Study on the circulating current calculation model and its influence factors of 500kV GIS branch bus

Authors：Zhang, Yaqi; Huang, Wentao; Li, Licheng; Han, Yongxia^*

Source：ELECTRIC POWER SYSTEMS RESEARCH, 2023, 217: 109162.

DOI：10.1016/j.epsr.2023.109162

• GIS branch bus
• Electromagnetic transient simulation model
• Circulating current
• Induced voltage
• Influence factors analysis

Circulating current generated by electromagnetic coupling may result in serious local heating, the system loss of the shell and the equipment outside, the acceleration of the deterioration of the equipment insulation and degradation of seismic performance of equipment. The accurate GIS shell circulating current modeling method can ensure safe and reliable operation of GIS branch bus and provide an effective reference for the design of circulating current reduction measures and the grounding scheme of GIS branch bus. This paper presents a complete electromagnetic transient simulation model of three-phase GIS branch bus with finite element simu-lation method. This method considered the influence of many factors on the modeling, including the layout of the support, the grounding, and the short-circuit bar of GIS branch bus. Based on this modeling method, the GIS branch bus model in 500 kV flexible direct-current back-to-back converter station was established to calculate the circulating current during steady-state operation. The influences of the support, the grounding and the short-circuit bar on the circulating current and the induced voltage at different positions were discussed, and the corresponding suggestions were put forward.

• Institution
  广东技术师范学院