Inductive fault current limiter - QuickField simulation example
This simulation example is prepared by Professor James R. Claycomb as a part of the webinar Fault Current Limiter Simulations using QuickField.
How to find fault current limitation using inductive superconducting devices?
Answer Typical applications Geometry
Given
Task Solution
Results
An inductive superconducting current limiter utilizes the fact that a superconductor becomes a normal conductor at some critical value of magnetic flux density. Below the critical value the superconductor effectively screens the secondary winding. When the fault occurs, the current increases many times and its magnetic field causes the superconductor to come to a normal state.
Engineering question
Set up an axisymmetric QuickField AC Magnetics problem for an inductive superconducting device and evaluate fault current limitation from computed field results.
inductive fault current limiters, superconducting current limiters, magnetic core limiters
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Simulation problem
Problem Type
Axisymmetric problem of AC magnetics.
Conductor diameter is 1 mm, copper conductivity 59.6 MS/m.
Voltage source 120 V (r.m.s.), frequency 60 Hz.
Calculate the fault current.
Superconductor layer is modelled as an infinitively thin layer with a zero magnetic potential boundary condition.
A maximum possible fault current magnitude is 549 A. The fault current limiter reduces fault current magnitude to 508 A.
Left picture shows the case, when the superconductor is in the superconducting state and fully screens off the secondary winding. Right picture shows a case when the superconductor is in a normal state.
Video
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