带并联电抗器的超高压输电线单相自适应重合闸的研究

针对带或不带并联电抗器的超高压输电线路，详细地分析了单相故障断开相的恢复电压特性；对有并联电抗器补偿的超高压线路，分析了恢复电压中的工频分量以及由各储能元件形成的低频振荡分量，并对恢复电压的拍频现象进行了深入的研究。针对现有自适应重合闸判据判定效果的不足，提出了利用瞬时性故障消失后的拍频特性来判定故障性质的新方法，解决了现有自适应重合闸判据在超高压线路上的应用缺陷，拓宽了单相自适应重合闸的应用范围和前景。经理论分析和EMTP仿真验证表明，该判别方法准确、有效，能够可靠地实现超高压输电线路上的单相自适应重合闸。

THE STUDY ON SINGLE-POLE ADAPTIVE RECLOSURE OF EHV TRANSMISSION LINES WITH THE SHUNT REACTOR

For the transmission lines with or without shunt reactors, this paper analyzes the recovery voltage characters of fault phase in detail. Specially for the transmission line with shunt reactor, the paper analyzes the components of power frequency and low frequency of recovery voltage and researches its beat frequency phenomenon in theory and EMTP simulation. At the same time, in order to make up the defect of previous methods, the paper proposes a new criterion based on the beat frequency characteristics of recovery voltage, which makes adaptive reclosure have more prosperity and less limitation. Theoretical analysis and EMTP simulation tests show that the proposed method is correct and valid to realize single-pole adaptive reclosure of transmission line.