In view of the existing standard gas insulated substation(GIS)bus bar design which only considers the temperature rise of main conductor and neglects the interior insulation level of GIS chamber, a new method based on SF6 breakdown criteria is presented to design GIS bus bar. Compared with traditional design methods, the new method could consider the GIS running reliability more comprehensively. Firstly, we proposed a criteria of SF6 gas and then a concept analyzing the margin of SF6 breakdown electric field Em. Then, we set up an electromagnetic-thermal-fluent multi-filed coupling model to calculate the Em. Moreover, factors influencing Em were discussed. Thereby, a new method to optimize dimension of the GIS bus bar is developed. The optimization principle is that making the value of SF6 breakdown margin Em to be the largest as much as possible. This optimization principle is that not only the temperature rise can meet the design requirements, but also the reliability and security of GIS equipment should be ensured from the insulation perspective. Finally, we investigated the insulation state of GIS when the very fast transient electromagnetic phenomena(VFT) occurring. The result shows that the GIS chamber is still in dangerous condition to some degree although the GIS dimension has been already optimized according to the rated working condition. This conclusion is very important for GIS bus bar design. It is indicated that the VFT condition which is always ignored in previous study should be taken into account when we design the GIS bus bar in the future.
KEY WORDS :SF6 gas;gas insulated substation bus bar;breakdown margin;optimization design;multi-field coupling;
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