Hydrophobicity transfer from silicone rubber to adhering pollutants and its effect on insulator performance

Swift, D.A.; Spellman, C. A.; Haddad, A.

doi:10.1109/tdei.2006.1667741

Cited by 94 publications

(30 citation statements)

References 7 publications

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“…The hydrophobic properties of the material may diminish over time allowing the formation of continuous water paths when the insulator becomes wet [4].…”

Section: Instrumentationmentioning

confidence: 99%

Real-time monitoring of leakage current on insulating cross-arms in relation to local weather conditions

Zachariades

Rowland

Cotton

2013

2013 IEEE Electrical Insulation Conference (EIC)

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“…The hydrophobic properties of the material may diminish over time allowing the formation of continuous water paths when the insulator becomes wet [4].…”

Section: Instrumentationmentioning

confidence: 99%

Real-time monitoring of leakage current on insulating cross-arms in relation to local weather conditions

Zachariades

Rowland

Cotton

2013

2013 IEEE Electrical Insulation Conference (EIC)

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“…The main reason is the excellent hydrophobic properties of the composite insulators especially in coastal polluted environments [1]. The number of utilities that are installing composite insulators is increasing [2] as confidence is gained on their performance [3].…”

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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“…Polymeric insulators, made up of composite materials such as silicone rubber and EPDM have the advantage of hydrophobic properties. In addition, the hydrophobicity can be restored and transferred to an overlying pollution layer on the insulator surface [2].…”

Section: Introductionmentioning

confidence: 99%

Stress control on polymeric outdoor insulators using Zinc oxide microvaristor composites

Rahman

Haddad

Harid

et al. 2012

IEEE Trans. Dielect. Electr. Insul.

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An approach to high field control, particularly in the areas near the high voltage (HV) and ground terminals of an outdoor insulator, is proposed using a nonlinear grading material; Zinc Oxide (ZnO) microvaristors compounded with other polymeric materials to obtain the required properties and allow easy application. The electrical properties of the microvaristor compounds are characterised by a nonlinear fielddependent conductivity. This paper describes the principles of the proposed fieldcontrol solution and demonstrates the effectiveness of the proposed approach in controlling the electric field along insulator profiles. A case study is carried out for a typical 11 kV polymeric insulator design to highlight the merits of the grading approach. Analysis of electric potential and field distributions on the insulator surface is described under dry clean and uniformly contaminated surface conditions for both standard and microvaristor-graded insulators. The grading and optimisation principles to allow better performance are investigated to improve the performance of the insulator both under steady state operation and under surge conditions. Furthermore, the dissipated power and associated heat are derived to examine surface heating and losses in the grading regions and for the complete insulator. Preliminary tests on inhouse prototype insulators have confirmed better flashover performance of the proposed graded insulator with a 21 % increase in flashover voltage.

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Hydrophobicity transfer from silicone rubber to adhering pollutants and its effect on insulator performance

Cited by 94 publications

References 7 publications

Real-time monitoring of leakage current on insulating cross-arms in relation to local weather conditions

Real-time monitoring of leakage current on insulating cross-arms in relation to local weather conditions

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

Stress control on polymeric outdoor insulators using Zinc oxide microvaristor composites

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