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In liquid nitrogen insulation, the corona inception voltage is high with barrier in the electrode gap. The breakdown voltage of needle-plane gap has increased with barrier positioned near high voltage needle electrode. The current signal injected due to corona discharge in liquid nitrogen insulation, at the point of its inception and during streamer formation, have rise time, in negative and positive...
Since the discovery of high-temperature superconductor (HTS), liquid nitrogen(LN2) has not been only utilized as a coolant of superconducting electric equipment but also as an insulation material in cryogenic environment due to its dielectric performance. It also has a lot of advantages over other cryogenic liquid such as less expense and harmless substance, thus it has been widely used in the development...
Non-uniform field gaps partially immersed in liquid coolants are essential components in any cryogenic or superconducting apparatus. We have investigated the dc, ac and impulse dielectric breakdown characteristics of non-uniform field gaps partially immersed in liquid nitrogen together with those completely immersed in liquid or cryogenic gaseous nitrogen. It is found that the Sumoto effect appears...
With the current interest in cryogenic superconducting cables, there has been a demand for low loss dielectrics so that insulator losses do not become greater than the conductor losses.1 Since not much is known about the losses of polymer films at cryogenic temperatures, selection of a suitable insulation system for a superconducting power cable being designed by Brookhaven National Laboratory has...
Technical and economic considerations indicate that it is advantageous to operate cryogenic underground cables at high voltages in an optimum range between approximately 100 and 500 kV. Several programs under way in the United states for the development of high voltage superconducting or cryoresistive cables were recently summarized by Belanger.1 An appendix to his paper summarizes the most important...
The purpose of this work was to provide the designers of cryogenic apparatus with the necessary basic data for the choice of insulation materials, particularly for use at high voltages. In this report, the main results have been gathered in order to initiate a discussion.
This paper represents a brief excursion into the considerable volume of literature on the electrical properties of cryogenic liquids. Sophisticated theoretical models of charge-motion are available which give fair agreement with experimental results but the situation with regard to breakdown is not so satisfactory. Even allowing for the amount of published work on these liquids the data on the impulse...
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