Partial Discharge Test Specimen for Insulation Diagnosis Using Radio Interferometer System

Superconducting Maglev systems require a huge number of ground coils will be required for outdoor use over an extended period. Therefore, it is necessary to secure efficient maintenance during the operation of ground coils. We use partial discharges measurement as a method for evaluating the insulation performance of propulsion coils. Partial discharge is a small dielectric breakdown phenomenon that occurs in the void inside mold resin insulation of the propulsion coil. It is known that broadband electromagnetic waves are emitted when partial discharge occurs. Under such an engineering background, insulation diagnosis methods focusing on partial discharge were verified. Partial discharge can be used as physical indicator to predict insulation failure of the propulsion coils. In this paper, we developed a partial discharge test specimen to evaluate insulation performance. A test using a partial discharge test specimen was performed, we composed configuration capable of detecting a partial discharge using radio interferometer system.