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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Longitudinal AC breakdown voltage of XLPE-XLPE interfaces considering surface roughness and pressure
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Longitudinal AC breakdown voltage of XLPE-XLPE interfaces considering surface roughness and pressure

机译：考虑表面粗糙度和压力的XLPE-XLPE接口的纵向AC击穿电压

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The interfacial breakdown between two dielectric surfaces has been reported to represent one of the principal causes of failure for power cable joints and connectors; thus, a better understanding of interfacial breakdown mechanisms is vital. The primary purpose of this paper is to investigate the influence of the surface roughness and interfacial pressure on the tangential AC breakdown strength (BDS) of solid-solid interfaces experimentally. The three-dimensional surface texture parameters are utilized to characterize the morphology of the surfaces. Experiments were performed using samples made of cross-linked polyethylene (XLPE) at three different contact pressures. The surface roughness was varied by polishing the surfaces using four different sandpapers of different roughness. Each surface topography was then assessed using a 3-D optical profilometer. Next, the samples were assembled under ambient laboratory conditions. The experimental results showed a good correlation between the tangential BDS and the surface roughness. The results suggested that reducing the surface roughness resulted in decreased mean height of the surface asperities by nearly 97% and increased the real contact area of the interface considerably. As a result, the tangential BDS rose by a factor of 1.85-2.15 with increasing pressure. Likewise, the increased contact pressure yielded augmented tangential BDS values by a factor of 1.4-1.7 following the decrease of the roughness.
机译：据报道，两个电介质表面之间的界面击穿是电力电缆接头和连接器失效的主要原因之一。因此，更好地了解界面破坏机理至关重要。本文的主要目的是通过实验研究表面粗糙度和界面压力对固-固界面切向交流击穿强度（BDS）的影响。三维表面纹理参数用于表征表面的形态。使用交联聚乙烯（XLPE）制成的样品在三种不同的接触压力下进行了实验。通过使用四种不同粗糙度的不同砂纸抛光表面来改变表面粗糙度。然后使用3-D光学轮廓仪评估每个表面的形貌。接下来，在环境实验室条件下组装样品。实验结果表明，切向BDS与表面粗糙度之间具有良好的相关性。结果表明，降低表面粗糙度会导致表面粗糙的平均高度降低近97％，并显着增加界面的实际接触面积。结果，随着压力的增加，切向BDS上升了1.85-2.15倍。同样，随着粗糙度的降低，增加的接触压力使切向BDS值增加了1.4-1.7。

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