雷击过程中避雷线弧根的滑行运动建模与分析  

Modeling and analysis of sliding motion of arc root along OGW during lightning strike

作　　者：郭德明 林子铭 刘刚[1,2] 王珮沣 彭向阳 王锐 GUO Deming;LIN Ziming;LIU Gang;WANG Peifeng;PENG Xiangyang;WANG Rui(School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,China;Guangdong Artificial Intelligence and Digital Economy Laboratory(Guangzhou),Guangzhou 510335,China;Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China)

机构地区：[1]华南理工大学电力学院,广东广州510641 [2]人工智能与数字经济广东省实验室(广州),广东广州510335 [3]广东电网有限责任公司电力科学研究院,广东广州510080

出　　处：《电力工程技术》2024年第5期181-188,共8页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51977083);广东省自然科学基金资助项目(2022A1515011182)。

摘　　要：避雷线(overhead ground wire,OGW)是防止输电导线遭受雷击的重要设备。当OGW遭受雷击时,弧根的滑行运动会导致不一样的损伤机理,因此有必要对弧根的滑行运动进行分析,从而为损伤机理的研究和避雷线的选型设计提供滑行位移的数据支持。首先,文中基于链式建模方法建立了弧根沿着OGW的滑行运动模型,并通过分析电磁力的主要影响范围,缩小了建模的空间边界,从而大幅度减少了计算量;然后,通过实验室内的针-线放电实验对模型进行了验证;最后,基于所建立的模型,对弧根滑行位移的影响因素,包括热浮力、回击电流和持续电流,进行了分析。结果表明,在回击电流的作用下,热浮力的影响可以忽略。弧根的滑行位移与波尾时间成正相关,而与波头时间无关。在持续电流的作用下,热浮力会影响弧根滑行位移的评估结果,最大误差超过了25%。Overhead ground wire(OGW)is an important equipment to prevent transmission wire from being struck by lightning.When OGW is struck by lightning,the sliding motion of arc root causes different damage mechanism.Therefore,it is necessary to analyze the sliding motion of arc root first,so as to provide data support of sliding displacement for the research of damage mechanism.In this paper,the sliding motion model of arc root along OGW is established based on the arc chain modeling method.By analyzing the main influence range of the electromagnetic force,the space boundary of modeling is narrowed,so the calculation amount is greatly reduced.Then,the model is verified by the needle-wire discharge experiment in the laboratory.Finally,based on the established model,the factors affecting the sliding displacement of arc root are analyzed,including thermal buoyancy,return stroke and continuous current.The results show that the effect of thermal buoyancy can be ignored under the action of return stroke.The sliding displacement of arc root is positively correlated with the wavelength time,but not with the wave head time.However,under the action of continuous current,thermal buoyancy affects the evaluation result of arc root sliding displacement,and the maximum error is more than 25%.

关 键 词：雷击 弧根 滑行运动 避雷线(OGW) 链式模型 回击电流 持续电流 

分 类 号：TM244[一般工业技术—材料科学与工程]