Flashover Characteristics of Silicone Rubber Sheets under Various Environmental Conditions

Ali, Arshad; Nekahi, A.; McMeekin, Scott G.; Farzaneh, M.

doi:10.3390/en9090683

Cited by 29 publications

(10 citation statements)

References 39 publications

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“…Note that, in contrast to the standard method, the field dependence of the conductivity Kv (E) is derived from a single SPD characteristic, since the field E in the bulk decays naturally as E (t) ~ vs. (t) and its magnitude is found as the ration of the potential and the thickness of the sample. The SPD rates obtained from the numerical differentiation of the measured SPD characteristics and the values of the dielectric constants from Table 1 were used to calculate Kv according to (1). The obtained field dependences Kv (E) for materials A and B at different temperatures are shown in Figure 5, together with the results of the volume current-based measurements.…”

Section: Bulk Conductivities Deduced From Spd Characteristicsmentioning

confidence: 99%

“…Nowadays, composites based on silicone rubbers become increasingly popular in HVDC insulation due to their high electric withstand performance, lower weight compared to traditionally used porcelain and glass, elasticity, etc. In addition, they provide hydrophobic properties vital for impeding surface leakage currents and thus for enhancing the withstand ability against surface flashovers [1]. To enhance their mechanical and electrical properties and to meet specific requirements for outdoor insulation (e.g., arc endurance), various fillers, such as fumed silica, quartz and alumina try-hydrate (ATH), are added to the base material [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Temperature and Field Induced Variations of Electric Conductivities of HTV Silicone Rubbers Derived from Measured Currents and Surface Potential Decay Characteristics

2020

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The temperature and field dependencies of electric conductivities of two types of silicone rubber-based polymers intended for use in high voltage direct current applications are presented and discussed. The conductivities obtained with the standard method by measuring a current through the material sample placed between metallic electrodes in response to the applied voltage are compared with those deduced from the measured potential decay on pre-charged material surface in an open circuit configuration. The measurements were conducted in the range of the applied electric field strength (0.5–5) kV/mm and temperatures ranging from 22 °C to 70 °C. It is shown that the values of the conductivities obtained by the two methods are in agreement and their temperature dependences obey Arrhenius law yielding similar activation energies.

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Section: Bulk Conductivities Deduced From Spd Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature and Field Induced Variations of Electric Conductivities of HTV Silicone Rubbers Derived from Measured Currents and Surface Potential Decay Characteristics

2020

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“…Nowadays, air pollution is a problem in industrial countries and developing areas of the world [4], [5]. Air pollution constituents, in rain or fog conditions, cause the formation of a conductive layer which leads to flow of leakage current and discharges on transmission line insulators surfaces [6], [7]. Several investigations for various air contaminants and in different parts of the world have been performed and reported in many articles in the literature [8]- [12].…”

Section: Introductionmentioning

confidence: 99%

Laboratory investigation of the impact of air pollution on partial discharge inception voltage of insulators in a specific region

Shafiei

Faghihi

Heydari

et al. 2021

IJECE

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<span lang="EN-US">Studying the discharge characteristics of transmission line insulators in the presence of pollution, particularly when the contaminated layer is wet by rain, fog or condensation, is necessary for selecting the proper insulation. Therefore, identifying the major air pollutants as well as the most effective ones on the discharge performance of outdoor insulators is mandatory. A systematic approach has been proposed to evaluate the impact of dominant air pollutants of an area on partial discharge (P.D) inception voltage of specimen insulators. Based on the suggested method, determining the pollution constituents, defining the dominant pollutant of the area, finding the most commonly used insulators for medium and above distribution voltages within the geographical boundaries of the Central Province of Iran, as well as examining the effect of dominant air pollutant of the region on partial discharge inception voltage of designated insulators by laboratory measurements, are the necessary steps toward a comprehensive study of the subject.</span>

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“…The flashover voltage of an insulator is related to its geometrical parameters (length, profile, position, number of insulators and their connection, location, and type of insulator) and electrical parameters (longitudinal dielectric strength and surface electrical resistance). The degree of their individual or simultaneous effect on their electrical performance has been the subject of several research studies in order to end up in an insulator profile with the best electrical performance [3][4][5][6][7][8][9][10][11]. Figure 1c shows the support on which the 10 samples distributed in two rows are suspended vertically.…”

Section: Introductionmentioning

confidence: 99%

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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Flashover Characteristics of Silicone Rubber Sheets under Various Environmental Conditions

Cited by 29 publications

References 39 publications

Temperature and Field Induced Variations of Electric Conductivities of HTV Silicone Rubbers Derived from Measured Currents and Surface Potential Decay Characteristics

Temperature and Field Induced Variations of Electric Conductivities of HTV Silicone Rubbers Derived from Measured Currents and Surface Potential Decay Characteristics

Laboratory investigation of the impact of air pollution on partial discharge inception voltage of insulators in a specific region

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

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