Factors of influence on surface erosion of epoxy resin exposed to electrical discharges

Refaey, M.; Kindersberger, J.

doi:10.1109/tdei.2014.6832266

Cited by 14 publications

(5 citation statements)

References 15 publications

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“…Effect of relative humidity and subsequent application of corona was carried out and significant reduction in the surface resistivity was observed. Similarly a single needle-plate arrangement with tangential electrical stress has been used in [16], to accurately study the environmental factors on discharge intensity and the erosion of the material. With the advent of HVDC transmission lines and usage of polymeric insulators for HVDC applications, effort has been made in the literature [10,13,17] to study the effect of DC corona.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the influence of negative DC on the degradation is more in comparison with positive DC. In the above cited literature, experiments were conducted in dry air condition [5,8,10], with high relative humidity [4,6,12,14], in open air condition [7,15], and under controlled environment [16]. However, the literature on the corona degradation effect under the influence of moisture or effect due to cold fog is sparse.…”

Section: Introductionmentioning

confidence: 99%

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Effect of coldfog on the corona induced degradation of silicone rubber samples

Reddy

2015

IEEE Trans. Dielect. Electr. Insul.

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Corona is an unavoidable phenomena in high voltage power transmission system, in spite of suitably designed insulator accessories and transmission line hardware. It is a proven fact that the continuous occurrence of corona can subject the polymeric insulator to a severe degradation. Further, moisture in the air has a positive influence on the corona activity. This paper presents the methodology to evaluate the corona performance of the silicone rubber housing material with simultaneous application of cold fog. Analysis conducted after corona treatment by the Fourier Transform Infrared Spectroscopy (FTIR) present an interesting results showing a higher hydroxylation of sample surface under the moisture application than in the normal condition for both AC and DC excitation. FTIR spectrum also indicates the presence of nitric acid on the treated surface with coldfog application. Results obtained from SEM analysis are also presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of coldfog on the corona induced degradation of silicone rubber samples

Reddy

2015

IEEE Trans. Dielect. Electr. Insul.

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“…Mostafa Refaey [8] was investigated that partial discharge intensity is dependent on the magnitude of the test voltage and reaches significant level at higher voltages. His observation was actually expected from the equation used to calculate these quantities, where energy is dependent on the test voltage.…”

Section: Figure 6 Graphic Of Leakage Current Under Wet and Dry Testmentioning

confidence: 99%

The Electrical Performance of Epoxy Resin Insulator under Rain Contaminants

Syakur¹,

Hermawan²

2014

EECSI

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A polymeric insulating material as outdoor insulator has been developed and used on transmission lines and power distribution network. Each material has its own advantages and disadvantages. Generally, polymeric materials have dielectric properties better than the ceramic, glass and porcelain material. Factors affecting performance of outdoor insulators are like rain, humidity, ultraviolet rays, condensation and contaminant. When rain water flow at the insulator surface, they will be easily contaminated and flow current. These events can cause damage to the surface of the insulator and finally cause flashover. To improve the surface properties of materials, silicon rubber material that has the ability to repel water were added. Silica sand was mixed with silicon rubber to improve the mechanical properties. This paper presents the electrical performance of epoxy resin insulator under rain contaminants. The tests were conducted at high voltage laboratory with AC high voltage 50 Hz. Leakage current characteristic of 20 kV outdoor insulators with silane epoxy resin has been investigated under dry and wet condition. The chamber was used to placing the insulator. The research results showed that the leakage currents on insulator surface were affected rain contaminant and magnitude of applied voltage. A minimum leakage current achieved at outdoor insulator without contaminant. For outdoor Insulator under rain contaminant, leakage current tends to increase. Shape of insulator influence the leakage current also was analyzed.

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“…[6]. Corona induced degradation has been one of the topics of research since the polymer insulators are being used in service [7][8][9][10][11][12]. Polymeric insulators when subjected to the corona discharges, lead to loss of hydropobhicity, crack formation, hydroxylation and surface oxidation etc.…”

Section: Introductionmentioning

confidence: 99%

Corona degradation of the polymer insulator samples under different fog conditions

Reddy

2016

IEEE Trans. Dielect. Electr. Insul.

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Corona discharges resulting from the metal parts of insulators and the line hardware affect the long term performance of the polymeric insulators used for outdoor application and can lead to its eventual failure. The authors previous work, involved in developing a new methodology to evaluate the performance of polymeric shed materials subjected to corona stresses in the presence of natural fog condition, results revealed more surface hydroxylation thereby resulting in more loss of hydropobhicity. With the increase in industrialization, there is an increase in acidic component of the rain as well as the fog (moisture). The present work, reports the effect of acid fog on the corona performance of the polymeric insulators for both AC and DC excitation, interesting results are obtained. A comparison of the experimental investigations revealed that the acidic fog has more effect than that of the normal fog. This fact has been confirmed by physico-chemical analysis like the scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS) and contact angle measurement. The effect of DC corona is found to be lesser in comparison with the AC; however the hydroxylation induced by the DC corona under the presence of fog is similar with that of AC excitation.Index Terms -acidic fog, Corona, Fourier transform infrared spectroscopy, moisture, silicone rubber, surface oxidation, leakage current.

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Factors of influence on surface erosion of epoxy resin exposed to electrical discharges

Cited by 14 publications

References 15 publications

Effect of coldfog on the corona induced degradation of silicone rubber samples

Effect of coldfog on the corona induced degradation of silicone rubber samples

The Electrical Performance of Epoxy Resin Insulator under Rain Contaminants

Corona degradation of the polymer insulator samples under different fog conditions

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