Abstract
High-speed circuit breaker can significantly shorten the breaking time and reduce the impact of short-circuit current, which is of great significance to the safe and stable operation of power grid. 252kV high-speed circuit breaker is taken as the research object, the design scheme of solid and hollow static arc contacts is proposed, the electric field distribution of arc extinguishing chamber is optimized, and the optimal relative position of moving end shielding cover and moving arc contacts is determined. The flow field under the condition of 50kA is studied in the model of arc chamber after electric field optimization. The results show that the maximum electric field intensity between hollow contacts is greater than that between solid contacts under the same opening distance, so solid static arc contacts should be adopted. The relative displacement of the moving shield cover and arc contact is determined to be 35mm as the best shielding scheme. the maximum pressure in the arc extinguishing chamber is 2.33Mpa and the maximum temperature is 26126K during arc burning, which appear on the surface of static arc contact. The results can provide a theoretical basis for the mechanism design and breaking characteristics of high-speed circuit breaker.
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