Abstract
High-voltage direct-current composite insulators are faced with various challenges during operation, such as creeping discharge, umbrella skirt damage, abnormal heating and insulator breakage. Among them, the aging of the interface between the core rod and the sheath is one of the important causes of composite insulator failure. In order to improve the electrical resistance of the composite insulator interface, this study uses plasma etching to modify the surface of the glass-fiber-reinforced epoxy resin plastic to prepare the high-voltage direct-current composite insulator core rod–sheath samples. By analyzing the surface morphology of the epoxy resin, static contact angle and surface charge transfer characteristics, the control mechanism of the plasma etching treatment on the interface bonding performance and leakage current of composite insulator core rod–sheath samples were studied. The results show that proper etching time treatment can improve the trap energy level distribution and microstructure of epoxy resin and increase the discharge voltage along the surface; chemical bonding plasma etching can improve the interfacial bonding performance of core rod–sheath samples sheaths, reduce the leakage current of composite insulator core rod–sheath samples sheath specimens and improve their interfacial performance.
Highlights
High-voltage DC composite insulators are mainly composed of internal glass fiber reinforced epoxy resin core bar and external high-temperature vulcanized silicone rubber (SIR) skirt sheath [1,2], the integrated performance of the core bar and sheath interface is directly related to the operational reliability of composite insulators [3,4,5]
Using ME-3A multi-functional magnetically enhanced reactiveion etching machine (Institute of Microelectronics of the Chinese Academy, Beijing, China), plasma etching of epoxy resin samples and core rod–sheath samples were carried out for 5 min and 30 min, respectively, using CF4 as working gas
In order to improve the interface performance of the composite insulator core rod–sheath samples sheath, this paper adopts plasma etching to modify the surface of the epoxy resin core rod
Summary
High-voltage DC composite insulators are mainly composed of internal glass fiber reinforced epoxy resin core bar and external high-temperature vulcanized silicone rubber (SIR) skirt sheath [1,2], the integrated performance of the core bar and sheath interface is directly related to the operational reliability of composite insulators [3,4,5]. Zhang Cheng et al used atmospheric pressure dielectric blocking discharge and plasma-enhanced chemical vapor deposition methods to modify the epoxy resin surface, which promoted the material surface entrapment charge depression and reduced charge accumulation [16,17]. These studies mainly aim at improving the surface insulation of a single polymer material, but few studies have been conducted on the interface properties of different polymer materials. The effects of different etching times and surface roughness of the epoxy resin on the binding properties of the composite insulator interface were investigated
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