变电站保护小室在不同屏蔽方案下的电位分布研究  

Research on Potential Distribution in Substation Protective Chamber Under Different Shielding Schemes

作　　者：徐韵[1] 淡淑恒[1] 蔡立川 

机构地区：[1]上海电力学院,上海200090 [2]四川锦能电力设计有限公司,成都610000

出　　处：《高压电器》2016年第5期130-135,共6页High Voltage Apparatus

基　　金：上海绿色能源并网工程技术研究中心项目(13DZ2251900)~~

摘　　要：数字化变电站安放二次设备的保护小室直接放在距离一次设备很近的地方,一次设备的电压等级很高,可能会影响小室内二次设备的正常运行。笔者从研究不同屏蔽方案下保护小室内部电位分布情况入手,采用有限元法建立模型,分析了输电线位置变化、小室外覆盖金属网网格尺寸变化、构成金属网的金属丝粗细变化以及构成保护小室绝缘材料变化对小室内部电位分布的影响。结果表明:在近距离范围内,输电线距离小室的水平距离越远,小室内部电位越高;金属网网格尺寸越小、网丝截面积越大、构成小室的绝缘材料相对介电常数越大,小室内部电位越低。所得结论为工程施工提供一定的理论依据。The protective chamber placed the secondary equipment in digital substation is placed close to primary equipment, and the normal operation of the secondary equipment in the protective chamber may be affected by the primary equipment. Researching on the influential factors of potential in protective chamber, this article analyzes the effect of potential in protective chamber when the position of transmission line is changed, the grid size of metal mesh covering the protective chamber is varied and the thickness of the wire which constitutes the metal mesh is altered by FEM. In addition, this article also compares the shielding effectiveness of protective chamber with different insulation materials and the results shows that：the farther the horizontal distance between the power lines and the chamber, the higher the potential inside the chamber; when the size of metal mesh grid is smaller,the cross-section area of the wire mesh is smaller and the relative permittivity of the insulating material is larger,then the potential inside the chamber is lower. The results provide a theoretical foundation for the construction.

关 键 词：变电站 保护小室 电位变化 影响因素 

分 类 号：TM63[电气工程—电力系统及自动化]