Electrical and material characterization of field-aged 400 kV silicone rubber composite insulators

Rowland, S. M.; Robertson, J.A.L.; Xiong, Y.; Day, Richard

doi:10.1109/tdei.2010.5448091

Cited by 95 publications

(32 citation statements)

References 13 publications

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“…Also from these images it can be seen that the two sides have different levels of darkness. This difference in brightness may occur because the orientation of the insulator and the resulting asymmetrical ageing due to natural solar UV light previously reported on silicone insulators [4,5]. shows that the region adjacent to the mould line is actually smoother and less crazed than the region a little further away.…”

Section: A Images Of the Surfacesmentioning

confidence: 87%

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Experienced gained from 132 kV EPDM composite insulators in a coastal environment

Rowland

Tzimas

Queen

2011

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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A number of EPDM insulators have been taken from service on a 132 kV system after eight years in a harsh environment and have been examined. Fortuitously three different insulator designs are available and compared. Two of the insulators were installed in a vertical orientation and one in the horizontal. The insulators are characterized visually, electrically and for hydrophobicity. They have been found to be fit for purpose, but show extensive superficial ageing, in particular blackening, of the polymer surfaces. No severe degradation has been identified. In particular there is evidence of discharge activity around the prominent longitudinal mould lines on all the insulators.

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Section: A Images Of the Surfacesmentioning

confidence: 87%

“…An essential step in this process is to understand the processes behind surface ageing of materials before severe damage occurs. Few reports of detailed measurements of service-aged insulators which are still in the early stages of ageing have been published [3][4][5][6]. This paper adds to that knowledge.…”

Section: Introductionmentioning

confidence: 84%

Experienced gained from 132 kV EPDM composite insulators in a coastal environment

Rowland

Tzimas

Queen

2011

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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“…The dimensions of the glass were 25 × 75 mm 2 , with a thickness of 1 mm. The thickness of the RTV coating was also about 1 mm.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…1,2 Compared with glass and porcelain insulators, silicone rubber can deter leakage current and flashover due to the hydrophobicity of the material. 3 However, it also creates some new problems because of the organic nature of silicone rubber; these include surface damage induced by arc discharge.…”

Section: Introductionmentioning

confidence: 99%

Effect of superhydrophobicity on surface damage of silicone rubber under AC voltage

Jin

Nie

et al. 2018

AIP Advances

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In this paper, the influence of superhydrophobicity on the surface damage of silicone rubber is studied. On a common silicone rubber surface, a droplet can become elongated, and arc discharge induced by the droplet can cause tracking on the silicone rubber surface. However, for a superhydrophobic silicone rubber surface, a droplet can leave the silicone rubber due to the low adhesion of the superhydrophobic surface. Accordingly, arc discharge caused by the droplet does not occur, and the surface of the silicone rubber is not affected. Results demonstrate that using a superhydrophobic surface has a significant effect on limiting the surface damage of silicone rubber.

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“…Nevertheless composite insulators still have to compete with the rich history and long service life (over 50 years) that ceramic and glass insulators have. Despite the numerous advantages of the composite insulators over the ceramic ones and the resistance of polysiloxanes and ethylene-propylene based rubbers to weathering, composite insulators do age over time [4]. The rate that composite insulators age is dependent upon the environmental conditions such as electrical stress, geographical location, solar and UV radiation, temperature variations, precipitation as well as wind speed and direction [5].…”

Section: Introductionmentioning

confidence: 99%

Electric field analysis of 132kv EPDM insulator and correlation with ageing features

Tzimas

Zachariades

Rowland

2013

2013 IEEE Electrical Insulation Conference (EIC)

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Abstract-A COMSOL multiphysics electric field analysis of an ethylene-propylene rubber (EPDM) insulator is presented. The 132kV insulator is an inverted post insulator that is taken from a jumper loop. It has been in service in a severely polluted environment for eight years. The insulator's surfaces are asymmetrically aged with organic dark deposits covering the insulator's surface, and with additional surface markings. The insulator has a manufacturing artifact, known as the mold line, which forms an elongated protrusion along the length of the insulator. This artifact is introduced into the COMSOL model to investigate its effect on the local electrical field. The reason for this study is that the area surrounding the mold line is lighter in color, with markings that suggest discharge activity. The regions of the localized field enhancements are identified and correlated with the ageing features, such as hydrophobicity loss, surface roughness and discoloration observed after eight years in service. A discussion whether the environment or the electric field are dominating the ageing process of the insulator is included.

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Electrical and material characterization of field-aged 400 kV silicone rubber composite insulators

Cited by 95 publications

References 13 publications

Experienced gained from 132 kV EPDM composite insulators in a coastal environment

Experienced gained from 132 kV EPDM composite insulators in a coastal environment

Effect of superhydrophobicity on surface damage of silicone rubber under AC voltage

Electric field analysis of 132kv EPDM insulator and correlation with ageing features

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