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Fifteen years since the first application of the UHF method for partial discharge in gas insulated switchgear, this has become widely used and the preferred method for PD diagnostics in GIS. Same technique is currently starting to be applied for onsite PD testing of Power Transformers. Significant advantages of this UHF method include the reduction of background noise and the possibility of on-line...
Among the different solutions which allow onsite partial discharge measurement in energized power transformers, the UHF technique is gaining general interest. In order to apply this method in existing transformers, it is considered advantageous to design a UHF sensor to be fitted inside the transformer tank. This paper describes the constraints affecting the development of such sensor and the process...
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