1997
DOI: 10.1109/94.590883
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Breakdown mechanism of liquid nitrogen viewed from area and volume effects

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Cited by 51 publications
(16 citation statements)
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“…It was known that the breakdown voltage of point-to-plane electrode was higher than that of plane-to-plane electrode due to the higher bubble stagnation between the uniform electrode that that of non-uniform electrode in [6]. And the increasing area and volume of electrode causes the reduction of breakdown voltage in [7]. In our test, the breakdown strength in uniform field configurations with low density of bubbles was higher than that of non-uniform field configurations.…”
Section: A Ac Overvoltage Testscontrasting
confidence: 68%
“…It was known that the breakdown voltage of point-to-plane electrode was higher than that of plane-to-plane electrode due to the higher bubble stagnation between the uniform electrode that that of non-uniform electrode in [6]. And the increasing area and volume of electrode causes the reduction of breakdown voltage in [7]. In our test, the breakdown strength in uniform field configurations with low density of bubbles was higher than that of non-uniform field configurations.…”
Section: A Ac Overvoltage Testscontrasting
confidence: 68%
“…A rather large difference between positive and negative initiation fields was measured in LN2 in point-plane gaps: initiation fields are 40% higher in positive polarity [4]. This agrees with the behavior observed in this study, as well as in [7]: only negative streamers are. seen.…”
Section: Initiation Fieldssupporting
confidence: 91%
“…However, other mechanisms (not clearly identified) such as electrode surface state are probably also involved to produce this effect. The calculated field values agree with previous ,.measurements of breakdown fields in LN2 with similar electrode surface subjected to high field (some mm') [7]. The lowest field values (some 100kVicm) are unable to trigger streamers directly, and it is necessary to consider the influence of surface defects or particles that can locally enhance the field to some MV/cm to explain streamer initiation.…”
Section: Initiation Fieldssupporting
confidence: 80%
“…Liquid nitrogen has a high dielectric strength, comparable to dielectric liquids at room temperature [1]. Liquid nitrogen breakdown data displays volume and area effects and are dependant on other parameters including purity, electrode material and surface condition [2]. Due to a narrow liquid temperature range and low latent heat of vaporization the cryogenic liquid insulation suffers from the increased potential of density change to vapour.…”
Section: Introductionmentioning
confidence: 99%