Partial Discharge Location for Cast-Resin Transformer by UHF Partial Discharge Sensor and Pulse Waveform Identification

As the technique of on-line partial discharge measurement gets more precise, the goal of early warning is reached and the insulation breakdown is prevented. Besides the prevention of insulation breakdown, how to avoid the same defected equipement occurs again also attracts one's attention. As the defect is detected at low partial discharge level, the deterioration is at the early stage and the insulation material is possible not to be damaged yet. In such situation, it is hard to find the defect by dissecting defected equipment without partial discharge location. For gas-insulated switchgear and oil-immersed transformer, there are several effective methods for partial discharge location. However, there is no effective method of partial discharge location for cast-resin transformer.…