Magnetic field disturbance of partial discharge activity in a cone-plane gap

This paper presents initial partial discharge results for a simple cone-plane gap geometry under applied high voltage when a DC magnetic field is present. Initial phase resolved Phi-q-n results show that the influence of a DC magnetic field as low as 70 mT appears to alter the distribution of the Phi-q-n patterns. This result is important in order to understand the physical PD degradation processes occurring in the presence of the magnetic field. The extent and nature of changes within Phi-q-n patterns when a magnetic field is present will also be discussed as these patterns are often used for the assessment of partial discharge source types and insulation diagnosis.