Multi-Conductor Transmission Line Model of Split-Winding Transformer for Frequency Response and Disk-to-Disk Fault Analysis

Abstract

For transformer designers, split-winding transformer modeling in different frequency ranges is of great importance. In this paper, for the first time, a multi-conductor transmission line model is proposed for high-frequency modeling of the split-winding transformer. In this model, all the turns in layers and disks have been considered and the model's parameters have been calculated using the finite element method. In order to validate the proposed model, the results are compared with the result of a model, which is based on finite element and coupled field-circuit. It is shown that the introduced model has good accuracy and it can be employed for split-winding transformer modeling in different frequency ranges. In addition, using the validated multi-conductor transmission line model, the frequency response of the split-winding transformer and disk-to-disk short circuit fault are analyzed.

Analysis of Turn-to-Turn Fault on Split-Winding Transformer Using Coupled Field-Circuit Approach

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“…When the TTF occurs, there are increased magnetic flux leakage, core saturation and winding overcurrent in the transformer [3,4], causing a critical mechanical stress, and resulting in deformation of the winding shape [5][6][7]. Additionally, the strong local magnetic field generated by the TTF current distorts the magnetic field in the core and space, which affects the normal operation of the other windings through magnetic coupling relations [8,9]. Therefore, split-winding transformers require special short-circuit designs to take these factors into account, while obtaining these influence laws is also an important prerequisite for the design of split-winding transformers.…”

Development of a Non-Iterative Macromodeling Technique by Data Integration and Least Square Method

“…The coupled structures are widely used in microwave engineering [32][33]. As the fourth example, a coupled microstrip line using TLY062 substrate with relative permittivity of 2.2, the thickness of 1.56 mm, and loss tangent 0.009 is considered [34].…”