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 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.

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 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 Pollution Flashover Characteristics of Composite Crossarm Insulator with a Large Diameter

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6491
Author(s):  
Jing Nan ◽  
Hua Li ◽  
Xiaodong Wan ◽  
Feng Huo ◽  
Fuchang Lin
Keyword(s):  
Silicone Rubber ◽  
Large Diameter ◽  
Surface Hydrophobicity ◽  
Voltage Gradient ◽  
Hydrophilic Surface ◽  
Core Diameter ◽  
Design And Optimization ◽  
The Core ◽  
Pollution Flashover ◽  
Flashover Voltage

The composite crossarm insulator differs greatly from the suspension insulator in structure and arrangement. This study aims to determine the pollution flashover characteristics of composite crossarm insulators under different voltage grades. Four types of AC composite crossarm insulators with diameters ranging from 100 mm to 450 mm are subjected to artificial pollution test, and then the effects of the surface hydrophobicity state of silicone rubber, core diameter, umbrella structure, arrangement, and insulation distance on the pollution flashover voltage of the composite crossarm insulators are analyzed. Under the pollution grade 0.2/1.0 mg/cm2 and voltage grade from 66 kV to 1000 kV, if the silicone rubber surface changes from HC5 to HC6, the pollution flashover voltage of the composite crossarm insulator will increase by 13.5% to 21.0% compared with the hydrophilic surface. If the core diameter changes from 100 mm to 300 mm, the pollution flashover voltage gradient decreases with the increase in core diameter; if the core diameter changes from 300 mm to 450 mm, the pollution flashover voltage gradient increases with core diameter. Under the same insulation height and core diameter, the umbrella structure will have a certain impact on pollution flashover voltage by up to 1.7% to 5.4%. Under the horizontal arrangement, the pollution flashover voltage can increase by 10.5% to 12.1% compared with that under the vertical arrangement. Under the hydrophilic surface and weak hydrophobicity state, the pollution flashover voltage has a linear relationship with the insulation distance. The above results can provide a reference for the structural design and optimization of the composite crossarm insulator.

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