General criteria for the stochastic sum of measured harmonics at plant busses

Criteria are presented for constructing the probability density and cumulative functions of the amplitudes and phases of the harmonic currents and voltages at plant buses when the harmonic vs. time behavior in the plant branches is detected by on field measurements. In particular, the convolution and Monte Carlo methods are applied and the relevant results compared on the basis of simulated and experimental samples. The methods do not reply on assumptions pertinent to any kind of probability function. The significance of providing harmonic quantities associated with the occurrence probability is considered. Examples of applications based on real plant measurements and comparisons of the procedures used are included.<>