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Electromagnetic couplings of Transmission Lines

Posted 17 apr 2014, 03:20 GMT-4 Low-Frequency Electromagnetics Version 4.3b 7 Replies

Dejan
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Hi everybody,

I want to study electromagnetic couplings of Transmission Lines on a tower in
quasi-static domain (50 Hz).
I use the 2D dimension and as physics I use Magnetic and Electric Fields (mef).
The solver is in the frequency domain.
My sources should be:

L1=I*sin(wt)
L2= I*sin(wt+240°)
L2= I*sin(wt+120°)

But my sources are currently
L1=I
L2= I
L3= I

My problem is I do not know if I can model something like this in frequency domain.
And I cannot find a boundary for the grounding.

I have a picture and my model attached and hope someone can help me.

Best regards
Dejan
7 Replies Last Post 24 apr 2014, 09:48 GMT-4
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago 17 apr 2014, 05:45 GMT-4
Dejan,

you can apply phase shift using complex notation. Ground or electric potential BC is available under the Magnetic Insulation node.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Dejan, you can apply phase shift using complex notation. Ground or electric potential BC is available under the Magnetic Insulation node. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Dejan
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Posted: 1 decade ago 17 apr 2014, 06:30 GMT-4
Hello Edgar

Thank you for your quick response.
Is it possible in Comsol (frequency domain) at least in the post process to produce a sinusoidal signal?
Maybe with the 1D plot (Global).

Best regards
Dejan
Hello Edgar Thank you for your quick response. Is it possible in Comsol (frequency domain) at least in the post process to produce a sinusoidal signal? Maybe with the 1D plot (Global). Best regards Dejan
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago 17 apr 2014, 06:48 GMT-4

Yes, you can use the phase as x-axis parameter.

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Yes, you can use the phase as x-axis parameter. -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Dejan
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Posted: 1 decade ago 17 apr 2014, 07:07 GMT-4
Hi Edger,

thanks again for your help, but something I'm doing wrong.
Could you, if you have time, look at my model, I cannot produce sinusoidal curve?
And I do not know why?

Best regards
Hi Edger, thanks again for your help, but something I'm doing wrong. Could you, if you have time, look at my model, I cannot produce sinusoidal curve? And I do not know why? Best regards

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Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago 17 apr 2014, 07:36 GMT-4
The parameter J3 is a constant per your definition. You have to use a field parameter, e.g. a point plot of a magnetic flux density component or a current density component. Keep in mind that only vector components are phase dependent, the normalized quantities are not (in COMSOL). You can add points into your geometry or use probe plots.

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
The parameter J3 is a constant per your definition. You have to use a field parameter, e.g. a point plot of a magnetic flux density component or a current density component. Keep in mind that only vector components are phase dependent, the normalized quantities are not (in COMSOL). You can add points into your geometry or use probe plots. -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Dejan
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Posted: 1 decade ago 23 apr 2014, 02:53 GMT-4
Hello Edgar,

once again thank you for taking the time and helping me.
I have learned a lot.

Best regards
Dejan
Hello Edgar, once again thank you for taking the time and helping me. I have learned a lot. Best regards Dejan
Dejan
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Posted: 1 decade ago 24 apr 2014, 09:48 GMT-4
Hi everybody,

I have one another problem with the post-processing.
A line is supplied with the boundary “External Current Density at a current of 1000 A.

But if I measure the current with intop1 (mef.Jz), I get a current of only 1.6 A peak.

However, when I measure the current with intop1 (mef.Jez)
I get a current of 1000 A peak.

What is the difference between Jz and Jez.
The current is measured with intop1 (mef.Jz ) must be 1000 A peak, or ?.

Best regards
Dejan
Hi everybody, I have one another problem with the post-processing. A line is supplied with the boundary “External Current Density at a current of 1000 A. But if I measure the current with intop1 (mef.Jz), I get a current of only 1.6 A peak. However, when I measure the current with intop1 (mef.Jez) I get a current of 1000 A peak. What is the difference between Jz and Jez. The current is measured with intop1 (mef.Jz ) must be 1000 A peak, or ?. Best regards Dejan

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