高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2010年
1期
275-280
,共6页
胡伟%陈勇%蔡炜%孟晓波%王黎明%傅观君%朱普轩
鬍偉%陳勇%蔡煒%孟曉波%王黎明%傅觀君%硃普軒
호위%진용%채위%맹효파%왕려명%부관군%주보헌
1000kV%同塔双回%脱冰跳跃%模拟试验%仿真计算%水平偏移
1000kV%同塔雙迴%脫冰跳躍%模擬試驗%倣真計算%水平偏移
1000kV%동탑쌍회%탈빙도약%모의시험%방진계산%수평편이
1000 kV%double circuit on the same tower%ice-shedding%simulation test%simulation computation%horizontal-shift
导线脱冰会引起导线的剧烈运动,使导线跳跃上下摆动,将导致导地线间或导线档中空气间隙的减小,严重时引起闪络;特高压线路由于导线分裂根数较多,截面较大,其脱冰跳跃问题更为严重,特高压输电线路导线脱冰跳跃的考虑对于导线排列,杆塔选型,档距配置等都有重要意义.为此首先进行了单导线覆冰脱落模拟试验研究,研究了不同档距组合、不同脱冰方式下的导线脱冰跳跃规律.还通过计算机仿真的方法针对试验工况进行数值模拟,仿真计算与模拟试验的结果具有相同的规律性.建立了适用于1000 kV交流同塔双回输电线路导线脱冰跳跃分析的3自由度多档导线模型,分析了连续档数、档距组合、档距大小、导线机械参数因素对特高压同塔输电线路脱冰跳跃的影响.分析了15 mm覆冰情况下特高压线路导线脱冰跳跃水平.研究表明,在15 mm覆冰及以下时,特高压同塔双回输电线路相间导线不需要水平偏移,在导线发生脱冰跳跃时线路也能安全运行.
導線脫冰會引起導線的劇烈運動,使導線跳躍上下襬動,將導緻導地線間或導線檔中空氣間隙的減小,嚴重時引起閃絡;特高壓線路由于導線分裂根數較多,截麵較大,其脫冰跳躍問題更為嚴重,特高壓輸電線路導線脫冰跳躍的攷慮對于導線排列,桿塔選型,檔距配置等都有重要意義.為此首先進行瞭單導線覆冰脫落模擬試驗研究,研究瞭不同檔距組閤、不同脫冰方式下的導線脫冰跳躍規律.還通過計算機倣真的方法針對試驗工況進行數值模擬,倣真計算與模擬試驗的結果具有相同的規律性.建立瞭適用于1000 kV交流同塔雙迴輸電線路導線脫冰跳躍分析的3自由度多檔導線模型,分析瞭連續檔數、檔距組閤、檔距大小、導線機械參數因素對特高壓同塔輸電線路脫冰跳躍的影響.分析瞭15 mm覆冰情況下特高壓線路導線脫冰跳躍水平.研究錶明,在15 mm覆冰及以下時,特高壓同塔雙迴輸電線路相間導線不需要水平偏移,在導線髮生脫冰跳躍時線路也能安全運行.
도선탈빙회인기도선적극렬운동,사도선도약상하파동,장도치도지선간혹도선당중공기간극적감소,엄중시인기섬락;특고압선로유우도선분렬근수교다,절면교대,기탈빙도약문제경위엄중,특고압수전선로도선탈빙도약적고필대우도선배렬,간탑선형,당거배치등도유중요의의.위차수선진행료단도선복빙탈락모의시험연구,연구료불동당거조합、불동탈빙방식하적도선탈빙도약규률.환통과계산궤방진적방법침대시험공황진행수치모의,방진계산여모의시험적결과구유상동적규률성.건립료괄용우1000 kV교류동탑쌍회수전선로도선탈빙도약분석적3자유도다당도선모형,분석료련속당수、당거조합、당거대소、도선궤계삼수인소대특고압동탑수전선로탈빙도약적영향.분석료15 mm복빙정황하특고압선로도선탈빙도약수평.연구표명,재15 mm복빙급이하시,특고압동탑쌍회수전선로상간도선불수요수평편이,재도선발생탈빙도약시선로야능안전운행.
The rules of ice-shedding characteristics were acquired by simulation tests,and various span configurations as well as ice-shedding mode were taken into consideration.Furthermore,numerical computation was done according to the test conditions.Good agreement between the computational and test results was obtained which proves the validity of both the test and numerical methods.Then a 3DOF(degree of freedom)dynamic model of multi-span line suitable for analyzing UHV ice-shedding was presented.The influential factors including multi-span configuration,span length,number of spans per line section,and mechanical parameters of conductor are studied.The ice-shedding height of UHV was analyzed when the icing thickness was 15 mm.Results show that interphase conductors of UHV double circuit transmission line needn't have horizontal displacement at the condition of 15 mm ice thickness and below.When the ice-shedding from the conductor happens,the lines can also work safely.