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首页> 外文会议>2015 IEEE IAS Joint Industrial and Commercial Power Systems/ Petroleum and Chemical Industry Conference >Medium voltage single core cable armor grounding issues and solutions
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Medium voltage single core cable armor grounding issues and solutions

机译：中压单芯电缆铠装接地问题及解决方案

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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：在中压设备中，通常认为接地网不足以提供可靠的故障返回路径。为了使接地系统具有更好的连续性，并为保护继电器的运行创造更好的条件，通常的做法是在两端将中压电缆铠装接地，或者使用与主电源电路并联的单独接地导体。当单芯电缆铠装用作接地介质时，铠装接地的要点和方法变得至关重要。如果单芯电缆铠装通过电缆密封套的两端接地，则持续的高循环铠装电流可能会在铠装端接点产生高温。标准不要求电缆密封套具有连续电流额定值，因此，重要的是要消除密封套的高连续铠装电流。本文借助相关数据，测量值和热图像说明了单芯中压电缆的铠装接地中可能存在的问题。本文讨论了单芯中压电缆铠装接地方法，其优缺点和避免可能出现问题的解决方案。

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