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工程科学与技术:2023,55(4):11-20
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GIS设备用表带触指电连接结构接触电阻的分形理论计算与分析
(1.国网安徽省电力有限公司电力科学研究院, 安徽 合肥 230601;2.西安交通大学 电气绝缘与电力设备国家重点实验室, 陕西 西安 710049)
Calculation and Analysis of the Electrical Contact Resistance of the Strap Contacts Used in GIS Equipment Based on the Fractal Model
(1.State Grid Anhui Electric Power Research Inst., Hefei 230601, China;2.State Key Lab. of Electrical Insulation and Power Equipment, Xi'an Jiaotong Univ., Xi'an 710049, China)
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投稿时间:2022-08-24    修订日期:2023-01-13
中文摘要: 电连接结构的接触电阻(electrical contact resistance,ECR)是评价电接触系统可靠性的重要指标。表带触指是环保气体GIS设备中重要的电连接部件,其ECR不仅影响回路总电阻,通流过大导体振动、安装不当等因素也会导致电接触不良,引发触指局部过热,引起绝缘放电等故障,还会关系到环保气体GIS设备的运行稳定性。为研究触指ECR的产生机理和变化规律,采用MATLAB和激光共聚焦显微镜捕捉接触区域灰度图像,获得触指接触区域的名义接触面积Aa和分形维数D;运用分形理论模型,数值计算了表带触指电连接结构的ECR,并通过ECR试验测量,验证了应用分形理论模型解析计算表带触指电连接结构ECR的合理性和准确性;研究了表带触指电接触过程中的弹性变形、第一弹塑性变形、第二弹塑性变形和塑性变形4个阶段,对比分析了不同分形维数对触指电接触实际接触面积的影响规律。研究发现:分形理论模型可用于GIS设备用表带触指的接触电阻理论计算;触指电接触表面形貌越复杂,分形维数越大,触点变形越先进入弹塑性阶段,也越易进入第二弹塑性变形阶段,达到相同承载能力所需实际接触面积也越小。研究成果有助于环保气体GIS电连接结构的优化设计,可为环保气体GIS设备触指电连接结构的多物理场计算和电接触性能的状态评估提供理论基础。
Abstract:Contact resistance of an electrical connection structure (ECR) is an important indicator to evaluate the reliability of the electrical contact system. The strap contact is an important electrical connection component in eco-friendly insulating gas GIS equipment. Its ECR will affect the total resistance of the equipment. Factors such as the excessive current flow, the conductor vibration, and the improper installation can also leads to poor electrical contact, local overheating of the strap contacts, insulation discharge and other failures, which is directly related to the operation stability of environmental protection gas GIS equipment. To study the mechanism and regularity of ECR, MATLAB and laser confocal microscope were used to capture the grayscale image of the contact area in this paper. The nominal contact area Aa and fractal dimension D of the contact area were obtained. Using the fractal theoretical model, the contact resistance of the strap contact was numerically calculated. The rationality and accuracy of applying the fractal theoretical model to analytically calculate the contact resistance of the electrical connection structure was verified through ECR test measurements. Since ECR is closely related to the actual contact area, the elastic deformation, the first elastic-plastic deformation, the second elastic-plastic deformation and the plastic deformation during the electrical contact process of the strap contact were studied. What's more, the effect of different fractal dimensions on the actual contact area of the electrical contact was studied. The research found that the fractal theoretical model can be used for the theoretical calculation of ECR for the strap contact of the GIS equipment. It was obtained that the larger the fractal dimension of the electrical contact surface, the earlier the contact deformation enters the elastic-plastic stage, and the easier it is to enter the second elastic stage. In the plastic deformation stage, the more complex the surface morphology, the smaller the actual contact area required to achieve the same bearing capacity. The research results are helpful for the optimal design of the eco-friendly insulating gas GIS electrical connection structure, and can provide a theoretical basis for the multi-physics calculation of the eco-friendly insulating gas GIS equipment electrical connection structure and the state evaluation of the electrical contact performance.
文章编号:202200890     中图分类号:TM85    文献标志码:
基金项目:国网安徽省电力有限公司科技项目(B3120521000Z)
作者简介:第一作者:杨为(1984-),男,高级工程师.研究方向:变电设备运维检测技术与标准修制订.E-mail:hfut_mars@163.com;通信作者:王青于,E-mail:wqy.1991624@xjtu.edu.cn
引用文本:
杨为,朱太云,任汀,王青于,靳守锋.GIS设备用表带触指电连接结构接触电阻的分形理论计算与分析[J].工程科学与技术,2023,55(4):11-20.
YANG Wei,ZHU Taiyun,REN Ting,WANG Qingyu,JIN Shoufeng.Calculation and Analysis of the Electrical Contact Resistance of the Strap Contacts Used in GIS Equipment Based on the Fractal Model[J].Advanced Engineering Sciences,2023,55(4):11-20.