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'[EE:] adding to sinosoidal signals'
2004\06\30@091130 by Luis Moreira

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Hi guys
I have a three phase supply and a transformer connected between the Red
phase and the Blue phase ( R and T) the question is what will the resulting
sinusoidal look like in terms of phase compared with the original supply.
regards
       Luis

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2004\06\30@201137 by Hopkins

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do you mean you have a single phase transformer connected across a three
phase supply?

The normal way is to connect a single phase transformer between a single
phase and neutral.

Take a 400 volt 3 phase the connect a single phase load between one phase
and neutral you then have the square root of 400v = 230v

Were as phase to phase is 400v.

*************************************************
Roy Hopkins   :-)

Tauranga
New Zealand
*************************************************
> Hi guys
> I have a three phase supply and a transformer connected between the Red
> phase and the Blue phase ( R and T) the question is what will the
resulting
> sinusoidal look like in terms of phase compared with the original supply.
> regards
>         Luis
>



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'[EE:] adding to sinosoidal signals'
2004\07\01@004633 by Russell McMahon
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> I have a three phase supply and a transformer connected between the Red
> phase and the Blue phase ( R and T) the question is what will the
resulting
> sinusoidal look like in terms of phase compared with the original supply.

I'll assume this isn't for a test question.
Draw a graph and sum them manually and see, or use a spreadsheet.

I think you'll find that the input to the transformer will phase lead the
component with the leading phase by 30 degrees.



       RM

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2004\07\01@040127 by Luis Moreira

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Hi Roy

this is a phasing Transformer they are using the output of it to generate
the timing signal for the generation of the trigger pulses for the tyristor
bridge. As the system is quit old and I just found out there are no spares
for the PCB's I want to design a new system. I have to use in terms of
sensors and the power side of things, what is already there.
The transformer is definitely connected across the two phases (which are 240
degrees out of phase), what I need to know is in relation to the R phase or
the T phase how does the resulting signal will be.
best regards
               Luis

{Original Message removed}

2004\07\02@053618 by Peter L. Peres

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The phase on a load between the tips of two phases is at 30 degrees from
either and at 30 degrees from origin if one of them is considered the
origin. If the load is between the 2 phases which are not the origin then
it is at 90 degrees from the origin. This has a number of interesting
applications (such as driving a capacitor ac motor without a capacitor,
and in both directions, as well as some measurement applications, like
measuring reactive power with a usual wattmeter). This is easily seen by
drawing the three (or more) phases in a cartesian unit space as vectors.
Iow draw the vector diagram if you can't picture it.

Peter

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