Statistical Characteristics of Partial Discharges from a Rod-Plane Arrangement

Partial discharges (PDs) in high-voltage insulating systems originate from various local defects, which degrades the insulation and reduces the remaining lifetime of equipment. In order to ensure reliable operation of HV equipment, it is important to relate the observable statistical characteristics of PDs to the properties of the defect and ultimately to determine the type of the defect. With a PD source of rod-plane arrangement, various discharge patterns are obtained and investigated such as parameters of individual PD current pulse, parameters of PD pulses repetition rate and parameters of PD current pulses together with instantaneous value of applied voltage Using a new PD detector, the results are carefully analysed leading to some useful conclusions. The techniques developed are to be used on mica-epoxy insulation of generator stator windings. 1