The Influence of Temperature and Aging on the Characteristic Parameters of Dielectric Spectroscopy of Epoxy Resin Impregnated Paper Insulation

Wang, Yongqiang; Luo, Yi; Feng, Chao

doi:10.1007/s13233-019-7136-y

Cited by 7 publications

(1 citation statement)

References 13 publications

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“…Under the The associate editor coordinating the review of this manuscript and approving it for publication was Boxue Du . long-term action of high temperature and high pressure, the valve bushing of the converter transformer is prone to insulation degradation, affecting the safe, stable operation of the converter transformer. Epoxy resin-impregnated paper insulation is prone to aging discharge breakdown of its electrical tree under multi-factor long-term effects imposed by such a complex environment, which causes the solid insulation performance of the equipment to be severely reduced, never to be recovered [2], [3].…”

Section: Introductionmentioning

confidence: 99%

The Development of Electrical Tree Discharge in Epoxy Resin Impregnated Paper Insulation

2020

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An electrical tree discharge model of multilayer insulation paper was prepared, and a voltage of 20 kV was used for electrical tree cultivation and initiation tests. Based on the microscopic image information and partial discharge (PD) information during the aging of the electrical tree, the development of electrical tree discharges between layers of paper comprising epoxy resin-impregnated paper insulation was studied. The results show that, by analysing PD information such as the discharge volume phase spectrum and the discharge repetition rate phase spectrum, the development of the electrical tree branch progresses in four stages: initial, growth, stagnation, and bursting. During the growth and stagnation stages, the main discharge paths of the electrical tree are mainly formed, and there are many filamentous fibres on the path edge. During the burst stage, more branches will be formed on the electrical tree, which will cause the greatest damage to the insulation. With the extension of the electrical tree path, the discharge magnitude and discharge times also increase. There are specific discharge patterns in different growth stages of the electrical tree, and the number of discharge events in each positive half-cycle is significantly greater than that in a negative half-cycle. Combining the microscopic image information and PD information during the aging of such an electrical tree, a theoretical basis for evaluating insulation state by PD monitoring is realised. The long-chain molecules of cellulose and epoxy resin break bonds and oxidise, which decompose into a large number of free radicals, monosaccharides, and other low-molecular-weight products.INDEX TERMS Partial discharge, electrical tree, growth characteristics, epoxy resin-impregnated paper, micromorphology, Fourier transform infrared spectroscopy.

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Section: Introductionmentioning

confidence: 99%

The Development of Electrical Tree Discharge in Epoxy Resin Impregnated Paper Insulation

2020

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On-line Monitoring System for Dielectric Loss of Capacitive Bushing Considering Harmonic Effects

Mao

Niu

et al. 2020

J. Phys.: Conf. Ser.

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The existence of harmonic waves may cause some errors during measurement of dielectric loss, thus hindering accurate evaluation of insulation. By taking the influence caused by harmonic waves into consideration, this article introduces an approach which may achieve higher accuracy in the calculation of dielectric loss. Calculation results show that harmonic components and orders of harmonic waves may have big impact on dielectric loss. This article also develops a dielectric loss on-line monitoring system based on bus, which can fulfill tasks including signal conditioning, data acquisition and conversion, upper computer communication and data transmission. This system uses A/D conversion controlled by industrial computer to implement remote communication and synchronous sampling of harmonic waves and is able to able to improve accuracy of dielectric loss under the influence of high order harmonics, therefore, make accurate on-line evaluation of equipment’s insulative conditions.

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Influence of Thermal Aging on the Evolution of Dielectric and Physical Properties in Resin-impregnated Paper

Yan,

Qi,

Zhang

et al. 2024

2024 IEEE 7th International Electrical and Energy Conference (CIEEC)

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The Influence of Temperature and Aging on the Characteristic Parameters of Dielectric Spectroscopy of Epoxy Resin Impregnated Paper Insulation

Cited by 7 publications

References 13 publications

The Development of Electrical Tree Discharge in Epoxy Resin Impregnated Paper Insulation

The Development of Electrical Tree Discharge in Epoxy Resin Impregnated Paper Insulation

On-line Monitoring System for Dielectric Loss of Capacitive Bushing Considering Harmonic Effects

Influence of Thermal Aging on the Evolution of Dielectric and Physical Properties in Resin-impregnated Paper

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