Nonceramic insulators for transmission lines

Schneider, H.; Hall, J.F.; Karady, G.G.; Rendowden, J.

doi:10.1109/61.35649

Cited by 97 publications

(15 citation statements)

References 3 publications

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“…High temperature vulcanizing (HTV) silicones have improved mechanical strength over RTV's and are employed as material for insulator sheds, especially for transmission class suspension insulators, bushing sheds, arrester housings, etc. Silicone high voltage sheds are gaining market share as a result of improved tolerance to pollution, ease of handling and installation, and resistance to vandalism [3], [4]. However, the surface of silicones, and especially filled silicones, is subject to long-term degradation during outdoor use [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of surface degradation of silicone rubber using gas chromatography/mass spectroscopy

Homma

Kuroyagi

Izumi

et al. 2000

IEEE Trans. Power Delivery

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Analysis using Gas Chromatography/Mass Spectroscopy (GC/MS) was performed for evaluation of surface degradation of silicone insulating materials. Silicones are used as coatings for porcelain insulators and shed material for high voltage composite insulators. A comparison between virgin silicone rubber and aged silicone rubber samples, which were aged either on actual power lines or during a field exposure test, was made by GC/MS analysis. The GC/MS spectrum of siloxane in silicone rubber has a series of peaks which corresponds to the number of dimethylsiloxane units in the molecule. We found that the aged samples had a larger concentration of low molecular weight siloxane species than the virgin samples. The top shed surfaces generated more low molecular weight siloxane species than the bottom shed surfaces. Since GC/MS analysis can determine the molecular weight distribution of polymer insulating materials, evaluation of the degree of surface degradation and estimation of the remaining life of insulators may be possible.

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Section: Introductionmentioning

confidence: 99%

Evaluation of surface degradation of silicone rubber using gas chromatography/mass spectroscopy

Homma

Kuroyagi

Izumi

et al. 2000

IEEE Trans. Power Delivery

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“…Composite insulators are being increasingly used by power utilities because of their advantageous over porcelain and glass insulators [2][3][4][5][6][7]. They have been used in Turkish Power Transmission Systems for six years, and their usage is expected to increase in the future.…”

Section: Introductionmentioning

confidence: 99%

Impacts of corona rings on the insulation performance of composite polymer insulator strings

İlhan

Özdemir

Ismailoglu

2015

IEEE Trans. Dielect. Electr. Insul.

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Corona rings can improve the insulation performance of insulator strings because of their electric field grading property or can decrease the insulation performance due to their arc clearance reduction property. The resulting insulation performance of the string which is under the influence of those two conflicting effects depends on the corona ring parameter settings. Therefore, a detailed experimental work is required to determine the insulation performance for different types of test voltages under different ambient conditions. This paper presents the results of experimental studies regarding the effects of corona rings on the insulation performance of 380 kV non-ceramic V-insulator strings. Those effects and flashover routes were determined for lightning impulses, switching impulses and AC voltages. Corona ring diameter, corona tube diameter, and mounting height were selected as the ring design parameters. Experimental studies were performed for the strings including corona rings of different design parameters as well as for the ring free strings. Test results were discussed from discharge development physics point of view and optimal configuration was determined for the strings.

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“…However, the voltage and electric field are unevenly distributed along the composite insulator, which means particular positions of the insulator may suffer from extreme electric filed stress and could cause deterioration of the insulation material. Operation reports indicated several problems when using composite insulator: tracking and erosion of the shed material; chalking and crazing of insulator surface; reduction of contamination flashover strength; deterioration of mechanical strength [6], and decreased corona inception voltage [7][8][9][10]. These defects in composite insulators may result in power failure which threatened the safety of power systems.…”

Section: Introductionmentioning

confidence: 99%

Influence on voltage distribution of composite insulator by inserting metal electrodes in weather sheds

Chen

Mei

Zhu

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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The uneven distribution of voltage along the composite insulator strings harmed their electrical and mechanical properties heavily, which threatened the safety of power system. Inserting metal electrodes in the silicone rubber sheds of composite insulator helps increase their self-capacitance, thereby ameliorating the voltage distribution along the string. In this paper, a new structure of weather sheds with metal electrodes inserted has been designed. Tests on composite insulators with different metal electrodes setup were conducted to examine their voltage distribution performance. Corona inception voltage of the mentioned composite insulators was obtained by a remote monitoring system as a criterion of the voltage distribution performance. Simulation model of the insulators were set up and calculation of their voltage and electric field distribution were carried out by finite element method (FEM). The calculation result was in good compliance with the experiment result. The applied voltage at the live end of composite insulator decreased by 4% when inserting electrodes in the weather sheds, which was verified by both experiment and simulation results.

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Nonceramic insulators for transmission lines

Cited by 97 publications

References 3 publications

Evaluation of surface degradation of silicone rubber using gas chromatography/mass spectroscopy

Evaluation of surface degradation of silicone rubber using gas chromatography/mass spectroscopy

Impacts of corona rings on the insulation performance of composite polymer insulator strings

Influence on voltage distribution of composite insulator by inserting metal electrodes in weather sheds

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