快速直流断路器中操动机构的仿真研究

直流输电电压等级的提高使之研制出相应的直流开断装置意义重大;而断路器操动机构的可靠性直接影响着其开断性能。笔者针对直流开断装置中断路器的操动机构展开研究,建立了一种基于电磁驱动、永磁弹簧保持的电磁斥力机构仿真模型,对其电磁-结构耦合过程和电磁-机械运动耦合过程进行了分析。仿真结果表明:当分闸电容的充电电压为4000 V时,电磁斥力机构的电磁斥力峰值约为128 kN,金属盘的平均速度能达到3.7 m/s。金属盘的应力峰值出现在靠近驱动轴一侧(内侧),并从内侧至外侧逐渐减小。进一步设计并研制了实验样机,并通过实验对仿真结果进行了验证,两者具有较好的一致性。

Simulation Study of Operation Mechanism in High-speed DC Circuit Breaker

The improvement of DC transmission voltage level makes it important to develop corresponding DC interrupting device,and the reliability of circuit breaker’s operation mechanism directly affects its interruption performance.In this essay,the operating mechanism of the circuit breaker in the DC interrupting device is researchedand a simulation model of the high-speed operating mechanism which is driven by electromagnetic repulsion force and held by permanent magnet and spring is proposed to analyze the electromagnetic-structural coupling process and electromagnetic-mechanical coupling process of the electromagnetic repulsion mechanism(ERM).The simulation results show that when the charging voltage of switching capacitor is 4000 V,the electromagnetic repulsion force of the ERM is about 128 kN,and the average speed of the metal plate can reach 3.7 m/s.The stress peak of the metal plate occurs near the inside of the driving axis and decreases gradually from the inside to the outside.Furthermore,a prototype of the ERM is designed and developed,and the simulation results are verified through experiments.The two results have good consistency.