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Partial discharge measurements in SF6 and air using phase-resolved pulse-height analysis

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3 Author(s)
Hikita, M. ; Nagoya Univ., Japan ; Kato, T. ; Okubo, H.

Carries out a study on partial discharge (PD) phenomena in SF6 gas and tries to construct a diagnostic system capable of separating noise from observed PD signals for assessing the condition of insulation performance in power apparatus. The authors have constructed a computer-aided PD measuring system which permits a time-sequential data acquisition and phase-resolved pulse height analysis. Using the PD measurement system, the authors measured 60 Hz AC PD in SF6 gas and in air at atmospheric pressure for needle-plane electrodes with three different radii at the tip of the needle, 3, 30 and 500 μm. They proposed particular PD statistical parameters, unbalance ratios U T and Uq of the pulse repetition rate and average of charge, respectively, between positive and negative PD pulses occurring per cycle; these parameters proved to be good indicators to distinguish PD occurring in SF6 from that in air. The mechanism of PD inception was also discussed

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Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:1 ,  Issue: 2 )