同塔双回特高压线路潜供电流和恢复电压的限制
Restriction on Secondary Arc Current on Ultra-high Voltage AC Double Circuit Transmission Lines on the Same Tower
-
摘要: 为保证同塔双回特高压线路重合闸成功率,必须对其潜供电流和恢复电压进行限制。针对特高压线路广泛采用的高抗中性点加小电抗限制措施,分析了同塔双回线路潜供电流的产生机理,研究了不同换位方式对潜供电流限制效果的影响,并提出了中性点小电抗阻抗值的直接计算公式。结果表明,综合考虑潜供电流限制效果和实现可能性,逆相序反向换位最佳。实际算例验证了所提出的小电抗计算公式的准确性,能够简单、快速地计算出双回线路小电抗阻抗值。Abstract: In order to improve the success rate of auto-reclosing on the double circuit ultra-high voltage（UHV） transmission lines,the secondary arc must be restricted to a low level.In light of the neutral reactor widely used in UHV transmission lines,the mechanism of secondary arc generation is studied and the transposition effect on the restriction of secondary arc current is discussed.And the formula is given that directly calculates the impedance of the neutral reactor.Results obtained show that,in consideration of the restriction on secondary arc and the difficulty in its implementation,the reverse phase sequence transposition is best.The example shows that the formula proposed is feasible and accurate in rapidly computing the neutral reactor of double circuit transmission lines.
下载:
