CAJ | 학술논문

同塔并架多回线路采用不换位架设导致电气参数三相不对称,使得潜供电弧难以自熄,在超高压输电线路甚至出现了瞬时故障重合闸重合不成功的情况.针对这个问题,建立了500 kV 同塔双回不换位线路潜供电流和恢复电压的计算模型,并应用 PSCAD/EMTDC 软件,从相序排列方式、故障相别、线路长度三个方面对其进行了仿真分析.根据仿真结果,给出了500 kV 同塔双回不换位线路不同线路长度对应的单相重合闸推荐时间.建议根据线路长度合理整定单相重合闸时间,从而提高重合成功率.
동탑병가다회선로채용불환위가설도치전기삼수삼상불대칭,사득잠공전호난이자식,재초고압수전선로심지출현료순시고장중합갑중합불성공적정황.침대저개문제,건립료500 kV 동탑쌍회불환위선로잠공전류화회복전압적계산모형,병응용 PSCAD/EMTDC 연건,종상서배렬방식、고장상별、선로장도삼개방면대기진행료방진분석.근거방진결과,급출료500 kV 동탑쌍회불환위선로불동선로장도대응적단상중합갑추천시간.건의근거선로장도합리정정단상중합갑시간,종이제고중합성공솔.
@@@@The asymmetry of multi-circuit transmission line parameters caused by un-transposition makes the secondary arc current difficult to extinguish. With the improvement of voltage level and line length, the reclosing failure has taken place in some of high voltage multi-circuit transmission line while the transient fault occurs. To solve this problem, the formulas of calculating the secondary arc current and recovery voltage on double-circuit lines are presented. Using PSCAD/EMTDC, the secondary arc current and recovery voltage of a 500 kV double circuit lines without transposition are calculated in different phase sequence arrangement, different fault phases and different line length. According to the simulation results, a single-phase reclosing time’s standard is advised. To ensure the success of reclosing and improve the reliability of power supply, the single-phase reclosing time should be extended properly.