Experimental Analysis of Ultra-High-Frequency Signal Propagation Paths in Power Transformers

Ultra-high-frequency (UHF) partial discharge (PD) monitoring is gaining popularity because of its advantages over electrical methods for onsite/online applications. One such advantage the possibility three-dimensional PD source localization. However, it necessary to understand signal propagation and attenuation characteristics in transformers improve Since are available a wide range ratings geometric sizes, ascertain similarities differences UHF across different designs. Therefore, this contribution, two 300 MVA analyzed compared based on experiments. The have same rating but internal structures. It should be noted that oil drained out these tests. Additionally, simulation model one built validated experimental results. Subsequently, used analyze electromagnetic wave inside tank. Analysis data shows distance-dependent similar case both can well represented by hyperbolic equations, thus indicating with even if they