【摘要】 真空断路器广泛应用于中压电力系统中，利用触头线圈产生的磁场调控真空电弧是提高真空断路器开断能力的重要手段，然而目前的设计方法没有综合考虑阴极斑点动态运动与触头线圈磁场的耦合效应，影响其设计准确性和精度。本文建立了考虑阴极斑点与磁场耦合关系的触头磁场计算模型，根据阴极斑点分布计算触头间隙控制电弧的磁场，并由磁场推进阴极斑点运动。在四分之一匝线圈式触头下，分析了阴极斑点分布对触头磁场的影响，对比了考虑耦合关系对触头磁场计算结果造成的差异。仿真结果表明，在阴极斑点的初始扩散阶段，纵磁变化不明显，而横磁随阴极斑点扩散而变化；稳定燃弧时，考虑耦合关系与否的纵磁最大差值可达纵磁最大值的24.1%。本文所建立的模型以及计算方法为真空灭弧室触头提供了一种新的设计思路与方法。更多还原

【Abstract】 Vacuum circuit breakers are widely used in medium voltage power systems. Using the magnetic field generated by contact coils to regulate vacuum arcs is an important means to improve the breaking capacity of vacuum circuit breakers. However, the impact of cathode spot dynamic characteristics on the contact magnetic field has not been considered in current contact design methods, leading to low accuracy and low precision. A contact magnetic field calculation model considering the coupling relationship between cathode spots and magnetic fields is established. In which the distribution of cathode spots is used to calculate the gap magnetic field, and the movement of cathode spots is driven by the magnetic field. Under a quarter turn coil type contact, the influence of cathode spot distribution on the contact magnetic field is analyzed, and the difference between the magnetic field results calculated with and without coupling relationship are compared. The simulation results indicate that during initial diffusion stage of the cathode spot, the axial magnetic field does not undergo significant change, whereas the transverse magnetic field varies with the diffusion of the cathode spot; during stable arcing, the maximum difference in axial magnetic field considering the coupling relationship can reach 24.1% of the maximum axial magnetic field. The model and the calculation method provide a new design approach for vacuum interrupter contacts.更多还原