The effect of thermal characteristics of power line insulators on pollution performance

Vosloo, W.L.; Holtzhausen, J.P.

doi:10.1109/afrcon.2002.1159979

Cited by 4 publications

(26 citation statements)

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“…Content may change prior to final publication. In addition, this case was in line with [10,12,15,17,18,26] because the rise in the local time occurred between 04:00 and 08:00. According to Pieterse et al [10], it occurred on the relatively low creepage distance of 615 mm, rather than the high creepage distance of 1175 mm.…”

Section: Figure 3sample Waveforms Of the Jpeg Picturesupporting

confidence: 77%

“…Thus, the porcelain insulator is more susceptible to temperature influence than silicone rubber is. Visually, the insulator leakage currents decreased as the environmental temperature increased, and this phenomenon is in line with [8,12,17]. Castillo-Sierra et al [8] and Vosloo and Holtzhausen [17] stated that at noon the temperature rose with a decrease in the leakage currents.…”

Section: Lc Variations Against the Natural Temperaturesupporting

confidence: 63%

“…The research conducted by Wang et al [12] and Zhao et al [26] described that the increase in the leakage current was probably caused by the increase in humidity. However, Vosloo et al [17][18] described that it was caused by wet conditions at critical wetting times (3:00 to 5:00), which eventually increased the surface conductivity.…”

Section: Figure 3sample Waveforms Of the Jpeg Picturementioning

confidence: 99%

“…Vosloo et al [16] reported a maximum peak of negative and positive leakage currents on SIR and EPDM, which were relatively high and low for approximately half at the beginning and at the end, respectively. Additionally, Vosloo and Holtzhausen [17] presented the porcelain LC and temperature, which were recorded daily. The results showed that during the daytime, the temperature rose while the leakage current decreased.…”

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The Evaluation of Daily Comparative Leakage Currents on Porcelain and Silicone Rubber Insulators Under Natural Environmental Conditions

2021

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In this research, the leakage current (LC) and applied voltage waveforms on samples of installed outdoor porcelain and silicone rubber (SIR) insulators were measured by using a storage digital oscilloscope concurrent with humidity, temperature, and illuminance measurements. Essentially, the measurements were conducted daily, every three hours, for thirty days, and the data were analyzed using exponential regressions, box plots, and correlation coefficients. The porcelain and SIR insulator leakage currents varied from 23.7 A to 28.8 A and 8.4 A to 10.35 A for median values, respectively, while for outlier excluded values, they varied from 20.3 A to 40.0 A and 5.1 A to 17.1 A, respectively. Both leakage currents slightly increased as the exposure duration of the insulator rose, while the ratio decreased very slightly. Additionally, the leakage currents decreased moderately and slightly as the temperature and illuminance increased, respectively. However, the parabolic leakage currents increased as the humidity rose, especially at high humidity. Therefore, the porcelain insulator was more susceptible than the daily SIR, while the SIR insulator was more highly influenced by aging of the exposure duration. The rainy condition contributed to the highest leakage currents on both insulators, whereas the drizzle condition contributed to the highest leakage current on the SIR insulator. The total harmonic distortion (THD) and phase angle of the porcelain insulator leakage currents experienced differences of 5.8% and 7.8 degrees in the minimum and maximum humidity, respectively, but both quantities were less for the SIR insulator. INDEX TERMS humidity, leakage current, porcelain, silicone rubber I. INTRODUCTION High voltage outdoor insulators have an important role in electrical power transmission and distribution systems, including operational reliability, safety, and efficiency [1]. However, their functions are mostly influenced by environmental conditions [2-3]. Common insulator materials include glass and porcelain, which are ceramic materials that have been used for hundreds of years. Moreover, composite and cast cycloaliphatic epoxy resin (epoxy resin, ER), as a polymeric category, has been used in the last few decades [3-4]. These insulators have sheds for reducing the electric field stress and tolerating the accumulation of pollution [5]. Currently, research conducted on insulator leakage currents based on daily time functions is limited. Vosloo et al. [6] illustrated the average peak leakage currents on some insulators, and Roman et al. [7] monitored the insitu dc leakage current magnitudes, namely, rain, humidity, and temperature, on composite and glass insulators. According to Castillo-Sierra et al. [8], the ceramic insulator leakage currents were measured using a clamp meter, as were the temperature and humidity, followed by a regression analysis. Further research by Vosloo and Holtzhausen [9] showed that the peak leakage current of porcelain insulators, including precipitation, relative humidity (RH), ul...

