高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2012年
4期
905-913
,共9页
沈志恒%赵斌财%周浩%龚坚刚%孙可%王东举
瀋誌恆%趙斌財%週浩%龔堅剛%孫可%王東舉
침지항%조빈재%주호%공견강%손가%왕동거
水平侧向短针%保护距离%电气几何模型(EGM)%防雷%绕击%架空线路%避雷针
水平側嚮短針%保護距離%電氣幾何模型(EGM)%防雷%繞擊%架空線路%避雷針
수평측향단침%보호거리%전기궤하모형(EGM)%방뢰%요격%가공선로%피뢰침
side needle%protection distance%electro-geometrical model(EGM)%lightning protection%shielding failure%overhead line%lightning rod
为评估在地线上安装水平侧向短针对输电线路的绕击保护效果,提出并建立了三维的电气几何模型（EGM）来计算水平侧向短针对导线的保护距离,总结了其安装和使用的规律。对110～500kV典型杆塔的计算结果表明：水平侧向短针具有一定的保护作用,但每根水平侧向短针的保护距离有限,其防绕击效果较依赖于安装数量;并且水平侧向短针对导线的保护距离受到导地线相对位置的较大影响,仅对部分保护角和塔头尺寸都较小的单回线路有效;而对于同塔多回输电线路,水平侧向短针无法起到实质上的防雷保护作用;此外,安装水平侧向短针后还会对地线的机械性能产生负面影响。因此可以认为,水平侧向短针的绕击保护效果有限,适用范围较窄,限制了它在输电线路防雷保护中的应用,该防雷措施还有待进一步的提高与完善。
為評估在地線上安裝水平側嚮短針對輸電線路的繞擊保護效果,提齣併建立瞭三維的電氣幾何模型（EGM）來計算水平側嚮短針對導線的保護距離,總結瞭其安裝和使用的規律。對110～500kV典型桿塔的計算結果錶明：水平側嚮短針具有一定的保護作用,但每根水平側嚮短針的保護距離有限,其防繞擊效果較依賴于安裝數量;併且水平側嚮短針對導線的保護距離受到導地線相對位置的較大影響,僅對部分保護角和塔頭呎吋都較小的單迴線路有效;而對于同塔多迴輸電線路,水平側嚮短針無法起到實質上的防雷保護作用;此外,安裝水平側嚮短針後還會對地線的機械性能產生負麵影響。因此可以認為,水平側嚮短針的繞擊保護效果有限,適用範圍較窄,限製瞭它在輸電線路防雷保護中的應用,該防雷措施還有待進一步的提高與完善。
위평고재지선상안장수평측향단침대수전선로적요격보호효과,제출병건립료삼유적전기궤하모형（EGM）래계산수평측향단침대도선적보호거리,총결료기안장화사용적규률。대110～500kV전형간탑적계산결과표명：수평측향단침구유일정적보호작용,단매근수평측향단침적보호거리유한,기방요격효과교의뢰우안장수량;병차수평측향단침대도선적보호거리수도도지선상대위치적교대영향,부대부분보호각화탑두척촌도교소적단회선로유효;이대우동탑다회수전선로,수평측향단침무법기도실질상적방뢰보호작용;차외,안장수평측향단침후환회대지선적궤계성능산생부면영향。인차가이인위,수평측향단침적요격보호효과유한,괄용범위교착,한제료타재수전선로방뢰보호중적응용,해방뢰조시환유대진일보적제고여완선。
To study the lightning protection techniques of overhead transmission line,and to estimate the protection effect of side needle which was used against lightning shielding failure,using a 3D electro-geometrical model（EGM）,we calculated the protection distance of side needle,and summarized its installation rule on ground wires.The calculation results of typical 110~500 kV lines show that side needle has a positive effect against shielding failure,but the protection distance of each needle is small.As a result,a large number of side needles are required to be installed on the ground wires in order to achieve good protection effect against shielding failure.And the relative positions of overhead line＇s conductor and ground wire have a great influence on the side needle＇s protection distance,showing that the side needle can only protect the single-circuit lines with small shielding angle and small tower size.For multi-circuit transmission lines,the side needle can not substantially help protect lightning shielding,mostly because of the large scale of the multi-circuit tower.In addition,the side needle has a negative impact on lines＇ mechanical properties after being installed on the ground wires.In conclusion,the side needle＇s protection effect is insufficient and can only be used on the particular types of transmission lines,which limits its applications in lightning protection against shielding failure.So the lightning protection measures need to be further improved and perfected.
