Cylindrical fuse operation time - QuickField simulation example
This is an example of the safety fuse simulation, performed with QuickField software.
How to find fuse heating during short-circuit conditions?
Answer Typical applications Geometry
Given
Task
Result
Engineering question
Set up a plane-parallel QuickField Multiphysics problem for a cylindrical fuse and evaluate heating under fault-current conditions from computed field results.
cylindrical fuses, short-circuit protection devices, fuse elements
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Simulation problem
Problem Type
Axisymmetric multiphysics problem of DC conduction coupled to Transient heat transfer.
Conductor diameter: 0.2 mm;
Rated current I0 = 5 A.
Fault current I = 20 A.
Ambient air temperature T0 = 20 °C;
Conductor melting point T = 240 °C;
Quartz sand thermal conductivity λ = 0.3 W/m-K.
Determine the cylindrical fuse operating time.
Fuse resistance 0.041 Ohm. The temperature will reach conductor melting point 0.5 seconds after the fault.
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