电网技术
電網技術
전망기술
POWER SYSTEM TECHNOLOGY
2015年
1期
118-122
,共5页
鄂盛龙%文习山%蓝磊%王羽%安韵竹%戴敏%李志军%叶奇明
鄂盛龍%文習山%藍磊%王羽%安韻竹%戴敏%李誌軍%葉奇明
악성룡%문습산%람뢰%왕우%안운죽%대민%리지군%협기명
特高压%雷击特性%模拟试验%地形%放电路径%静电场计算
特高壓%雷擊特性%模擬試驗%地形%放電路徑%靜電場計算
특고압%뢰격특성%모의시험%지형%방전로경%정전장계산
UHV%lightning performance%simulation tests%topography%discharge path%electrostatic field calculation
雷击是造成输电线路故障的主要原因之一,为研究平原和山区特高压输电线路遭受雷击的差异性,以1:12.5比例缩小的特高压 SZ322型塔为研究对象,利用负极性80/2500μs操作冲击电压.波,分别展开了平地和山区2种不同地形条件下的缩比线路雷击模拟放电试验,并结合空间静电场分布仿真计算对2种地形上放电路径分布的差异性进行定性分析。试验及仿真结果表明:平原和山区2种地形上放电路径选择性存在明显的差别,输电线路附近遭受雷击时,相对于平原上,斜山坡上输电线的电场强度更大,且下行先导头部的电场强度最大区域明显向输电线路侧偏移,因此山区的输电线更容易遭受雷击,大地的屏蔽效果差。当放电间隙尺寸增大时,结论依然成立,且2种地形上线路的绕击率差距增大,但两者的绕击率均下降,同时大地的屏蔽效果增强。研究结果对特高压输电线路雷电防护工作具有一定的参考意义。
雷擊是造成輸電線路故障的主要原因之一,為研究平原和山區特高壓輸電線路遭受雷擊的差異性,以1:12.5比例縮小的特高壓 SZ322型塔為研究對象,利用負極性80/2500μs操作遲擊電壓.波,分彆展開瞭平地和山區2種不同地形條件下的縮比線路雷擊模擬放電試驗,併結閤空間靜電場分佈倣真計算對2種地形上放電路徑分佈的差異性進行定性分析。試驗及倣真結果錶明:平原和山區2種地形上放電路徑選擇性存在明顯的差彆,輸電線路附近遭受雷擊時,相對于平原上,斜山坡上輸電線的電場彊度更大,且下行先導頭部的電場彊度最大區域明顯嚮輸電線路側偏移,因此山區的輸電線更容易遭受雷擊,大地的屏蔽效果差。噹放電間隙呎吋增大時,結論依然成立,且2種地形上線路的繞擊率差距增大,但兩者的繞擊率均下降,同時大地的屏蔽效果增彊。研究結果對特高壓輸電線路雷電防護工作具有一定的參攷意義。
뢰격시조성수전선로고장적주요원인지일,위연구평원화산구특고압수전선로조수뢰격적차이성,이1:12.5비례축소적특고압 SZ322형탑위연구대상,이용부겁성80/2500μs조작충격전압.파,분별전개료평지화산구2충불동지형조건하적축비선로뢰격모의방전시험,병결합공간정전장분포방진계산대2충지형상방전로경분포적차이성진행정성분석。시험급방진결과표명:평원화산구2충지형상방전로경선택성존재명현적차별,수전선로부근조수뢰격시,상대우평원상,사산파상수전선적전장강도경대,차하행선도두부적전장강도최대구역명현향수전선로측편이,인차산구적수전선경용역조수뢰격,대지적병폐효과차。당방전간극척촌증대시,결론의연성립,차2충지형상선로적요격솔차거증대,단량자적요격솔균하강,동시대지적병폐효과증강。연구결과대특고압수전선로뇌전방호공작구유일정적삼고의의。
Lightning stroke is one of the main reasons that cause faults in transmission lines. To study the effect of topography on the lightning performance of UHV transmission lines, with negative 80/2 500μs switching impulse voltage, large-sized model of the SZ322 tower with the ratio of 1:12.5 for 1 000kV UHV transmission lines was used to conduct the simulation tests in plain and mountain areas in this paper, besides, test results were qualitatively analyzed by simulation of space electric field. The test and simulation results show that the selectivity of discharge path in mountain area is obviously different from that in plain area. When lightning happens near the transmission lines, compared with the lines on flat ground, the electric field intensity of lines on hillside is stronger and the strongest part of electric field intensity around lightning leader is much closer to the transmission lines, thus, shielding failure rate of transmission lines in mountain area is higher and shielding effect of ground is poor. When discharge gap distance is increased, the conclusion remains valid and disparity of shielding failure rate of transmission lines in the two areas widens, but shielding failure rate of transmission lines in both areas decreases and shielding effect of ground strengthens. The obtained results may provide reference to lightning protection for UHV transmission lines.