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To satisfy the rapid development of energy requirements, power transmission with higher voltage must be adopted. The large improvement in transmission voltage needs more excellent power equipment and better materials to meet its insulation requirement. Polytetrafluoroethylene (PTFE) nozzle used in high voltage circuit breaker faces the issue of breakdown and arc ablation, and thus superior performance...
High-frequency harmonics occur in converter transformers, which may lead to unexpected breakdown of oil impregnated paper insulation under ac-dc combined voltages with high frequencies. Here in this paper, the breakdown characteristics of oil impregnated paper insulation under ac-dc combined voltages in frequencies of 50∼600 Hz were experimentally investigated. After considering the characteristics...
The dc breakdown strength of low density polyethylene (LDPE) decreases with an increase in thickness and temperature of the sample. The breakdown strength is influenced by the charge transport and electric field distortion, and is also related to the molecular chain displacement and fracture. This paper investigates mutual relations among the charge transport, molecular chain displacement, and thickness...
Compared with the conventional microcomposites, incorporating nanoparticles into polymeric matrix can better improve breakdown performance. Much works have been done to investigate the electrical properties of nanodielectrics since the first experimental results published. It is acknowledged that the interface between nanoparticle and polymeric matrix play a dominant role in the electric properties...
It is of great importance to assess the reliability of on-site testing for extruded insulation cables. In the present work, the effect of the applied field frequency on the breakdown performance of cross-linked polyethylene (XLPE) insulation was investigated. An inserted needle was embedded into a 10 kV commercial XLPE cable along the radial direction to simulate the real defects. The shape of the...
In the paper, the influences of trap levels on both DC and impulse surface flashover voltage of semi-crystalline cross-linked polyethylene (XLPE) in vacuum were investigated. With different heat-treatment, the electrical properties and trap distribution of samples were studied. It is proposed that the trap levels are changed by heat treatment leading to the improvement of surface flashover properties...
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