Numerical simulation of the interfacial stress between epoxy resin and metal conductor of power equipment during epoxy curing

Wang, Chuang; Zhou, Gang; Sun, Qing; Chen, Chi; Zhang, Zaiqin; Li, Hui; Peng, Zongren

doi:10.1049/hve2.12206

Cited by 12 publications

(2 citation statements)

References 25 publications

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“…There are many solid–solid interfaces consisting of solid insulating materials in power equipment, and the insulation performance of solid–solid interfaces is higher than those of gas–solid interfaces and liquid–solid interfaces. One of the possible solid–solid interfaces is the epoxy–epoxy interface. , Epoxy resin is an excellent solid insulating material with good molding and processing properties, − and it is widely used in power equipment, such as basin insulators and pillar insulators in dry-type transformers, dry-type bushings, gas insulated switchgear (GIS), and gas insulated transmission line (GIL). − …”

Section: Introductionmentioning

confidence: 99%

Influence of Epoxy Resin Interlayer Interfaces on Electrical Tree Growth and Breakdown Characteristics

Wang,

Li,

Zhou

et al. 2024

Langmuir

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The solid−solid insulation interface structure is a typical interface in extra-high-voltage power equipment, in which the multilayer epoxy resin material is a key component in the insulation structure of the power equipment, and the study of its interface characteristics is the most important. In this paper, epoxy−epoxy cross-linking interface specimens were prepared through experiments, and the degree of cross-linking between the interfaces was analyzed by changing the ratio of the curing agent and adding hydroxyl-terminated liquid nitrile rubber (HTBN) particles; it can be concluded that there exists a weak cross-linking reaction between the interfaces. The electrical tree measurement and alternating current (AC) breakdown test platform were set up, and three different cases of no interface, the electric field direction parallel to the interface, and the electric field direction perpendicular to the interface were tested, through which it was concluded that the existence of the interface inhibited the development of the electrical tree. For the three different cases of AC breakdown tested, it was concluded that the presence of an interface enhances the AC breakdown strength when the electric field direction is parallel to the interface and decreases the AC breakdown strength when the electric field direction is perpendicular to the interface through the interface, affecting the charge transport.

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Section: Introductionmentioning

confidence: 99%

Influence of Epoxy Resin Interlayer Interfaces on Electrical Tree Growth and Breakdown Characteristics

Wang,

Li,

Zhou

et al. 2024

Langmuir

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“…The interface structure formed between two layers of epoxy resin may appear in large and complex epoxy casting parts due to process or design reasons and is generated by multiple castings of epoxy resin. For example, the basin insulators used in gas-insulated switchgears (GIS) may have the interface of laminated epoxy resin between the epoxy resin interface buffer material and the basin epoxy insulation material, as well as the interface formed by multi-layer and multiple castings in large dry-type transformers and dry-type bushings [4][5][6][7][8]. The interlayer interface formed by multi-layer epoxy resin is different from the contact interface formed by general solid insulation materials, and there is a cross-linking and curing process of epoxy resin during its formation.…”

Section: Introductionmentioning

confidence: 99%

Space Charge Characteristics at the Interface of Laminated Epoxy Resin

Zhang

Luo

et al. 2023

Molecules

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In the design and manufacturing of epoxy resin insulation components, complex structures can be achieved through multiple pours, thereby forming the structure of interface of laminated epoxy resin. This type of interface structure is often considered a weak link in performance which can easily accumulate charges and cause electric field distortion. However, research on the interlayer interface of epoxy resin has received little attention. In this study, epoxy samples with and without interlayer interfaces were prepared, and the space charge accumulation characteristics and trap characteristics of the samples were analyzed via pulsed electro-acoustic (PEA) and thermally stimulated depolarization current (TSDC) methods. The experimental results indicate that the Maxwell–Wagner interface polarization model cannot fully explain the charge accumulation at the interface. Due to the influence of the secondary curing, the functional groups in the post-curing epoxy resin can move and react with the partially reacted functional groups in the prefabricated epoxy resin layer, resulting in a weak cross-linking network at the interface. With the increase in temperature, the molecular chain segments in the weak cross-linked region of the interface become more active and introduce deep traps at the interface, thereby exacerbating the accumulation of interface charges. In addition, due to the influence of interface polarization and weak cross-linking, the ability of the interface charges to cause field strength distortions decreases with the increase in applied field strength. This research study can provide a theoretical reference for the interfacial space charge transport characteristics of epoxy-cured cross-linked layers and provide ideas for regulating interfacial cross-linking to suppress interfacial charge accumulation.

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