电网技术
電網技術
전망기술
POWER SYSTEM TECHNOLOGY
2011年
11期
169-177
,共9页
沈志恒%赵斌财%周浩%邓旭%龚坚刚%姜文东%王灿灿%王武军%孙可%王东举
瀋誌恆%趙斌財%週浩%鄧旭%龔堅剛%薑文東%王燦燦%王武軍%孫可%王東舉
침지항%조빈재%주호%산욱%공견강%강문동%왕찬찬%왕무군%손가%왕동거
侧向避雷针%绕击%横担%杆塔%保护范围%电气几何模型%防雷
側嚮避雷針%繞擊%橫擔%桿塔%保護範圍%電氣幾何模型%防雷
측향피뢰침%요격%횡담%간탑%보호범위%전기궤하모형%방뢰
sideward rod%shielding failure%crossarm%transmission tower%protection range%electrogeometric model （EGM）%lightning protection
为评估在杆塔横担上安装侧向避雷针的防雷电绕击效果，提出建立三维的电气几何模型，计算侧向避雷针对导线的绕击保护距离，并总结了其安装和使用的规律。针对110～500kV典型杆塔线路的计算表明：侧向避雷针能较好地保护杆塔附近的重点绕击危险区域，从而可以有效地降低线路的绕击跳闸率。研究还表明，侧向避雷针对导线的保护效果会受到针杆长度和安装位置的影响，针杆的长度应大于2m，并且尽量架设在避雷线保护角较大的导线横担上。实际工程的运行经验表明，侧向避雷针确实可以在输电线路上起到较好的防雷效果，其有效性已得到证明。因此，对于雷害严重的高杆塔、山区输电线路，在杆塔的横担上安装侧向避雷针是线路防绕击治理的有效途径。
為評估在桿塔橫擔上安裝側嚮避雷針的防雷電繞擊效果，提齣建立三維的電氣幾何模型，計算側嚮避雷針對導線的繞擊保護距離，併總結瞭其安裝和使用的規律。針對110～500kV典型桿塔線路的計算錶明：側嚮避雷針能較好地保護桿塔附近的重點繞擊危險區域，從而可以有效地降低線路的繞擊跳閘率。研究還錶明，側嚮避雷針對導線的保護效果會受到針桿長度和安裝位置的影響，針桿的長度應大于2m，併且儘量架設在避雷線保護角較大的導線橫擔上。實際工程的運行經驗錶明，側嚮避雷針確實可以在輸電線路上起到較好的防雷效果，其有效性已得到證明。因此，對于雷害嚴重的高桿塔、山區輸電線路，在桿塔的橫擔上安裝側嚮避雷針是線路防繞擊治理的有效途徑。
위평고재간탑횡담상안장측향피뢰침적방뇌전요격효과，제출건립삼유적전기궤하모형，계산측향피뢰침대도선적요격보호거리，병총결료기안장화사용적규률。침대110～500kV전형간탑선로적계산표명：측향피뢰침능교호지보호간탑부근적중점요격위험구역，종이가이유효지강저선로적요격도갑솔。연구환표명，측향피뢰침대도선적보호효과회수도침간장도화안장위치적영향，침간적장도응대우2m，병차진량가설재피뢰선보호각교대적도선횡담상。실제공정적운행경험표명，측향피뢰침학실가이재수전선로상기도교호적방뢰효과，기유효성이득도증명。인차，대우뇌해엄중적고간탑、산구수전선로，재간탑적횡담상안장측향피뢰침시선로방요격치리적유효도경。
To assess the effect of protecting transmission lines from shielding failure by sideward rods installed onto crossarm of towers, a three-dimensional electrogeometrical model is proposed to calculate the protection range of sideward rod that protects transmission line from shielding failure, and the rule for its application and installation are summarized. Calculation results of typical transmission tower, which transmission lines in voltage classes from 110kV to 500kV are erected on, show that the sideward rod can effectively protect transmission lines, which are located in the dangerous area near the tower head, from shielding failure, thus the shielding failure trip-out rate can be decreased. Research results also show that the protective effect of sideward rod will be influenced by both rod length and installation position, so the length of the rod should be longer than two meters and have to be intalled onto the corssarm under larger angle of shade of overhead ground wire. Practical operational experiences show that the sideward rod can assuredly play an effective role in protecting transmission lines from shielding failure. Thus, it is an effective approach of protecting transmission line from shileding failure to install sideward rods onto the crossarms of transmission towers located in the regions with severe lightning damages such as mountain area and so on as well as onto the crossarms of tall transmission tower.
