No-Outage Inspection Corner: On-Line Partial Discharge Testing Applications - An Overview

摘要

This column focuses on electrical inspection methods and technologies that are performed while the electrical system remains energized. Although no-outage inspections can be very valuable tools, always remember to comply with proper safety guidelines when conducting energized, on-line inspections. Medium- and high-voltage insulation failure is generally attributed to partial discharge activity which is a partial failure of the insulation that ultimately completely bridges the insulation between electrodes. The partial discharges produce unique phenomena that can be detected by several means. By detecting this activity, corrective actions can be performed so that complete failure is avoided. Electrical equipment should be regularly tested for partial discharge activity in order to prevent failure and increase reliability.