磁脱扣器动作响应分析及储能电容匹配设计

Tripping response analysis and capacitor matching design of magnetic release

驱动电路与磁脱扣器是电磁式漏电保护器的核心组件,磁脱扣器需与储能电容匹配。在电磁式漏电保护器基本工作原理分析的基础上,建立磁脱扣器的数学模型与有限元计算模型,根据激磁安匝变化进行衔铁响应状态分析,仿真不同线圈激励形式下磁脱扣器动作响应状态。研究衔铁角动量与角位移变化特征,根据无激励时衔铁释放临界角动量与角位移关系,确定不同线圈激励形式下的衔铁临界释放条件。研究电容电压激励源下衔铁所受力矩冲量的变化规律,分析电容及其储能对衔铁释放响应状态的影响,根据临界储能最小的原则确定电容匹配,可以降低衔铁可靠释放所需储能。通过对磁脱扣器样机进行实验测试,验证了理论分析与仿真计算的正确性。

The driving circuit and magnetic release are the core components of electromagnetic residual cur⁃rent device.The magnetic release and energy storage capacitor should be well matched.The mathematical model and finite element calculation model of the magnetic release are established based on the analysis of basic operating principle of the residual current circuit device,the armature response states are analyzed according to the change of the exciting ampere turn,and the action response states of magnetic release under different coil excitation modes are simulated and analyzed.The variation characteristics of armature angular momentum and angular displacement are studied,and the critical release criterion of armature under different coil excitation modes is determined,which is based on the relationship between the critical angular momentum and the angular displacement of the armature without excitation.The variation law of the moment impulse of the armature under the excitation of the capacitor voltage is studied,and the influence of the capacitor and its energy storage on the armature release response states is analyzed.A capacitor matching is deter⁃mined according to the principle of minimum critical energy storage,which can reduce the energy storage required for reliable release of the armature.The correctness of theoretical analysis and simulation calcula⁃tion is verified by the experimental test of the magnetic release.