Influence of temperature on the characteristics of surface charge accumulation on PTFE model insulators

Pan, Cheng; Tiang, Ju; Wang, Dibo; Zhuo, Ran; Yang, Dong; Ye, Gao-Xiang; Fu, Mingli

doi:10.1109/tdei.2017.006070

Cited by 29 publications

(25 citation statements)

References 17 publications

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“…It was found that the lifting voltage or charge amount depends on barrier material, thickness, gas pressure, voltage type and so on. Three mechanisms may be responsible for the charges transferring to the particles: electric conduction through barrier bulk, electric conduction along barrier surface and PD, which are analogous to the mechanisms dominating surface charge accumulation at the interface between gas and solid dielectrics [83][84][85][86]. Besides, a series of electrostatic models about a conductive particle settling on an insulating plate have been solved, in which the plate is infinite, finite and the potential of particle is fixed or floating [87][88][89][90].…”

Section: Effect Of Dielectric Barriermentioning

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: Effect Of Dielectric Barriermentioning

confidence: 99%

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

et al. 2020

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“…Owing to the differences in casting methods, materials and formulations for insulators, the volume conductivity of insulators prepared by different manufacturers and laboratories varies greatly. In practice, the temperature distribution in the GIS/GIL chamber will change with the load [35]. According to (12), the change in temperature has a great influence on the volume conductivity, which may lead to a change in the surface charge distribution.…”

Section: Influence Of Insulator Volume Conductivitymentioning

confidence: 99%

Transition of the dominant charge accumulation mechanism at a Gas‐solid interface under DC voltage

Luo

Tang

Pan

et al. 2020

IET Generation, Transmission & Distribution

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“…Pan investigated the influence of temperature on the charge accumulation characteristics for a PTFE insulator sample with DC voltage. The results indicated that the accumulation of hetero-charges and homo-charges was enhanced with an increase in temperature [19]. However, in most experimental studies, the duration time of the applied DC voltage is relatively short.…”

Section: Introductionmentioning

confidence: 96%

“…In recent years, the characteristics of the charge accumulation for a DC insulator have been investigated by several scholars [15][16][17][18][19][20][21]. Kumara measured the surface charge distribution that emerged due to DC corona discharges and pre-stressing.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Surface Charge Accumulation and Capacitive‐Resistive Electric Field Transition for an HVDC GIL Insulator

Yang

Zhu

Tian

et al. 2020

IEEJ Transactions Elec Engng

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For a gas-solid insulation system with direct current (DC) voltage, the surface charge accumulation and decay phenomenon are directly related to the capacitive-resistive electric field transition process. The accumulated charges will affect the electrical insulation performance of a gas-solid insulation system, which is a challenge for the development of DC gas-insulated metalenclosed transmission line (GIL) equipment. In this paper, a study of the surface charge accumulation characteristics for a DC GIL insulator in the electric field transition process is presented. The charge accumulation model for the gas-solid insulation system was established with consideration of the bulk charge conductivity in the solid dielectrics, the ion conductivity in the weakly ionized gas, and the charge conductivity at the interface. A surface potential measurement system was then built. The charge accumulation model was verified by measurements of the surface potential on a cylindrical insulator sample, and the charge accumulation characteristics on the surface of the GIL insulator were investigated. The simulation results indicate that the accumulated homopolar charges led to the decrease of the electric field strength near the conductor by 9.4% and the increase of the electric field strength near the GIL shell by 23.5%. The concave surface of the insulator mostly accumulated heteropolar charges, which led to an increase in the electric field intensity by 5.5%. The transition of the charge accumulation mechanism with the variation of the bulk conductivity was also analyzed. The convex surface of the insulator accumulated homopolar charges, and the concave surface mostly accumulated heteropolar charges when the bulk conductivity was between 10 −14 and 10 −17 S/m. However, with the further reduction of the bulk conductivity, the mechanism of the charge accumulation gradually became dominated by ion conductivity in the SF 6 gas.

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Influence of temperature on the characteristics of surface charge accumulation on PTFE model insulators

Cited by 29 publications

References 17 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

Transition of the dominant charge accumulation mechanism at a Gas‐solid interface under DC voltage

Characteristics of the Surface Charge Accumulation and Capacitive‐Resistive Electric Field Transition for an HVDC GIL Insulator

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