Study of a Nonequilibrium Plasma Model of Surface Discharge and the Influencing Factors

Sima, Wenxia; Liu, Chunxiang; Yang, Ming; Xu, Hang; Shao, Qianqiu

doi:10.1109/tps.2017.2690901

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…We can deduce the amount of surface charge remaining after flashover is not sensitive to the dielectric permittivity. This is consistent with the discharge simulations reported in [15], in which the amount of surface charge was similar for different dielectric materials. On the other hand, the rate at which surface charge builds up before flashover could be sensitive to the permittivity.…”

Section: Effect Of Permittivitysupporting

confidence: 92%

“…However, we expect that this approximation, which was also used in e.g. [1,22,15], has no strong effect for the transient (non-equilibrium) simulations presented here. The minimum grid spacing Δx used for the adaptive mesh is about 1.2 μm.…”

Section: Plasma Modelmentioning

confidence: 94%

“…They validated the model parameters by comparing with experimental data. Sima et al [15] used a 2D axisymmetric fluid model to identify different surface discharge stages from the electric current, in a geometry consisting of two plate electrodes and a cylindrical insulator. The resulting surface charge and the effects of the voltage amplitude and the dielectric properties were also investigated.…”

Section: Introductionmentioning

confidence: 99%

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A computational study of negative surface discharges: Characteristics of surface streamers and surface charges

Li¹,

Sun²,

Teunissen³

2020

IEEE Trans. Dielect. Electr. Insul.

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We investigate the dynamics of negative surface discharges in air through numerical simulations with a 2D fluid model. A geometry consisting of a flat dielectric embedded between parallel-plate electrodes is used. Compared to negative streamers in bulk gas, negative surface streamers are observed to have a higher electron density, a higher electric field and higher propagation velocity. On the other hand, their maximum electric field and velocity are lower than for positive surface streamers. In our simulations, negative surface streamers are slower for larger relative permittivity. Negative charge accumulates on a dielectric surface when a negative streamer propagates along it, which can lead to a high electric field inside the dielectric. If we initially put negative surface charge on the dielectric, the growth of negative surface discharges is delayed or inhibited. Positive surface charge has the opposite effect.

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Section: Effect Of Permittivitysupporting

confidence: 92%

Section: Plasma Modelmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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A computational study of negative surface discharges: Characteristics of surface streamers and surface charges

Li¹,

Sun²,

Teunissen³

2020

IEEE Trans. Dielect. Electr. Insul.

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“…This allows us to investigate the whole streamer-dielectric interaction, including discharge inception, attachment to the dielectric and propagation over the surface. Moreover, this geometry resembles some actual HV insulation applications [9,25], e.g., insulators inserted between HV and ground electrodes in gas-insulated switchgear. Our focus here is on positive surface streamers, which can be computationally expensive to simulate.…”

Section: Introductionmentioning

confidence: 94%

A computational study of positive streamers interacting with dielectrics

Sun

Zhang

et al. 2020

Plasma Sources Sci. Technol.

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We use numerical simulations to study the dynamics of surface discharges, which are common in high-voltage engineering. We simulate positive streamer discharges that propagate towards a dielectric surface, attach to it, and then propagate over the surface. The simulations are performed in air with a two-dimensional plasma uid model, in which a at dielectric is placed between two plate electrodes. Electrostatic attraction is the main mechanism that causes streamers to grow towards the dielectric. Due to the net charge in the streamer head, the dielectric gets polarized, and the electric eld between the streamer and the dielectric is increased. Compared to streamers in bulk gas, surface streamers have a smaller radius, a higher electric eld, a higher electron density, and higher propagation velocity. A higher applied voltage leads to faster inception and faster propagation of the surface discharge. A higher dielectric permittivity leads to more rapid attachment of the streamer to the surface and a thinner surface streamer. Secondary emission coef cients are shown to play a modest role, which is due to relatively strong photoionization in air. In the simulations, a high electric eld is present between the positive streamers and the dielectric surface. We show that the magnitude and decay of this eld are affected by the positive ion mobility.

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“…A large number of studies have shown that the main factors affecting the discharge along the surface include: gas composition and pressure, geometry of the insulation material, surface treatment of the insulation material, etc. [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study on the Discharge Characteristics along the Surface and Charge Movement Characteristics of Insulating Media in an Airflow Environment

Zhang

Wang

et al. 2022

Energies

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The gas–solid interface of high-voltage insulating equipment is a weaker part of insulating equipment insulation, and preventing the occurrence of discharge along the surface of insulating equipment is a critical problem for high-voltage insulation. This article investigates the discharge characteristics and charge movement characteristics of insulating media under an airflow environment. The surface discharge characteristics of the insulating medium in the airflow environment were obtained by using a high-velocity airflow test platform, and the surface discharge voltage characteristics, discharge path characteristics, and force conditions of the discharge process were analyzed. The surface charge motion characteristics of the insulating medium in the high-velocity airflow environment were also tested, and the distribution characteristics, dissipation characteristics and conduction mechanism of the surface charge of the insulating medium in the high-velocity airflow environment were revealed. The research results showed that: the discharge voltage along the insulating medium surface gradually increases with the increasing velocity of airflow; the discharge path along the surface of the insulating medium gradually shifts backward under the action of airflow; under the action of airflow, the charge on the insulating medium surface is blown away, thus reducing the charge concentration on the insulating medium surface; the trap level center of the insulating medium gradually decreases under the action of airflow, which provides the conditions for the charge blowing effect on the insulating medium surface. This investigation supplies the theory support for the protection of insulation equipment in an airflow environment and technical guidance for the insulation design of insulating equipment in an airflow environment to ensure the secure and steady running of insulating equipment in high-speed trains and high-voltage transmission lines.

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Study of a Nonequilibrium Plasma Model of Surface Discharge and the Influencing Factors

Cited by 5 publications

References 32 publications

A computational study of negative surface discharges: Characteristics of surface streamers and surface charges

A computational study of negative surface discharges: Characteristics of surface streamers and surface charges

A computational study of positive streamers interacting with dielectrics

Study on the Discharge Characteristics along the Surface and Charge Movement Characteristics of Insulating Media in an Airflow Environment

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