Numerical modeling of three-phase busbar systems: Calculation of the thermal field and electrodynamic forces

Abstract

The paper presents numerical models obtained in QuickField software for analysis of the three-phase systems of rectangular busbar, of low or medium voltage, in steady-state and in short-circuit regime. Using a magnetic harmonic model coupled with a steady-state thermal model, the distribution of the thermal field for rated current is determined. By coupling the thermal steady-state model for the rated current and the magnetic model for short circuit current with a thermal model in transient regime, can be determined the time evolution of the temperature distribution in the short circuit regime (undeveloped in this paper). For determining the electrodynamic forces, a transient magnetic model is used. Different types of busbar systems are analyzed, with one or more conductors per phase in aligned arrangement.