New mathematical formulations for calculating residual resistance in a static arc model of ice-covered insulators

Porkar, Babak; Farzaneh, M.

doi:10.1016/j.coldregions.2015.05.007

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…At this time, the local arc is always first generated in the air gap at the high-voltage end, which is consistent with the observation of ice-covered insulators flashover test [13,19,20]. Moreover, when the local arc appears, the water film conductivity will further affect the residual ice resistance, and consequently, impact the flashover performance of ice-covered insulators [21].…”

Section: Effect Of Water Film Conductivity On Electric Field Of Icecosupporting

confidence: 83%

Three‐dimensional electric field simulation and flashover path analysis of ice‐covered suspension insulators

et al. 2020

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Flashover of ice-covered insulators seriously affects the safe operation of transmission lines. It is necessary to study the electric field distribution for flashover analysis of ice-covered insulators. The electric field of ice-covered insulators was mostly calculated by a two-dimensional (2D) axisymmetric model that cannot be well corresponded to actual icing situations. In this study, a 3D electric field simulation model of ice-covered suspension insulators under moderate icing condition with applied DC voltage was established. Two characteristic parameters, E av and E max were proposed to measure electric field distortion degree. Based on the simulation results, the effects of water film conductivity, icicle length, icicle deviation angle, and icicle distribution on E av and E max were studied. The results showed that icicles have a significant influence on the electric field distribution of insulators. E av increases with the increase of icicle length and decreases with the increase of icicle deviation angle. E max increases with the increase of the icicle length, icicle spacing and adjacent icicle length difference. When the icicle deviation angle is 45°, E max is the largest. Lastly, the possible flashover paths were analysed based on the simulation results, which would provide a theoretical basis for building a flashover model of ice-covered insulators.

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Section: Effect Of Water Film Conductivity On Electric Field Of Icecosupporting

confidence: 83%

Three‐dimensional electric field simulation and flashover path analysis of ice‐covered suspension insulators

et al. 2020

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“…Regarding the analytical formulation, let us consider that the high-voltage needle may be assumed to a circular conductor having a radius r p and a charge + Q, placed above the ground (without a barrier) at a distance H. The electric field is calculated thanks to the method of image charges (Fig. 5a) which states that the ground plane conductor could be removed and replaced by an image of the high-voltage circular conductor having an opposite electric charge (−Q) and similar radius (r p ) [76]. According to the Gauss theorem, both electrostatic field E T and potential V T of the two conductors may be obtained and expressed in (12) and (13), respectively…”

Section: Electric Field Computationmentioning

confidence: 99%

Creeping discharges features propagating in air at atmospheric pressure on various materials under positive lightning impulse voltage – part 2: modelling and computation of discharges’ parameters

Douar

Béroual

Souche³

2017

IET Generation, Transmission & Distribution

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“…The improved arc model had a better correspondence with the test results than the previous model. It could be used as a powerful tool for reducing icing flashover accident of insulator strings 19 . For optimizing the method of insulator flashover, Taheri et al established an empirical model by the electrical conductivity of the melted ice accumulation to determine the flashover voltage under icing conditions and investigated the influence of air gaps on the flashover stress of iced post insulator 20 .…”

Section: Introductionmentioning

confidence: 99%

Feature extraction and classification of surface discharges on an ice-covered insulator string during AC flashover using gray-level co-occurrence matrix

Liu

et al. 2021

Sci Rep

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This study focuses on the feature extraction and classification of surface discharges of ice-covered insulator strings during process of alternating current flashover. The test specimen was the five units suspension ceramic insulators, which was artificially accreted with wet-grown ice in the cold-climate room of CIGELE. Based on the IEEE Standard 1783/2009, flashover experiments were conducted on iced insulators to measure the minimum flashover voltage (VMF) and record the propagating process of surface discharges to flashover by using a high-speed video camera. The gray-level co-occurrence matrix (GLCM) method has been used to extract four parameters of arc discharge images features that characterize different stages of flashover process. The parameters are angular second moment (ASM), contrast (CON), inverse difference moment (IDM) and entropy (ENT). These statistical parameters of GLCM can be extracted to reveal the underlying properties of ice flashover on the insulator surface from the quantitative perspective. The different values of these indicators are representative of the different stages in the process of arc discharge. Once the value of quantitative indicators (ASM, CON, IDM, ENT) of surface discharges exceeds the threshold value, the higher flashover risk of iced insulators will appear. Hence, the proposed methods are helpful to understand and monitor surface discharge on iced outdoor insulator strings for preventing flashover accidents.

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New mathematical formulations for calculating residual resistance in a static arc model of ice-covered insulators

Cited by 7 publications

References 32 publications

Three‐dimensional electric field simulation and flashover path analysis of ice‐covered suspension insulators

Three‐dimensional electric field simulation and flashover path analysis of ice‐covered suspension insulators

Creeping discharges features propagating in air at atmospheric pressure on various materials under positive lightning impulse voltage – part 2: modelling and computation of discharges’ parameters

Feature extraction and classification of surface discharges on an ice-covered insulator string during AC flashover using gray-level co-occurrence matrix

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