Propagation on Polyphase Lossy Power Lines: A New Parameter Sensitivity Model

The mathematical model of the transmission syst. em takes into account the dependence of the line and earth parameters on the frequency. The solution of the propagation matrix equations for a polyphase lossy power line, is obtained by applying modal analysis. In order to define the effects of parameter variations on modal quantities, a new sensitivity model is presented. The al gorithm for the calculation of the modal sensitivity functions is suitable for easy computer implementation. The sensitivity analysis of the modal attenuation constants is carried out for horizontal lines with ground wires: the normalized sensitivity functions presented are of general validity. The computation of the niodal attenuation constants, carried out with the "exact" and the "approximate" method, leads to values whichprove to be in closer agreement with experimental results already known.