Safety fuse temperature - QuickField simulation example
This is an example of the safety fuse simulation, performed with QuickField software.
How to find temperature rise in safety fuse element?
Answer Typical applications Geometry
Given
Task
Solution
Result
Engineering question
Set up a plane-parallel QuickField Transient Heat Transfer problem for a safety fuse element and evaluate temperature rise from computed field results.
safety fuse elements, cartridge fuses, thermal protection fuses
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Simulation problem
Problem Type
Plane-parallel problem of heat transfer.
Conductor diameter is d = 0.5 mm, copper resistivity ρ = 0.018 Ohm*mm²/m;
Copper melting point T = 1050 °C;
Nominal current I = 10 A, ambient air temperature +20°C.
Determine the operating time at short-circuit current of 100 A.
First we need to calculate the power loss in the conductor. Conductor resistance is R = ρ*Length / Cross-section area.
The losses in the conductor are defined by the Joule-Lentz law as Q = I²R.
In QuickField we should specify the value of losses per volume: Q / V = I²R / (Length*Cross-section area) = I²*(ρ*Length / Cross-section area) / (Length*Cross-section area) = ρ * (I/Cross-section area)².
Conductor cross-section area is πd²/4 = 0.196 mm².
Fuse will terminate the current in less than 2 seconds.
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