Contact geometry evaluation using a full 3D Magneto-Hydrodynamic vacuum arc model is presented. The 3D model uses a two-step approach. The time dependent magnetic field is calculated by Flux3D® using the features of the arc control in axial magnetic field (AMF) type vacuum interrupters (VIs). The arc is modeled by a single fluid description of the arc plasma in Fluent®. Current flow is addressed by Ohms law. The model is applied to 3 contact geometries used in commercial AMF VI’s. The general results of the model like ion density, flow fields and energy flow are represented. It is demonstrated that the external transverse magnetic field created by neighboring phases in a circuit breaker causes off-axis deflection of the heat flow to anode. The deflection in the anti-Amperian direction is attributed to the boundary condition of the current flow at the cathode side.

No abstract

No abstract

In view of the unstable power conversion of the existing wave power generation plant, the high cost of grid-connected power generation and the difficulty of maintenance, a self-sailing wave energy collection device based on the hydrogen storage of sea hydropower is designed. The device can sail to the wave energy-rich area by self-sailing unmanned carrier and can temporarily return to the coast in bad weather. In order to reduce the resistance of the device and improve the efficiency of wave energy collection, a folding integrated wave energy capture device is designed, and when it is captured by wave energy, the wave kinetic energy capture module and the wave potential energy capture module on the device will simultaneously collect the kinetic and potential energy generated by the wave, and when the unmanned carrier sails, the wave energy capture device will automatically be recovered on both sides of the hull. Because the power stability of wave energy conversion is weak, such as direct input into the power grid, will affect the stability of the power grid, the device through the sea hydropower de-hydrogen system, the collected wave energy into hydrogen energy and storage, improve the wave energy storage capacity, and effectively solve the problem of weak power stability of wave energy conversion.