Symmetric double line of conductors - QuickField simulation example
This is an example of the symmetric double line of conductors simulation, performed with QuickField software. Two copper square cross-section conductors with equal but opposite currents are contained inside rectangular ferromagnetic coating.
How to find current distribution and impedance in symmetric double transmission lines?
Engineering answer Typical applications Geometry
Given
Task
Solution
The complex impedance per unit length of the line can be obtained from the equation
Z = ΔV / I,
V1, V2 are voltage drops per unit length in each conductor. To obtain a voltage drop, switch to Local Values mode in postprocessing window, and then pick an arbitrary point within a conductor.
To obtain power losses in the coating:
Results
Current density in symmetric double line of conductors:
Engineering question
Set up a plane-parallel QuickField AC Magnetics problem for symmetric double transmission lines and evaluate current distribution and impedance from computed field results.
twin transmission lines, parallel overhead conductors, double-line conductor systems
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Simulation problem
Problem Type
Plane-parallel problem of AC magnetics.
Magnetic permeability of air μ = 1;
Magnetic permeability of copper μ = 1;
Conductivity of copper σ = 56 MS/m;
Magnetic permeability of coating μ = 100;
Conductivity of coating σ = 10 MS/m;
Current in the conductors I = 1 A;
Frequency f = 100 Hz.
Determine current distribution within the conductors and the coating, complex impedance of the line, and power losses in the coating.
We assume that the flux is contained within the coating, so we can put a Dirichlet boundary condition on the outer surface of the coating.
where ΔV = V1 - V2
The impedance of the line Z = 0.000484 + i 0.000736 Ohm/m.
The power losses in the coating of the double line P = 0.0000427 W/m.
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