A new high speed mechanical contact mechanism was designed based on electro-magnetic repulsion mechanism and permanent magnetic mechanism according to the requirement of new hybrid current limiting circuit breaker. The electro-magnetic repulsion mechanism and the permanent magnetic mechanism acted together to drive the contact to open at high speed when a fault occurs. However, the permanent mechanism could only drive the contact to open and close in normal working conditions. And the contact force in both opening state and close state was also provided by the permanent mechanism. A prototype of high speed contact mechanism rated at 320 V/3 kA was developed. The result of simulation analysis and experiment show that the reaction time of the prototype is 220 μs and the contact spends 7 ms completing 20 mm moving at a velocity is 2. 9 m/s. Other indexes of the prototype also meet the demand of the hybrid current limiting circuit breaker.%针对新型混合型限流断路器对机械触头机构的要求,设计了一种基于高速电磁斥力机构和永磁机构的新型高速机械触头机构.该机构在故障保护时,电磁斥力机构和永磁机构联合动作,驱动动触头快速分闸.永磁机构完成正常工况下触头的分、合闸驱动,并且提供触头在合闸状态的合闸压力及其在分闸状态的分闸保持力.研制了额定320 V/3 kA的高速触头机构样机,对样机进行仿真及试验分析.结果表明:所设计样机初始分离时间为220 μs,动触头完成20 mm行程共用时7 ms,触头平均运动速度为2.9 m/s,其他各项指标也都满足混合型限流断路器要求.
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