Effect of inclination angle of hydrophobic silicone insulation covered by water drops on its DC performance

Boudissa, Rabah; Belhoul, Talit; Haim, Klaus Dieter; Kornhuber, Stefan

doi:10.1109/tdei.2017.006543

Cited by 12 publications

(9 citation statements)

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“…The distance l rr separating two successive rows over the width of the insulation is set at 10 mm during these tests. These values were selected on the basis of the results obtained in the literature [19]. The measurement results of the characteristic of the silicone insulation's flashover voltage as a function of the number of rows of water drops are illustrated in Figure 10.…”

Section: Number Of Rows Of Water Dropsmentioning

confidence: 99%

“…Then they are deposited in a desiccator in order to gain back, before the next test series, their hydrophobicity that is partially lost during their flashover by electric discharges [16,17]. The pause time interval between two successive tests on the same test sample is equal to 10 hours [19].…”

Section: Introductionmentioning

confidence: 99%

“…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 is reflected in the degree of wetting of the insulator's leakage path and the resulting number of partial electrical discharges, hence, the degree of degradation of the insulation surface and its electrical performance.Other sizes concerning the profile of the insulator, such as, the angle of inclination with respect to the horizontal line of an insulator's sheds may exert an influence, depending on the value of the inclination's angle of the insulation [11,19,20], on the constellation and the volume of raindrops covering its surface. Regarding the stagnation effect of the amount of rainwater on the periphery of the slightly inclined sheds of some insulators, on the elevation of the damp leakage path of the insulator, and, consequently, the decrease of its power of electrical isolation, very few published works focused on this area [11,19,20].…”

mentioning

confidence: 99%

“…Individually or combined, the effect of these parameters is reflected in the degree of wetting of the insulator's leakage path and the resulting number of partial electrical discharges, hence, the degree of degradation of the insulation surface and its electrical performance.Other sizes concerning the profile of the insulator, such as, the angle of inclination with respect to the horizontal line of an insulator's sheds may exert an influence, depending on the value of the inclination's angle of the insulation [11,19,20], on the constellation and the volume of raindrops covering its surface. Regarding the stagnation effect of the amount of rainwater on the periphery of the slightly inclined sheds of some insulators, on the elevation of the damp leakage path of the insulator, and, consequently, the decrease of its power of electrical isolation, very few published works focused on this area [11,19,20]. These multiple reasons justify our interest focused, initially, on the characterization of the constellation and volume of water drops formed on the surface of silicone insulators during condensation and natural rainfall phenomena.In the second step, the constellation of water drops obtained on site is reproduced in the laboratory on silicone insulation with quantification of its flashover voltage, according to its angle of inclination, the volume of the water drops, and the degree of water accumulation on the surface of the insulation neighboring the grounded electrode.…”

mentioning

confidence: 99%

“…Other sizes concerning the profile of the insulator, such as, the angle of inclination with respect to the horizontal line of an insulator's sheds may exert an influence, depending on the value of the inclination's angle of the insulation [11,19,20], on the constellation and the volume of raindrops covering its surface. Regarding the stagnation effect of the amount of rainwater on the periphery of the slightly inclined sheds of some insulators, on the elevation of the damp leakage path of the insulator, and, consequently, the decrease of its power of electrical isolation, very few published works focused on this area [11,19,20]. These multiple reasons justify our interest focused, initially, on the characterization of the constellation and volume of water drops formed on the surface of silicone insulators during condensation and natural rainfall phenomena.…”

mentioning

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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Section: Number Of Rows Of Water Dropsmentioning

confidence: 99%