Study of epoxy/mica insulation deterioration in generator stator using ultra-wide band partial discharge testing technique

Chen, Xiaolin; Cheng, Yonghong; Yang, Bo; Xie, Hui

doi:10.1016/j.polymertesting.2006.05.011

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…The long‐term operation under thermal electric field and the PD can also cause insulator deterioration and decreased insulation performance. Figure 6b shows a SEM photo of the severe‐aged epoxy insulation [18]. Besides, as the insulator service time increases, the SF 6 arc by‐products also reduce the insulator insulation performance.…”

Section: Insulator Defectmentioning

confidence: 99%

Defects and failure types of solid insulation in gas‐insulated switchgear: In situ study and case analysis

et al. 2021

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The gas-insulated switchgear (GIS) has been widely used in modern ultra-high voltage systems. However, once it fails, its fully enclosed feature brings challenges in its diagnosis and maintenance. As the failure rate of GIS due to insulator failure has been increasing in recent years, it is necessary and important to understand the commonly existing defects presented in the insulator. First, the manufacturing process of GIS insulators is introduced here. The defect types commonly existing in the insulator are categorised. The failure of GIS due to insulator defects that occurred in recent years are reviewed and discussed. The content in this study is useful for engineers and scientists to study on the GIS solid insulation defects and their failure mechanisms.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Section: Insulator Defectmentioning

confidence: 99%

Defects and failure types of solid insulation in gas‐insulated switchgear: In situ study and case analysis

et al. 2021

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“…One of the main polymers used in these applications is epoxy resin (EP) [ 24 ]. The stator insulating system may involve defects created by combined thermal, mechanical, electrical, and environmental stresses, resulting in gradual deterioration [ 13 , 25 , 26 , 27 ]. In particular, electrical stress can cause PDs in voids and cavities, thereby eroding insulating materials and leading to electrical treeing [ 13 , 25 ].…”

Section: Electric-field Grading In Hv Applicationsmentioning

confidence: 99%

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

et al. 2021

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Applications of polymeric materials in electrical engineering increasingly require improvements in operating voltages, performance, reliability, and size reduction. However, the resulting increase on the electric field in electrical systems can prevent achieving these goals. Polymer composites, functionalized with conductive or semiconductive particles, can allow us to reduce the electric field, thus grading the field within the system. In this paper, a comprehensive review of field-grading materials, their properties, and recent developments and applications is provided to realize high-performance high-voltage engineering applications.

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“…In the last years, the evaluation of the magnitude of aging of large generator insulations has been of huge interest for several researchers [32,33]. Some findings were published in recent years containing the main conclusions of the insulation sate process and aging validation [34,35,36,37,38].…”

Section: Insulation Failure In Power Generatorsmentioning

confidence: 99%

Mica/Epoxy-Composites in the Electrical Industry: Applications, Composites for Insulation, and Investigations on Failure Mechanisms for Prospective Optimizations

et al. 2016

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Abstract:The investigation of mica and mica/epoxy-composites has always been of high importance and has gained increased attention in recent years due to their significant role as insulation material in the electrical industry. Electrical insulation represents a key factor regarding the reliability and lifespan of high voltage rotating machines. As the demand for generating power plants is increasing, rotating machines are of intrinsic importance to the electrical energy supply. Therefore, impeccable functioning is of immense importance for both the producers of high voltage machines as well as the energy suppliers. Thus, cost reduction caused by shorter maintenance times and higher operational lifespan has become the focus of attention. Besides the electrical properties, composites should offer compatible chemical and mechanical, as well as thermal characteristics for their usage in insulating systems. Furthermore, knowledge of several occurring stresses leading to the final breakdown of the whole insulation is required. This review aims to give an overview of the properties of pure components, the composite, and the possible occurring failure mechanisms which can lead to a full understanding of insulation materials for high voltage rotating machines and therefore establish a basis for prospective optimizations.

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Study of epoxy/mica insulation deterioration in generator stator using ultra-wide band partial discharge testing technique

Cited by 8 publications

References 9 publications

Defects and failure types of solid insulation in gas‐insulated switchgear: In situ study and case analysis

Defects and failure types of solid insulation in gas‐insulated switchgear: In situ study and case analysis

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

Mica/Epoxy-Composites in the Electrical Industry: Applications, Composites for Insulation, and Investigations on Failure Mechanisms for Prospective Optimizations

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