Cylindrical fuse operation time - QuickField simulation example
This is an example of the safety fuse simulation, performed with QuickField software.
How to calculate the cylindrical fuse operating time?
Answer Typical applications Geometry
Given
Task
Result
Engineering question
Couple DC-conduction Joule losses to transient heat transfer and take the time at which the fuse element reaches its melting temperature as the operating time.
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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