Introduction of multi line charge

To calculate the maximum field strength on the individual sub-conductors of a phase bundle, the possibility of several line charges per sub-conductor is to be introduced.

The user should be able to choose whether to calculate with one line charge and the correction formula (already implemented) or with several line charges (and matching points) n.

To determine the maximum field strength around the circumference, the highest field strength at the matching points of each conductor is selected.

The mirror charges are realized with the same number of line charges.

The size of the matrix, which is set up for the field calculation with the equivalent charge method, increases by the factor n.

The choice of positions for the charges is described in the attachement:

2025-01-18_Mulri_line_charges.pdf

The default number of line charges is n=12. When selecting the positions according to the recommendation in the attachment, this number is by far sufficient based on our own investigations.

However, it should be possible to select the number between n = 6 and 60 using the parameters setting in the json file.

By definition, the decisive field strength for the corona sound level calculation of one phase bundle is the mean value of the maximum field strengths of each individual conductor for both calculation options.