Direct-current magnetic bias calculation method for extra-high voltage transformer parallel winding series resistance compensation
A technology of series resistance and DC bias, applied in design optimization/simulation, etc., can solve problems such as increased DC component of calculation current, large voltage on large inductors, and DC current return, so as to ensure accuracy and increase resistance value , the effect of shortening the transition process
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[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings, but the claims of the present invention are not limited in any way.
[0048] Step 1. According to the actual structural parameters of the transformer, construct a three-dimensional solid model of the transformer, and use the edge finite element method to establish a magnetic field model for DC bias calculation of the transformer.
[0049] The edge element method takes the magnetic vector A as the state variable, assumes that the magnetic medium is isotropic, and obtains the nonlinear magnetic field equation inside the transformer according to the Maxwell equations:
[0050]
[0051] Among them, μ is the permeability of the magnetic medium, m / H; A is the vector magnetic potential, Wb / m 2 ; J is the current density, A / m 2 ; Calculated for curl.
[0052] The degree of freedom of the edge element is the ring A of the field vector along the edge l l , using ...
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