Three phase cable - QuickField simulation example
This is an example of the 3-phase cable simulation, performed with QuickField software. The cable consists of 4 isolated conductors and is buried in the ground.
How to calculate leakage current in a buried three-phase cable?
Answer Typical applications Geometry
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Task
Solution
Result
Engineering question
Assign conductor surface potentials in a plane-parallel AC conduction model and calculate the resulting reactive leakage current.
three-phase underground cables, power cable insulation systems, multicore cable arrangements
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Simulation problem
Problem Type
Plane-parallel problem of AC conduction.
Cable diameter is 80 mm, insulation thickness is 2 mm, shield thickness is 5 mm.
Insulation dielectric permittivity 4, shield dielectric permittivity 2.
AC voltage U = 250 V (peak), frequency f = 400 Hz.
Determine the leakage current.
The conductors' bodies are excluded from the model, as there is no electric field inside conductors. Instead, the electric potentials on conductors' surfaces are specified.
The reactive leakage current is 0.57.. 0.64 mA per 1 meter of conductor length:
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