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The residual axial magnetic field (AMF) at current zero, which is caused by large di/dt during the forced current-zero stage of DC interruption based on the technique of artificial current zero, has significant influence on the interruption performance of the vacuum circuit breaker. In this paper, a model of AMF contacts is developed by finite-element-analysis software, Ansys. The eddy current induced...
With the development of HVDC technology, the demand of HVDC circuit breaker is more and more urgent, where the testing standards for HVDC circuit breaker is still absent. It's impractical to carry out test in the real HVDC system at present. The high-power HVDC source is also a high-cost scheme. Therefore, in most of the experiments of HVDC circuit breaker, the current is supplied by AC source. In...
With the development of HVDC technology, the demand of HVDC circuit breaker is becoming urgent, whereas, a commercial HVDC circuit breaker is still not available. A prototype of HVDC circuit breaker based on artificial current zero and its testing scheme is proposed in this paper. Then the DC interruption experiment is carried on. In the DC interruption experiment, an 8kA DC current is interrupted...
HVDC interruption technique is the bottleneck problem of flexible HVDC project. The HVDC vacuum circuit breaker based on artificial current zero is a feasible and effective method to solve this problem. In this circuit breaker, the parameters of the commutation branch have a vital influence for the breaking process. In this paper, the interruption process for HVDC based on artificial current zero...
The influence of lagged axial magnetic field (AMF) due to eddy current induced in contacts system on the distribution of cathode spots (CSs) in current-zero stage of vacuum arc with different current falling rates was investigated experimentally. Experiments were conducted with cup-shaped AMF contacts in a demountable vacuum chamber. The characteristic of CSs distribution of triggered vacuum arc in...
In this paper, based on a two-dimensional (2D) transient magneto-hydrodynamic (MHD) model, HCVA under different interruption conditions was simulated and analyzed. The simulation results of power-frequency current show that the simulation results of the transient model are the same as those of the steady-state model, as the varying time of current is much longer than the relaxation time of plasma...
Based on quasi-steady three-dimensional (3D) model, time-dependent axial magnetic field vacuum arcs (AMFVAs) characteristics in commercial vacuum interrupters for half-wave interruption of power-frequency (50 Hz) current are simulated. 3D spatial distributions of many important plasma parameters and electric characteristics in AMFVAs can be obtained, such as ion number density, ion temperature, electron...
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