Installing insulation jacket to improve outdoor insulation performance of composite insulator

Mei, Hongwei; Peng, Gongmao; Dai, Hanqi; Wang, Liming; Guan, Zhicheng; Cao, L.

doi:10.1109/tdei.2011.6118638

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…Indeed, reports about failures involving polymer insulators have increased in recent years [4][5][6]. As a consequence, studies about corona formation mechanism and its impacts on polymer insulators have been growing in the last years [7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The hydrophobicity of different contaminated surfaces was investigated, and the results show that water droplets change the E-field and reduce corona onset voltage. Experiments with jacket installation to improve composite insulator performance were performed by Mei et al [10]. Gubanski et al and Ma et al presented a broad review on the mechanism of faults and diagnostic methods of polymer insulation [2,[11][12].…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of corona onset in contaminated polymer surfaces

Souza

Lopes

2015

IEEE Trans. Dielect. Electr. Insul.

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Concerns about corona and its harmful effects, particularly in polymer insulators, have increased in recent years. Research involving corona identification, quantification, and formation mechanism is important to understand the aging process and to avoid premature failures. This paper investigates the corona inception and its relation with polymer surface conditions. Experiments of visual corona identification and RadioInterference Voltage (RIV) measurements were performed. Corona onset voltage was investigated in arrangements simulating different service conditions. Wet and contaminated insulating surfaces were reproduced. An RTV coated insulating sample and a polymer insulator were used. The electric field (E-field) at corona onset was numerically evaluated through computational simulations using the Finite Element Method. Corona onset voltage, E-field and RIV were analyzed according to the contamination level. The results clearly show how certain service conditions, particularly the association water droplets and pollution, enhance the E-field and can lead to corona onset.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of corona onset in contaminated polymer surfaces

Souza

Lopes

2015

IEEE Trans. Dielect. Electr. Insul.

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“…Calculation result indicates the voltage distribution along the whole insulator string appears to be a "U" style distribution. [12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Mei designed a silicone rubber jacket installed at the live end of composite insulator to change the capacitance distribution in order to reduce the extremely high electric field strength. Flashover voltage of the composite insulator was thus increased [12]. Dry insulator has extremely high insulation resistance; therefore the effect of insulation resistance can be neglected while analyzing the electric field distribution of insulator.…”

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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“…This system allows redistributing the voltage gradients in the vicinities of the protected high voltage devices and lowering the maximum value of the voltage gradient below the corona threshold, thus minimizing corona activity. It is well known that when the voltage gradient surpasses the surrounding air dielectric strength, corona discharges initiate [1]. When operating under high voltage transmission systems, corona effect is of great concern because of their harmful effects.…”

Section: Introductionmentioning

confidence: 99%

Redesign of a spherical corona shield for UHV substation connectors

Hernandez-Guiteras

Ruiz

Saavedra

2013

4th International Conference on Power Engineering, Energy and Electrical Drives

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When dealing with extra-and ultra-high voltage transmission systems special considerations must be taken into account to minimize corona activity. To minimize its harmful effects often corona shields are required. Depending on the device to protect, corona shields may have different geometries; the most usual are corona caps, toroids and spheres. This work analyzes by means three-dimensional finite elements method simulations the behavior of two spherical shields, i.e. a continuous flat sphere (or standard sphere) and a tubes sphere. Results presented here show that the bar shells allows reducing greatly the weight and ventilates better than the standard solution while ensuring an adequate shielding effect.

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Installing insulation jacket to improve outdoor insulation performance of composite insulator

Cited by 8 publications

References 12 publications

Experimental investigation of corona onset in contaminated polymer surfaces

Experimental investigation of corona onset in contaminated polymer surfaces

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

Redesign of a spherical corona shield for UHV substation connectors

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