35kV典型电缆故障修复方法研究

发布时间：2018-12-12 09:05

【摘要】：随着社会的发展和城市化率的不断提高,市区输电线路广泛的以电缆的方式敷设于地下,可以节省地面空间而且更加安全,但是一旦电缆线路发生故障,电缆故障的测寻和修复都十分困难。目前没有任何一种监测方法能完全避免电缆缺陷发展为电缆故障,外力破坏电缆的事故也无法杜绝。所以,一旦电缆发生故障,如何快速修复电缆,节约修复材料、费用成为关键问题。按照现有的技术,电缆发生单相故障,修复电缆时,基于电缆三相绝缘完整性的考虑,要将故障部分锯掉,重新更换一段电缆,再重新制作两组三相的电缆接头。如果电缆只发生单相故障,如果完全更换,这样不仅耗费材料较多,而且安装电缆接头、开挖接头坑需要更多的人力成本,时间成本。开展电缆单相故障修复法的研究,使电缆在绝缘、电场、密封性等环节恢复到可以运行的状态,将大幅度降低电缆的修复成本,节省材料,减少电缆的修复时间。本文对电缆单相故障修复的工艺提出了新思路和新办法。本文通过介绍国内外电缆在故障前后进行修复的方法,对比其中的不足和局限性,对电缆故障后修复方法进行探讨。首先,从35kV电缆的结构及附件类型入手,对比分析了常用电缆附件优缺点及对环境的不同适应性、常见的故障类型及引起故障的原因,初步确定了保证电缆附件安装质量的关键因素及可能威胁电缆安全运行的隐患和缺陷。最后,将以上理论作为基础,综合目前使用的附件安装技术及材料,运用本文提出的新方法,以2013年某35kV电缆线路终端故障修复现场操作工艺为蓝本,提炼出适用于中压XLPE电缆单相故障修复法,并应用到现场实际中,修复后电缆的安全可靠运行证明了此修复法的有效性和可推广性。通过实际分析表明此方法对电缆单相故障进行修复可以大幅提高抢修速度、减少停电时间、材料消耗和人力成本,达到“一箭多雕”的效果。
[Abstract]:With the development of society and the increasing rate of urbanization, transmission lines in urban areas are laid underground by cable widely, which can save ground space and be safer, but once the cable line breaks down, The detection and repair of cable faults are very difficult. At present, there is no monitoring method that can completely avoid the cable defect from developing into cable fault, and the accident of external force breaking the cable can not be eliminated. Therefore, once the cable fails, how to quickly repair the cable, saving repair materials, cost becomes a key issue. According to the existing technology, the cable has a single phase fault. When repairing the cable, based on the consideration of the cable three-phase insulation integrity, the fault part should be sawed off, a new section of cable should be replaced, and two sets of three-phase cable connectors should be remade. If the cable is only single phase fault, if the cable is completely replaced, it will not only consume more materials, but also install the cable joint, and excavate the joint pit will require more labor cost and time cost. The research of single-phase fault repair method of cable can restore the cable to the running condition in the links of insulation, electric field and sealing, which will greatly reduce the repair cost of cable, save the material and reduce the repair time of cable. In this paper, a new idea and method of cable single-phase fault repair are put forward. This paper introduces the methods of cable repair before and after fault at home and abroad, compares its shortcomings and limitations, and probes into the methods of repairing cable after fault. First of all, starting with the structure and accessory type of 35kV cable, the advantages and disadvantages of common cable accessories, the different adaptability to environment, the common fault types and the causes of failure are compared and analyzed. The key factors to ensure the installation quality of cable accessories and the hidden dangers and defects that may threaten the safe operation of cables are preliminarily determined. Finally, taking the above theory as the basis, synthesizing the attachment installation technology and materials used at present, using the new method proposed in this paper, taking the on-site operation technology of a 35kV cable line terminal fault repair in 2013 as the blueprint, The single-phase fault repair method for medium-voltage XLPE cable is refined and applied to the field practice. The safe and reliable operation of the repaired cable proves the effectiveness and extensibility of the repair method. Through practical analysis, it is shown that this method can greatly improve the repair speed, reduce the time of power outage, material consumption and labor cost, and achieve the effect of "one arrow and more carving".
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM75

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