新型10kV架空线路并联间隙防雷装置的研制

发布时间：2019-02-16 06:40

【摘要】：在电力系统中,输电线路是最为重要的设备之一。输电线路往往涉及长度大,所处的环境较为复杂问题,其运行的可靠程度直接影响电网安全运行。而绝缘子串是架空输电线路中的重要组成部分,在高压输电线路中起支撑导线并使之与杆塔绝缘的作用。我国现有并联间隙大部分用于35kV、110kV、220kV电压等级的架空线路上,但现有10kV架空线路并联间隙的研制尚为空白。本文以10kV架空线路的并联间隙为研制对象,针对现有并联间隙耐电弧烧蚀能力较差,导致其使用寿命较低的问题展开研究工作。本文拟寻求良好的耐电弧烧蚀性能的材料,通过提高并联防雷间隙的使用寿命,降低线路运行维护费用,来实现架空输电线路的安全运行。本文主要有以下内容:1、对并联间隙的材质进行研制。将耐烧蚀铜钨合金替代普通碳素钢作为并联间隙上、下电极材质。通过短路电流、真空放电、中性盐雾试验和盐水浸泡试验分别进行验证,得出结论是耐烧蚀铜钨合金的耐电弧侵蚀、耐腐蚀能力均大大优于普通碳素钢材。2、对并联间隙的结构进行设计,并加工成样品。3、对并联间隙进行电气性能研究。通过50%雷电放电电压试验、工频电压试验和工频大电流燃弧试验,检验新型并联间隙的防雷性能。4、对本文研制的新型并联间隙进行应用效果分析。该装置现在泉州市10kV龙通线架空线路上得到应用。经过1年雷雨季节的考验,己有多次动作记录,实践证明该装置的防雷效果良好。最后,对本文所做的工作进行了总结。
[Abstract]:Transmission line is one of the most important equipments in power system. Transmission lines often involve large length and complex environment. The reliability of transmission lines directly affects the safe operation of power grid. The insulator string is an important part of overhead transmission line, which plays the role of supporting the conductor and insulating it from the tower in the high voltage transmission line. Most of the existing parallel gaps in China are used on overhead lines with 35 kV / 110kV / 220kV voltage grade, but the development of the parallel gap of the existing 10kV overhead lines is still blank. In this paper, the parallel gap of 10kV overhead line is taken as the research object, aiming at the problem of poor arc ablation resistance of the existing parallel gap, which leads to its low service life. In this paper, we are looking for materials with good arc ablation resistance to achieve the safe operation of overhead transmission lines by increasing the service life of the parallel lightning gap and reducing the operating and maintenance costs of the lines. The main contents of this paper are as follows: 1. The material of parallel clearance is developed. Ablation-resistant copper-tungsten alloy was replaced by ordinary carbon steel as parallel gap and lower electrode material. Through short circuit current, vacuum discharge, neutral salt spray test and brine immersion test, it is concluded that the arc corrosion resistance of ablative copper tungsten alloy is much better than that of common carbon steel. The structure of parallel gap is designed and processed into sample. 3. Electrical performance of parallel gap is studied. Through 50% lightning discharge voltage test, power frequency voltage test and power frequency large current arc burning test, the lightning protection performance of the new parallel gap is tested. 4. The application effect of the new parallel gap developed in this paper is analyzed. The device is now used on the overhead line of 10kV Longtong Line in Quanzhou City. After one year thunderstorm season test, there have been many action records, the practice proves that the lightning protection effect of the device is good. Finally, the work done in this paper is summarized.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM862

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