Optimization of the Spontaneous Magnetic Field of the Longitudinal Magnetic Contact for TVS

Aiming at the requirement of magnetic field optimization of trigger vacuum switch (TVS) This paper studies the influence of TVS contact structure on its magnetic field distribution. The three-dimensional model of the cup-shaped longitudinal magnetic contact for triggering the vacuum switch is constructed according to the design parameters. Magnetic field simulation is carried out using COMSOL finite element calculation and simulation software. Simulation and comparative analysis of the self-generated magnetic field strength of contacts with different structural parameters. The results show that the contact slot and cup index are positively correlated with the magnetic field strength; the larger the slot length, the higher the maximum value of the magnetic field strength in the center plane of the arc gap; the slot width has little effect on the magnetic field and can be ignored; the angle between the contact planes is negatively correlated with the value of the magnetic field. Obtain the optimal structure for a high-performance TVS design through simulation: the contact adopts six slots and six cup fingers; the slot length is 5mm, the slot width is 0. 45mm; and the angle between the cup fingers and the contact plane is 20°.