摘要
研究了强不对称的互感线路其各序耦合对线路不平衡的影响。针对实际线路情况,在分析输电线路序阻抗理论的基础上,建立了输电线路一般的数学模型,推导了更加切合实际的计算公式;结合线路电流不平衡度对线路不平衡性进行了分析,首次给出了各序阻抗的实际测量方法和数据处理方法。应用实例的计算和测量结果表明,垂直型杆塔和斜三角杆塔,其输电线路存在不平衡情况:单回最大负序不平衡可达9.6%;双回路导线排列顺序对线路电流不平衡度影响比较大;逆序排列可以减小线路电流不平衡度。因此在强不对称的互感线路的分析计算中,其各序耦合是不可忽略的。
The influence of sequence mutual inductance to the circuit imbalance of asymmetry transmission line is studied. The model of transmission line is built and calculation formulas for sequence mutual impedance are deduced based on the theory of sequence mutual impedance. The imbalance of transmission line is analyzed based on the circuit imbalance and the measuring method for sequence mutual impedance is presented for the first time. The calculation and measurement results of practical examples show that imbalances exist in the transmission line of vertical tower and oblique triangular tower. The max negative sequence imbalance value of single line may reach 9.6%. The order of couple transmission line has great influence on the degree of current imbalance, and the reversed order can reduce the degree of current imbalance. The sequence mutual inductance can＇ t be ignored in the analysis and calculation of asymmetry transmission line with mutual inductance.
出处
《广西电力》
2009年第6期7-13,共7页
Guangxi Electric Power
基金
国家自然科学基金项目(50477018)
关键词
输电线路
互感
电流不平衡度
负序
零序
transmission line, mutual inductance, current unbalanced degree, negative sequence, zero sequence
