A Few Question About Transformer

Sorry....but i have answer some questions...

But main concern is on question 4...

No......

read text book Don't try to get ready made answers.

4 Core or shell type construction doesn't have anything to do with whether the high voltage winding is on the inside or the outside.
Where the high voltage winding is actually high voltage (say over 1000 to 10,000 volt) it is normally wound on the outside.

Watch the Transformer 3 movie....and you will know the answer....

To Banana86: Haha this is a good idea i've watched the movie last week. It is a great idea and i can present the"type" of transformer to my lecturer. HAH

To TonyS and Anonymous Poster #1: First of all i would like to say sorry to you all...I know so many people would like to get the short cut in this forum...I would get the answer on next monday but of coz i will still answer thoser answer and close the post...Thank you^^

To Carl Pugh :Thank you for your notification!!^^ i may change some key words in this question. Since we have to discuss the ready power transmission and distribution transformer in Hong Kong which are step down Tx. (Which mean the transformer in the transmission and distribution network in Hong Kong, 400kV-11kV and 11kV-380V)~~>if i have some mistake please rise it...since i have learnt power system just a few weeks....So the words LV windings will be the secondary winding while the HV windings will be primary winding.

My lecturer just ask in this way but i have to trust him and try to give him an answer...haha=.= My friend explain why the captioned tranditional winding structure (HV outside and LV inside) Of coz my lecturer has some other questions like why the tx core has stepped core structure. I will try my best to find all the answer in these 2 days. Thank you so much.^^

I like when people do come back despite our a bit harsh words.

You see in our old generation we had text books only and no computers.

To find an answer hence - no search features- go through the book (plural in quite a few cases) and then the answer might be composed (it won't be available in so many words)

The advantage was that just by going throught it- you visualise, read something irrelevant (to the current assignment) and things go into memory, at least traces of it and you know where to look for answer to a given question.

This is why we remember the points even after 30+ years of leaving the colleges and that too despite many of us are not in the field of application too.

Remember - faster you get a solution, quicker you forget.

As far your question 4 is concerned - what is the erason of placement of windings outside or inside?

Think about stresses - mechanical (That too happen due to current carrying conductor in a magnetic field) and electrical (of course insulation).

Advice - since you seem to be one who tries or should - Mull over the problem - why a particular feature was there - then why was it changed - must have been due to

efficiency - ie better flux linkages

or failures -

Which one will be here? One of them (and it didn't compromise the other) or both ?

Thank you so much!!! I will try my best to get the answer!^^

s far your question 4 is concerned - what is the erason of placement of windings outside or inside?

Think about stresses - mechanical (That too happen due to current carrying conductor in a magnetic field) and electrical (of course insulation).

Advice - since you seem to be one who tries or should - Mull over the problem - why a particular feature was there - then why was it changed - must have been due to

efficiency - ie better flux linkages

or failures -

Which one will be here? One of them (and it didn't compromise the other) or both ?

Thank you so much!! Your comment give me some interesting direction on this topic. I spend some time on learning the mechanical stress on tx windings. I hope that i can find more supporting reason on my question. But my friend still standing strong on the reason of insulation. (HV need higher insulation with the core, hence HV winding have to be the outermost winding) ... I have to study it more.....THanks again!!

HV = say 11KV

LV = 415V

Core = 0 V

HV-LV = 10585V

HV-Core = 11000 V

(Do they differ much? ask your friend. I am not going to extremes where HV may be 400KV and LV may be 11KV.)

Also find out something about interleaving of windings.

My lecturer ans on question4:

I recently visited the Tx factory and found this winding construction. So i am just interested to ask this question..

He said this winding construction mostly found in some some voltage tx. The high volt winding is thin. It may easily broken when the HV winding is wounded around on the outermost diameter.

But for those winding construction seen in the supposed tx factory. He has no more comment on this question. =.=

You sound like a nice guy. But, homeworks supposed to be worked out by the students themselves. That is the homework FOR, guys!!

Thank you all spend so much time to share the experience. My lecturer always ask me to read read and read also. I hope I can solve those problems tomorrow. Thanks again!