Main > Application > Sample problems
Phase to phase fault
Phase to phase fault is one of the most widespread damages of the transmission lines in electrical networks (1520 % from total number of failures). This model shows how to simulate the phase to phase fault in QuickField.
Problem Type:
Planeparallel problem of transient magnetics.
Geometry:
Tangent tower design. All dimensions are in meters.
Wire design
Linetoline 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.
Problem:
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 shortcircuit bridge is presented in the circuit model, created by the QuickField Circuit Editor.
Shortcircuit 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:
Shortcircuit current (amplitude) I_{max} = 7000 A.
Electromagnetic force of interaction between phases A and B F_{AB} = 1780 N/km.
Illustration of the shortcircuit currents:
Download simulation files line_to_line_short.zip.
Download video (AVI file)
Watch online on YouTube.
