GIS高压母线段间连接缝隙造成的过热分析

发布时间：2018-07-23 14:50

【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。
[Abstract]:For easy installation, transportation and maintenance, high voltage busbar in gas insulated substation (GIS) is often assembled with steel bolts in the field. Because of the tolerance, there may be gaps between some segment busbars, and the cracks may be caused by overheating caused by steel bolt diversion at the gap, and then faults will occur. In view of the short circuit caused by overheating of multiple 220kV GIS busbar, the temperature field distribution and its relation with current between compact three-phase bus and single GIS high-voltage busbar under different conditions are studied. Based on the finite element method, the current size is considered synthetically. The multi-physical field coupling analysis model of the influence factors, such as contact slot, bolt material, thread shape, heat transfer coefficient and alumina film, is used to calculate and analyze the maximum allowable current value of three-phase busbar and single-phase busbar under different conditions. It is found that the size of the gap has a great influence on the temperature. With the expansion of the gap, when the diversion bolt is made of steel at the gap, the whole temperature will increase obviously, which is about 10 ~ 50 Ks more than that of the copper bolt. The research results can guide the design of GIS busbar and provide a theoretical basis for its long-term safety and reliable operation.
【作者单位】：广州供电局有限公司;华北电力大学高电压与电磁兼容北京市重点实验室;国网湖南省电力公司检修公司;国网北京市电力公司检修分公司;
【基金】：南方电网科技项目资助(GZM2015-006)
【分类号】：TM63

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