交流特高压线路采用HSGS限制潜供电弧的研究

为使自动重合闸在特高压输电线路发生瞬时性故障后能可靠重合,必须对潜供电流和恢复电压值加以限制。结合浙北—上海交流特高压同塔双回输电线路,运用电磁暂态仿真程序ATP/EMTP,考虑了故障一次电弧模型及潜供电弧模型,研究了采用快速接地开关(HSGS)对潜供电弧的抑制效果。研究表明,采用HSGS更适用对于故障点处位于线路两端及中间接地故障的限制,且对单相接地故障的限制效果要优于两相接地故障。对于单相接地故障,两侧HSGS开关动作有0.2~0.3 s时间间隔时,限制效果更佳;HSGS接地电阻取值为0.1~0.5Ω抑制效果较好。

Study on Secondary Arc of UHVAC Transmission Lines using HSGS

In order to ensure the successful reclosure of single-phase automatic reclosure on ultra-high voltage transmission lines, the value of the secondary arc current and the recovery voltage must be limited to a certain value. Taking ZheBei-ShangHai UHV as an example, the extinction method by using high speed grounding switch is investigated with the first arc model and secondary arc model by ATP/EMTP. The result shows that using HSGS is more applicable for the fault in the middle and ends, and restriction has a better effect on single-phase fault than two phase fault. For single fault, the 0. 2 ~ 0. 3 s interval for two side of HSGS and 0. 1 - 0. 5 Ω ground resistance bring a good extinction effect.