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The chaos characteristic of vacuum circuit breaker (VCB) under different interruption conditions in synthetic circuit experiment is researched. Using four parameter and two parameter method, comparing the influence of the metal vapor arc model, the variations of voltage and current for different VCBs are obtained. And the chaos in synthetic circuit experiment for the demonstrated VCBs based on the...
In order to explain the mechanism of high voltage interrupter, a particle in cell method is used in our work to simulate the breakdown process before arc formation of vacuum and SF6 circuit breaker. The electrons and ions which play vital roles in this process are traced by Newton equation. The electrons from field emission, impact ionization and secondary electron emission are all considered in our...
Based on the theories of fractal and gas discharge, microscopic morphology of vacuum arc, the process of arc formation and development of discharge channel in the vacuum circuit breaker are simulated. The effects of temperature and electromagnetic field on the arc are also considered. The opening stroke is 10 mm in our work. Voltage is 75 kV, and current is 1 kA. The effects of temperature on the...
A combination of response surface methodology (RSM) and charge simulation method (CSM) is proposed and applied to calculate the electric field of a vacuum circuit breaker (VCB). The distribution of electric field with higher calculation precision has been achieved. And the calculation work has been reduced. Moreover, a new strategy for calculating and analyzing the unbounded electric field with thin...
Gas discharge model of vacuum circuit breaker based on fractal theory is established. For reflecting the influence of the variation of electric field on the discharge development, the gas discharge process was simulated and analyzed. Moreover, the combination effect of the electric field and the random consideration on the discharge was investigated. The whole spatio-temporal evolvement behavior of...
With the increasing of used quantity and voltage label of vacuum circuit breaker (VCB), the stability and reliability of VCB have very important significance for the reliable running of transmit electricity system. How to detect the mechanism characteristics of VCB, and obtain the characteristic parameters through the detecting data, and obtain the regularity of status examine and repair of VCB through...
Based on the theories of arc and gas discharge, a novel hybrid arc model in vacuum circuit breaker is proposed, considering the factors influencing on the arc formation from both microcosmic and macroscopic views. The evolution from initial discharge channel forming with breakdown to steady arc state is simulated. The results show that the radii of discharge channels are enlarging and the shapes of...
In this paper, the axial magnetic field of vacuum interrupter (VI) has been computed. Moreover, the static, transient magnetic field and 3D electric field have been analyzed using finite element method (FEM). The dynamic distributions of the axial magnetic field along the contact surface varying with interrupting instant and space have been simulated. Accordingly, the influence of the contact structure...
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