超高压输电线路故障测距研究

发布时间：2018-05-01 00:10

本文选题：故障测距 + 超高压输电线路　；参考：《山东大学》2015年硕士论文

【摘要】：500kV及以上电压等级的超高压线路是国内输电系统的骨干网架,其重要作用不言而喻。当前,超高压已经输电线路主网架,在传输电力方面起到了重要的支撑作用。伴随着特高压交直流的密集投运,保障输电线路可靠性成为了重要研究课题。超高压输电线路具有它独特的特点,一是输电线路长度比较大,一般在几十公里以上,有的甚至可以达到几百公里,甚至上千公里,复杂的野外环境,致使影响线路正常运行的因素比较多,因此发生故障的几率也就比较大。二是输电线路的故障基本为瞬时故障,造成故障的原因90%以上是闪络,这种故障特征不明显,并且由于输电线路距离地面30米以上,对故障点的查找带来了极大的不便。三是超高压输电线路负荷较大,最大限度地减少停电时间,对于保障电网安全,维护社会稳定有着积极的促进作用。基于以上三点,对精准故障定位技术的需求越来越迫切。作者在查阅大量的相关专题文献的基础上,对现有的种种阻抗测距算法和行波测距算法的原理进行了详细的分析。对当前的故障测距有了比较深入的思考,对各类故障测距方法进行了全方位的比较,为下一步开展超高压输电线路的故障测距研究提供了坚实的理论基础。同时,提取作者工作单位的超高压输电线路故障信息进行实际检验,从现场实际角度给予了客观的评价。最后,对输电线路故障测距的研究方向进行了展望。
[Abstract]:EHV line with 500kV and above voltage level is the backbone of domestic transmission system, and its important role is self-evident. At present, UHV has been the main transmission line grid, which plays an important supporting role in the transmission of power. With the intensive operation of UHV AC and DC, the reliability of transmission lines has become an important research topic. The UHV transmission line has its unique characteristics. One is that the length of the transmission line is relatively large, generally more than a few dozen kilometers, some can even reach several hundred kilometers, or even thousands of kilometers, complex field environment. There are many factors that affect the normal operation of the line, so the probability of failure is higher. The second is that the fault of transmission line is basically instantaneous fault, the cause of fault is flashover more than 90%, this fault characteristic is not obvious, and because the transmission line is more than 30 meters from the ground, it brings great inconvenience to finding fault point. Thirdly, the UHV transmission line has a large load and minimizes the blackout time, which plays an active role in ensuring the security of power grid and maintaining social stability. Based on the above three points, the need for accurate fault location technology is becoming more and more urgent. On the basis of consulting a large number of related literature, the author makes a detailed analysis of the principles of various impedance ranging algorithms and traveling wave ranging algorithms. The present fault location has a more in-depth thinking, and all kinds of fault location methods are compared, which provides a solid theoretical basis for the next research on the fault location of EHV transmission lines. At the same time, the fault information of UHV transmission line is extracted from the author's work unit for practical inspection, and the objective evaluation is given from the point of view of field practice. Finally, the research direction of transmission line fault location is prospected.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM75

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