Partial discharge detection: theoretical and practical aspects

Abstract

The phenomenon of electricification by electrostatic induction is introduced. This fundamental approach allows the concepts of Poissonian and Laplacian induced charge to be clearly developed. These concepts form the necessary basis for partial discharge detection analysis. Thereafter a quantitative theory is developed. This field-theoretical approach furnishes the correct input parameters for the subsequent study of the detection-circuit response, in which the electrodes of the field analysis serve as the input terminals in the circuit analysis. Subsequently the response of a basic partial-discharge detection circuit is examined with reference to the induced-charge signal. It is concluded that the maximum value of this signal will be most accurately determined if a detection circuit with a longtime constant is employed.