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# Vacuum arcing chamber core eddy current finite element analysis model

by：Transmart     2021-01-25
Vacuum arcing chamber core eddy current finite element analysis model is 2019 - 03 - 30 15:05:41 core type longitudinal magnetic poles vacuum arcing chamber structure is shown in figure 1. Figure of move iron core 8, 9 in order to see the electrode structure. When the current flow from conductive rod 1, I turn on the arm on the 2 to contact blade 3, through the contact blade 3 to 4 arc, to contact blade under 5, to turn the arm 6, by conducting rod under 7. Because the electricity flow in the same direction in turn up and down the arms, they produce a magnetic flux will be vertical through the space between the two contact blade, longitudinal magnetic field is produced. Turn the direction of the magnetic field in opposite arm. Figure 1 core type longitudinal magnetic poles vacuum arcing chamber structure calculated with electromagnetic field finite element analysis software of VectorFields ELEKTRA module. The module adopts A minus φ Method to solve the steady eddy current field. When solving the field is divided into two parts, namely the conductive zone and the conductive section. In the conductive section using scalar potential, in conductive area using vector. Figure 2 core type longitudinal magnetic poles vacuum arcing chamber simplifies the calculation model for the longitudinal magnetic field is produced by turn arm and core, and the main thinking of the vortex core, so took a turn only arm and core in the calculation of simplified model, as shown in figure 2. Subdivision mesh figure in the core, not turn arm. Contact in vacuum arcing chamber. The outside of the vacuum arcing chamber is air. In the calculation of a length of 200 mm is cubic form field in which surrounded the contact. Contact is central in are of the cube. When the contactor diameter is 65 mm, is open from 10 mm, the size of the iron core on a three axis is 52 mm conductivity is 7000, conductivity for s / 105 mm. Turn the arm through the peak in 40 ka alternating current. Calculations of the area of the conductive area of vector and the conductive the scalar potential and simplify the scalar potential with the normal component of the magnetic induction intensity B and the continuity of the tangential component of magnetic field intensity H boundary conditions are coupled together.
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