Analysis of the influence of the parameters of the power supply network on the operating modes of the electric drives of the stands of the hot rolling mill 1700 of ArcelorMittal Temirtau JSC

Abstract

The finishing group of stands of the 1700 SRS-1 continuous mill of ArcelorMittal Temirtau JSC is characterized by high rolling speeds and high productivity. The use of DC motors as power sources for the main drives of the stands of high-power thyristor converter units significantly affects the nature of the operating modes of the power supply system and the quality of electricity on the buses of the SRS-1 substation. Experiments were performed to study the electricity grid supply substation in which the basic indexes of quality of electric energy and the built waveform voltage SAG during rolling. Voltage dips are observed throughout the rolling process and reach 10% of the rated network voltage. Due to the complexity of removing individual parameters of electric drives and conducting experiments on a real mill, an adequate model of the electric drive of the stand of the finishing group of the 1700 SRS-1 mill was developed and built.

Rolling stand electric drive model regarding influence of power supply network parameters

“…To assess the power supply system state of ArcelorMittal Temirtau JSC SRS-1 1,700 hot-rolling mill some experiments were carried out to study the substation 6 power supply network which provides energy consumption for the mill main drives. The electricity quality main indicators were determined and while being rolled voltage dips register diagram was made in accordance with the experimental studies results of power supply system data of ArcelorMittal Temirtau JSC SRS-1 1,700 hotrolling mill that were obtained due to application of "Resurs-UF2M" [39] energy quality indicators device certified on the territory of the Republic of Kazakhstan [40]. Figure 3 The register analysis indicates that the voltage dips can be observed during the entire rolling process and their average values exceed the maximum allowable values regulated by the 32,144-2,013 adopted state standards (Figure 3) [41].…”