Propagation Property of Partial Discharge Induced Electromagnetic Wave in Power Transformer and Comparison of UHF Sensor Characteristics

摘要

This paper deals with propagation characteristics of electromagnetic (EM) waves emitted by partial discharges (PDs) in air for a transformer tank model. The EM waves were detected with UHF sensors installed on the internal surface of the model tank. Simulation using a finite difference time domain (FDTD) method was also performed to closely discuss the experimental results. Moreover, characteristics of two kinds of UHF sensor were compared for frequency spectra of PD signals.