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Main >> Applications >> Sample problems >> Transmission line trap
An example of the calculation of the forces and mechanical stresses for the highfrequency line trap at the short circuit current.
Problem Type:
Axisymmetric problem of magnetostructural coupling.
Geometry:
Given:
Current (peak value) I = 12 kA, frequency f = 50 Hz.
Aluminum cable:
crosssection area A = 2 cm^{2}.
conductivity γ= 37 MS/m;
Young's modulus E = 70 GPa;
Poisson's ratio ν = 0.34;
Fiberglass case:
Young's modulus E = 20 GPa;
Poisson's ratio ν = 0.11;
Task:
Determine forces and mechanical stresses in the highfrequency line trap body.
Solution:
The actual springcoil is modelled as a set of circular turns embedded in a fiberglass case. That facilitates 2D axisymemtric simulation.
The solution consists of two stages: the calculation of forces in a magnetic problem, the calculation of mechanical stresses in a mechanical problem. The transfer of forces from magnetic problem to mechanical one is automated using the coupling mechanism.
Results:
Current density distribution in the aluminum cable:
Mechanical stress in the aluminum cable, wave trap deformed shape (zoomed 1000:1) and Ampere force value acting on the ending turn:
Download simulation files (files may be viewed using any QuickField Edition).