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A non-intrusive partial discharge measurement system based on RF technology

Portugues, I. and Moore, P.J. and Glover, I.A. (2003) A non-intrusive partial discharge measurement system based on RF technology. In: IEEE-Power-Engineering-Society General Meeting 2003, 2003-07-13 - 2003-07-17.

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Abstract

Conventional electrical measurements of PD are performed with detectors connected to the plant. This paper describes research conducted in conjunction with the National Grid Company and the Radiocommunications Agency for the radiometric detection of partial discharge sources via a novel non-contact digital method. The equipment uses an antenna sensor and reference voltage inputs which are directly sampled at 2.5 GHz. Results for by laboratory tests involving air, SF6 and oil discharges are presented. The results include the waveform, average frequency spectrum and pulse count distribution. A proposal is made for the characterisation of the recorded impulses from these different breakdown effects based on analysis of the spectra and pulse count distributions.