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Propagation of intersheath modes on underground cables

机译：地下电缆在鞘间传播

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Wave propagation and transients associated to intersheath modes on normal-bonded and cross-bonded cables are the main topic of this paper. Intersheath mode characteristics are not easily identified in practice using the standard circuits for field testing of normal-bonded cables because the source grounding introduces several overlapping modal components. The differences between cross-bonded and normal-bonded cables are highlighted based on the propagation characteristics of the two systems. In particular, inter-core mode propagation is substantially affected by the cross-bonding of sheaths. Discrete and homogeneous models of a cross-bonded cable are compared in a time-domain simulation. The accuracy of the homogeneous model improves when the number of sheath grounding points is high. It is clearly shown that even though intersheath modes cannot be excited in a cross-bonded cable they can still be induced by the currents in the core conductors and have an impact on the cable's transient response. (C) 2016 Elsevier B.V. All rights reserved.
机译：法向粘结和交叉粘结电缆上与鞘间模式相关的波传播和瞬变是本文的主题。实际上，使用标准电路对普通粘结电缆进行现场测试时，鞘间模式特性很难识别，因为源极接地会引入多个重叠的模态分量。基于两个系统的传播特性，突出显示了交叉粘结电缆和法向粘结电缆之间的差异。特别地，芯间模式传播基本上受到护套的交叉粘合的影响。在时域仿真中比较了交叉粘结电缆的离散模型和同类模型。护套接地点数量多时，均质模型的精度会提高。清楚地表明，即使在交叉连接的电缆中不能激励鞘间模式，它们仍可能被芯导体中的电流所感应，并影响电缆的瞬态响应。 （C）2016 Elsevier B.V.保留所有权利。

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