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WisdomJD
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Join Date: May 2010
Location: RSA
Posts: 33

3 Phase Power Systems

10/12/2011 1:12 AM

How do I calculate the value of Zc, if Za and Zb are known in a 4 wire star connection unbalanced sytem 380V symmetrical? Neutral current,In, flowing away from neutral point is known.

I 1st calculated Ia and Ib with the aim of getting Ic via the equation:

In=Ia+Ib+Ic and thereafter using Ic to calculate Zc, but I am not getting a correct value of Zc.

Tx
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giri.gtr2010
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Join Date: Oct 2011
Posts: 3
#1

Re: 3 phase power systems

10/12/2011 6:29 AM

Hai goodday

which formula u are using

Thanks & Regards

GIRITHARAN.R

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bravo88
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Join Date: Dec 2010
Location: 1° North Singapore
Posts: 568
Good Answers: 17
#2

Re: 3 Phase Power Systems

10/12/2011 7:21 AM

Just a quick note which you may have missed,

In=Ia+Ib+Ic , In is summation of all phase current in vector form.

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TonyS
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Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
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#3

Re: 3 Phase Power Systems

10/12/2011 9:54 AM

Transpose

In = √((Ia²+ Ib²+ Ic²)-((Ia*Ib)+(Ia*Ic)+(Ib*Ic)))

I'm not doing it for you, it's your homework!

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