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This paper presents a numerical model for simulating the breakdown performance of SF6-N2 and SF6-CF4 mixtures gas. Firstly, the ionization and attachment coefficients of mixtures were obtained by solving Boltzmann equation at different mixing ratio and 300K. All these parameters were applied on the fluid model to investigate the mechanism of electron number density varies along with time and space...
Based on dynamic characteristic of microscopic particles in discharge process, streamer discharge model is set up. Combining finite element method and flux corrected transport method, the paper simulate the streamer discharge process at SF6/ N2 with mixing ratio of 50%:50%. On this basis, experimental platform for gas discharge is set up, and breakdown voltages of SF6/N2 gas mixtures are measured...
The insulation characteristic of high voltage circuit breaker in cold regions is the basis for the design of high voltage circuit breaker. In this paper, several gas of physical and insulated properties can be used in cold region circuit breaker are compares, CF4 gas was fed to use gas for cold region circuit breaker is obtained. Breakdown experiment of CF4 under typical electrodes was investigated,...
Fourier transform are used on the very fast transient overvoltage (VFTO) discretion, different spectral components of transient voltage waveform are achieved. The mathematical model of the transient electric field is deduced considering dielectric polarization loss and displacement current. FEM is adopted to calculate the transient electric field of gas insulated switchgear disk insulator under the...
he temperature rise of GIS disconnector is a fatal factor that affects the power grid service performance. In this paper, a three-dimensional Finite Element Analysis model is established to analyze the magnetic-thermal field of disconnector cabinet. The distribution of magnetic field intensity and the values of eddy currents are calculated in the magnetic field first. Then the eddy current loss is...
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