The Effect of a Vertical Electric Field on the Surface Flashover Characteristics of a Bushing Model

Zhu, Mingxi; Wang, Liming; Yin, Fanghui; Farzaneh, M.; Mei, Hongwei; Wen, Lu

doi:10.3390/en11061607

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The progression of the arc propelled by the electric field along the surface. Prior investigations conducted within our research group [25,26] have effectively elucidated the mechanism through which electric fields propel the development of arcs along the surface. A succinct summary of this mechanism is provided below, serving to enhance the reader's comprehension of the subsequent model detailing the transition from pollution arc to sliding arc.…”

Section: Discussionmentioning

confidence: 99%

Effect of vertical electric field components on the local arc development along contaminated surfaces

Wen,

Cao,

Wang

2024

Phys. Scr.

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During operation, a vertical-component electric field emerges on the surface of high-voltage AC bushings. This unique electric field structure renders the bushing more susceptible to discharge and flashover. However, limited attention has been paid to studying the flashover characteristics resulting from surface pollution in such electric fields. This investigation, involving four differently structured bushings as well as post insulators, delves into the impact of pollution, creepage distance, and electric field structure on bushing flashover characteristics. The study reveals that increasing the creepage length of heavily polluted bushings does not significantly enhance their flashover voltage. Moreover, the role of the vertical electric field in the local arc development was analysed. This research could provide valuable references for future bushing design in polluted areas.

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Section: Discussionmentioning

confidence: 99%

Effect of vertical electric field components on the local arc development along contaminated surfaces

Wen,

Cao,

Wang

2024

Phys. Scr.

Self Cite

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“…Krile et al revealed a material dependence on the discharge path of the surface flashover along dielectric insulators in SF6 environment [16]. The electric field also has an important influence on the surface flashover of dielectric insulators [17], [18].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Experimental Verification of the Peaking Capacitor’s Flashover Process in an EMP Simulator

et al. 2022

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The flashover process of the peaking capacitor in the electromagnetic pulse (EMP) simulator is studied based on theoretical analyses and experimental verification in this paper. There are deeper and denser ablation spots on the film surface near the inner core of the destroyed peaking capacitor, while the damage of the outer film is relatively slight, which indicates that the flashover current along the inner film is larger. Besides, the circuit simulation analyses show that the earlier the flashover occurs on the film of the peaking capacitor, the smaller the flashover current. The electric field on the non-conical surface of the capacitor is mainly occupied with normal component. Differently, for the conical surface, the electric field on the outer layer is dominated by the normal component and the parallel component is the main part on the inner layer. It is considered that the flashover on the conical surface originates from outer layers and develops gradually to the inner until the flashover penetrates through all layers. Furthermore, the images of flashover show that the flashover firstly occurs on the outermost layers and develops to the inner layers with the increase of the voltage. For such special structure of the peaking capacitor, the parallel component of electric field is more likely to facilitate the flashover under nanosecond pulse. These results may exhibit specific reference implication in the design of insulation for the peaking capacitor used in EMP simulator.

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“…In recent years, Yimin, Baoji, Fengjing etc. HVDC converter stations in China have repeatedly experienced internal breakdown failures on resin impregnated paper (RIP) valve side bushing caused by current heating, resulting in single-pole lockout at the HVDC converter stations, which has large negative impact on the AC-DC transmission system [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Disposal of Typical Breakdown Failure for Resin Impregnated Paper Bushing in the Valve Side of HVDC Converter Transformer

Tang

Chen

et al. 2019

Energies

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This paper presents analysis, diagnosis and disposal with a typical internal breakdown failure of the resin impregnated paper (RIP) valve side bushing in high voltage direct current (HVDC) converter transformer. Based on the analysis of fault current characteristics at the time of the RIP valve side bushing failure, and field test results of insulation parameters, a method of diagnosing typical breakdown failures of valve side bushings is proposed. Through disassembly inspection of the internal overheating and arcing traces on the failure bushing, the root cause of this typical breakdown failure is found, which is upper axial flashover along the RIP condenser/SF6 interface caused by the abnormal contact of two current-carrying conductive tubes. Temperature distribution inside the bushing with an abnormal contact resistance between the copper conductive tube and aluminum conductive tube under different load current is simulated by using the finite element method. An special device is also developed for repairing defective bushing on-site, and 75 bushings with conductive contact defects have been repaired on the premise of not pushing converter transformers away from the valve hall and even without pulling out defective bushings.

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The Effect of a Vertical Electric Field on the Surface Flashover Characteristics of a Bushing Model

Cited by 7 publications

References 21 publications

Effect of vertical electric field components on the local arc development along contaminated surfaces

Effect of vertical electric field components on the local arc development along contaminated surfaces

Analysis and Experimental Verification of the Peaking Capacitor’s Flashover Process in an EMP Simulator

Analysis and Disposal of Typical Breakdown Failure for Resin Impregnated Paper Bushing in the Valve Side of HVDC Converter Transformer

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