Shielded busbars - QuickField simulation example
A three phase shielded busbar carries alternating current. The busbar conductor consists of 2 halves. This simulation example is prepared by Dr. Ioan Popa as a part of the webinar Analyse d'un système de jeux de barres blindés à l'aide du logiciel QuickField.
How to find three-phase busbar losses versus frequency?
Answer Typical applications Geometry
Given
Task
Solution
Results
Reference
Engineering question
Set up a plane-parallel QuickField AC Magnetics problem for three-phase busbars and evaluate frequency-dependent losses from computed field results.
three-phase busbars, industrial power busbars, switchgear busbar systems
Download
Simulation problem
Problem Type
Plane-parallel multiphysics problem of AC Magnetics coupled to Heat transfer.
Material of the busbar and shields is aluminum. Aluminum electrical resistivity is 0.0265 Ohm*mm²/m, temperature coefficient is α=0.00429 1/°C.
AC current I = 10 kA (r.m.s. value), frequency f = 50 Hz.
Calculate the forces and Joule heat in busbars and shields. Calculate the temperatures.
As the conductors resistance depends on the temperature we specify the electrical conductivity at the anticipated temperatures: 80° for bars and 50° for shields.
In thermal problem we cannot simulate the motion of the air. We exclude the air from the model and specify convection boundary condition on conductor surfaces.
Current in the shield is 14.3 kA (magnitude), Joule heat loss is 203 W per 1 meter of shield length. Force acting on a busbar half conductor is 14.7 N per 1 meter of conductor length, Joule heat loss is 108 W.
Ioan Popa, Marian Ciontu, Alin-Iulian Dolan. QuickField Analysis of a Three-Phase Encapsulated Busbars System. Annals of the University of Craiova, Electrical Engineering series, No. 37, 2013; ISSN 1842-4805.
Related examples