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Your search keyword '"three-tier concentric circle structure"' showing total 2 results
Start Over Descriptor "three-tier concentric circle structure" Topic electron energy distribution
2 results on '"three-tier concentric circle structure"'

1. Charge accumulation characteristic on polymer insulator surface under AC voltage in air and C(4)F(7)N/CO(2) mixtures

Author

Dayu Li, Guixin Zhang, Tianyu Wang, and Yicen Hou

Subjects
surface potential, space charge, electrodes, surface charging, electron attachment, organic insulating materials, gas mixtures, polymer insulators, charge accumulation characteristic, polymer insulator surface, ac voltage, surface potential measurement, inversion algorithm, truncated phase, gis-gil operation, high voltage surface charge, heptafluorobutyronitrile-carbon dioxide mixtures, needle-plate electrode structure, charge distribution, three-tier concentric circle structure, c(4)f(7)n-co(2) gas mixtures, voltage amplitude, electron attachment cross-section, electron energy distribution, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Electricity, QC501-721
Abstract

Charge accumulation has always been a problem for the safe operation of gas insulated switchgear (GIS)/gas insulated transmission line (GIL) both under AC and DC. It is of great significance to investigate the behaviour of surface charge under high voltage. In this study, the charge distribution characteristics and accumulation mechanism on insulator surface in air and heptafluorobutyronitrile/carbon dioxide (C(4)F(7)N/CO(2)) mixtures under AC voltage are studied via the means of surface potential measurement and inversion algorithm, combined with the improved method of controlling the truncated phase of AC voltage. The results show that under the needle–plate electrode structure, charge distribution on the insulator surface presents a three-tier concentric circle structure both in air and C(4)F(7)N/CO(2) gas mixtures, and the charge composition of the innermost circle is closely related to the truncated phase of AC voltage. Under the same amplitude of voltage, the range of charge distribution on insulator surface in C(4)F(7)N/CO(2) mixtures is smaller than that in air, with the negative charges domination. It is suggested that the characteristic of charge distribution in C(4)F(7)N/CO(2) mixtures is related to the larger electron attachment cross-section of C(4)F(7)N gas in a wide range of electron energy distribution.

Published
2020
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2. Charge accumulation characteristic on polymer insulator surface under AC voltage in air and C 4 F 7 N/CO 2 mixtures

Author

Dayu Li, Guixin Zhang, Tianyu Wang, and Yicen Hou

Subjects
electron energy distribution, surface potential, Materials science, charge accumulation characteristic, lcsh:QC501-721, Analytical chemistry, Energy Engineering and Power Technology, surface potential measurement, Insulator (electricity), electron attachment, charge distribution, heptafluorobutyronitrile-carbon dioxide mixtures, c(4)f(7)n-co(2) gas mixtures, polymer insulators, lcsh:Electricity, organic insulating materials, Surface charge, Electrical and Electronic Engineering, electron attachment cross-section, high voltage surface charge, polymer insulator surface, Charge density, High voltage, truncated phase, gis-gil operation, Space charge, electrodes, inversion algorithm, Amplitude, surface charging, ac voltage, three-tier concentric circle structure, Electrode, space charge, lcsh:Electrical engineering. Electronics. Nuclear engineering, needle-plate electrode structure, voltage amplitude, lcsh:TK1-9971, gas mixtures, Voltage
Abstract

Charge accumulation has always been a problem for the safe operation of gas insulated switchgear (GIS)/gas insulated transmission line (GIL) both under AC and DC. It is of great significance to investigate the behaviour of surface charge under high voltage. In this study, the charge distribution characteristics and accumulation mechanism on insulator surface in air and heptafluorobutyronitrile/carbon dioxide (C 4 F 7 N/CO 2 ) mixtures under AC voltage are studied via the means of surface potential measurement and inversion algorithm, combined with the improved method of controlling the truncated phase of AC voltage. The results show that under the needle–plate electrode structure, charge distribution on the insulator surface presents a three-tier concentric circle structure both in air and C 4 F 7 N/CO 2 gas mixtures, and the charge composition of the innermost circle is closely related to the truncated phase of AC voltage. Under the same amplitude of voltage, the range of charge distribution on insulator surface in C 4 F 7 N/CO 2 mixtures is smaller than that in air, with the negative charges domination. It is suggested that the characteristic of charge distribution in C 4 F 7 N/CO 2 mixtures is related to the larger electron attachment cross-section of C 4 F 7 N gas in a wide range of electron energy distribution.

Published
2020

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