The influence of surface charge accumulation on flashover voltage of GIS/GIL basin insulator under various voltage stresses

Qi, Bo; Gao, Chunjia; Li, Chengrong; Xiong, Jun

doi:10.1016/j.ijepes.2018.08.036

Cited by 57 publications

(30 citation statements)

References 11 publications

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“…Reasonable and appropriate boundary conditions are helpful to solve the surface charge accumulation model under voltage polarity reversal. The boundary conditions of the Poisson equations (4) and (8) are set according to the Dirichlet condition, i.e. the potential φ HV of the inner conductor and the potential φ GND of the grounded shell are, respectively, set as…”

Section: Boundaries and Initial Conditionsmentioning

confidence: 99%

“…Under this circumstance, the application of DC GIS/GIL in the construction of HVDC transmission systems has received extensive attention [2,3]. However, due to the partial discharge and other factors [4], a large number of charges accumulate on the basin-type insulator in GIS/GIL under the HVDC condition, which will distort the electric field on the insulator and reduce its flashover voltage [5][6][7][8][9]. This has become a fundamental problem that restricts the development and application of DC GIS/GIL technology.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of surface charge and electric field distributions on basin‐type insulator in GIS/GIL due to voltage polarity reversal

et al. 2020

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In this study, a simulation model of surface charge accumulation has been established. The model considers three accumulation ways, i.e. electrical conduction within the gas, through insulator volume and along the insulator surface. The generation, diffusion, drift and recombination of charge carriers are also taken into account. Based on it, the influence of polarity reversal, reversal time on surface charge and electric field distribution on a basin-type insulator are studied. The polarity of the surface charges and the direction of the electric field change after the voltage polarity reversal. When the preload voltage is equal to reversal voltage, the surface charge and the electric field distributions at steady state before and after voltage polarity reversal are all the same with opposite sign, and not affected by the reversal time. However, the time to reach the steady state varies with different reversal time. The steady-state surface charge and electric field increased with the rise of reversal voltage. The transient normal and tangential electric field would not exceed the value of the steady state, which means voltage polarity reversal has no additional influence on insulation performance. This research can provide guidance to the design and manufacture of DC GIS/GIL.

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Section: Boundaries and Initial Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamics of surface charge and electric field distributions on basin‐type insulator in GIS/GIL due to voltage polarity reversal

et al. 2020

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“…Charge accumulation on dielectric surfaces may lead to a decreasing flashover voltage [7]. Such decrease is more pronounced for DC fields than AC fields [8]. However, different factors affect the flashover voltage under AC and DC conditions [9].…”

Section: Introductionmentioning

confidence: 99%

Automatic Optimization of Gas Insulated Components Based on the Streamer Inception Criterion

2021

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Gas insulated transmission lines (GILs) are used in electrical systems mainly for power transmission and High Voltage substation interconnection. In this paper, we focus on the development of complex numerical tools for the optimization of gas insulated HVDC components by the estimation of realistic electric field distribution and the voltage holding of the designed geometry. In particular, the paper aims at describing the correct modelling approach suitable to study high voltage components in DC, considering the nonlinear behaviour characterizing the electrical conductivity of solid and gas insulators. The simulated field distribution is then adopted to estimate the voltage holding of the dielectric gas, with a convenient engineering technique, based on the streamer criterion. These two tools are integrated in an automatic optimization package developed in COMSOL® and MATLAB®, with the purpose of adjusting the critical geometry features, suffering from excessive electrical stress and possibly giving rise to electrical breakdown, in order to guide the designer towards a robust solution.

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“…Complex service environments subject polymeric insulating materials to a variety of hazards concurrently. Apart from mechanical and thermal stresses, surface discharge could lead to insulation failure, incurring catastrophic consequences to various devices like spacecra, 1 pulsed power equipment, 2 power delivery equipment, 3,4 etc. Fig.…”

Section: Introductionmentioning

confidence: 99%

UV-cured nanocomposite coating for surface charging mitigation and breakdown strength enhancement: exploring the combination of surface topographical structure and perfluorooctyl chain

Wang

Jiang

et al. 2020

RSC Adv.

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The influence of surface charge accumulation on flashover voltage of GIS/GIL basin insulator under various voltage stresses

Cited by 57 publications

References 11 publications

Dynamics of surface charge and electric field distributions on basin‐type insulator in GIS/GIL due to voltage polarity reversal

Dynamics of surface charge and electric field distributions on basin‐type insulator in GIS/GIL due to voltage polarity reversal

Automatic Optimization of Gas Insulated Components Based on the Streamer Inception Criterion

UV-cured nanocomposite coating for surface charging mitigation and breakdown strength enhancement: exploring the combination of surface topographical structure and perfluorooctyl chain

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