A Calculation Method of Dielectric Strength of High-Voltage Electrical Equipment Based on Gas Decomposition Products

Abstract

The invention discloses a method for calculating the insulation strength of high-voltage electrical equipment based on gas decomposition products. First, the molecular structure S of the gas filled in the high-voltage electrical equipment and its elastic collision and inelastic collision reaction system R in the process of partial discharge are calculated; and then According to the reaction system R, calculate the evolution law of the gas decomposition products under partial discharge; finally, according to the evolution law of the gas decomposition products, calculate the insulation strength of the gas (E / N) cr . The invention solves the problems in the prior art that the non-equilibrium effect is not considered in the research on the insulation characteristics of high-voltage electrical equipment, and particles with incomplete electron collision cross-section data are ignored, resulting in inaccurate evaluation and online monitoring of the insulation operation status of high-voltage electrical equipment .

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrics, and in particular relates to a method for calculating the insulation strength of high-voltage electric equipment based on gas decomposition products. Background technique [0002] As an important guarantee for the safe operation of the power system, SF 6 The number of high-voltage electrical equipment (circuit breakers, GIS, etc.) that replaces gas as an insulating and arc-extinguishing medium increases at a rapid rate with the increasing capacity of the power system, but factors such as partial discharge promote the decomposition of the gas-insulating medium, resulting in The product with low dielectric strength and active chemical properties will lead to a decrease in the dielectric strength of the equipment and seriously threaten the safe operation of the equipment. [0003] The gas insulation strength can be converted to the critical breakdown field strength (E / N) cr Indicate...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for calculating the insulation strength of high-voltage electrical equipment based on gas decomposition products, which solves the problem that the non-equilibrium effect is not considered in the study of the insulation characteristics of high-voltage electrical equipment in the prior art, and the electron collision cross-section data is ignored. Intact particles lead to inaccurate evaluation of insulation operation status of high-voltage electrical equipment and online monitoring

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