transformer

Depends on whether it is powered up or not!!

If it is not powered up....Then you will get a mess...

If it is powered up....Then you will get a big mess...which fortunately or not you will not be around to clean up...

Sapper

Hello aparna_prayag

It is not recommended to put your email address in any Forum, here at CR4 or elsewhere.

Search Engines and Spam harvesters regularly visit, and "add your email address to their list", sometimes on-selling the information to others.

The Transformer Core Cut

There are many ways to "cut a transformer core centrally" - Advise further please

Advise transformer Voltage- specify please

Is the power to be "on" during the cutting operation? - Yes/No/maybe - specify please

Advise transformer core type and approximate dimensions:

1. E + I laminations
   
2. Rectangular
3. circular
4. ovoid
   
5. Toroid
6. other - specify please
   

We also need to know the material the core is made from:

1. air
2. soft iron
3. Ferrite
   
4. other - specify please
   

We would also need to know the frequency of operation:

1. Mains 50 or 60 Hz
2. Single or three phase if power transformer
3. Audio frequency
   
4. Radio frequency
5. TV "Flyback" transformer
   
6. High Frequency to 30 MHz
7. 30 - 100 MHz
8. 100 - 300 mHz
9. 300MHz to 1GHz
   
10. and so on - specify please

That may help to narrow the extremely wide field, which your present question addresses ....

With the switch x on you will x have two x working transformers. Where x must be replaced with almost.

Hi aparna - Do you intend to use 1/2 the core on the transformer?

Do you want the windings on separate cores?

Wat is the intention of the cut?

If still energised:

Guys, the man put just a simple question and you ended up in making a big deal by this.

In my opinion, if you cut in two a transformer core, it wouldn't happen more than to have a plus cut (or gap)in the path of the push-pull magnetic field: it's like a chain reaction which can't be stopped by air or any other nonmagnetic material acting like a physical wall. Maybe the efficiency would be affected somehow. So no one catastrophic jeopardy. Saluti amici!!!

Hello Dumitru,

Thank you for your reply above.

Unfortunately you have misinformed the question asker, as in certain situations, the result of cutting a transformer core in half can be catastrophic.

When I read the original question, I realised there are a number of variables, which if answered properly would take hours of writing, or dozens of weblink references, and the question asker would be either bored or confused, by the complexity of the answer.

So........to clarify the situation, and narrow down the large scope of an answer, I have found it best to establish some definite facts, then the correct and hopefully brief reply can be made.

I was not "making a big deal", about it, just doing the logical thing, in the nature of an Engineer.

I await the original Question Asker's arrival back here to read the answers, and giving some feedback, so he/she may be assisted in a proper manner.

Many question askers do not bother, just giving poorly thought out questions, in the manner of young schoolchildren, to waste time here on CR4, often asking "impossible to answer" questions.....

I trust you accept this reply to your Post as not "making a big deal" out of your Post, but genuinely explaining why I wrote what I did.

You will note that often Forums discussions may get rather boring, and on occasions it is a good idea to have a laugh, or put in a picture or two.

Everyone is different, learning ability and depth of understanding, (please note I said understanding not knowledge), at different levels, which is fortunate, as I would hate to be in a world populated only by everyone just like me..... and I put my picture at the end of this Post, just so you know who I am

Kind Regards from faraway..........

If the Transformer is in Service, the connected Windings will also be cut and there will be sudden abnormal rise in Volatges of Windings may cause failure of Insulation leading to failure of the Transformer, if it withstands the Transformer will stop functioning further. If the Transformer is cut when it is not in service, there is a chance that the LV Windings may touch the HV Windings causing damage to the Equipment.

Hello Guest,

You have misinformed the Question Asker.

You have also assumed something not stated: The type of Transformer.

Please refer to:

http://cr4.globalspec.com/comment/157167/Re-transformer

Kind Regards.....

Apart from all that have been said pl. note the core material is sensitive.even in shop floors while assembling it is handled in a particular manner ie it is never held vertically as the magnetic properties can be affected.even if one assumes u can take all precautions and cut it neatly in two usable halves properties of the material will change and will not be the same.I am curious as to know why do u want to do it?though I enjoyed reading all the various answers

I'm not sure but I'll bet the post is in regards to a center tapped xfmr.

If you have a center tapped secondary and measure from one lead to the center tap you get 1/2 the voltage (peak and rms) you'd measure from across the entire secondary. Many utilities use the center tap as a neutral wire.

Hello Miss Aparna

I have read all the replies ; please answer the questions by SPAKSTATION ; for the benefit of all of us .

I suggest you get hold of a small transformer say 220V AC Input and 12/6 ( 500 mA)or whatever output . and get ready to destroy it for the benefit of experimentation !

surely you are not so dumb as to cut the core in any which way you can with the coils still in place !

connect the Primary ie 220V side to the mains and measure the Secondary ie 12/6 V

sides voltage and if you can manage a 12 Ohms / 6 Ohms 5 /10 watt resistor ; connect it to the secondary and measure the current ; note it down.

now in the transformer( let me presume its not Toroid/ Ferrite etc)there are laminations shaped like E ; the coil bobbin 's hole is filled up by E's facing each other with center arm of E going thru the bobbin hole .there are I 's too to to fill up the void between the face to face E's.

please take the trouble of dismantling the transformer , put all E s to gather and Insert in the bobbin leaving the I s aside. connect the volt meter to the secondary and connect the primary to 220v for a few seconds so that you can read the voltage & note it down ; switch off the 220v and feel the temperature of the coil/ core.it is likely to be unusually warm/ hot; connect the resistor ;measure the current .

now you more or less know what happens when the core is half ed.

thanks for the patience

PKD.

If transformer core is been cut centrally, magentic motive force will not been balanced properly.