Computation of Electric Networks With Nonsinusoidal Periodic Waveforms

Abstract

A description is given of polyphase electric systems and their classification, with special reference to the three-phase system. The computation of a three-phase symmetrical system is described, with special reference to the power of the symmetrical system. Distortions of the sinusoidal form occurring in three-phase networks essentially change the characteristics of the network. It is shown how the phase and line values in networks with distorted sinusoids are computed. At the end, an example is given of how higher harmonics in a certain power supply network are computed by using software simulation, and another example from practice where the results of measuring higher harmonics in a 10 kV power distribution network are shown.