Infinite elements problem in AC/DC modul

Hi all,

I have problem concerning of "Infinite
Elements" in AC/DC modul. I know there are couple of discussion about this but this is still unclear to me. I have read the manual and I followed the instructions.

It is desired to make just a simple 2D model of the wire with high
potencial. The surrounding material is the air. Around the air the
Infinite Elements are imposed. I have printed a line graph of the norm of
electric field (the line goes from the edge of the wire to the external
edge of the model in radial direction). In the enclosured pdf file you can
find the diffrencies between the solution with and without the infinite
elements. The meshing can also be seen.

There are two basic problems: 1-The continuity of the curve, 2-The maximum
value of the norm of the electric field - it is about 4(5) times higher if
you don't use the infinite elements layer.

So, please explain to me where the mistake could be? Is it in bad Infinite
elements understanding or is their using just unsuitable for these kind of
problems?

What is realy interesting, as you could notice in the enclosure file, the
same problem appears also in the example model from the MODEL LIBRARY: "parallel wires". I have
made a similar line graph (for the norm of the magnetic field) and you can
see the similar discontinuity. Without infinite elements the line is
perfectly smooth. However, there is not so big difference between the
maximal values as in my model...

Please could somebody to clear up to me these kind of problems?

Thank you very much!

Katarina