NDLI: Transition of the dominant charge accumulation mechanism at a Gas-solid interface under DC voltage

Content Provider	IET Digital Library
Author	Luo, Yi Tang, Ju Pan, Cheng Pan, Zijun Meng, Guodong
Abstract	In this study, a simulation model of surface charge accumulation on a basin-type insulator was constructed. Three accumulation mechanisms were considered, i.e. electrical conduction within the gas, electrical conduction through the insulator and along insulator surface. For the gas electrical conduction, the generation, diffusion, drift and recombination of charge carriers in SF6 were taken into consideration. The surface conductivity is treated by directly defining parameters instead of surface thin layer, which improves the calculation range of surface conductivity in ion flow model. Additionally, surface charge accumulation characteristics with different parameters were studied. The results indicated that the polarity of surface charge would change with the ion pair generation rate, volume conductivity and surface conductivity. Based on the surface charge and electric field distributions, it was found that the dominant surface charge accumulation mechanism changes from volume conduction to gas conduction as the ion pair generation rate increases. When the volume conductivity increases from 1 × 10−19 to 1 × 10−14 S/m, the dominant mechanism changes from gas conduction to volume conduction. Furthermore, as the surface conductivity increases, the dominant mechanism is surface conduction. The proposed study is helpful for understanding the mechanism of surface charge accumulation and provides insight into charge accumulation inhibition.
Starting Page	3078
Ending Page	3088
Page Count	11
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 15, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1523
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-05-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Basin-type Insulator Charge Accumulation Inhibition Charge Carrier Recombination Connector DC Voltage Diffusion Electric Field Distributions Gas Electrical Conduction Gas-solid Interface Gaseous Insulation, Breakdown And Discharges Inorganic Insulation Insulating Material Insulator Insulator Surface Ion Flow Model Ion Pair Generation Rate Power Line Supports SF6 Insulation Surface Charge Accumulation Characteristic Surface Charge Polarity Surface Charging Surface Chemistry Surface Conduction Surface Conductivity Surface Recombination Volume Conduction
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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