Gas medium arc extinguishing capability evaluation method and system

A gas medium and arc extinguishing technology, applied in the field of electrical switchgear, can solve the problems of finding and exploring new environment-friendly arc extinguishing gas medium, and achieve the effects of saving manpower and material resources, improving efficiency and eliminating influence

Inactive Publication Date: 2021-01-15
STATE GRID ELECTRIC POWER RES INST +5
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AI Technical Summary

Problems solved by technology

The theoretical research on the arc extinguishing performance of a single gas will inevitably fail to provide help for the search and exploration of new environmentally friendly arc extinguishing gas media

Method used

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  • Gas medium arc extinguishing capability evaluation method and system
  • Gas medium arc extinguishing capability evaluation method and system
  • Gas medium arc extinguishing capability evaluation method and system

Examples

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specific Embodiment 1

[0078] Trifluoroiodomethane (CF 3 1) gas is a kind of environment-friendly insulating gas that has received extensive attention in recent years, and this gas and SF 6 The same, has excellent insulation properties and dielectric strength, as well as the advantages of many physical and chemical properties: colorless, tasteless, odorless, non-flammable, stable chemical properties, good oil solubility and material compatibility, is considered to be the traditional Freon refrigeration One of the ideal substitutes for agent components and fire extinguishing material "halon". In terms of environmental characteristics, its GWP value and carbon dioxide CO 2 Comparable, well below SF 6 . CF 3 1 pure gas is an example, according to the method provided by the invention, its arc extinguishing performance is studied and explained:

[0079] (1) For ambient pressure 1atm, CF at ambient temperature 300K 3 I pure gas, decomposition may produce 35 kinds of plasma, including:

[0080] 14 n...

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Abstract

The invention discloses a method for evaluating the arc extinguishing capability of a gaseous medium. The method comprises the following steps of (1) calculating the local thermal equilibrium state component distribution of given gas at a certain temperature and air pressure; (2) obtaining various molecular collision section parameters in gas components before and after arcing; and (3) solving a Boltzmann equation to calculate electron groups and transport parameters of the gas before and after arcing, and obtaining a reduced electric field critical value (E/N)lim of breakdown of the electricnegative gas. The gas medium arc extinguishing capability evaluation method provided by the invention is high in efficiency, and can eliminate the influence of external conditions such as different equipment structures and arc extinguishing forms in experiments and traditional simulation means on experiment results.

Description

technical field [0001] The invention relates to a gas medium arc extinguishing capability evaluation method and system, belonging to the technical field of electrical switchgear. Background technique [0002] The ideal gas medium in electrical switchgear needs to have strong arc breaking ability in addition to good dielectric strength. The arc extinguishing performance of gas is a more complex process than insulation breakdown, involving many aspects of thermodynamics and electrical reactions. So far, the electrical industry has not been able to find out the theoretical measure of the gas arc breaking ability, and the evaluation of the gas arc breaking ability can only be realized through the high-power current breaking test. This kind of test is often destructive, which not only consumes a lot of manpower and material resources, but also cannot rule out the influence of various external conditions such as different equipment structures and arc extinguishing forms in the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/25G16C10/00G06F111/04G06F119/08G06F119/14
Inventor 蔡凡一赵小令谭东现周柏杰薛健赵谡钟蕊霜肖登明王之浩周志成杨景刚胡正勇邓先钦
Owner STATE GRID ELECTRIC POWER RES INST
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