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150 - Electrodynamic Repulsion Force Analysis of a Switching Gear |
Module:TR |
2011-02-28 |
The large capacity switching gear indicated in the figure produces electrodynamic repulsion force by the current flowing in the contacts during excitation. Therefore, the contact stress needs to be larger than the electrodynamic repulsion force produced by the maximum excitation current.
This example presents the use of a magnetic field analysis to obtain the electrodynamic repulsion force of a switching gear from the Lorentz force when a short-circuit current of 100 kA is applied.
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149 - Analysis of Magnetic Blowout Force Acting on the Arc of a Switching Gear |
Module:TR |
2011-02-28 |
Metal vapor is produced from the contacts of a switching gear during cutoff and a plasma arc forms. The structure of the contact rings is innovated to produce a magnetic field that expands the arc and prevents vacuum deposition caused by the arc. The arc expands by the Lorentz force that is produced.
This example presents the use of a magnetic field analysis to obtain the current density and Lorentz force of the switching gear and the force expanding the arc.
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84 - Analysis of Electromagnetic Forming
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Module:DP |
2011-01-17 |
Electromagnetic forming is a method of forming where a powerful magnetic
field is created with a large current produced instantly in a coil to cause
deformation in the tube when the eddy currents and magnet fields interact.The
behavior of the deformation in electromagnetic forming is known for being
extremely difficult to analyze because the forming is done in a very short
amount of time, and the dynamic deformation is complicated.In JMAG, the
dynamic deformation can be estimated by evaluating the Lorentz force density
that occurs in the tube.This example analyzes the Lorentz force density
produced in a tube when a current flows in the coil.
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