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Material parameters on the effect of eddy current in the vacuum arcing chamber core

by:Transmart     2021-01-17
Material parameters on the effect of eddy current in the vacuum arcing chamber core - 2019 03 - 30 15:05:42 in vacuum arcing chamber held within the finite element analysis model of the iron core eddy current peak for 40 ka, contactor diameter of 65 mm, is open from 10 mm, turn the arm width is 20 mm unchanged, analysis of magnetic permeability and electric conductivity changes affect core eddy current. Core eddy current increases with the increase of permeability. The relative permeability of 1000 and 7000, conductivity for s / 105 mm. When the current peak, relative permeability of 1000 when core eddy current value is relative magnetic permeability to 1 250 times, the eddy current value of relative permeability is 7000 is 1 of relative permeability is 1000. 31 times; When the current through the zero, the relative permeability to 1000 core eddy current value is relative magnetic permeability to 1 18 times, relative permeability of the eddy current value is relative permeability of 7000 to 1000 1. 20 times. Thus it can be seen that iron core eddy current increases with the increase of relative permeability of saturated trend. Basically the core eddy current conductivity increases. Discuss the conductivity of s/s / 104 mm and 105 mm two cases. In the peak current, relative permeability of 1 conductivity for s / 105 mm the eddy current value is the core of the 40 times when s / 104 mm, the relative permeability for the electrical conductivity of 105 s / 1000 mm the eddy current value is the core of 104 s / 2 mm. 2 times, relative permeability of the electrical conductivity of 105 s / 7000 mm core eddy current value of 104 s / 1 mm. 75 times; When the current through the zero, relative permeability of 1 conductivity for the eddy current value of 104 of 105 s/mm s / 5 mm. 48 times, relative permeability of the electrical conductivity of 105 s / 1000 mm core eddy current value of 104 s / 1 mm. 02 times, relative permeability of electrical conductivity of 105 s / 7000 mm the eddy current value is the core of 104 s/mm was 0. 82 times. Thus it can be seen that when the relative magnetic permeability is low, the electrical conductivity of rising can lead to a sharp rise in core eddy current, and relatively high magnetic permeability, core eddy current with the trend of the electrical conductivity has a slow, even in the current time is reduced.
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