Winding stress assessment method based on three-dimensional electromagnetic coupling model of transformer
A three-dimensional electromagnetic, coupled model technology, applied in instruments, electrical digital data processing, special data processing applications, etc., can solve the problems of reduced short-circuit resistance of windings and increased wire stress.
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[0049] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0050] A winding stress evaluation method based on a transformer three-dimensional electromagnetic coupling model of the present invention comprises the following steps:
[0051] 1) Finite element calculation of transformer leakage field
[0052] The transformer leakage magnetic field is calculated based on the vector magnetic potential nodal finite element method. The vector magnetic potential nodal finite element method uses the vector magnetic potential A, ignores the hysteresis effect and the eddy current effect, and obtains the nonlinear magnetic field equation of the transformer according to the Maxwell equation:
[0053] ▿ × 1 μ ▿ × A = J - - - ( 1 )
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