同塔双回线单线故障测距与选相方法研究

发布时间：2018-11-26 16:56

【摘要】：同塔双回输电线路除单回线故障外,还存在跨线故障,共计120种故障类型,其中,跨线故障有98种,单回线故障有22种。虽然跨线故障在故障类型中占有压倒性的优势,但统计资料表明,单回线发生故障的几率很大,而跨线故障仅占同塔双回线总故障的20%-30%。因此,对于同塔双回输电线路,在考虑跨线故障的同时,也要考虑同塔双回线的单线故障问题。分析同塔双回输电线路的特殊型和复杂性,将三相系统的解耦矩阵推广到同塔双回输电线路中,建立同塔双回输电线路的解耦矩阵。分析同塔双回输电线路结构特殊,是一个环状网络,根据这一特点,分别从电压行波和时域测距方法入手,提出适用于同塔双回线单线故障的电压行波测距方法和时域故障测距方法。利用最小包围圆算法将小波能量和分形盒维数结合起来,可以克服分别采用两者进行故障选相方法的缺点。
[Abstract]:In addition to single circuit fault, there are 120 kinds of cross line faults in the same tower double circuit transmission line. Among them, there are 98 cross line faults and 22 single circuit faults. Although the cross-line fault has an overwhelming advantage in the fault type, the statistical data show that the probability of single circuit line fault is very large, while the cross-line fault only accounts for 20-30 of the total fault of the same tower double-circuit line. Therefore, for the same tower double circuit transmission line, the single line fault of the same tower double circuit line should be considered as well as the cross line fault. The special type and complexity of the double circuit transmission line with the same tower are analyzed. The decoupling matrix of the three phase system is extended to the double circuit transmission line of the same tower, and the decoupling matrix of the double circuit transmission line of the same tower is established. This paper analyzes the special structure of double circuit transmission line of the same tower, which is a ring network. According to this characteristic, the traveling voltage wave and the time domain ranging method are introduced respectively. A voltage traveling wave location method and a time domain fault location method are proposed for single line fault of double circuit line of the same tower. Combining wavelet energy and fractal box dimension with the minimum bounding circle algorithm, the fault phase selection method can be overcome.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM75

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