Degradation of Silicone Rubber under AC or DC Voltages in Radiation Environment

Rajini, V.; Udayakumar, K.

doi:10.1109/tdei.2009.5128524

Cited by 69 publications

(22 citation statements)

References 31 publications

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“…Silicone rubber (SiR) weathersheds have been examined under DC, with no difficulties reported as long as the insulator creepage distance is selected according to the relative withstand voltages [3]. On the contrary, severe erosion has been reported under DC of silicone rubber based on AC creepage distances [4], [5]. Beyond the validation of composites, understanding the DBA phenomenon under DC is an important aspect in the optimal composition of silicone rubber for HVDC.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the eroding dry-band arcing of filled silicone rubber under DC using wavelet-based multiresolution analysis

Ghunem

Jayaram

Cherney

2014

IEEE Trans. Dielect. Electr. Insul.

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This paper describes an investigation into the dry-band arcing mechanism leading to erosion of filled silicone rubber in the DC inclined plane test. Good correlation is obtained between the formation of surface residue, hotspots and the eroding dry-band arcing. The hotspots detected by infrared camera correlates well with the temperature of degradation determined by thermogravimetric analysis and differential scanning calorimetry. To characterize the physical mechanism of dry-band arcing, wavelet-based multiresolution analysis up to seven levels of resolution is applied to the leakage current waveforms. The analysis shows that both stable and intense discharges characterize the eroding dry-band arcing. A time-to-eroding parameter is proposed to determine the relative resistance to the formation of residue. Faster accumulation of residue is evident under -DC than +DC. Earlier inception of erosion is obtained for the silica filled-as compared to the alumina tri-hydrate filled-silicone, in which the release of the water of hydration is postulated to suppress the residue formation.Index Terms -Inclined plane test, silicone rubber, residue, dry band arcing, hotspot, erosion, wavelet transform, multiresolution analysis, alumina trihydrate filler, silica filler, HVDC insulation.

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Section: Introductionmentioning

confidence: 99%

Investigation into the eroding dry-band arcing of filled silicone rubber under DC using wavelet-based multiresolution analysis

Ghunem

Jayaram

Cherney

2014

IEEE Trans. Dielect. Electr. Insul.

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“…Amidst polymers, EPDM and SiR are the commonly used elastomer materials in harsh environments. Many researchers have investigated the performance of these commonly used polymers [1,2] and also their blends [3][4][5][6][7]. However the property modification by E-beam irradiation on these blends has never been reported.…”

Section: Introductionmentioning

confidence: 99%

Property Enhancement of SiR-EPDM Blend Using Electron Beam Irradiation

Deepalaxmi¹,

Rajini²

2014

Journal of Electrical Engineering and Technology

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-Polymers are the most commonly used di-electrics because of their reliability, availability, ease of fabrication and cost. The commercial and industrial demand for advanced polymeric materials which are capable of being used in harsh environment is need of the hour. The study of the effect of electron beam irradiation on polymeric materials is an area of rapidly increasing interest. This paper discusses the resultant beneficial effects of electron beam irradiation on the SiR-EPDM blend having 50:50 composition. The changes in mechanical and electrical properties of SiR-EPDM blend which are exposed to three different doses of electron beam radiation namely 5 Mrad, 15 Mrad and 25 Mrad are presented. The irradiated blends are analyzed for their electro-mechanical and physico chemical properties. The electrical changes induced by irradiation are investigated by arc resistance, surface resistivity and volume resistivity measurements as per ASTM standards. The mechanical changes are observed by the measurement of tensile strength and elongation at break. Physico chemical investigation has been done using the FTIR, in order to investigate the irradiation induced chemical changes.

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“…However, with the effects of high electric field and various harsh environments, the decrease of hydrophobicity is unavoidable, which will affect the stability and reliability of power system [1][2][3][4][5]. With the decrease of surface hydrophobicity, the formation of conductive layer will be easily accelerated when the silicone rubber insulators are exposed to long-term humidity and severe contamination.…”

Section: Introductionmentioning

confidence: 99%

Characterization of surface discharge as indicator for hydrophobicity evaluation of silicone rubber insulators

Han

et al. 2012

IEEE Trans. Dielect. Electr. Insul.

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A Dynamic drop test (DDT) has been employed for hydrophobicity evaluation, which has proven the occurrence of different discharge phenomena in relation to the hydrophobicity variation. In this paper, based on DDT method, the characterization of surface discharges, including the discharge magnitude, pulse number, adjacent discharge magnitude and adjacent time interval, have been analyzed to evaluate the surface hydrophobicity of silicone rubber insulator. It is found that with the decrease of hydrophobicity, these characteristics apparently show an increasing tendency. The characteristic pattern of discharge pulse and discharge magnitude presents a twin-peak shape, in which both the increase of the discharge magnitude and the discharge pulse number of higher magnitude reflect the decrease of surface hydrophobicity. The characteristic pattern of adjacent discharge magnitude and discharge magnitude emerges to be an 'X' shape composed by the discharge spots, in which the larger value in both the spot density and the shape expansion reveals the decreasing hydrophobicity. The characteristic pattern of next time interval and discharge magnitude demonstrates the frequency of surface discharges increases with the decrease of surface hydrophobicity. Furthermore, the comparability between the discharge characteristic methods and the contact angle method is analyzed to obtain the higher similarity coefficients. Obtained results indicate that the characteristic of surface discharge in DDT method can be utilized to the hydrophobicity evaluation.

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Degradation of Silicone Rubber under AC or DC Voltages in Radiation Environment

Cited by 69 publications

References 31 publications

Investigation into the eroding dry-band arcing of filled silicone rubber under DC using wavelet-based multiresolution analysis

Investigation into the eroding dry-band arcing of filled silicone rubber under DC using wavelet-based multiresolution analysis

Property Enhancement of SiR-EPDM Blend Using Electron Beam Irradiation

Characterization of surface discharge as indicator for hydrophobicity evaluation of silicone rubber insulators

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