How to model overhead power line in FLUX
Dear Experts,
I am in need to model E-fields emanating from a 3-phase, 60 Hz, 80m length overhead power line. Measurement point is on ground. Attempting to model this in steady state AC electric solver and FLUX 3D, I learnt that meshing takes very long and the model gets heavier. Is there any other quick and optimal manner to simulate long power lines in FLUX? Please advise.
Thanks and Best Regards
Balaji
Answers
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@Abdessamed Could you please throw some light on my question above?
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Hello Balaji;
If the cables are straight you can use Flux 2D for that.
Regards
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Farid zidat_20516 said:
Hello Balaji;
If the cables are straight you can use Flux 2D for that.
Regards
Hi Farid,
Thanks for the comment. I tried that and have obtained preliminary values of V/m.
However I am required to find out the the variation of the E field from one pole to the other along the conductor below it. Which will have exponential raise and fall profile to the E-field. That I believe can only be done on a 3D environment. or is it? Is there any other feature of FLUX or Altair Suite that I don't know about. Please advise.
Best Regards
Balaji
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Hi @Farid zidat . Thanks for the comment. I tried modelling the setup in 2D. To my surprise there is a great variation in results between FLUX 3D and FLUX 2D. I used extrusive mesh settings in 3D to mesh the model.
The 2D results also differ from our measured data and another software that I used to benchmark the results i.e, CDEGS (Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis).
Our confidence on FLUX 3D and 2D results is going down.
Could you recommend any further suggestion?
Balaji
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Hello Balaji;
Can you share your Flux project (2D and 3D) as well as all the inputs linked to the measurements.
We use to see differences between Flux and experimental measurements, depending on the considered quantites, we can have from 0% to 10% of error. What is the difference we are talking about here?
Regards
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The differences are in the following % range
FLUX 2D Vs Measured - 20%
FLUX 3D Vs Measured > 90%
FLUX 2D Vs FLUX 3D > 80%
FLUX 2D Vs CDEGS - 20%As you can see, FLUX 3D performed very badly compared to 2D but even 2D isn't perfect.
I'd share the models with you soon.
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Attaching the 2D model. Please kindly review. You might want to unzip the file and open it. It was built in FLUX 2020.
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Hi Balaji,
It seems that my colleague @Lavanya Vadamodala is already in contact with you for the same issue.
She will take a lead on this request, and will answer you as soon as possible.
However let me ask more question:
1- Why using Electric AC steady state application, i thing it is enough to use Electrostatic application.
2- Can you tell me more on the measurements, where are located the measurements points? And what you are measuring? Which device you use to make measurements please?
Regards
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Hi Farid, Thanks for the response. Yes Lavanya has been in contact regarding the issue. I'd continue collaborating with her to clarify this further.
Just to answer your questions, I picked steady state AC Electric application just because the power lines carry AC voltages at 60Hz. As you advised, I'd look to model in electrostatic.
Regarding the measurements, We recorded measurements directly under the 27.6KV distribution lines and 220KV transmission lines few readings at mid-span and few readings at 1m intervals between the poles at 1.5m height (approximate adult human height).
We used https://www.wavecontrol.com/rfsafety/en/products/emf-meter-smp2 instrument.
Best
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Hello Balaji;
Thanks for your answer and inputs.
Yes, i think in your case 2D electrostatic is more adapted for this computation. If you want to use 3D, you will have more assumption to do, and you need bigger volume in order to avoid the impact of the terminals.
We are going to see with Lavany how to increase the accuracy of 2D resutls.
Regards
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Altair Employee