Abstract
The Gas Insulated Switchgear (GIS) with voltage levels of 500 kV and above adopts three-phase sub-box structure, so the electromagnetic induction effect generated by wire current may generate a large induction current on the shell, as well as its connection and support components, which will further cause local heating and affect the insulation performance of the equipment. However, the accuracy of GIS circulation calculation in existing studies is insufficient. As for the grounding scheme, there are only regular optimization measures, no heating check of full current-carrying components, and no measured data for verification. Therefore, it is essential to establish an electromagnetic transient model to calculate GIS branch bus circulation accurately, design a grounding scheme and perform heat verification. In this paper, a GIS coupling model considering the phase difference of three-phase current is built to calculate the circulation. Besides, the influence of the terminal collector strip, the scheme of grounding wire and shorting strip on circulation is analyzed. Furthermore, a two-dimensional flow-temperature field coupling model is established using finite element simulation method to calculate the heating of each current-carrying component and ensure that the temperature result in the optimized scheme does not exceed the limiting value. Finally, the optimization measures of grounding scheme are put forward to reduce the circulation.
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Wentao, H., Yaqi, Z., Yongxia, H. (2023). 500 kV GIS Branch Bus Bar Grounding Scheme Optimization and Heat Verification. In: Dai, D., Zhang, C., Fang, Z., Lu, X. (eds) Proceedings of the 4th International Symposium on Plasma and Energy Conversion. ISPEC 2022. Springer Proceedings in Physics, vol 391. Springer, Singapore. https://doi.org/10.1007/978-981-99-1576-7_38
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DOI: https://doi.org/10.1007/978-981-99-1576-7_38
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