Dear all,
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
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