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Transformers Application Pages

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3-phase Transformer

The model presented here is the simulated results of the ohmic losses and flux density of a 3 phase transformer with a three limbed paramagnetic core. The symmetry in the z-axis has been used to minimize the problem size and accelerate solution time. The coils are made of three concentric layers of different thickness.

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Field Loss in Power Transformer (T.E.A.M. Problem 21)

Presented here is MagNet’s analysis of a power transfomer in which two exciting coils directed in opposite directions and shielded by magnetic steel plates. The simulated nonlinear eddy current and hysteresis losses are compared to measured results.

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Field Loss in Power Transformer (T.E.A.M. Problem 21a)

Presented here is MagNet&r analysis of the second set of configurations from the family of benchmarks involving two exciting coils directed in opposite directions and shielded by a non-magnetic steel plate. The steel plate has four configurations; no slot, one slot, two slots and three slots. The eddy current losses are compared in all configurations to measured results.

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Impact of Materials on Reducing Stray Losses (T.E.A.M. Problem 21b)

This examples involves three different configurations of plates: one magnetic and one non-magnetic plate, two magnetic plates and two non-magnetic plates. The flux density is measured along contours on the plates’ surface and compared with measured results.

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Impact of Shield Thickness on Reducing Stray Losses (T.E.A.M. Problem 21c)

There are two types of shields in this benchmark: one single silicon steel sheet or copper plate (M1 or EM1), or three separated silicon steel sheets or plates M2 or EM2). The transformer wall is made out of magnetic steel.

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Ohmic losses in transformer clamping plates

Calculating stray losses in power transformer tanks and clamps is an important design characteristic to consider. However the standard approach requires modeling skin effects in 3D which requires a very fine mesh. This can significantly increase the solution time making the simulation impractical to perform at times. Using the proprietary formulation of the non-linear Surface Impedance boundary condition (SIBC) that is unique to MagNet, very accurate non-linear loss predictions can be achieved in time-harmonic context without the cost of using fine 3D meshes.

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Power Transformer Failure and Challenges in the Transformer Design

Transient overvoltages due to lightning strikes, switching operations in circuit breakers and ferro-resonances can cause a non-linear voltage distribution over the transformer windings, high field strengths between turns, and eventually lead to destruction of the winding insulation. (This was originally presented at Engage 2015).

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Slot Configurations for Reducing Stray Losses (T.E.A.M. Problem 21a)

This example involves four different configurations of shielding steel plate: a plate with no slots, one slot, two slots, and three slots. The magnetic field density is measured along contours on the surface of the plate, and compared with measured results.

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