Refinement of residual resistance calculation dedicated to polluted insulator flashover models

Bessedik, Sid Ahmed; Hadi, H.; Volat, Christophe; Jabbari, Marouane

doi:10.1109/tdei.2014.6832267

Cited by 11 publications

(23 citation statements)

References 22 publications

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“…In this way, the influence of these criteria on the FOV results can be studied as well as the interaction between each of them. Moreover, in order to propose a generic model, the proposed algorithm can be applied to all type of insulator geometries thanks to the implementation of the 2D open model block based on the open model method proposed by Rumeli for polluted insulators [37,38]. The open model was initially used to develop the surface geometry of a real uniform polluted insulator into an equivalent surface in 2D.…”

Section: Subsection Presentation Of the Calculation Algorithmmentioning

confidence: 99%

Numerical Modelling of Ice-Covered Insulator Flashover: The Influence of Arc Velocity and Arc Propagation Criteria

2018

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This paper investigates the influence of arc velocity and propagation criteria on the parameters of a dynamic numerical mono-arc model used to predict flashover voltage of ice-covered insulators. For that purpose, a generic algorithm has been developed which, coupled with a Finite Element commercial software, permits us to solve the mono-arc Obenaus equation. The versatility of the proposed algorithm allows to implement three different arc propagation criteria and five different arc velocity criteria, as well as to compute the corresponding flashover voltage, arc velocity and leakage current. Moreover, this algorithm permits to propose a new arc velocity criterion based on numerical calculation instead of analytical formulation as proposed in literature.

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Section: Subsection Presentation Of the Calculation Algorithmmentioning

confidence: 99%

Numerical Modelling of Ice-Covered Insulator Flashover: The Influence of Arc Velocity and Arc Propagation Criteria

2018

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“…However, the calculation of the pollution resistance of this open model requires that the density current distribution is uniform. In this context, the presence of the arc root at the surface of the conductive layer cannot be taken into account, resulting in a significant discrepancy in the calculation of R(x), as demonstrated in a previous study [27]. On the other hand, Wilkins proposed a new formulation, which takes into account the effect of the density current line constriction at the arc root position.…”

Section: Introductionmentioning

confidence: 98%

“…For mathematical flashover models, two approaches have been principally used: the open or AR model proposed by Rumeli and the mathematical formulation proposed by Wilkins. Rumeli proposed that the surface geometry of a real insulator is equivalent to a surface in 2D, called the AR or open model, whose length is equal to the leakage path of the given real insulator, as explained in detail in [27]. The advantage of this model is to provide a simple representation of the complex geometry of the uniformly polluted layer covering the insulator.…”

Section: Introductionmentioning

confidence: 99%

“…In this way, using the theory of conjugate functions, the calculation of the polluted surface resistance is reduced to a two-dimensional (2D) Laplacian field problem. Taking into account the presence of the arc root influences the residual resistance R(x) value as demonstrated in [27]. However, the problem with the Wilkins formulation is that it can only be applied to rectangular pollution layer geometries and is not representative of real polluted insulator shapes.…”

Section: Introductionmentioning

confidence: 99%

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Development of a New Bi-Arc Dynamic Numerical Model for Modeling AC Flashover Processes of EHV Ice-Covered Insulators

Jabbari¹,

Volat²,

Fofana³

2018

Energies

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This paper presents the development of a new bi-arc dynamic numerical model for predicting AC critical flashover voltage (FOV) of ice-covered extra-high voltage (EHV)insulators. The proposed model is based on a generic calculation algorithm coupled with commercial finite element method software designed to solve the Obenaus/Rizk model. The proposed model allows one to implement the Nottingham and Mayr approaches and compare the results obtained as a function of the arcing distance, the freezing water conductivity, and the initial arc length. The validation of the model demonstrated high accuracy in predicting the FOV of ice-covered post-type insulators and its capability to simulate the interaction of the two partial arcs during the flashover process. In particular, the results showed that the Nottingham approach is sensibly more accurate than the Mayr one, especially in simulating the dynamic behavior of the partial arcs during the flashover process. Based on the encouraging results obtained, a multi-arc calculation algorithm was proposed using the bi-arc dynamic numerical model as a basis. The basic idea, which consists in dividing the multi-arc model in several bi-arc modules, was not implemented and validated but will serve as a promising concept for future work.Energies 2018, 11, 2792 2 of 22 applicability of the static and dynamic predictive models to insulators having an arcing distance lower than 1 m [12][13][14][15][16][17][18].To avoid such a limitation, some authors have proposed an improvement of the original Wilkins formulation in order to determine the residual resistance when several partial arcs and, consequently, several arc roots are in contact with the ice surface [14,18]. This improved formulation has been implemented in a mathematical static multi-arc model and successfully applied to full-scale extra-high voltage (EHV) post insulators [14]. More recently, this new formulation has been implemented in a dynamic mathematical multi-arc model using the same approach and is described in more detail in the next section [18]. Both multi-arc models can predict the critical flashover voltage, but the dynamic model can also predict leakage current and arc velocity during the flashover process. However, the use of Wilkins formulation requires a well-defined uniform ice layer that can only be obtained under severe icing conditions [14]. Under these specific conditions, the insulator is totally bridged by the ice deposit that can then be modelled as a half cylinder [12][13][14][15][16][17][18]. Consequently, the calculation of the residual resistance using the analytical formulation remains the main limitation of the current static and dynamic mathematical models used to predict the FOV of ice-covered insulators. However, such residual resistance formulation is more difficult to use in the case of non-uniform conductive layers with complex geometries.To deal with such geometry-related problems, new numerical predictive models using E-field calculation tools have been proposed in recent years by the author...

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“…In the aspect of flashover model which this paper focuses on, much research has been conducted [9][10][11][12][13]. In literature [9], the insulator was partitioned into triangular elements and the finite element method was adopted to determine potential distribution, pollution layer resistance, and flashover voltage.…”

Section: Introductionmentioning

confidence: 99%

DC Flashover Dynamic Model of Post Insulator under Non-Uniform Pollution between Windward and Leeward Sides

et al. 2019

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Experience shows that under unidirectional wind or certain terrain, the surface of post insulators is non-uniformly polluted between windward and leeward sides, which affects the flashover characteristics. In this paper, a formulation of residual pollution layer resistance was proposed under this non-uniformity and a typical post insulator was taken as an example to analyze and calculate its residual resistance. The theoretical resistance was verified by numerical simulations using COMSOL Multiphysics. The proposed resistance formulation was then implemented in a DC flashover dynamic model to determine the flashover voltage (Ucal), which was validated by artificial flashover tests. Then the factors affecting DC flashover voltage were analyzed. Research results indicate that: the residual resistance formulation agrees well with simulation results, especially when the arc length exceeds 70% of the leakage distance. The good concordance between theoretical and experimental flashover voltages with most relative error within ±10%, validates the flashover model and its residual resistance formulation. Ucal gets impaired under this non-uniformity. The degree of reduction is related to salt deposit density ratio (m) of windward to leeward side and leeward side area proportion (k).

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Refinement of residual resistance calculation dedicated to polluted insulator flashover models

Cited by 11 publications

References 22 publications

Numerical Modelling of Ice-Covered Insulator Flashover: The Influence of Arc Velocity and Arc Propagation Criteria

Numerical Modelling of Ice-Covered Insulator Flashover: The Influence of Arc Velocity and Arc Propagation Criteria

Development of a New Bi-Arc Dynamic Numerical Model for Modeling AC Flashover Processes of EHV Ice-Covered Insulators

DC Flashover Dynamic Model of Post Insulator under Non-Uniform Pollution between Windward and Leeward Sides

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