Learning Forum

[Saif Elgalaly]

When plotting the electrical field magnitude, I get maximum strengths of over 30kV/cm, when it should be around 5-7kV/cm.
1) It seems that a single node of the generated mesh generates a really large potential difference that translates to the unusually high electrical field strengths. 
2) Increasing the mesh resolution increases the magnitude of the electrical field strength at the same point. So either it has no effect on the potential but it shrinks the distance between the potential differences?

How can I fix this problem?


setup details: It is a high voltage silicone insulator with pollution modeled on on side.
materials used: {attached as an image} with the pollution having {relative permitivitty: 7.1, conductivity: 1S/m}
excitation: AC 100kVp on the terminal in the top of the figure.

[Timos]

The single node that you mention is not the reason for the increased electric field. By having a finer mesh, you will get a more detailed analysis. This is why increasing mesh resolution leads also to an increased magnitude of the electric field (in specific areas). The expectedly increased magnitude of electric field is seen because electric field lines tend to concentrate at the edges of a conductive object (field enhancement) and in your case the conductive object is the distribution of pollution on the insulator.

[Xuxu Xuxu]

 

I am simulating 3D electric field on ceramic insulator covered with pollution layer on ansys maxwell but after changing the conductivity of the pollution layer to create different pollution levels, the electric field does not change. with the pollution having {relative pemittivity: 7.1, conductivity: 0.000005 S/m and 0.00001 S/m and 0.00003s/m.The thickness of the contamination layer is 1mm.Do you know the reason why?