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High voltage outdoor composite insulators used on transmission lines can be subject to degradation due to electrical discharge activity at the core-sheath interface. A methodology is described to explore the effect of de-bonding or loss of adhesion between the sheath and core in composite insulators. The use of planar geometry materials allows interfacial pressure to be varied and facilitates physical...
Epoxy resin has been widely used in dry-type insulation application such as DC dry-type bushings. In practice, DC dry-type bushings work not only under DC voltage, but also under multiple harmonics with 50Hz fundamental frequency. This study focuses on the effects of space charge behavior of epoxy resin on real voltage of DC dry-type bushings. By using Fourier decomposition, the real voltage of DC...
With the development of the electric power and railway industry, more and more SF6 gas-insulated equipments have been applied. However the greenhouse effect and environmental pollution that caused by SF6 gas has been paid attention in recent years. Therefore looking for the SF6 alternative gas without reducing its insulation performance becomes one of the research hotspots. Epoxy resin has been widely...
This work shows that the discharges pattern and final length, Lf, of creeping discharges depend on the amplitude and polarity of the voltage, the type of gas (mixture) and pressure similarly as in the case of the materials we investigated previously. Lf is longer when the point is positive than when it's negative; this is likely due to the influence of space charge on the electric field. Lf increases...
The vacuum surface flashover characteristic of solid material under steep pulse severely restricts the structure and performance of pulsed-power devices; and with excellent performance in insulation and mechanical strength, epoxy resin has been widely employed in pulse equipment; moreover, the accumulation of surface charge not only enhances the electric field but also affects the movement of the...
Insufficient long term reliability of internal interfaces in polymeric outdoor insulators is considered as a potentially critical factor in the performance of modern outdoor insulation systems. In this study, aiming to elucidate this question, test objects composed of silicone rubber layers moulded onto plates of epoxy resin were tested. The epoxy substrate was incompletely covered by a bonding primer...
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