Correct calculation of S (apparent power) to assess critical lines

[gplssm]

Currently, we calculate maximum allow apparent power for lines by S = sqrt(3) * I_max_th * U_N. We take this value to assess if a line's current carrying capacity is exceeded.

In a discussion with @jochenbuehler and @birgits we starting doubting to use U_N the calculation method. @jochenbuehler says we have to apply the operational voltage at the respective line to calculate apparent power, but he is not sure.

[boltbeard]

I can confirm that @jochenbuehler is correct, but I am not sure if this has already been implemented or if this is yet to be done.

[mltja]

I think it is not solved.