Numerical simulation on the surface charge accumulation process of epoxy insulator under needle‐plane corona discharge in air

Liang, Hucheng; Du, B. X.; Li, Jin; Du, Qiang

doi:10.1049/iet-smt.2017.0164

Cited by 22 publications

(17 citation statements)

References 17 publications

(22 reference statements)

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“…The reaction involved in the air corona discharge process can be approximately regarded as reaction of oxygen and nitrogen with their derivative ions. As can be seen from Table I, even so simplified, the number of equations involving the micro reaction of oxygen and nitrogen with their derivative ions is still as high as 39 [21][22][23]. The more the number of reaction equations, the more unfavorable it is to…”

Section: A Ionic Reaction In Air Corona Dischargementioning

confidence: 99%

“…The electron transport equation in air corona discharge process under normal pressure is described based on electrodynamics collision theory of micro-level Maxwell, probability distribution in consideration of electron migration and diffusion in electric field from macro-level. Its constitutive equation is expressed as formula (9) [21]. Where ne, μe, E, and De, are the spatial electronic number density, electron mobility, electric-field vector and electron diffusion coefficient, respectively.…”

Section: Electron Transport Equationmentioning

confidence: 99%

“…The electron energy field is similar to the electron concentration and follows the principles of diffusion, convection and electric field migration. The transport equation can be expressed as formula (12) [21].…”

Section: Transport Equation Of Electron Energymentioning

confidence: 99%

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FEM Simulation of Charge Accumulation Behaviours on Polyimide Surface in 10 kV Negative High-Voltage Corona Polarization Process

Tao

Wang

2020

IEEE Access

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The study investigates behaviors of charge accumulation on an insulated surface from micro perspective via the numerical method. A coupling bridge between the micro-ion reaction system and the macroscopic multi-physical field was constructed by means of the electronic energy distribution function, which revealed the coupling mechanism in the process of corona charge. Moreover, it revealed the transport and accumulation mechanism of charge on the surface of insulating materials. 2D axisymmetric finite element model was built based on the multi-physical field coupling theory. 10 kV negative voltage was applied using a pin-plate electrode structure and polyimide film was taken as insulated surface to simulate the dynamic charge accumulation behaviors in the corona discharge process. The generation, migration and distribution laws of charged ions and electrons in different stages of corona discharge process were given. Charge distribution laws in different stages of charge process of polyimide were given and discussed. When corona discharge reached quasi-stationary state, the total charge number accumulated on the surface was at 10-10 Coulomb order of magnitude, and the drift current was at 10-7 ampere order of magnitude. An experimental platform was set up to test drift current and charge distribution under quasi-stable discharge state. The results show that the simulation results and the experimental data under quasi-stable state are consistent, thus indirectly verifying the correctness of the proposed numerical simulation algorithm and its simulation results.

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Section: A Ionic Reaction In Air Corona Dischargementioning

confidence: 99%

Section: Electron Transport Equationmentioning

confidence: 99%

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FEM Simulation of Charge Accumulation Behaviours on Polyimide Surface in 10 kV Negative High-Voltage Corona Polarization Process

Tao

Wang

2020

IEEE Access

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“…However, corona discharge could occur even with welldesigned HVDC transmission equipment, and the generated free charges are accumulated on the surface of polymer insulating material under the field stress [2]. The surface charge on the gas-solid interface not only results in the electric field distortion but also acts as seed charge for the development of surface discharge, by which the flashover voltage is reduced in HVDC insulation system, the safe operation of the equipment is threatened, and even the stable operation of the power system is impacted [3][4][5]. Therefore, from the viewpoint of safety, it is of great importance to understand the mechanism of surface charge accumulation under the corona discharge in air.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Transient Surface Charging of Polymer Surface under DC Corona Considering Plasma Chemistry

Gao

Zheng

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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In this paper, the transient process of negative DC corona generated with needle to plane electrode covered by polymer film is investigated by numerical simulation considering air plasma chemistry. The variation in plasma species in corona discharge and the transient process of charge accumulation on the film are examined. Moreover, the electric field and the mean electron energy distribution on the sample surface are discussed. Obtained results indicate that during the corona process, O 2 + , O 4 + and N 4 + are the dominant positive ions, O 2 and O are the main negative ion and the neutral particle, respectively. The charge accumulation region expands along the radial direction and the charge density increases gradually. In addition, the discharge channel shape is changed from column to cone with time, which is attributed to the electric field modification achieved by the accumulated charges. In 2000 ns, the mean electron energy distribution on the polymer surface varies between 2.1 and 5.8 eV and finally stabilizes to 3.7 eV, thus the electrons can overcome the barrier at gas-solid interface and become injected into the polymer bulk. It is suggested that the polymer surface charging transient is highly associated with the plasma behavior.

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“…In order to improve the reliability of GIS/GIL, researches aiming on the surface charge measurement and simulation have been conducted worldwide [6][7][8]. Some researchers built a scaled-down GIS/GIL and measured the surface charge distribution on the spacers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

Du¹,

Jin²,

Liang³

2019

Electric Power Conversion

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Many researchers have proposed a variety of mathematical models to simulate the surface charge accumulation process of DC-GIS/GIL spacers. However, few of them took the gas collision ionization and charge trapping-detrapping process into consideration. This chapter combined the plasma hydrodynamics and charge transport equations and built a modified model. Some conclusions are shown as follows: for the basin-type spacer, the surface charge has the same polarity as the applied voltage on the lower surface but the opposite polarity on the upper surface. For the disc-type spacer, the surface charge has the same polarity as the applied voltage near the shell but the opposite polarity near the conductor under negative voltage. But under positive voltage, negative charge exists almost on the whole surface. The most serious distortion of the electric field occurs at the triple junction of epoxy spacer. Under load condition, there is an obvious temperature rise on the conductor due to joule heating, which has a great influence on the electric field distribution. The application of shielding electrodes has the function of field grading at the triple junction, which can be referred in the DC GIS/GIL design.

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Numerical simulation on the surface charge accumulation process of epoxy insulator under needle‐plane corona discharge in air

Cited by 22 publications

References 17 publications

FEM Simulation of Charge Accumulation Behaviours on Polyimide Surface in 10 kV Negative High-Voltage Corona Polarization Process

FEM Simulation of Charge Accumulation Behaviours on Polyimide Surface in 10 kV Negative High-Voltage Corona Polarization Process

Numerical Simulation of Transient Surface Charging of Polymer Surface under DC Corona Considering Plasma Chemistry

Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

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