电网技术
電網技術
전망기술
POWER SYSTEM TECHNOLOGY
2012年
3期
81-87
,共7页
输电线路%同塔多回%雷击跳闸率%影响因素%耐%雷水平%故障分析
輸電線路%同塔多迴%雷擊跳閘率%影響因素%耐%雷水平%故障分析
수전선로%동탑다회%뢰격도갑솔%영향인소%내%뢰수평%고장분석
transmission lines%multi-circuit transmissionlines on the same tower%lightning tripout rate%influencing factors%lightning resisting level%fault analysis
近年来广东地区线路工程用地趋紧，同塔多回线路规模迅速增大，导致多回线路雷击同时跳闸比例显著上升，给电网安全运行带来新的挑战。介绍同塔线路雷击同时跳闸的特点，分析雷击跳闸关键因素的影响，并对典型雷击同时跳闸故障进行电磁暂态复原分析。指出雷电反击是造成同塔线路多回同时跳闸的绝对主因，但强雷暴过程中连续雷电绕击也会导致多回线路同时跳闸，强调应重点防止110、220kV同塔线路双回雷击同时跳闸。并指出同塔线路反击跳闸受工频电压及相序排列影响较大，雷击同时跳闸较多发生在同名相，且上横担绝缘子距雷击点较近较易发生闪络。
近年來廣東地區線路工程用地趨緊，同塔多迴線路規模迅速增大，導緻多迴線路雷擊同時跳閘比例顯著上升，給電網安全運行帶來新的挑戰。介紹同塔線路雷擊同時跳閘的特點，分析雷擊跳閘關鍵因素的影響，併對典型雷擊同時跳閘故障進行電磁暫態複原分析。指齣雷電反擊是造成同塔線路多迴同時跳閘的絕對主因，但彊雷暴過程中連續雷電繞擊也會導緻多迴線路同時跳閘，彊調應重點防止110、220kV同塔線路雙迴雷擊同時跳閘。併指齣同塔線路反擊跳閘受工頻電壓及相序排列影響較大，雷擊同時跳閘較多髮生在同名相，且上橫擔絕緣子距雷擊點較近較易髮生閃絡。
근년래엄동지구선로공정용지추긴，동탑다회선로규모신속증대，도치다회선로뢰격동시도갑비례현저상승，급전망안전운행대래신적도전。개소동탑선로뢰격동시도갑적특점，분석뢰격도갑관건인소적영향，병대전형뢰격동시도갑고장진행전자잠태복원분석。지출뇌전반격시조성동탑선로다회동시도갑적절대주인，단강뇌폭과정중련속뇌전요격야회도치다회선로동시도갑，강조응중점방지110、220kV동탑선로쌍회뢰격동시도갑。병지출동탑선로반격도갑수공빈전압급상서배렬영향교대，뢰격동시도갑교다발생재동명상，차상횡담절연자거뢰격점교근교역발생섬락。
In recent years the land supply for power construction projects is decreased increasingly and it makes the planner of UHV/EHV transmission line construction inclined to adopt the structure of multi-circuit transmission lines on the same tower, therefore as the result the proportion of simultaneous lightning outage of multi-circuit transmission lines on the same tower evidently raises, thus the secure operation of power grid is affected. The peculiarity of simultaneous lightning outage occurred in multi-circuit transmission lines on the same tower is presented and the influences of key factors on lightning outage are analyzed, besides, the recovery analysis on electromagnetic transient of typical simultaneous lightning outage fault is performed. Results of recovery analysis show that the main reason leading to simultaneous lightning outage of multi-circuit transmission lines on the same tower is the flashback of lightning, however successive shielding failures lead to simultaneous lightning outage of multi-circuit transmission lines as well. It is emphasized that special attentions should be paid to the prevention of simultaneous lightning outage occurred in 110 kV and 220 kV double circuit transmission lines on the same tower, and it is pointed out that the power frequency voltage and the phase sequence arrangement of transmission lines on the same tower greatly influence the lightning outage caused by flashback; the simultaneous lightning outages often occur in the same phase of multi-circuit transmission lines; and the flashover is prone to occur on the upper cross arm insulator that is closer to the struck point.
