Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage
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In this paper, the results of comparative studies on streamer propagation and breakdown in a point-insulating plate electrode system in mineral oil and two ester liquids were presented for a 10-mm gap and a positive standard lightning impulse.Abstract:
This article presents the results of comparative studies on streamer propagation and breakdown in a point-insulating plate electrode system in mineral oil and two ester liquids. The studies were performed for a 10-mm gap and a positive standard lightning impulse. The work was focused on the comparison of light waveforms registered using the photomultiplier technique. The results indicated that both esters demonstrate a lower resistance against the appearance of fast energetic streamers than mineral oil. The reason for such a conclusion is that the number of lightning impulses supplied to the electrode system for which the above-mentioned fast streamers appeared at a given voltage level was always higher in the case of ester liquids than mineral oil. In terms of breakdown, the esters tested were assessed as more susceptible to the appearance of breakdown in the investigated electrode system. The number of breakdowns recorded in the case of esters was always greater than the corresponding number of breakdowns in mineral oil. This may be supposed on the basis of the obtained results that imply that, in both synthetic and natural ester, the formed breakdown channel, which bridged the gap through the surface of pressboard plate, is characterized by higher energy than in the case of mineral oil.read more
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References
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Breakdown and prebreakdown phenomena in liquids
TL;DR: In this paper, a comprehensive account of streamer propagation in dielectric fluids in point-plane geometries is presented, and the relation between shock wave and streamer velocities is investigated.
Journal ArticleDOI
Positive streamer propagation in large oil gaps: experimental characterization of propagation modes
Olivier Lesaint,G. Massala +1 more
TL;DR: In this article, the authors presented an experimental study of positive streamer propagation in mineral oil, in large point-plane gaps under impulse voltage, concerning the influence of gap distance (/spl les/35 cm), and voltage from streamer inception up to large overvoltages.
Journal ArticleDOI
Streamer characteristic and breakdown in synthetic and natural ester transformer liquids under standard lightning impulse voltage
Qiang Liu,Zhongdong Wang +1 more
TL;DR: In this article, experimental studies on streamer and breakdown in synthetic and natural esters were conducted, and it was found that fast streamer led breakdown becomes statistically dominant in a large gap under lightning impulse and ester liquids have lower breakdown voltage than mineral oil due to their low tolerance to fast streamers.
Journal ArticleDOI
Vegetable-oil-based dielectric coolants
TL;DR: In this article, the authors report the latest findings on dielectric systems using natural ester (vegetable oil) fluids, and a novel blend of base oils and additives were developed to overcome this potential handicap.
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Experimental investigations on insulating liquids for power transformers: Mineral, ester, and silicone oils
TL;DR: In this article, the dielectric strength, electrostatic charging tendency (ECT), ageing stability, gassing tendency, heat transfer efficiency and stray gassing issue of mineral and silicone oils, synthetic and natural esters are analyzed and discussed.
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