Aging of nonceramic insulators due to corona from water drops

Phillips, Andrew J. K.; Childs, David; Schneider, H.

doi:10.1109/61.772357

Cited by 164 publications

(67 citation statements)

References 7 publications

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“…The hydrophobic behavior of polymeric materials resists the formation of a uniform pollution layer along the surface leading to water droplets [4]. Numerical simulation of electric field distribution around the water droplets on the insulator surface revealed that dry band along the insulator surface acts as an open circuit and all voltage drops occurs along the dry band leading to high electric field intensity at the edges of dry bands [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Flashover Characteristics of Silicone Rubber Sheets under Various Environmental Conditions

et al. 2016

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Silicone rubber insulators are replacing the conventional ceramic and porcelain insulators rapidly in power transmission and distribution industry. Very limited field knowledge is available about the performance of silicone rubber insulators in polluted and contaminated environments and therefore need further investigation. A comprehensive analysis of silicone rubber sheets (intended for coating outdoor insulators) was carried out in this paper based on experimental results. The main performance parameters analyzed were arc inception voltage and flashover voltage. Dependence of these parameters on equivalent salt deposit density (ESDD), non-soluble salt deposit density (NSDD), relative humidity, ambient temperature, fog rate, dry band formation, dry band location and number of dry bands were investigated extensively. Insulator orientation and its effect on performance were also studied. The authors believe that this paper will provide a comprehensive knowledge about the flashover characteristics of silicone rubber insulators under humid, contaminated and dry band conditions. These results could be used in the selection and design of silicone rubber insulators for polluted environments.

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Section: Introductionmentioning

confidence: 99%

Flashover Characteristics of Silicone Rubber Sheets under Various Environmental Conditions

et al. 2016

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“…1) On the surface of, and in the air surrounding, the polymer weather-shed surface and surrounding the end-fitting seal [9].…”

Section: Effect On Water Droplets On Electric Distributionmentioning

confidence: 99%

Electric Field Distribution under Water Droplet and Effect of Thickness and Conductivity of Pollution Layer on Polymer Insulators Using Finite Element Method

Joneidi¹,

Shayegani²,

Mohseni³

2013

IJCEE

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Abstract-This paper presents the results of electric field and potential distributions simulation along surface of silicone rubber polymer insulators. Finite element method (FEM) is adopted for this paper. Identification of the electrical field and the potential distributions at the dielectric insulation has always been important; The water droplets increase the electric field strength at the insulator surface because of their high permittivity and conductivity, at first the results of water droplets existing on the surface of silicone rubber materials has been investigated and electric field distribution along the surface are shown. Then Different Thickness and conductivity of pollution layer on polymer insulator has been considered and electrical field distribution has been analyzed.

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“…In recent times, a number of experimental studies have focused on evaluating the degradation of polymer material due to corona occurring in wet conditions [1,4]. These studies seem to indicate that high electric fields are intensified even further around the edges of water droplets present on the insulator material during wet weather [2]. The threshold value for the ambient electric field required for initiation of water droplet corona is influenced by the alignment of the droplets with respect to the field.…”

Section: Introductionmentioning

confidence: 99%