Fuse current limiter - QuickField simulation example
Engineering question
How to calculate the temperature of the fuse?
Answer
First solve DC conduction for current density and Joule losses, then transfer the losses to the 3D steady-state heat-transfer model and calculate the fuse temperature.
Typical applications
fuse current limiter elements, current-limiting fuses, protection fuse links
Download
- Download simulation files (files may be viewed using any QuickField Edition).
Simulation problem
Problem Type3D multiphysics problem of DC conduction coupled to Heat Transfer.
Geometry
Given
Electrical conductivity of the copper σ = 56 MS/m
Rated current I = 100 A
Thermal conductivity of the porcelain body = 2 W/K-m
Ambient air temperature T = +20°C.
Task
Calculate the temperature of the fuse
Solution
First the Fuse temperature during high-current operation, combining current distribution and Joule heating to evaluate thermal behavior of the current-limiting element.. Then heat transfer problem is simulated.
Result
Current density distribution in the fuse.
Losses distribution: terminals 0.27W, fuse 1.9W, sticker 0.55W.
Temperature distribution in the fuse current limiter. Fuse central part temperature is 48°C.
Video
- Fuse current limiter. DC conduction
- Video: Fuse current limiter. Heat transfer. Watch on YouTube