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Experiments show that electric field promotes to form a vapor locking in a gap with a hot spot and in turn the formation of locked vapor produces the serious reduction of breakdown voltage. Especially it is argued that the dielectric strengh of liquid helium under serious hot spot conditions decreases below that for saturated gas.
In a negative-needle to plane configuration in transformer oil and liquid nitrogen (LN2), current-voltage (I–V) characteristics and liquid velocities were measured. Well-known linear plots of V vs I1/2 were obtained in the space charge limitation (SCL) for I>10−9 A. The liquid motion in SCL is computed from both the Navier-Stokes equation and the continuity equation by the finite difference method...
In a negative razor blade to plane configuration in transformer oil, current-voltage (I–V) characteristics, liquid velocities and streamlines were measured. Linear plots of V vs Il/3 were obtained in the space charge limitation (SCL). The liquid motion in SCL is computed from both the Navier-Stokes equation and the continuity equation for two-dimensions, by the finite difference method. The computational...
Erosion by partial discharge and layer effect on breakdown characteristics of polymeric films immersed in cryogenic fluid were examined. The results obtained are following.
As a result of our experiment the following outcomes are to be made: If c > 0.6 (x > 0.2) no spontaneous crystallization occurs and if c < 0.4 (x < 0.12) only the maximum of density is detected and for this concentration range crystalsization occurs always at temperatures higher than − 40°C. The replacement of 12 % water molecules by glycerol molecules seems sufficient for destroying the...
In spite of a very large dispersion of the experimental results due to the difficulties to make experiments in cryogenic liquids, the space charge convected by flows of such liquids seems to be independant of the Reynolds number, as it was predicted, and the influence of the diameter to be negligible for small values of this parameter. More, the always very high streaming currents observed in hydrogen...
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