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Silicone rubber (SiR) has been an important material in cable accessories which are connected to the superconducting power system. Electrical tree is a serious electrical aging to SiR insulation and it will cause breakdown when reaches the ground. Addition of nanoparticles into SiR will improve the insulating properties compared with undoped material. However, the effect of temperature below 0 °C...
Polyimide film has been used as an insulation material in the excitation winding of the high temperature superconducting motors. The existence of surface charge has a great influence on the breakdown characteristic. Direct fluorination is an effective method of polymers surface modification which can improve the electrical properties of original material. Therefore, it is necessary that the surface...
Ethylene-propylene-diene terpolymer (EPDM) has been an important material in high voltage cable accessories which are connected to the superconducting power system. The dielectric properties are a great concern for the cable accessories. Doping of carbon black (CB) nanoparticles into EPDM has the effects of improving the insulating properties compared with undoped material. However, the effect of...
Polyethylene (PE) is widely used as insulating materials in superconducting motors because of its excellent insulation properties. Tracking failure is a typical thermal breakdown which is caused by thermal accumulation on polymer surface. In this paper, the tracking failure behaviors of PE/BN (boron nitride) composites under low temperature were studied to clarify the effects of low temperature and...
Epoxy resin as an insulating material is widely used in superconducting motors because of its excellent insulation properties under low temperature. However, epoxy has a relatively low thermal conductivity so it may be damaged by thermal breakdown. Tracking failure is a kind of thermal breakdown happened on polymer surface. In this paper, the tracking failure behaviors of Epoxy/BN (boron nitride)...
This paper presents the study of the relationship between magnetic field (MF) and growth mechanism of electrical tree in silicone rubber (SiR) under low temperature. Needle-plate electrode was employed in this paper to generate electrical tree, and silver needle was employed to avoid stress generated by the MF. Samples were applied pulse voltage of +12 kV. 0 and 400 mT magnetic field density was applied,...
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