超高压同杆双回输电线路中熄灭潜供电弧的研究

为了使单相自动重合闸在超高压同杆双回线路中可靠重合,必须限制潜供电流和恢复电压的大小。针对超高压长线路中普遍装设有并联电抗器,可采用在并联电抗器中性点加小电抗熄灭潜供电弧的特点,分析计算了中性点小电抗的不同接线方法和取值对潜供电流和恢复电压的影响。计算表明,通过合理地选择中性点小电抗可将潜供电流和恢复电压限制到要求值以下,并且文中所述的第2种接线方法对于同杆双回线限制潜供电弧具有较好的补偿效果。

Study of the Secondary Arc Extinction at EHV Double Circuit Transmission Lines

In order to ensure the successful single pole autoreclosure on the double circuit transmission lines, the secondary arc must be limited to a certain value. For the shunt reactor compensation is widely used in the EHV transmission line, the fourth reactor compensation scheme can be used for the extinction of the secondary arc. This paper discusses the effect of different connection styles and the values of the fourth reactor on the secondary arc current and the recovery voltage of a double-circuit transmission lines. The calculation results show that the secondary arc current and the recovery voltage can be limited to required values by choosing appropriate value of the fourth reactor. Furthermore, better results on double-circuit transmission lines can be obtained by using the second compensation method.