Efficient model for computing high-impedance fault generated harmonic propagation effects on radial power distribution feeders

A description is given of the theory and application of an efficient computer model developed for computing the effects of harmonics and noise generated from high-impedance faults placed at arbitrary points on a feeder. By the efficient use of information computed and stored during the first step of the computation, the theory permits exact computation of propagation from any one point to any other point on the feeder using at most nine three-by-three matrix operations, irrespective of the number of sections on the feeder. Also considered are the generation and nature of harmonics and noise in high-impedance faults, their relationship to each other and to the fault power. Procedures for determining the propagation of each of these components using the approach specified are presented together with considerations necessary to computing and combining the effects from several spectral bands