Evaluating through mathematical modelling the power equipment busbars electrodynamic strength under sudden short-circuit conditions

¹ University of Craiova, Faculty of Electrical Engineering, Craiova 200440, Romania
² University “Constantin Brancusi” of Targu-Jiu, Targu-Jiu 210135, Romania
³ Technical University of Sofia, English Language Faculty of Engineering, Sofia 1000, Bulgaria
⁴ University of Medicine and Pharmacy of Craiova, Faculty of Medicine, Craiova 200349, Romania
⁵ ENSEIRB MATMECA – Bordeaux INP, Domaine Universitaire 33405 TALENCE, France

^* Corresponding author: abulucea@em.ucv.ro

Abstract

The electrodynamic strength, as forces acting between the current-carrying electric circuits are exerted as long as the currents exist, and have the tendency of deformation and displacement of the circuits. In short-circuit regimes the strength in electrical equipment becomes severe. For instance, short-circuits highly affect power transformers connected to power transmission lines. The effects are also strong because of mechanical deformations occurring in the power transformer connection part. In line with this idea, in this paper it is made an analytical study upon the a.c. single-phase and a.c. three-phase electric circuits, taking into account the current instantaneous maximum value. The paper also entails numerical simulations of electrodynamic strength in power transformer busbars under short-circuit conditions. MATLAB software, with its specific extensions, enable simulation models to generate the charts of the electrodynamic forces in the power transformer connection bars.