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# Outout of a transformer!

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Hi

A university expert has said that:

Imagine a transformer connected to a Ac Voltage (between Phase and Nuetral i.e. 100V).
it has an output of i.e. 12V ac.

If you connect this trasnformer to the same AC Voltage (100V) which this ac voltage is comming from Two Phase which have 100V then the output will not be 12 V and is lower than That.

{I mean, Imagine you have connected two Phase to a transducer and this transducer gives 100V rsm at its output then you connect this output to that trasnformer, Then The output will be lower}

I myself have not tested this, it is just what that expert has said and asked to look for the reason?

Is it possible?

ThanX
Shahriar

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Hi Shahriar,

Maybe it’s just me but I don’t understand what you mean??
Please try to clarify and perhaps a sketch wouldn’t hurt.

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Dear Ante

I think it is more clear now. If you didn't understand tell me to explain more.

ThanX
Shahriar

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It doesn’t matter where you get the voltage from; if you put 100VAC on the primary the secondary will have 12VAC.

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Dear Ante
I also have the same Oponion. It seems impossible.

ThanX
Shahriar

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I think it is simple:
The transformer ratio will decide the output voltage, not the source of the input voltage!

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The line-to-line voltage of a three-phase system is √3 times the line to neutral voltage. This quote is taken directly from the following website.
http://en.wikipedia.org/wiki/Three-phase_electric_power
Another interesting website is
http://www.federalpacific.com/university/transbasics/chapter3.html
So, contrary to what the expert tells you, the voltage is actually higher by approximately a factor of 1.732. Therefore I would expect the phase to phase voltage to be around 173 volts.

After all is said and done, though, Ante is right. It's the transformer ratio that determines the output voltage.

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