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Cable harmonic heating

Posted Sep 18, 2023, 6:36 a.m. EDT Electromagnetics, Low-Frequency Electromagnetics, Heat Transfer, Results & Visualization, Studies & Solvers, Physics Interfaces Version 6.1 2 Replies

Zafer El Khatib
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Hello,

I am new to COMSOL and have a question regarding a project I am working on. I am basically trying to model a 3-phase buried cable system with the purpose of studying the heating caused by having harmonic currents flowing in the cables and the impact that the skin and proximity effects have on this heating. I have successfully modeled the cable system and can individually see the impact of the harmonics at each frequency separately by running a parametric sweep in a Freqeuncy-Stationary study however I am interested in running the simulation with all the currents present at the same time in the coil entity. The idea I had was to somehow to run the study at 50Hz and then have the final temperature of this iteration be the initial temperature for the cables in the next step (100Hz) and so on up to the final desired frequency (2500Hz) but I have no idea how to do this. I would really appreciate the help. Please find attached a copy of my COMSOL file.

2 Replies Last Post Sep 20, 2023, 6:47 p.m. EDT
Edgar J. Kaiser Certified Consultant
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Posted: 7 months ago Sep 20, 2023, 3:45 p.m. EDT

Hi Zafer,

you may want to look into this blog contribution by Walter Frei.

https://www.comsol.de/blogs/using-the-previous-solution-operator-in-transient-modeling/

The example shown is in time domain, but should work in frequency domain as well. With a little additional algebraic equation you can sum up all power contributions from the harmonics and use this power for the thermal physics. Key is the use of the previous solution in the equation.

Good luck, Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi Zafer, you may want to look into this blog contribution by Walter Frei. https://www.comsol.de/blogs/using-the-previous-solution-operator-in-transient-modeling/ The example shown is in time domain, but should work in frequency domain as well. With a little additional algebraic equation you can sum up all power contributions from the harmonics and use this power for the thermal physics. Key is the use of the previous solution in the equation. Good luck, Edgar
Dave Greve Certified Consultant
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Posted: 7 months ago Sep 20, 2023, 6:47 p.m. EDT
Updated: 7 months ago Sep 20, 2023, 6:38 p.m. EDT

I've looked at the file and I'm trying to understand what the goal is.

Is this an attempt to calculate power dissipation and heating for a non-sinusoidal but periodic waveform?

I've looked at the file and I'm trying to understand what the goal is. Is this an attempt to calculate power dissipation and heating for a non-sinusoidal but periodic waveform?

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