深圳高压电缆护套环流超标原因分析及解决措施研究

发布时间：2017-12-26 22:26

本文关键词：深圳高压电缆护套环流超标原因分析及解决措施研究　出处：《华南理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：电力电缆由于具有传输电能稳定、供电可靠性高、受气候和环境因素影响较小、占地少等优点,随着城市经济的高速发展,在城市电网建设的过程中,其运用已越来越广泛。截至2015年11月,深圳110k V及以上电缆回长已接近800km,因受外力破坏、老化、施工或检修不当等原因,造成护层接地环流超标的高压电缆线路数逐年上升,2014-2015年,检测发现环流超标线路近40回,运维形势十分严峻。因此,研究深圳高压电缆护套环流超标原因、分析影响因素,并提出有效的解决措施,确保电缆安全稳定运行,已变得愈来愈为迫切。本文通过阐述单芯电缆金属护套感应电压及电流的计算理论,建立单芯电缆护套环流计算模型,推导出护套环流计算方法,并结合实际工程进行计算,分析电缆金属护套环流的影响因素;同时分析实际运行中常见的环流超标缺陷案例,总结缺陷特征。本文分析得出,影响护套环流超标的原因主要为交叉互联分段不均、交叉互联连板接错、外护套破损。提出了对新建线路,应尽量采用“品”字形布置方式,电缆分段尽量均匀,对敷设工况变化较多时,应结合护套环流及载流量合理选择相间距及分段;对在运行线路,可通过外护套故障查找及修复、护套接地前串联小电阻或补偿电感(电抗器)来控制环流,实用效果较好。
[Abstract]:Because of the advantages of transmission power stability, high power supply reliability, less impact on climate and environmental factors and less land occupation, power cable has been widely used in the process of urban power network construction along with the rapid development of urban economy. As of November 2015, Shenzhen 110k V and above the cable length is close to 800km, due to external damage, aging, improper construction or maintenance and other reasons, resulting in high voltage cable sheath grounding current exceed the standard number increased year by year, 2014-2015, detected nearly 40 to exceed the standard circulation line operation, the situation is very serious. Therefore, it is urgent to study the cause of the high voltage cable sheath circulating over standard in Shenzhen, analyze the influencing factors, and put forward effective solutions to ensure the safe and stable operation of cables. This paper describes the calculation theory of the single core cable metal sheath induction voltage and current, the establishment of a single core cable sheath current calculation model and calculation method are derived and calculated with the sheath current, practical engineering, analysis of influencing factors of cable sheath circulation; at the same time, analyze the actual operation of the common circulation exceed the standard defect cases, summarize the characteristics of defects. In this paper, it is concluded that the main reasons that affect the circumfluence of the sheath are cross interconnected segment uneven, cross interconnected continuous plate connection and outer sheath breakage. Put forward the new line, should try to use "goods" - shaped layout, cable laying on the piecewise uniform, conditions change more, should be combined with the sheath current and load selection phase spacing and segmentation; on line running through the outer sheath, troubleshooting and repair, sheath grounding before a small series resistance or compensating inductance (reactor) to control the circulation, the practical effect is better.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM75

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