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Electric arc furnace transformer short circuit

Short circuit experiment refers to the standard test of transformers. In the short-circuit mode the secondary winding leads are short-connected and the voltage source is adjusted to provide the rated current in the primary winding.

Problem type:
Plane-parallel problem of AC Magnetics.

Geometry:
Core depth Lz = 292 mm.
Core Phase A Phase B Phase C А+ А- -a +a B+ B- -b +b C+ C- -c +c 292 mm 1424 mm 1226 mm

Initial data:
Rated voltage of the primary winding U = 6 kV;
Rated current of the primary winding I = 25 A;
Frequency f = 50 Hz;
Winding connection scheme Δ-Δ

Task:
Estimate the transformer short circuit voltage, axial forces in the windings, build the stray fluxes field picture.

Solution:
The winding connection scheme is formed with the help of a connected electrical circuit.
Current source of rated magnitude is connected to the primary winding. Measured voltage drop on the source shows the short circuit voltage.

Results:
Short circuit voltage is 377 V, which is 377/6000 = 6% of the rated voltage value.

Stray fluxes field in the electric arc furnace transformer:

Stray fluxe field in windings

Axial force acting on the end coil of high-voltage winding is 18 N.

Download simulation files (files may be viewed using any QuickField Edition).