PARTIAL DISCHARGE DETECTION - THEORETICAL AND PRACTICAL ASPECTS

The phenomenon of electrification by electrostatic induction is introd uced. 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. Thereaft er a quantitative theory is developed. This field-theoretical approach furnishes the correct input parameters for the subsequent study of th e detection-circuit response, in which the electrodes of the field ana lysis serve as the input terminals in the circuit analysis. Subsequent ly the response of a basic partial-discharge detection circuit is exam ined with reference to the induced-charge signal. It is concluded that the maximum value of this signal will be most accurately determined i f a detection circuit with a long time constant is employed.