Journal ArticleDOI
Breakdown of Transformer Oil
Y. Kawaguchi,H. Murata,M. Ikeda +2 more
TLDR
In this paper, the authors tried to express the breakdown stress of transformer oil as a function of stressed oil volume, but their results were limited to their respective electrodes, and the latters made it difficult to predict break-down voltage from electrostatic field, as made for air and S F6 gaps.Abstract:
Breakdown of transformer oil is affected not only by electrostatic field configurations, but also by many other factors. The latters make it difficult to predict break- down voltage from electrostatic field, as made for air and S F6 gaps. Alternatively, many experimenters tried to express the breakdown stress of oil as a function of stressed oil volume. But, results are limited to their respective electrodes.read more
Citations
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Journal ArticleDOI
Breakdown of transformer oil
TL;DR: Some of the factors affecting the dielectric strength of transformer oil are investigated in this article, including the stabilization phenomenon, oil and electrode pretreatment, the effect of oil velocity, capacitance parallel to the test cell, and the effects of electrode area and gap spacing.
Journal ArticleDOI
Weibull statistical analysis of area and volume effects on the breakdown strength in liquid nitrogen
TL;DR: In order to examine the area and the volume effects on breakdown strength in liquid nitrogen (LN/sub 2/), this paper measured dc and ac breakdown voltages in LN/ sub 2/ with sphere to plane and coaxial cylindrical electrode configurations and carried out statistical analysis of the experimental results using the Weibull distribution.
Journal ArticleDOI
Statistical Dielectric Degradation of Large-Volume Oil-Insulation
TL;DR: In this paper, a study was carried out under well defined conditions of the oil quality, particularly with regard to the degree of particle contamination, and the results indicated that both the electrode area and the stressed oil volume can affect the dielectric strength of transformer oil, with the stressed-oil-volume effect being most pronounced under particle contamination conditions.
Journal ArticleDOI
An assessment of the physical basis for the application of design criteria for dielectric structures
TL;DR: In this article, the use of design criteria for assessing the stresses to which composite dielectric structures are subjected implies careful and informed application, and the convention required in the application of these criteria is examined in the light of the physical processes expected in an oil/cellulose transformer structure and related to an equivalent stressed-oil-volume theory of breakdown.
Journal ArticleDOI
Electrode Design for Testing in Uniform Field Gaps
TL;DR: In this article, the efficiency of producing uniform fields in the test gap was evaluated for practical electrode configurations corresponding to the plane, the Rogowski and the Bruce profiles, and the results obtained show a pronounced end effect at plane-profile electrodes.
References
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Journal ArticleDOI
Criteria for Spark Breakdown in Sulfur Hexafluoride
TL;DR: In this paper, the mechanisms of spark breakdown in SF6 and other electronegative gases are discussed, and quantitative criteria are derived for the Townsend type and the streamer type of breakdown in nonuniform fields.
Journal ArticleDOI
Breakdown of liquid dielectrics
TL;DR: In this paper, a study was made of electrical breakdown of a liquid (hexachlorodiphenyl) the viscosity of which is very dependent on temperature, and it was shown that in uniform fields breakdown results from formation and growth of a vapour bubble in the liquid.
Journal ArticleDOI
Calculation of Spark Breakdown or Corona Starting Voltages in Nonuniform Fields.
TL;DR: In this paper, a quantitative breakdown criterion for use in highvoltage design is derived by which spark breakdown or corona starting voltages in nonuniform fields can be calculated, and it is shown how it can give a very detailed and accurate description of known breakdown characteristics.