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Medium voltage single core cable armor grounding issues and solutions

机译：中电压单核电缆装甲接地和解决方案

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摘要

In medium voltage installations, grounding grid is often considered insufficient to provide a reliable fault return path. To create better continuity of the grounding system and better conditions for operation of protective relays, it is common practice to ground medium voltage cable armor at both ends, or to use a separate grounding conductor in parallel with the main power circuit. When single core cable armor is used as grounding medium, the point and the method of armor grounding becomes critical. If single core cable armor is grounded at both ends through cable glands, continuous high circulating armor currents may create high temperatures at armor termination points. Standards do not require cable glands to be rated for continuous currents, and therefore, it is important to eliminate high continuous armor currents from the glands. This paper illustrates possible issues in armor grounding in single core medium voltage cables with the help of relevant data, measurements and thermal images. The paper discusses methods of single core medium voltage cable armor grounding, their advantages and disadvantages and solutions to avoid possible issues.
机译：在中压装置中，接地网格通常被认为不足以提供可靠的故障返回路径。为了创造接地系统的更好连续性和保护继电器的操作的更好条件，常见的做法是在两端接地介质电压线铠装，或者与主电源电路并联使用单独的接地导体。当单芯电缆装甲用作接地介质时，铠装接地的点和方法变得至关重要。如果通过电缆腺体两端接地，则连续高循环铠装电流可以在装甲终止点处产生高温。标准不需要电缆腺来额定电流，因此，重要的是消除从腺体中的高连续甲型电流。本文在相关数据，测量和热图像的帮助下说明了在单核介质电压电缆中的装甲接地的可能问题。本文讨论了单核介质电压电缆接地的方法，其优点和缺点和解决方案，以避免可能的问题。

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