Reproduction and Analysis of Decay-Like Aging Development Induced by Interfacial Discharge in Composite Insulators

Peng, Yanan; Li, Wendong; Zeng, Shiyin; Zhang, Yucheng; Deng, Yu; Peng, Bo; Liu, Jinghua; Yang, Hongjun; Zhang, Guan-Jun

doi:10.1109/tdei.2023.3266185

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…The experimental results demonstrated that the sheath-mandrel interfacial discharge phenomenon triggers the decomposition of epoxy resins in the FRP mandrels, exposing glass fibers. Peng et al artificially reproduced the generation and development of fiber-reinforced plastic (FRP) mandrel decay like aging in the laboratory [19].…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on the sheath-core bar interface of composite insulators: a molecular dynamics and DFT study

Xie,

Qiao,

Liu

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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The functioning condition of composite insulators is greatly influenced bythe sheath-mandrel interface. In this work, the effects of temperature on thesheath-mandrel system are examined using molecular modeling, taking into accountboth density functional theory (DFT) and molecular dynamics (MD). The system'sinterfacial free volume, HOMO/LUMO, number of hydrogen bonds, bond order, center-of-mass distance, and other characteristics define its degradation mechanism. The findings demonstrate that elevated temperatures have the potential to increase theinterfacial free volume, the center-of-mass distance, and significantly reduce thenumber of hydrogen bonds. In addition, DFT simulations show that the bondingstrength and non-bonding forces between the interfaces weaken with increasingtemperature.High temperatures significantly boost the reactivity of the epoxy resinand silicone rubber chains, indicating that the system's response with some intruderswill be catalyzed by the temperature increase.This work looks at the temperaturedependence of the sheath-core bar interface degradation from a microscopicperspective, which is important for enhancing the overall performance of compositeinsulators.

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Section: Introductionmentioning

confidence: 99%

Temperature effects on the sheath-core bar interface of composite insulators: a molecular dynamics and DFT study

Xie,

Qiao,

Liu

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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“…Zhong et al [16] measured the impact of environmental humidity on the temperature rise of brittle composite insulators, and Xu et al [17] designed a laboratory multi-factor brittle aging platform to study the aging characteristics of core rods. Zhang et al [18]- [21] simulated the decay-like aging of core rods and explored the development process. However, on-site operation experience indicates that the early manifestations of decaylike aging are similar to the electrical internal breakdown of insulator, suggesting that decay-like aging may originate from interface discharge [22], [23].…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of Composite Insulators Deterioration and Decay-Like Aging Caused by Internal Discharge in Transmission Lines

Gao,

Peng,

Zhang

et al. 2023

IEEE Access

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Internal discharges in composite insulators often cause abnormal heating, interface failure and erosion of the core rod. However, the mechanism and the exact process of the degradation of HTV shed and FRP core rod caused by internal discharges are still unclear. In this work, abnormal heating insulator samples are taken from an AC 500 kV extra-high voltage (EHV) transmission line. Macro-and micro-scopic morphological observation, hardness tests, industrial CT tests and chemical property tests are applied on the samples. The cause of heating and the deterioration mechanism of each part of insulators is further explored. Cavities and air holes are found in the HTV skirts in this batch of insulators, which are generated during manufacturing. These cavities lead to the distortion of electrical field and become the origin of the discharges. Decomposition of polydimethylsiloxane leads to the hardening and chalking of the HTV shed. It is also found that the adhesive in the rod-housing interface fails during operation. Epoxy resin in core rod decomposes in a multi-factor aging environment, leading to the decay-like aging of the core rod surface. As the aging progress develops inward, the insulator will eventually lose its mechanical properties. It is inferred that the internal discharge is the main reason of heating and deterioration of composite insulators. Moreover, long-term discharge will lead to the decay-like aging of core rods.INDEX TERMS composite insulator, decay-like aging, transmission line, aging analysis, industrial CT

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Analysis of the Influence of Metal Powder Contamination on the Flashover Characteristics of Insulators

Fangrong,

Zhijin,

Dong

et al. 2024

Lecture Notes in Electrical Engineering

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Reproduction and Analysis of Decay-Like Aging Development Induced by Interfacial Discharge in Composite Insulators

Cited by 7 publications

References 13 publications

Temperature effects on the sheath-core bar interface of composite insulators: a molecular dynamics and DFT study

Temperature effects on the sheath-core bar interface of composite insulators: a molecular dynamics and DFT study

Mechanism Analysis of Composite Insulators Deterioration and Decay-Like Aging Caused by Internal Discharge in Transmission Lines

Analysis of the Influence of Metal Powder Contamination on the Flashover Characteristics of Insulators

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