输电线路阻抗参数的实用化计算方法
首发时间:2020-05-21
摘要:基于对输电线路正序及零序阻抗参数计算方法的理论推导,解析出影响输电线路阻抗参数工程计算精度的主要因素。针对输电线路沿线各段土壤电阻率变化较大且不易准确获取的问题,提出根据同一线路走廊内已投运线路实测阻抗参数反推沿线等效电阻率的方法;针对输电线路的局部同塔、局部平行及杆塔多样性特征,提出采用分段计算和杆塔参数简化处理方法;通过研究地线不同接地形式对零序参数的影响,结合实际调研分析,对理论计算公式进行了改进。采用改进后的实用化计算方法,明显提升了输电线路阻抗参数计算的精度和工程实用性。
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Practical calculation method for impedance parameters of transmission lines
Abstract:Based on the theoretical derivation of the calculation method of the positive-sequence and zero-sequence impedance parameters of the transmission line, the main factors that affect the transmission line parameter engineering calculation accuracy are analyzed. For the problem that the soil resistivity along the transmission line is variable and difficult to obtain accurately, a method for inferring the equivalent resistivity along the line based on the measured parameters of the lines in operation is proposed. For the lines partially on the same tower, partially parallel and tower diversity characteristics of the transmission line, the section calculation method and method for simplifying parameters of tower are proposed. By studying the influence of the grounding form on the zero-sequence parameters, combined with actual investigation andPractical calculation method for impedance parameters of transmission lines analysis, the theoretical calculation formula has been improved. The improved practical calculation method has obviously improved the accuracy and engineering practicality of the transmission line impedance parameter calculation.
Keywords: transmission lines Impedance parameter practical calculation
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