Time-Frequency Scalograms of Deep Learning-Based Partial Discharge Classification in Air-Insulated Switchgear Using UHF Detection

Partial discharge (PD) monitoring is essential for the condition assessment of air-insulated switchgear (AIS). This paper presents an experimental framework that acquires ultra-high-frequency (UHF) PD signals corresponding to four representative insulation defects: corona, surface, floating electrode, and triple junction. The collected signals are transformed into time–frequency representations us...