| With the development of Ultra-high voltage power grid, the transient enclosure voltage (TEV) with high amplitude and broad band resulted from the gas insulated switchgear (GIS) switching operation may cause serious interference on the normal operation of the intelligent electronic device in control cabinets.In this thesis, the full-wave simulation of the GIS switching process is carried out by using the method of finite integral time domain. To verify the validation of the full wave simulation, we select a simple model according to the size of 1100 kV GIS. The simple model can be solved by the transmission line method. The finite element method is also used to calculate the model. Compare the results calculated by the three methods, we can acquire some conclusions.Then, a model of a practical 1100 kV GIS single-phase test loop is established. For this model, full-wave simulation of electromagnetic transients is conducted and single striking time-domain waveforms of TEV at different positions are acquired. It is in good agreement with the actual measurement results in the aspect of waveform characteristic parameters. And using the simulation results of TEV, the waveform characteristics, frequency characteristics and spatial distribution characteristics of TEV are analyzed in detail. Finally, two affecting factors of TEV are analyzed:one is the lossy material coated on the inner surface of GIS enclosure, another is the structure and material of grounding grid. Research achievements of this study are helpful for the security protection and electromagnetic compatibility design of the intelligent electronic device. |
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