NDLI: PD occurrence in liquids in ac stressed needle plane gap

Content Provider	IEEE Xplore Digital Library
Author	Grav, T. Lundgaard, L.E.
Copyright Year	2014
Description	Author affiliation: Electr. Power Technol., SINTEF Energy Res., Trondheim, Norway (Lundgaard, L.E.) \|\| Dept. of Phys., Norwegian Univ. of Sci. & Technol., Trondheim, Norway (Grav, T.)
Abstract	Partial discharge (PD) measurement in a needle to plane gap is suggested by IEC used for ranking dielectric liquids. This paper investigates PD behavior in eight liquids using a 20 mm ac stressed needle to plane gap. Parameters varied were tip radius, frequency and voltage. Both discharge phase distributions and pulse sequences were studied. PD occurrence was highly correlated to the frequency of the applied voltage. A higher frequency of 600 Hz gave a higher PD rate than the lower frequencies, like 60 Hz. The tip radius does also affect the PD pattern. The influences from tip radius and frequency indicate a strong correlation between space charges and PD initiation. It was observed that large positive PDs almost always was preceded and followed by a smaller negative PD in the neighboring half cycles, indicating an influence from charges of opposite polarity created in the previous half cycle. Exposing the gap to X-rays gave a PD burst for both polarities. This indicates that electrons are needed for initiation of PDs and that lack of electrons is the reason for low occurrence rate of positive PDs.
Starting Page	1
Ending Page	5
File Size	1530232
Page Count	5
File Format	PDF
ISBN	9781479920631
DOI	10.1109/ICDL.2014.6893092
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-29
Publisher Place	Slovenia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Partial discharges X-rays Programmable logic arrays Acceleration pattern analysis Partial dischargess dielectric liquid insulation IEC X-ray starting electrons space charges
Content Type	Text
Resource Type	Article

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