Phase to phase fault - QuickField simulation example
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.
How to find line to line short circuit transient currents and forces?
Engineering answer Typical applications Geometry
Aluminum Conductor Steel Reinforced (ACSR):
Line-to-line short circuit:
Given
Task
Solution
Results
Maximal short-circuit current Imax = 8 kA.
Engineering question
Set up a plane-parallel QuickField Transient Magnetics problem for a line-to-line short circuit and evaluate transient currents and forces from computed field results.
overhead transmission lines, power line conductors, faulted transmission circuits
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Simulation problem
Problem Type
Plane-parallel problem of transient magnetics.
Rated voltage (RMS) Urated = 110 kV;
Rated current (RMS) Irated = 440 A;
Line length L = 20 km;
Loading parameters Rload = 100 Ohm;
Lload = 0.23 H.
Determine the transient process currents after a short circuit occurred. Find the electromagnetic forces acting on the lines during this process.
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 electrical conductivity which varies in time:
σ(t) = 0.01 + 56e6 * STEP(t - 1).
Electromagnetic force of interaction between phases A and B is fA-B = 2.6 N/m.
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