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satnat.2008
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Join Date: Oct 2011
Posts: 34

Rotational Angle

10/16/2014 5:09 AM

Transformer directional over current protection .

For determining directional fault the rotation angle of voltage is taken has referance . however to set the voltage rotationla angle .... typically 30-60 degree has been used . hence pl explain how to choose the set value between 30 to 60 incase of a transformer with primary connected with cable and secondary connected with busduct ....
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IdeaSmith
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#1

Re: Rotational Angle

10/17/2014 1:26 AM

Try this and come again!

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satnat.2008
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#2

Re: Rotational Angle

10/17/2014 1:49 AM

i have already tried those and didn't get a proper answer . Hence posted for expert's answers .
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IdeaSmith
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#3
In reply to #2

Re: Rotational Angle

10/17/2014 4:05 AM

Whats the question then?

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Anonymous Poster #1
#4

Re: Rotational Angle

10/18/2014 2:27 AM

The angles of voltages and currents of a transformer depend on its winding connection. For example, if it is Y/D-11 or D/Y-11, the angles of voltages and currents will deviate +/-30 degree. The deviation would be 30, 60, 90 ...120 degree depending on the index connected. You should watch an example show how winding connections of transformers affect the result of fault calculation http://www.psa-outline.com/asymmetrical-short-circuit-calculation-simulation/
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satnat.2008
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#5
In reply to #4

Re: Rotational Angle

10/20/2014 2:06 AM

thanks for your guide...

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