Vasyl I. Hudym

This article presents the results of the analysis of a six-electrode pulse current electric arc furnace (EAF). The characteristics of a power supply system for an EAF are presented for symmetrical states and the most probable asymmetrical states.

Electrical machines, such as welding arc devices, negatively affect the quality of electric power in a supply network, which in turn affects the operation of loads connected in parallel. The aim of this paper is to present the results of research confirming the positive effect of a passive L-C filter dedicated for welding devices. The paper demonstrates the effectiveness of the filter, which not only helps to reduce the total voltage distortion, but the reactive power compensation as well. The results confirm that installing a passive controlled L-C filter significantly reduces power losses in elements of the power supply network. The conducted research leads the authors to recommend using such filters in electrical arc devices.

In the article based on the fundamental laws of physics and mathematics has been formulated mathematical model to analyze the electromagnetic waveforms in electrical power systems with non-linear loads, such as arc furnaces.

W artykule przedstawiono wyniki aproksymacji temperatury oblodzonego przewodu podczas procesu jego nagrzewania w celu roztopienia osadu. Do aproksymacji wykorzystano sztuczną sieć neuronową (SSN) dwuwarstwową typu feedforward, zaimplementowaną w środowisku Matlab. Uzyskane wyniki aproksymacji są zadowalające, niemniej istnieje możliwość ich polepszenia.

The article presents results of iced wire’s temperature approximation during process of heating this wire to melt ice. This approximation was implemented in Matlab using a two-layer feedforward artificial neural network (ANN). The results of the approximation are acceptable, but it is possible to improve them.

Atmospheric icing on traction lines is very important problem because it causes difficulties of using electric vehicles by people and can result to breaking of traction lines. Heating the wire can preventing atmospheric icing.