Auto Transformer

An auto transformer in this configuration will give you the desired voltage. However, you do not give us enough information to say if it is ok for you to connect anything.

Our requirement:-

I/P - 380V,O/P - 440V (stepup)

But in Auto transformer:-

I/P - 480V, O/P - 440/380/220V

Actually my question is,can we give 380V i/P supply to 380V terminal on sec.side and get the output from 440V on secondary since transformer is single winding.Please clarify it.

Repeating the same information in an abreviated form does not add new information to the discussion. I do not understand if you do not grasp how an auto transformer works or if you misunderstand electric power distribution in general.

...and the reason is that there is noting to rate the transformer to the load nor any indication of any circuit protecction arrangements. No-one can answer fully until these data are to hand.

It is time to consult a qualified electrical Designer locally.

Ye s that will work just fine. Power transformers generally don't really care which is used for the primary or secondary input or output points.

Actually, if you put in 380V to the LV side of that transformer, you will get 480V on the HV side of it, not 440V. If that makes a difference in your application, then it will not work.

You have been asked for more information and have refused to provide it, for example what this is for and why you need to boost voltage, so this is the only answer you can expect.

Dear All,

Our Equipment is operate in 440Vac,But we have 380V supply only.So we need to stepup the voltage to 440Vac.In this case Autotransformer Primary voltage is 480V but we have only 380V, In transformer name plate detail mentioned as Pri - 480V, Sec -440/380/220Vac.What i am asking that 380V supply connect to 380V terminal on sec. to get the 440V output on 440V terminal.i hope, you will understand my question now.

At great risk of sounding cynical (which I am) you should hire competent help to hook this transformer up for you. Assuming you have no one on staff who is competent.

It sounds like the transformer you have will be fine, if connected properly, by a qualified person.

It still cannot be fully answered, for the rating of thetransformer, th rating of the load and the circui protection arrangements are unknown, evven after the same scant information has been repated three times.

Stop work and pass the job over to someone who knows what to do.

Use the 380V tap(s) for input, the 440V tap(s) for output.

Replying to Comment by Tornado: Use the 380V tap(s) for input, the 440V tap(s) for output.

Oh duhr... It's an autotransformer.... <slaps forehead>

mohamedhajah,

You have no business asking this question! You are not competent to work on anything over 6 V.

Some selections from your dubious past posts:

1.Please anyone could tell me the design of MCC Panel board fabrication details.that means shop drawing for fitting the busbar,breaker position angle support.

2.ave doubt to use the 220V 2Pole,MCB for 380V supply,What will happen only reducing short circuit current or mcb insulation level.Anyone can give the answer.

3. Can anyone explain me difference between Megger and Hi-Pot test briefly

4. i have doubt about the connection of LV current transformer ratio 1600A/5A with neutral or ground.can anyone give the details.

5. 220V UPS input is mentioned as Line & neutral connection,But our system voltage is 3Ph,220Vac, so is it ok to connect L1 and L2 on UPS without neutral connection.

Spend some of the money you have to hire a person who, at least understands the fundamentals of electricity.

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Xfmr theory 101 (barely):

Transformer Winding Configurations

Once you get that straight in you head, you will probably see why your supplier gave you that model.

Didn't you give specifications to the supplier? They provided you with what you paid for, right?