Arc Fault Protection of the High-Current Busbar Assembly of an Ore Furnace

Dilara Rakhimberdinova (), Aleksandr Novozhilov, Evgeniy Kolesnikov, Oksana Andreeva, Olzhas Talipov and Aleksandr Kislov
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Dilara Rakhimberdinova: Electrical Engineering and Automation Department, Toraighyrov University, Lomov Str. 64, Pavlodar 140008, Kazakhstan
Aleksandr Novozhilov: Electrical Engineering and Automation Department, Toraighyrov University, Lomov Str. 64, Pavlodar 140008, Kazakhstan
Evgeniy Kolesnikov: Electrical Engineering and Automation Department, Toraighyrov University, Lomov Str. 64, Pavlodar 140008, Kazakhstan
Oksana Andreeva: Electrical Engineering and Automation Department, Toraighyrov University, Lomov Str. 64, Pavlodar 140008, Kazakhstan
Olzhas Talipov: Electrical Engineering and Automation Department, Toraighyrov University, Lomov Str. 64, Pavlodar 140008, Kazakhstan
Aleksandr Kislov: Electrical Engineering and Automation Department, Toraighyrov University, Lomov Str. 64, Pavlodar 140008, Kazakhstan

Energies, 2023, vol. 16, issue 23, 1-14

Abstract: The design features of high-power ore furnaces are the transformer’s secondary winding made of 4–8 isolated splits and a busbar assembly made of the same number of paired bifilar bus tubes, spaced 20–40 mm apart. Only an arc fault (AF) can occur between paired bus tubes in such an assembly, during which the assembly with currents of 35–150 kA can be completely destructed. To protect against AFs, these bus tubes are wrapped in several layers of gluey fiberglass cloth. However, such cloth is abraded under the impact of airborne abrasive dust particles during furnace operation, and coal dust in the air creates the conditions for an AF. A new current protection with a magnetic current transformer (MCT), which prevents busbar assembly destruction, is suggested. Its design is based on the analysis of the distribution of busbar assembly magnetic fields. The choice of MCT position is justified, and parameters of its windings are determined; MCT construction and fastening are described, and a technique for reliable MCT output signal transmission under strong magnetic fields and with a specified protection threshold is suggested. These protections are currently the simplest and cheapest tool for preventing the complete destruction of an expensive busbar assembly in events of AFs during it.

Keywords: ore-thermal furnace; high-current circuit; busbar assembly; bus tube; arc fault; busbar assembly current; magnetic current transformer; discriminating element; current protection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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