Effect of environment factors on ac flashover performance of 3 units of polluted insulator strings under natural fog condition

Dong, Bingbing; Jiang, Xingliang; Zhang, Zhijin; Hu, Jianlin; Hu, Qin; Shu, Lichun

doi:10.1109/tdei.2014.004214

Cited by 18 publications

(16 citation statements)

References 19 publications

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“…Each pattern of the training set contains 6 inputs and 1 output which represent the critical flashover voltage. All of the input-output variables in the training patterns are normalised within its series before the initiation of the training and test of the neural network (Ahmad et al, 2004;Dong et al, 2014). The comparison of the obtained results using ANN and experimental results is given in Figure 5.…”

Section: Validity Of the Arc Constantsmentioning

confidence: 99%

Artificial Neural Networks (ANN) and Genetic Algorithm Modeling and Identification of arc Parameter in Insulators Flashover Voltage and Leakage Current

Belhouchet

Bayadi

Bendib

2019

IJCAET

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Section: Validity Of the Arc Constantsmentioning

confidence: 99%

Artificial Neural Networks (ANN) and Genetic Algorithm Modeling and Identification of arc Parameter in Insulators Flashover Voltage and Leakage Current

Belhouchet

Bayadi

Bendib

2019

IJCAET

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“…With continued advances in their construction, power grids have become increasingly denser and more widely distributed [2]. The pwer line corridor inevitably passes through areas with cold and wet deposition, where the ice and snow significantly reduce the electrical strength of the insulator [3], [4]. The problem of the icing and snowing of transmission lines is one where the electric field distribution of the umbrella skirt is distorted due to the bridging of the surface of the insulator, which is caused by supercooled water droplets falling on the surface of the insulator [5].…”

Section: Introductionmentioning

confidence: 99%

Studying AC Flashover Performance of Suspension Insulators Under Natural Cold Fog and Wet Deposition Conditions

et al. 2020

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“…Although they represent only about 6% of the total cost of the line, they play a very prominent role for the quality of the transport of the electrical energy. The reliability of the service will be much higher as the choice and the dimensioning of these insulators will be based on a reliable design and take into account external environmental constraints and, particularly, those of pollution [1,2]. The latter usually results in a deposit covering its surface.…”

Section: Introductionmentioning

confidence: 99%

“…The latter usually results in a deposit covering its surface. Under the effect of dew, fog, or rain, the humidification of this deposit can cause a current leakage toward the ground and, in some cases, the flashover of the insulator [1,2]. This can result in the destruction of highly sensitive equipment connected to the power grid.…”

Section: Introductionmentioning

confidence: 99%

“…The direct current test voltage of the insulation is provided by the measuring station shown in Figure 4, which mainly comprises a step-up transformer delivering a secondary voltage of 135 kV and a current of 80 mA. Its output is connected by diode D either in direct connection (1) or indirectly (2) to the weakening resistance of current R a (106 kΩ), in derivation with the smoothing condenser CL (10 nF). In these cases, the connections of the silicone insulation (I s ) and the peak voltmeter (V DC ) are made, respectively, at the boundaries of the resistive voltage divider (R 1 /R 2 ) and at the extremities of the measuring resistor R 2 .…”

Section: Introductionmentioning

confidence: 99%

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Constellation of Condensation and Raindrops and Its Effect on the DC Flashover Voltage of Inclined Silicone Insulation

et al. 2019

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The purpose of this paper is to characterize the arrangement of raindrops and natural condensation and its effect on the direct current voltage's flashover of a hydrophobic silicone insulating surface under variable inclination. Two devices have been realized, one for on-site exposure of insulation samples under rain and condensation, and the other for laboratory use in order to allow the variation of the angle of their inclination. The temporal evolution of the constellation of raindrops and natural condensation as well as the electrical discharge produced in the laboratory was visualized. The results emanated from the on-site investigation allowed the identification of the most reproducible type of arrangement of rainwater and natural condensation drops as well as the estimation of their respective volume. The results from the laboratory clearly show the existence of an interval of the insulation's inclination angle, which allows the best approximation of its electrical performance to what was obtained in the absence of these drops. Moreover, these same results also inform us about some very critical situations to avoid regarding the insulation by a judicious choice of its inclination angle. Energies 2019, 12, 3549 2 of 17Static and dynamic models of flashover of hydrophilic or hydrophobic insulators have been proposed by several researchers to understand the phenomenon of insulator's flashover and its design [12,13]. Their improvement still requires the introduction in these models of other parameters for its better characterization. During the last five decades, a very high taxation of silicone insulation compared to ceramics has been observed in power transmission lines [14,15]. This is justified by the multiple advantages favoring these polymers (lightness, very good hydrophobicity, and its transfer to pollution, as well as very high resistance to pollution and vandalism).On the other hand, the most cited disadvantage of such isolations is the loss of hydrophobicity of their surface and their long-term alteration following the recurrence and the duration of the phenomenon of condensation or natural rain [16,17]. This is due to partial electrical discharges and flashover caused by drops of rainwater or dew deposited on their surface under service voltage. In these investigations, the electrical conductivity of the spray solution or the intensity and the speed of rain falling on the insulators' surface were of interest to most researchers. On the other hand, the geometrical parameters of the fog or rain drops coming into contact with the insulator's surface had attracted very little attention of the researchers [18]. Among these geometric factors that influence the performance of a polymer insulator, we can mention the number of water drops, their size, their angle of fall, their impact speed on the surface, their rebound or bounce, their burst, the distance between the drops, their arrangement along the perimeter, and the leakage path of the insulator. Individually or combined, the effect of these parameters...

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Effect of environment factors on ac flashover performance of 3 units of polluted insulator strings under natural fog condition

Cited by 18 publications

References 19 publications

Artificial Neural Networks (ANN) and Genetic Algorithm Modeling and Identification of arc Parameter in Insulators Flashover Voltage and Leakage Current

Artificial Neural Networks (ANN) and Genetic Algorithm Modeling and Identification of arc Parameter in Insulators Flashover Voltage and Leakage Current

Studying AC Flashover Performance of Suspension Insulators Under Natural Cold Fog and Wet Deposition Conditions

Constellation of Condensation and Raindrops and Its Effect on the DC Flashover Voltage of Inclined Silicone Insulation

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