屏蔽网部分不接地对变电站建筑内部电压的影响  

Study on the Influence of Shielding Net Partial-Grounding on Internal Voltage of Substation Building

作　　者：安帅[1] 淡淑恒[1] 蔡立川 

机构地区：[1]上海电力学院,上海市200090 [2]四川电力送变电建设公司,成都市610051

出　　处：《中国电力》2014年第7期77-80,85,共5页Electric Power

基　　金：国家自然科学基金(50577040)~~

摘　　要：变电站外墙安装的屏蔽网与地面之间可能存在连接不充分的情况,为了研究这种情况对建筑内部电压的影响,利用有限元分析法建立模型,经计算分析得出以下结论:顶部有一片金属网不接地时各观测点平均电压为62.4V,侧面有一片金属网没有接地时各观测点平均电压为10.8V;顶部和侧面共有两片金属网没有接地时,顶部两片相邻金属网不接地对变电站内部电压影响最大,各观测点平均电压达到了182.4V,侧面2片不相邻金属网不接地对变电站内部电压影响最小,各观测点平均电压为19.4V。上述结论可为工程施工解决类似问题提供一定理论依据。The outer wall surface of a smart substation,in wich there are a lot of with electric power secondary equipments,needs to be covered with a grounded shielding net which can suppress induced voltage in the building.The shielding net is made up by several rectangular wire-nettings of one meter wide and several meters long,which are that connected with each other and grounded.However,because of geographical,the incomplete connection may exist between the wire-netting and the ground in actual construction.In order to study their impacst on induced voltage in the building in the situation of incomplete connection,the method of finite element analysis is used to build the model,and finally conduct the following conclusions.In case that one piece of the top shielding net is ungrounded,the average induced voltage of each observation points is 62.4 V,and If one side is unground,the average induced voltage of each observation points is 10.8 V; While a total of two pieces of shielding nets are unground on the top or the side of the building,two adjacent ungrounded shielding net on the top would take a largest efface on the induced voltage,the average induced voltage reaches 182.4 V; two non-adjacent shielding nets ungrounded on the side of the building would have a minimal influence on the voltage,the average induced voltage is 19.4 V.The above conclusions can provide the theoretical guide for solving relevant problems in the actual construction.

关 键 词：屏蔽网 感应电压 有限元分析 二次设备 过电压 接地金属网 

分 类 号：TM862[电气工程—高电压与绝缘技术]