Partial discharge behaviour of transformer liquids and the influence of moisture content

Liu, Z.; Liu, Q.; Wang, Zhongdong; Jarman, Paul; Krause, Christoph; Smith, P. W.; Györe, Attila

doi:10.1109/icdl.2014.6893155

Cited by 21 publications

(13 citation statements)

References 8 publications

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“…It is generally accepted that negative streamers in base oils initiate from electronic avalanches in the liquid phase followed by light emission, a shock wave and the formation of a gas bubble [9][10][11]. The mechanism of initiation of positive streamers is nevertheless less understood [17], although it has been observed to be influenced by moisture content [18].…”

Section: Introductionmentioning

confidence: 99%

Streamer Inception from Ultra-Sharp Needles in Mineral Oil Based Nanofluids

2018

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Positive and negative streamer inception voltages from ultra-sharp needle tips (with tip radii below 0.5 µm) are measured in TiO 2 , SiO 2 , Al 2 O 3 , ZnO and C 60 nanofluids. The experiments are performed at several concentrations of nanoparticles dispersed in mineral oil. It is found that nanoparticles influence positive and negative streamers in different ways. TiO 2 , SiO 2 and Al 2 O 3 nanoparticles increase the positive streamer inception voltage only, whilst ZnO and C 60 nanoparticles augment the streamer inception voltages in both polarities. Using these results, the main hypotheses explaining the improvement in the dielectric strength of the host oil due to the presence of nanoparticles are analyzed. It is found that the water adsorption hypothesis of nanoparticles is consistent with the increments in the reported positive streamer inception voltages. It is also shown that the hypothesis of nanoparticles reducing the electron velocity by hopping transport mechanisms fails to explain the results obtained for negative streamers. Finally, the hypothesis of nanoparticles attaching electrons according to their charging characteristics is found to be consistent with the results hereby presented on negative streamers.

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Section: Introductionmentioning

confidence: 99%

Streamer Inception from Ultra-Sharp Needles in Mineral Oil Based Nanofluids

2018

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“…The remarkable reduction in PDIV was observed in the sample with the presence of water droplet [7]. However, the different results were reported in [3]. The PDIV of synthetic ester and mineral oil of Diala S4 ZX-I type increased with moisture content, whereas that of mineral oil of Gemini X type is equal under dry and moist conditions.…”

Section: Introductionmentioning

confidence: 40%

“…The PD magnitude of all tested oils decreased as the moisture content rose at lower applied voltage, but that of synthetic ester and Gemini X increased with moisture content at 38 kV applied voltage or higher [3]. It is indicative from the mentioned literature that moisture content alters the PD behavior of insulating oil, although its effect, whether the increase in moisture content intensifies PD activities, or vice versa, has not been concluded.…”

Section: Introductionmentioning

confidence: 71%

“…Water is one of a degradation product of oxidized oil as well as that of paper insulation [2]. Moisture ingression could also happen when insufficient dry air entering the transformer's tank, or when there was a leakage on the gasket [3]. In addition, natural ester was reported to attract more water than mineral oil from cellulose in oil/paper insulating system under thermal aged condition [4][5].…”

Section: Introductionmentioning

confidence: 99%

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PD Behaviors of Monoester Insulating Oil under Different Moisture Contents

et al. 2018

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“…The basic properties of these two oils were described in the previous publications [1,[16][17][18][19].…”

Section: Manuscript Received On October 2016 In Final Form XX Month mentioning

confidence: 99%

Pre-breakdown and breakdown mechanisms of an inhibited gas to liquid hydrocarbon transformer oil under negative lightning impulse voltage

Lü

Liu

Wang

2017

IEEE Trans. Dielect. Electr. Insul.

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In this paper, streamer and breakdown phenomena and their mechanisms of an inhibited Gas-To-Liquid (GTL) transformer oil under standard negative lightning impulse voltages were studied. A conventional inhibited mineral oil was also tested as the benchmark. Experiments were carried out in 25 mm and 50 mm point-plane gaps. Streamer and breakdown phenomena of both oils were observed from the streamer inception voltage level up to the voltage level at which fast streamer appears with velocity over 10 km/s. The results showed that the GTL oil has a higher breakdown voltage and a higher acceleration voltage compared to the mineral oil. This is due to the fact that the GTL oil has a much lower aromatic content compared to the mineral oil. The streamer investigations showed that the development of fast streamers in both oils is the consequence of transition from dark streamer channels to bright streamer channels. By comparing with the results obtained under positive polarity [1], the differences in the propagation mechanisms between the fast negative streamers and fast positive streamers were explained.

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Partial discharge behaviour of transformer liquids and the influence of moisture content

Cited by 21 publications

References 8 publications

Streamer Inception from Ultra-Sharp Needles in Mineral Oil Based Nanofluids

Streamer Inception from Ultra-Sharp Needles in Mineral Oil Based Nanofluids

PD Behaviors of Monoester Insulating Oil under Different Moisture Contents

Pre-breakdown and breakdown mechanisms of an inhibited gas to liquid hydrocarbon transformer oil under negative lightning impulse voltage

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