特高压半波长输电线路潜供电弧抑制措施研究

Suppression of Secondary Arc for UHV Half-wavelength Transmission Lines

潜供电弧是发展特高压半波长输电技术面临解决的关键问题之一。文中首先采用分段法建立了基于分布参数的潜供电弧数学模型,分析快速接地开关(high speed grounding switch,HSGS)对半波长输电线路潜供电弧的抑制作用;其次,建立半波长输电线路电磁暂态模型,分析快速接地开关限制因素对抑制效果的影响;最后,给出了快速接地开关沿线非均匀配置方法,获得了较优的快速接地开关配置方法。研究表明:HSGS投入时间对潜供电流抑制效果影响不大,为保留足够的时间裕度,应取值150 ms。HSGS接地电阻对潜供电流抑制效果影响较大,应小于1.5Ω。半波长输电线路采用沿线非均匀9组HSGS的配置方法,可有效抑制其潜供电流。

For suppressing secondary arc in half-wavelength AC transmission(HWACT),a mathematical model of secondary arc based on distribution parameters is established by the sectioning method to analyze the suppression effect of high-speed grounding switch(HSGS) on the secondary arc current. And a transient electromagnetic model of HWACT line is built to analyze the influence of the limiting factor of HSGS on the suppression effect. In addition,an optimized scheme of HSGS arrangement is proposed to restrain the secondary arc on HWACT line. The results show that the HSGS reacting time has a little effect on the suppression of the secondary arc current,so the time should be set for 150 ms in order to retain enough time margin. The grounding resistance of HSGS imposes significant influence on the secondary arc current,so its value should be less than 1.5 Ω. HWACT line taking non-uniformly arranged 9 sets of HSGSS configuration can effectively restrain its secondary arc current。