Study on Chaotics of Turbulent Gas Flow for a EHV SF6 Circuit Breaker

Based on the numerical computation of 2D compressible, viscous and turbulent gas flow physical-mathematical model for a extra high voltage SF₆ circuit breaker (EHV SF₆ CB), the aerodynamic behavior and pressure characteristics under no load interrupting have been obtained using the improved combination method of FVM and TVD scheme. And the pressure time series of different points, the phase space reconstruction of pressure time series have been achieved. Moreover, the embedding dimension and delay time are obtained using C-C method. And the largest Lyapunov exponent (LE) of the pressure time series using small data sets method has been calculated, which illustrates that the system exists chaotic behavior. Furthermore, the principal component analysis (PCA) shows that, during no load interruption, the turbulent gas flow pressure time series is a chaotic series.