Maximum Heating and Insulation Stress on Untransposed Lines with Unbalanced Harmonic Distortion

Efficient numerical methods are presented to determine the magnitude and location of maximum overall rms current (heating), peak voltage (insulation stress) and distortion factor on untransposed three-phase transmission lines under nonsinusoidal as well as unbalanced conditions. The methods which are an extension of recently reported algorithms, guarantee convergence to the global solution. Simulation results of an unsymmetrical three-phase transmission line are included.