交直流同塔输电线路地面混合场强计算

AC/DC Same Tower Transmission Line Ground Hybrid Field Strength Calculation

给出了一种同塔的单回直流双回交流地面混合场强的计算方法,考虑了塔型、交流导线相序、直流导线正负极起晕差异对地面混合场强的影响因素,并分析了交、直流导线分别对地面场强的影响。结果表明:塔型对地面场强影响较大,交流导线采用倒三角型时计算结果最优;交流导线的相序会影响地面混合场强的大小,但不会影响其分布位置;交流导线和直流导线对地面混合场强大小均起重要作用,但作用范围不同;考虑正负极导线起晕场强差别时,负极性导线下方混合场强较正极性场强明显较大。

Give an approach to calculate one-circuit DC and double-circuit AC ground hybrid field strength in the same tower,considering influence factors of ground hybrid field strength such as tower model,the phase sequence of AC wires,the difference corona onset ground hybrid field strength between the positive and negative pole wires,and analyzes the influence of AC and DC wires separately work on ground field strength.The result shows that the tower model have a great impact on ground field strength,when AC wires adopt inverted triangle,the calculation result is the best;AC wires phase sequences impact on the size of ground field strength,but not affect the distribution location;both AC wires and DC wires play an important role on the size of ground hybrid field strength,but the scope is different;considering the difference corona onset field strength between the positive and negative pole wires,the hybrid field strength underneath the negative pole wires will be significantly larger than the positive pole field strength.