Abstract
Epoxy resin samples were processed by one direction and multi-directions polishing methods in this research. The contact angles of the samples, the AC/DC flashover voltage in C4F7N/CO2 gas mixtures and the charge dissipation rate of the polished samples were measured. The results show that the contact angle of the polished epoxy resin sample increases. In the gas mixtures, the surface roughness modification of the epoxy resin under different voltage types is proposed. According to the charge dissipation rate, the development mechanism of creeping flashovers under different voltage is revealed. Different dissipative properties ultimately enhance the creeping discharge voltage of the samples by suppressing electron secondary electron emission. This paper offers a basis for insulation design in the C4F7N/CO2 gas mixture.
Highlights
As an produced insulating material with good physical, mechanical, and dielectric properties and easy production, epoxy resin has been widely used in the electrical insulation field since the late 1940s.1 the functional components such as insulation and support in electrical equipment are fabricated using epoxy resin.2,3 With increasing demand for energy and the uneven distribution of energy worldwide, the development of high-voltage and large-capacity electrical equipment such as GIL has become an irreversible trend, and insulation material flashover of electrical equipment is a key issue that limits this development
According to the flashover voltage variation and charge dissipation characteristics, together with Fig. 12, it is considered that the influence of the roughness of C4F7N/CO2 gas mixtures on the insulation properties of epoxy resin samples is mainly restricted by the following aspects
Epoxy resin samples were polished in one direction or in multiple directions, and the AC and DC flashover voltages were tested in gas mixtures at 0.1 MPa C4F7N/CO2
Summary
As an produced insulating material with good physical, mechanical, and dielectric properties and easy production, epoxy resin has been widely used in the electrical insulation field since the late 1940s.1 the functional components such as insulation and support in electrical equipment are fabricated using epoxy resin. With increasing demand for energy and the uneven distribution of energy worldwide, the development of high-voltage and large-capacity electrical equipment such as GIL has become an irreversible trend, and insulation material flashover of electrical equipment is a key issue that limits this development. Study of the gas-solid interface charge characteristics and insulation properties of epoxy resins is of great significance and can help to improve the physical chemical and electrical properties of insulating materials as well as the reliability and stability of transmission equipment and transmission networks.. The secondary electron avalanche theory states that the key to creeping flashover is the release of gas adsorbed on the surface of the insulating material, especially as an explanation for the phenomenon of creeping discharge of an insulator in a vacuum environment under the action of pulse voltage The theory of electron-triggered polarization relaxation considers that creeping flashover is caused by electric charge trapped in the dielectric medium and is suitable for explaining the phenomenon of creeping discharge of insulator under the action of steady-state voltage. The charge dissipation rates are measured and the relationship between charge dissipation characteristics and flashover voltage is investigated
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