Do you know anything about these?

Best Regards,

Emre

 

I see.

There are obviously software tools that are used for transformer design and they are probably targeted at particular design areas - mains distribution, consumer electrical / electronics etc.

A casual scan on Google gave some typical commercial suppliers ....

http://www.softbitonline.com/transformerContents.html

http://www.rale.ch/

I'll have a look around and see if there are any other sources - perhaps a detailed text on practical transformer design might be readily available. I imagine transformer designers each have their own "rules of thumb" as well as particular design formulae.

 

Thank you a lot. I appreciate your help.

Best Regards

Emre

 

I found some interesting chapter on transformers in the "Standard Handbook for Electrical Engineers" by Fink et. al. Oil cooling is mentioned there.

As good a starting place as any I guess.

Some formulas are included but maybe not what you're seeking, exactly. As I suggested previously, they are perhaps more akin to "rules of thumb" - but well proven over many years of design experience.

 

Thanks for your interests t_n_k. I'm gonna look for the book you've told right now.

Best Regards

Emre

 

You want find much on oil filled transfomers,they have not been used since epa restricted there use. Danger,fire explosion,deformed babies.
Companies can't get insurance.

 

Hi loosewire,

Does that also apply to mains power units ...?

http://www.wilsonpowersolutions.co....d/liquid_filled_distribution_transformers.asp

 

Power plants would be at risk for employee cancer,accidents,hurricane
damage.I think the insurance is the bigger thing. Some governments
may allow them for cost and not having to answer to the people.
Try general electric and westinghouse they build large transformers.

 

I suggest you start by looking up the local standards in your part of the world.

Here is a link to British Standards for this cooling of power transformers

http://engineers.ihs.com/document/abstract/GKOJCAAAAAAAAAAA

 

I not sure about power companies using oil filled transformer out
doors.Regulation of power transformer.The regulaltion of a power
transformer is the rise in secondary terminal voltage,when fullload
is thrown off. It is expressed as a percent of full load voltage.
The regulation of a transformer in creases as the power factor
becomes more lagging due to inductive loads. Only a formula
to to release excess moisture,Still looking for a voltage formula.
Olny the induction formula for now,for what its worth.

 

Large oil cooled transformers are still the standard for outdoor use. It was the outlawing of PCB oils in the late 70s early 80s that caused a change in oil type used not the outlawing of oil cooling.

http://en.wikipedia.org/wiki/Transformer_oil

Lefty

 

Check his post,he looking electrical test with the oil filled transformers.
How do you get out from North Pole.

 

Thanks everyone for your comments. But I need a formulization. I should check the program outputs in a way which I think is the best because it seems like I'm making mistakes. I have to learn it.

Best Regards,

Emre