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transmission line FEA simulation, short circuit current magnetic field

Phase to phase fault is one of the most widespread damages of the transmission lines in electrical networks (15-20 % from total number of failures). This model shows how to simulate the phase to phase fault in QuickField.

**Problem Type**

Plane-parallel problem of transient magnetics.

**Geometry**

Aluminum Conductor Steel Reinforced (ACSR):

Line-to-line short circuit:

**Given**

Rated voltage (RMS) *U*_{rated} = 110 kV;

Rated current (RMS) *I*_{rated} = 440 A;

Line length *l* = 20 km;

Loading parameters *R*_{load} = 100 Ohm;
*L*_{load} = 0.23 H.

**Task**

Determine the transient process currents after a short circuit occurred. Find the electromagnetic forces acting on the lines during this process.

**Solution**

To solve this problem it is necessary to simulate both field part and circuit part. The scheme of connection of power supply phase windings, loading, elements of the circuit and short-circuit bridge is presented in the circuit model, created by the QuickField Circuit Editor.

Short-circuit bridge is a QuickField block with the resistance which varies in time. This dependence is implemented using the electrical conductivity as a function of the temperature, which is also function of time - as σ(*T*(t)) function.

**Results**

Short-circuit current (amplitude) *I*_{max} = 7000 A.

Electromagnetic force of interaction between phases *A* and *B* *F*_{A-B} = 1780 N/km.

Illustration of the short-circuit currents in the transmission line:

- Video: Phase to phase fault

- Watch online on YouTube.
- View simulation report in PDF
- Download simulation files (files may be viewed using any QuickField Edition).