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Induced current in a power cable sheath
Posted Feb 12, 2013, 11:05 a.m. EST Low-Frequency Electromagnetics Version 4.3a 0 Replies
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I'm probably missing something obvious, but I am having trouble creating a good model of a single-phase power cable. Herein I want to calculate the induced current in a (copper) cable sheath due to the current flowing through the conductor.
I am using Comsol V4.3a, with the magnetic field interface (2D planar) and a time-harmonic study (it's a 50 Hz power cable).
I specify the conductor current using a single-turn coil domain and get an induced current in both the conductor and the cable sheath (so far so good, I think).
The strange thing is that the induced currents depend strongly on the size of my domain. If I increase the outer radius of my domain, the induced currents increase, and vice versa.
I have tried using an external current density instead of the single-turn coil domain, but get the same dependence on the domain size.
What am I doing wrong here? Any help would be greatly appreciated.
I have attached the model.
With regards,
Frank
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Hello Frank van Minnen
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