Metal particle movement and distribution characteristics under AC voltage and ball‐plane electrodes

Sun, Jun-Zhao; Sun, Lei; Chen, Weijiang; Li, Zhibing; Yan, Xin; Xu, Yunjian

doi:10.1049/hve.2018.5018

Cited by 31 publications

(17 citation statements)

References 18 publications

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“…The movement of a particle is determined by various forces acting on it. In terms of the above analysis, it is inferred that the migration relates to applied field [41][42][43], particle's parameters [44][45][46][47], fluid characteristics [26,48,49] and so on. Here, some important factors contributing to the moving trajectory are highlighted.…”

Section: Movement Characteristics and Influential Factorsmentioning

confidence: 99%

Review about PD and breakdown induced by conductive particles in an insulating liquid

et al. 2020

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In insulating liquid, a conductive particle becomes charged through the interaction with a conductor exposed to an applied field. Then, it migrates in the action of both electric field and fluid and causes the enhancement of local field when it is in proximity of the conductor with opposite polarity. The enhancement will lead to partial discharge (PD) and may even ignite full gap breakdown in special cases. This study reviews comprehensive researches relevant to these topics. In the first place, several theoretical methods about how to obtain the charges held by a conductive particle with known potential are introduced, so are experimental methods. Then, forces acting on the charged particle in liquid are classified, and its migration characteristics, as well as influential factors, are described. Subsequently, PD and breakdown mechanisms of liquid initiated by conductive particles are presented. The latter involves two cases: electric-field enhancement when the particle concentration is low and bridging phenomenon when it is high. At last, two important, but frequently ignored factors, i.e. dielectric barrier and oil flow, are highlighted, and the authors' suggestions for future work are put forward.

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Section: Movement Characteristics and Influential Factorsmentioning

confidence: 99%

Review about PD and breakdown induced by conductive particles in an insulating liquid

et al. 2020

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“…The technology of gaseous insulated switchgears and pipelines (GIS/GIL) invented in the 1960s has been proven feasible since the installation of the first high voltage GIS in 1968 and the first 420 kV GIL in 1974 [1]. GIS and GIL are indispensable for power generation, transmission and distribution, based on their various advantages compared with the traditional methods [2].…”

Section: Introductionmentioning

confidence: 99%

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

Liang

Chen

2020

High Voltage

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The electric field distributions along gas-solid interfaces determine the reliability, lifetimes and sizes of gaseous insulated switchgears/pipelines (GIS/GIL), which also affect the reliability of power systems. In this study, the characteristics of steady and transient electric field distributions were first introduced, followed by the concept of functionally graded materials (FGMs). The development histories of FGM applied in electrical engineering and the related optimisation methods were described in detail. The field regulation effect and fabrication technology of different FGM insulators were also compared. To overcome the limitations of traditional FGM insulators, the design of surface FGM (SFGM) was proposed, together with their preparation methods and electrical performance. Furthermore, the future development prospects of FGM and SFGM insulators for compact GIS/GIL were summarised.

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“…A simulation using COMSOL software is also performed to analyse the charge movement and accumulation mechanism near the needle electrode. surface under AC voltage [22,23]. The electrodes are made of aluminium and a disc-shaped insulator specimen made of epoxy resin are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Wang

et al. 2020

High Voltage

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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 crosssection of C 4 F 7 N gas in a wide range of electron energy distribution.

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Metal particle movement and distribution characteristics under AC voltage and ball‐plane electrodes

Cited by 31 publications

References 18 publications

Review about PD and breakdown induced by conductive particles in an insulating liquid

Review about PD and breakdown induced by conductive particles in an insulating liquid

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

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

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Metal particle movement and distribution characteristics under AC voltage and ball‐plane electrodes

Cited by 31 publications

References 18 publications

Review about PD and breakdown induced by conductive particles in an insulating liquid

Review about PD and breakdown induced by conductive particles in an insulating liquid

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

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

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Product

Resources

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