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Importance of materials in composite conductors

机译：材料在复合导线中的重要性

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Composite conductors offer exceptional sag-reduction benefits and increased capacity when compared to conventional conductors. They are therefore increasingly considered for overhead transmission line thermal upgrades. There are two types of fiber composites used in overhead conductors: polymer matrix composites (PMCs) and metal matrix composites (MMCs). PMCs are limited by their polymer matrix which can age and degrade under environmental and high temperature conditions. Two predominant polymer aging mechanisms are thermal oxidation near the glass transition temperature, and water absorption in hot-wet environments. Both aging mechanisms are specific to PMCs and can severely deteriorate the shear, bend and compressive strengths. Poor bend and shear strength can lead to failure when the PMC is subjected to off-axis loading such as during installation and in connectors. MMCs used in transmission lines consist of fibers embedded in an aluminum matrix. They are generally heavier and have a slightly lower sag performance than PMCs. The shear and compression properties in MMC conductors are governed by the aluminum matrix. The aluminum matrix strength is stable under aging at high temperature and is not affected by moisture. MMCs retain good tensile, bending, and compressive strengths after environmental exposure at high temperatures.
机译：与传统导体相比，复合导体提供出色的落下效率和增加的容量。因此，它们越来越多地考虑用于架空传输线热升级。架空导体中使用两种类型的纤维复合材料：聚合物基质复合材料（PMC）和金属基质复合材料（MMC）。 PMC受其聚合物基质的限制，其可在环境和高温条件下年龄和降解。两种主要聚合物老化机构是玻璃化转变温度附近的热氧化，以及热潮汐环境中的吸水。两种老化机制都是特定于PMC的，并且可以严重劣化剪切，弯曲和抗压强度。当PMC在安装和连接器期间，PMC偏离轴载荷时，弯曲和剪切强度差可能导致失效。用于传输线的MMC由嵌入在铝基矩阵中的纤维组成。它们通常比PMC更重，并且具有略微较低的下垂性能。 MMC导体中的剪切和压缩性能由铝基矩阵管辖。铝基基质强度在高温下老化稳定，不受水分的影响。 MMC在高温下的环境暴露后保持良好的拉伸，弯曲和抗压强度。

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