Application of a new dynamic numerical model to predict polluted insulator flashover voltage

2014 ◽  
Author(s):  
M. Jabbari ◽  
C. Volat ◽  
I. Fofana
Keyword(s):  
Numerical Model ◽  
Flashover Voltage ◽  
Insulator Flashover

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

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2792
Author(s):  
Marouane Jabbari ◽  
Christophe Volat ◽  
Issouf Fofana
Keyword(s):  
Numerical Model ◽  
High Accuracy ◽  
Arc Length ◽  
Calculation Algorithm ◽  
Water Conductivity ◽  
Arc Model ◽  
Proposed Model ◽  
Flashover Voltage ◽  
Extra High Voltage ◽  
Future Work

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.

scholarly journals Experimental study on the effect of applying a crossed magnetic field on the insulator flashover behavior in high vacuum

2015 ◽  
Vol 05 (03) ◽  
pp. 1550026
Author(s):  
K. Abu-Elabass
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Transverse Magnetic Field ◽  
High Vacuum ◽  
Transverse Magnetic ◽  
Magnetic Flux Density ◽  
Surface Flashover ◽  
Vacuum Degree ◽  
Flashover Voltage ◽  
Insulator Flashover

In this study, a possible method of reducing the flashover stress is achieved by the effect of an additional magnetic field in the transverse direction on the main applied electric field. The degree of vacuum used in this study was [Formula: see text] Pa. The magnetic flux density B employed in this study extends from [Formula: see text] to [Formula: see text] T. From the results obtained throughout this work, the transverse magnetic field increases the flashover voltage and decreases the leakage current. The effect of the transverse magnetic field on the surface flashover of the dielectric solid in vacuum shows a marked dependence on the material and the thickness of the test specimen, the vacuum degree, the type of electric field (AC or DC) as well as the type of magnetic field (AC or DC).

scholarly journals Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Energies ◽  
2016 ◽  
Vol 9 (11) ◽  
pp. 954 ◽  
Author(s):  
Dongdong Zhang ◽  
Zhijin Zhang ◽  
Xingliang Jiang ◽  
Zhongyi Yang ◽  
Jiayao Zhao ◽  
...  
Keyword(s):  
Voltage Gradient ◽  
Flashover Voltage ◽  
Insulator Flashover ◽  
Gradient Correction

scholarly journals Surface Discharges and Flashover Modelling of Solid Insulators in Gases

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 591 ◽  
Author(s):  
Mohammed El Amine Slama ◽  
Abderrahmane Beroual ◽  
Abderrahmane (Manu) Haddad
Keyword(s):  
Atmospheric Pressure ◽  
Sulfur Hexafluoride ◽  
Experimental Measurements ◽  
Electrical Equivalent Circuit ◽  
Interface Impedance ◽  
Flashover Voltage ◽  
Surface Discharges ◽  
Insulator Flashover ◽  
Relationship Of ◽  
Air Medium

The aim of this paper is the presentation of an analytical model of insulator flashover and its application for air at atmospheric pressure and pressurized SF6 (Sulfur Hexafluoride). After a review of the main existing models in air and compressed gases, a relationship of flashover voltage based on an electrical equivalent circuit and the thermal properties of the discharge is developed. The model includes the discharge resistance, the insulator impedance and the gas interface impedance. The application of this model to a cylindrical resin-epoxy insulator in air medium and SF6 gas with different pressures gives results close to the experimental measurements.

Influential Factors of Suspension Insulator AC Pollution Flashover Voltage: A Survey

2014 ◽  
Vol 960-961 ◽  
pp. 726-729
Author(s):  
Qing Shen
Keyword(s):  
Influential Factors ◽  
Future Research ◽  
Test Results ◽  
Research Directions ◽  
Current Test ◽  
Suspension Insulator ◽  
Pollution Flashover ◽  
Flashover Voltage ◽  
Future Research Directions ◽  
Insulator Flashover

To make up insufficient of ESDD in insulator flashover voltage analysis, and A more comprehensive assessment of antifouling properties of insulators. This paper discusses the factors of suspension insulator flashover voltage of the AC, analyzed the influence of these factors on the flashover voltage, found the reason for large differences of the current test results of research institutions at home and abroad, and proposed future research directions.

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

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2807
Author(s):  
Marouane Jabbari ◽  
Christophe Volat ◽  
Issouf Fofana
Keyword(s):  
Finite Element ◽  
Numerical Calculation ◽  
Numerical Modelling ◽  
Leakage Current ◽  
Commercial Software ◽  
Analytical Formulation ◽  
Arc Model ◽  
Flashover Voltage ◽  
Insulator Flashover ◽  
Arc Propagation

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.

scholarly journals Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

2016 ◽  
Author(s):  
Dongdong Zhang ◽  
Zhijing Zhang ◽  
Xingliang Jiang ◽  
Zhongyi Yang ◽  
Jiayao Zhao ◽  
...  
Keyword(s):  
Laboratory Experiments ◽  
Correction Method ◽  
Voltage Gradient ◽  
Test Results ◽  
Outdoor Insulation ◽  
Flashover Voltage ◽  
Typical Type ◽  
Glass Insulator ◽  
Insulator Flashover ◽  
Gradient Correction

Natural polluted insulator surfaces are always coated with various kinds of soluble constituents, and those constituents affect flashover performance differentially. Currently this fact is not considered either in laboratory experiments or field pollution degree measurements, causing the existing insulation selection method to be deficient. In this paper a systematical research on insulator flashover voltage gradient correction involving types of soluble pollution constituents was presented. Taking typical type glass insulator as the sample, its flashover tests polluted by typical soluble chemicals NaCl, NaNO3, KNO3, NH4NO3, MgSO4, Ca(NO3)2 and CaSO4 were carried out. Then the flashover gradient correction was made combining the flashover performance of each soluble constituent, the ESDD contribution of the seven constituents, as well as the saturation performance of CaSO4. The correction was well verified with the flashover test results of insulator polluted by three types of soluble mixture. Research results indicate that the flashover gradient correction method proposed by this paper performs well in reducing the calculating error. It is recommended to carry out component measurements and flashover gradient correction to better select outdoor insulation configuration.

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