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Section: Figure 3sample Waveforms Of the Jpeg Picturesupporting

confidence: 77%

Section: Lc Variations Against the Natural Temperaturesupporting

confidence: 63%

Section: Figure 3sample Waveforms Of the Jpeg Picturementioning

confidence: 99%

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The Evaluation of Daily Comparative Leakage Currents on Porcelain and Silicone Rubber Insulators Under Natural Environmental Conditions

2021

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“…Regarding field experiment of RTV silicone rubber coated and uncoated insulators, the actual environmental condition had real impact to the measurement result, since the weather actually caused heating and cooling process on the insulator surface. The insulator surface condition would further affect the insulator thermal characteristic [22]. The insulator thermal characteristic in this experiment is shown in Figure 11.…”

Section: B Surface Temperaturementioning

confidence: 88%

The Study on Leakage Current Characteristics and Electrical Properties of Uncoated Ceramic, RTV Silicon Rubber Coated Ceramic, and Semiconducting Glazed Outdoor Insulators

Rachmawati¹,

Sartika²,

Putra³

et al. 2018

IJEEI

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Insulator is one of the most important equipment in an electric power system. Failure of insulator may interrupt the electric energy delivery. The system reliability is greatly affected by the performance of the insulator. Therefore, ensuring the high performance of insulators has become indispensable. There are many methods to increase the performance of the outdoor insulator that are exposed to environmental conditions, such as temperature, humidity, and the presence of pollutants. Among the methods, applying room temperature vulcanized (RTV) silicone rubber coating and semiconducting glaze on the insulator surface are often used. This paper discusses the performance of uncoated ceramic insulator, RTV silicone rubber coated insulator, and semiconducting glazed insulator (SGI), as well as the comparison result among them. The performance is indicated by measuring leakage current (LC), surface temperature, and hydrophobicity. In addition, computer simulation on outdoor insulators using ATPDraw software is also conducted for LC waveform resulted by each type of insulator in order to study the electrical properties of each insulator. In the simulation, an outdoor insulator is represented by an electrical circuit model consisting of capacitors, nonlinear resistors, and number of arc models. AC voltage is applied to the model and the current is monitored. Hence, some key parameters of LC waveform are required to determine the similarity between measured LC waveform and simulated LC waveform, which are LC magnitude, Total Harmonic Distortion (THD), and dominant harmonic number. Experiment result shows that LC waveform and magnitude are strongly affected by the applied voltage, environmental condition, and the condition of the insulator surface itself. Specifically for SGI, LC waveforms are generally similar with the sinusoidal applied voltage. The LC waveforms are also symmetrical for positive and negative half cycles and no flashover was observed for applied voltage up to 40 kV. The hydrophobicity of insulator surface decreases after the experiments, with the pollutant presence and salt fog condition cause higher reduction compared to the clean samples and in clean fog environment. SGI has higher hydrophobicity compared to ceramic insulator. Field-aged RTV silicone rubber coated insulator shows higher hydrophobicity compared to field-aged uncoated ceramic insulator. At the end of the 6 th year, the difference of contact angle between the two types of insulators can reach up to 50 -60°. This proves that less pollutant is likely to stick on coated insulators for long time. The LC waveforms obtained from all experiments both in the laboratory or in the field have been successfully simulated through computer simulation. The simulation indicated that SGI is more capacitive than normal ceramic insulator and has lower values of piecewise resistance of the nonlinear resistance, resulting LC flow on the insulator surface also much higher. Despite the increased applied voltage, SGI shows very little discharge on its...

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Influence of heat conductivity on the performance of RTV SIR coatings with different fillers

Siderakis

Agoris

Gubanski

2005

J. Phys. D: Appl. Phys.

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Room temperature vulcanized silicone rubber (RTV SIR) coatings are employed in order to improve the pollution performance of high voltage ceramic insulators by imparting surface hydrophobicity. In this paper, the performance of three RTV SIR coatings containing different fillers is investigated in a salt–fog test. Alumina trihydrate (ATH) and silica are the fillers included in the formulation, aiming to increase the material endurance to the energy supplied by the surface electrical activity during periods of hydrophobicity loss. The primary action of these fillers is to increase the material heat conductivity, i.e. the amount of energy conducted to the substrate. In addition, in the case of ATH relief is also achieved due to particle decomposition. The results indicate that for the compositions commercially available, where low amounts of fillers are used, and under the conditions of the test, ATH filled coatings performed better than the silica filled ones. This is attributed to ATH decomposition which further relieves the material structure and therefore decelerates material aging.

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The effect of thermal characteristics of power line insulators on pollution performance

Cited by 4 publications

References 0 publications

The Evaluation of Daily Comparative Leakage Currents on Porcelain and Silicone Rubber Insulators Under Natural Environmental Conditions

The Evaluation of Daily Comparative Leakage Currents on Porcelain and Silicone Rubber Insulators Under Natural Environmental Conditions

The Study on Leakage Current Characteristics and Electrical Properties of Uncoated Ceramic, RTV Silicon Rubber Coated Ceramic, and Semiconducting Glazed Outdoor Insulators

Influence of heat conductivity on the performance of RTV SIR coatings with different fillers

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