Simulation Analysis of High-Voltage SF6 Circuit Breakers with Self-Energy for Breaking Large Current
High-voltage SF6 circuit breakers play a significant role in the power grid,known for their small size and strong breaking capacity.The process of extinguishing the arc in the arc extinguishing chamber during high current interruption is a focus of research in various countries around the world,and it is also the main basis for optimizing,repairing,and debugging the arc extinguishing chamber of circuit breakers.Based on the two-dimensional arc dynamic model,an arc simulation model was established using FLUENT18.0 to simulate the breaking current of 35.36 kA.Through finite element analysis,the distribution of temperature,pressure,velocity,and potential during the breaking process was fully grasped.In simulation analysis,China obtained the law of arc flow velocity changing with temperature for the first time.When the pressure difference downstream of the thermal spray chamber and large and small nozzles reached 405 300 Pa,the maximum flow velocity of the arc reached 9 024 m/s,and the pressure difference reached 101 325 Pa.The arc flow velocity increased significantly,reaching 1 373 m/s,which is very close to the results calculated by LS FROST theory.It has important theoretical significance in the development process of self-energy SF6 circuit breaker arc extinguishing chambers.
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