CAJ | 학술논문

为探讨避雷线加装水平侧针对改善特高压交流输电线路雷电屏蔽性能的机理,开展了1:10和1:20特高压交流线路缩比模型下雷电屏蔽模拟实验及其放电观测,对实验结果进行了分析,并重点结合放电物理过程探讨了放电击中点的选择性和侧针屏蔽增效的机理.研究发现:下行先导初期发展过程中随机取向与各目的物迎面放电的竞争过程都与放电击中点的选择密切相关,下行放电与迎面放电也是相互作用与影响的;在各种间隙结构下,侧针的长度在大于对应间隙的临界电晕半径时才能起到明显的屏蔽增效作用.
위탐토피뢰선가장수평측침대개선특고압교류수전선로뇌전병폐성능적궤리,개전료1:10화1:20특고압교류선로축비모형하뇌전병폐모의실험급기방전관측,대실험결과진행료분석,병중점결합방전물리과정탐토료방전격중점적선택성화측침병폐증효적궤리.연구발현:하행선도초기발전과정중수궤취향여각목적물영면방전적경쟁과정도여방전격중점적선택밀절상관,하행방전여영면방전야시상호작용여영향적;재각충간극결구하,측침적장도재대우대응간극적림계전훈반경시재능기도명현적병폐증효작용.
Lightning shielding failure is one of the biggest problems for UHV transmission lines to be solved.We discussed the important technology of increasing the lightning shielding efficiency of UHV transmission lines.To study this technology,a large amount of scaled simulation experiments were conducted,where the ground wire was installed with a horizontal short needle so as to increase the ground wire's lightning shielding efficiency.A highspeed video camera was used to observe the discharging process,and with the observation results,the selectivity of discharging striking point and the mechanism of increasing the shielding efficiency by the horizontal short needle were analyzed.The analysis indicates that a close relationship between the random propagation direction of the initial downward leader and the competition of upward discharge on the objectives is found.And the downward leader and the upward discharge also have interactions on each other.In different gap configurations,the horizontal short needle would achieve the effects of increasing the ground wire's lightning shield efficiency only when its length is larger than the corresponding critical corona radius of the ground wire.