GIS高压母线段间连接缝隙造成的过热分析

doi:10.19595/j.cnki.1000-6753.tces.161561

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摘要为了便于安装、运输和检修,气体绝缘变电站（GIS）内的高压母线经常在现场用钢制螺栓分段组装。由于存在公差,在某些分段母线之间可能存在缝隙,在缝隙处可能由于钢制螺栓导流引起过热,进而发生故障。针对多座220kV GIS母线发生的过热导致的短路,研究不同条件下紧凑型三相一体和单体GIS高压母线段间的温度场分布及其与电流的关系,基于有限元法建立综合考虑电流大小、接触缝隙、螺栓材料、螺纹形态、传热系数与氧化铝薄膜等影响因素的多物理场耦合分析模型,计算分析三相母线与单相母线在不同情况下的最大允许通过电流值。通过分析发现缝隙的大小对温度的影响较大。随着缝隙的扩大,当缝隙处导流螺栓为钢制螺栓时,整体温度会明显增加,较采用铜制螺栓时增加近10~50K。该研究成果对GIS母线设计具有指导性的作用,并为保证其长期安全、可靠运行提供了理论依据。

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关键词 ：气体绝缘变电站, 母线, 螺栓, 温度场, 缝隙

Abstract：The high-voltage busbar within GIS is usually segmented and assembled with steel bolt on site for ease of installation, transportation and maintenance. Gap may exist between some segmented busbars due to the tolerance, and in which only the steel bolts play the role of current conduction. Therefore when current is larger, the bolt can be melt gradually and fault may be occurred. In response to the short faults in some 220kV GIS, we investi-gated the temperature field distribution between the high-voltage busbars as well as its relationship with the current under different conditions. Furthermore, the coupled multi-physics model considered current, the connection gaps, bolts' material, thread geometries, heat-transfer coefficients and alumina membranes was also built based on the finite element method. The allowable maximal value of the current in three-phase and single-phase busbar in different situations was also calculated. The analysis indicates that the size of the gap has great influence on the temperature. And we find that the temperature will increase at around 10K to 50K with the gap when the bolt material is made of steel. This research will play a guiding role for GIS design and support theoretical base to ensure its long-term safety and reliable operation.

Key words： Gas insulated substation busbar bolt temperature field gap

收稿日期: 2016-09-23 出版日期: 2017-09-14

PACS:

TM154.2

基金资助:南方电网科技项目资助（GZM2015-006）

通讯作者: 卢斌先男,1969年生,男,博士,教授,主要从事电力系统电磁兼容、电磁测量及电磁场数值计算等方面的研究工作。E-mail: lbx@ncepu.edu.cn

作者简介: 宁宇女,1986年生,硕士,工程师,主要从事电网设备技术监督及状态检测管理工作。E-mail: ningyu@guangzhou.csg.cn

引用本文:

宁宇, 孙洪宇, 张伟, 卢斌先, 葛东阳. GIS高压母线段间连接缝隙造成的过热分析[J]. 电工技术学报, 2017, 32(增刊1): 217-224. Ning Yu, Sun Hongyu, Zhang Wei, Lu Binxian, Ge Dongyang. Overheat Analysis on the Connection Gap in GIS with the Sections Connected by Bolts. Transactions of China Electrotechnical Society, 2017, 32(增刊1): 217-224.

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