Partial discharges of thermally and electrically aged insulation

Pihera, Josef; Martínek, Petr; Klasna, Jan; Paslavský, Bohumil; Polanský, Radek; Mentlík, Václav; Trnka, Pavel

doi:10.1109/ceidp.2009.5377890

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…Unfortunately we are short of researches on the mechanism because there could be various reasons, for example, conductivity attenuation because of water and pollutants intrusion or energy loss in the process of polarization, corona discharge as well as partial discharge at defected sites. All of these phenomena have the potential to cause abnormal heating . Therefore, the analysis of heating mechanism should depend closely on the environment and the aging extent of insulators .…”

Section: Introductionmentioning

confidence: 99%

Mechanism of fracture related heating for 500-kV composite insulators in highly humid areas

Cheng

Wang

Zhang

et al. 2015

Int. Trans. Electr. Energ. Syst.

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Summary With the adoption of composite insulators in the field of high voltage transmission, it is essential to focus on its safety performance. Our study paid attention to the extensive heating within HV ending of 500‐kV AC composite insulators in southern China with high level of humidity and proposed corresponding countermeasures. Via superficial examination, IR and UV test, interface quality inspection, chemical analysis and water absorption test and etc., we were able to study the defected insulators. According to our observation, insulators were slightly covered with pollutants and maintained superficial hydrophobic properties. The heating performance of HV ending of insulators was closely related to humidity as well as the type and site of loading voltage. We suggested that when exposed to high humidity, polarization of the molecules from water, polar groups of material and the interlayer resulted in the abnormal heating; on the other hand, when the environment humidity was low the heating was attributed to partial discharge. Consequently, we provided several solutions toward the issue according to our observations. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Mechanism of fracture related heating for 500-kV composite insulators in highly humid areas

Cheng

Wang

Zhang

et al. 2015

Int. Trans. Electr. Energ. Syst.

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“…For the first minutes the temperature rise inside the lamination stack caused by the losses inside the windings should nearly not differ according to (2), because the energy input of the windings is relatively small compared to the mass and thermal capacity of the lamination stack. The influence of the surrounding air can be neglected, because the general room temperature is constant at the beginning.…”

Section: B Thermal Behaviormentioning

confidence: 98%

“…Furthermore, the resin protects the windings against environmental influences such as transmission fluid. All mentioned characteristics of the impregnation have a positive impact on the lifetime of the electrical machine [2].…”

Section: Introductionmentioning

confidence: 99%

Influence of different impregnation methods and resins on thermal behavior and lifetime of electrical stators

Richnow

Stenzel

Renner

et al. 2014

2014 4th International Electric Drives Production Conference (EDPC)

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The relationship between impregnation process and winding temperature has not been analyzed in detail yet. Therefore, one purpose of this paper is to investigate the correlation between impregnation process, resin absorption, applied resin, and thermal behavior. Apart from thermal behavior, it has to be ensured that the lifetime of the manufactured electrical machines still meets industrial specifications. The lifetime is primarily affected by the quality of the insulation system. So the second purpose of this paper is to investigate the influence of the named aspects on the lifetime of an electrical machine.

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“…Ice-shedding happens when the ice formed on conductors suddenly drops off (under natural conditions, such as temperature rise and wind action or man-made shocks) [1]. This will cause high-amplitude oscillations of the conductors and large transient forces on the insulators and towers [2]. Also this may lead to the flashover if the phase-to-phase or phase-to-tower distance is smaller than the tolerable insulation distance.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Overhead Power Lines after Ice–Shedding Using Finite Element Method

Muŕın

Hrabovský

Gogola

et al. 2016

Journal of Electrical Engineering

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In this paper, the analysis of ice-shedding from ACSR conductors to its swing up height and vibration using Finite Element Method (FEM) is presented. For the numerical simulations the effective material properties of the ACSR conductor are calculated using the homogenisation method. Numerical analysis concerning vibration of one and triple-bundle conductors with icing for a whole range or on their certain parts are performed. The impact of ice-shedding to the mechanical tension in the conductors at the points of attachment is investigated and evaluated. Identification of the impact of ice-shedding from the ACSR conductors on its mechanical state may contribute to increasing the safety and quality of an electrical transmission system.

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Partial discharges of thermally and electrically aged insulation

Cited by 8 publications

References 2 publications

Mechanism of fracture related heating for 500-kV composite insulators in highly humid areas

Mechanism of fracture related heating for 500-kV composite insulators in highly humid areas

Influence of different impregnation methods and resins on thermal behavior and lifetime of electrical stators

Dynamic Analysis of Overhead Power Lines after Ice–Shedding Using Finite Element Method

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