Electric arc furnace transformer short circuit
Short-circuit voltage, winding forces and stray leakage flux of an electric arc furnace transformer under short-circuit test conditions.
How can the short-circuit voltage and leakage flux of an electric arc furnace transformer be computed?
Use AC Magnetics coupled with an external circuit to simulate the short-circuit test, then compute the voltage drop at the source and the stray magnetic field.
- Arc furnace transformers
- Heavy-duty transformers
- Transformers for industrial furnaces
Simulation Problem
- Problem Type
- Plane-parallel AC Magnetics
- Geometry
- Core depth Lz = 292 mm, overall 1424 mm × 1226 mm, three-phase core-type structure.
- Given
- Primary winding rated voltage U = 6 kV
- Primary winding rated current I = 25 A
- Frequency f = 50 Hz
- Winding connection Δ-Δ
- Task
- Estimate the transformer's short-circuit voltage and the axial force on the windings, and plot the stray leakage field distribution.
- Solution
The winding connection is implemented through a connected external circuit.
A current source at the rated amplitude is connected to the primary winding, and the voltage drop measured at the source is the short-circuit voltage.
- Results
Short-circuit voltage 377 V, or 377/6000 = 6% of the rated voltage.
Axial force on the end coils of the high-voltage winding: 18 N.
