Digital computer system for measurement of partial discharges in insulation structures

A digital discharge analyzer has been built for continuous and multiparameter registration of partial discharges. The measurements indicate that there are significant differences in the behavior of different discharge parameters for different voids. The registration of phase-position quantities is shown to give more information than just the registration of discharge magnitude versus time. Statistical analysis is shown to be a good tool for describing changes of the phase-position quantities. It is also demonstrated that skewness and kurtosis can discriminate among flat, narrow, and square cylindrical voids