Transformer Eddy Current Loss Calculation via 3D Magnetic Field Model
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Solution Overview
Problem
Existing methods for calculating eddy current loss in transformers are inaccurate due to the influence of iron core conductivity, leading to incorrect coil temperature field cloud diagrams, hot spot positioning, service life prediction, and insulation analysis.
Innovation Solution
A method involving the acquisition of basic transformer data to construct a single-phase three-dimensional magnetic field model, calculating average magnetic leakage intensity for each coil layer, constructing an eddy current loss weight function, and calculating eddy current loss using a design calculation sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to calculate eddy current loss, then the calculation process is simple, but the accuracy is poor due to influence of iron core conductivity
Solution Approach 1:
The patent divides the coil into multiple coil layers and further segments each coil layer into multiple micro-volume elements. This segmentation allows the magnetic leakage intensity to be calculated at each specific location rather than using a uniform approximation, significantly improving the accuracy of eddy current loss calculation while maintaining manageable computational complexity through systematic discretization.
Solution Approach 2:
The patent transitions from conventional two-dimensional or simplified one-dimensional calculations to a three-dimensional magnetic field model. By introducing the spatial dimension and calculating magnetic leakage intensity at each coordinate point (x, y, z) within the coil structure, the method achieves more accurate representation of the actual magnetic field distribution, thereby improving eddy current loss calculation accuracy.
2Measurement precision
If inaccurate eddy current loss calculation is used, then the calculation process is fast, but the coil temperature field cloud diagram becomes inaccurate
Solution Approach 1:
The patent performs preliminary calculation of the magnetic leakage intensity distribution throughout the coil structure before proceeding to calculate eddy current loss and temperature field. By pre-computing the magnetic leakage intensity at each micro-volume element and storing it in a lookup table, the subsequent temperature field calculation can be performed more efficiently without needing to recompute the magnetic field distribution, thus reducing overall calculation time while maintaining high accuracy.
3Measurement precision
If inaccurate eddy current loss calculation is used, then the computational load is low, but hot spot positioning becomes inaccurate
Solution Approach 1:
The patent applies local quality analysis by calculating magnetic leakage intensity and eddy current loss at each specific micro-volume element within the coil structure. Instead of using a uniform approximation for the entire coil, the method identifies and highlights specific locations with high magnetic leakage and corresponding hot spots. This localized approach enables accurate hot spot positioning while the computational load is managed through targeted calculations only in critical regions rather than uniform processing of the entire structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides a relatively accurate calculation of eddy current loss, improving the accuracy of coil temperature field cloud diagrams and enabling quick and accurate judgment of transformer hot spots.
Implementation Method 1
calculating eddy current loss of each coil layer in the coil according to a design calculation sheet of the target transformer and the eddy current loss weight function of each coil layer in the coil
Implementation Method 2
calculating average magnetic leakage intensity of each coil layer in a coil of the target transformer according to the single-phase three-dimensional magnetic field model
Data Source
AI summary
Embodiments of the present disclosure disclose a method for calculating eddy current loss of a transformer, a storage medium and a device. The calculated eddy current loss of the transformer obtained by the method is relatively accurate, and the problem that in the relevant art, a coil temperature field cloud diagram under rated capacity of the transformer is influenced by electric conductivity of an iron core, so that the calculated eddy current loss is inaccurate is solved.