Protection of the short network of the ore thermal furnace against short circuits

Novozhilov, T. A.; Novozhilov, A. N.; Kislov, A. P.; Rakhimberdinova, D. M.

doi:10.1063/5.0046557

Cited by 4 publications

(9 citation statements)

References 4 publications

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“…Since operating currents in a high-current system can reach 35-150 kA [7,8], the secondary winding of a furnace transformer is split, and the number of pairs of tube buses in the busbar assembly of a high-current system is equal to the number of these splits. Therefore, a key electrical fault in a furnace transformer is turn-to-turn faults (TF) [9][10][11][12][13][14], and flexible coupling breaks and arc faults (AFs) in splitting circuits [15] predominate in its high-current system.…”

Section: Introductionmentioning

confidence: 99%

“…To protect against an AF between the tube buses of a busbar assembly, all the tube buses are electrically insulated [14]. However, a high-current system usually operates under a high temperature and high content of coal and abrasive dust in the air in ore-thermal plants.…”

Section: Introductionmentioning

confidence: 99%

“…Under these conditions, the insulation of tube buses in the busbar assembly of a high-current system quickly fails, conductive coal dust bridges appear between them, and, finally, a short circuit can occur in a pair of tube buses, and an electric arc can form. This arc can completely damage an expensive busbar assembly in a fraction of a second under operating currents in a furnace [3,14].…”

Section: Introductionmentioning

confidence: 99%

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Buildup of Fault Protection for High-Current Single-Phase Transformers in Ore Furnaces

Rakhimberdinova,

Novozhilov,

Kolesnikov

et al. 2024

Energies

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High-power ore furnaces mainly use single-phase transformers supplied by phase-to-phase voltage with the secondary winding made in the form of four to eight isolated splits and a high-voltage busbar assembly made of the same number of pairs of tube buses. Due to these design features, turn-to-turn faults are the main faults in the primary winding of the transformer, and flexible coupling breaks and arc faults in splitting circuits prevail in the high-voltage system. This is why current and gas protections are currently used to protect transformers against short circuits. However, current protections are insensitive to turn faults, and the gas protection response time can be long since it strongly depends on the oil temperature. High-current systems are protected from arc faults only by insulating tube buses. However, this insulation is gradually destroyed under the impact of abrasive dust in the air, and the presence of coal dust in the air creates conditions for arc faults. There is no protection against breaks in the circuits of pairs of tube buses. The extent of damage in a transformer and its high-current system due to the faults can be significantly reduced by using new protection devices based on the measurements of the longitudinal and transverse asymmetry of the stray magnetic fields of the protected transformer. To implement these protections, this article suggests a method for protecting a transformer and a high-current system using magnetic current transformers (MCTs). The number and points for MCT winding coils are determined through the analysis of their EMF values versus their positions relative to the windings of the transformer operating under different modes. The results serve as the basis for the protection circuit design; the protection response threshold is calculated, the protection operation is described, and the results of the experiment are given.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Buildup of Fault Protection for High-Current Single-Phase Transformers in Ore Furnaces

Rakhimberdinova,

Novozhilov,

Kolesnikov

et al. 2024

Energies

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“…They are metal-intensive, have large errors in transient modes and create a dangerous voltage when their secondary circuits are broken [3]. It is possible to avoid these disadvantages by using other primary transducers to obtain information, such as reed switches [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Determination of changes in the parameters of reed switches in resource-saving relay protection devices of the electrical part of power plants

Neftisov

Talipov

Andreeva

et al. 2022

J. Phys.: Conf. Ser.

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This publication is a continuation of many years of research on the development of the basis for building a unique resource-saving relay protection, which does not use current transformers to obtain information about the primary current. The authors propose to consider the possibility of building relay protection devices with the use of reed switches as sensitive elements. However, an important issue remains the study of reed switches parameters with the passage of time and the number of actuations and returns.

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“…To smooth the ripple of the rectified voltage, capacitive or inductive filters are used [1]. Power accumulation can be carried out only in reactive elements (inductors or capacitors) [2][3], so the filter must contain at least one such element. The need for a filter is due to the fact that the instantaneous alternating voltages power pulsates with time, while the instantaneous direct voltages power is constant.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Operating Parameters of Rectifier Devices Using Modern Software Tools

Sarinova

Drobinsky

Kirichenko

2022

J. Phys.: Conf. Ser.

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Rectifier devices that convert alternating voltage into constant voltage are widely used in the energy industry. Laboratory studies allow us to obtain results showing the nature of the time dependencies of the operating parameters of rectifier devices. In this regard, the use of software tools allows for a more accurate, less time-consuming construction of time diagrams of the operating parameters of rectifier devices.

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Protection of the short network of the ore thermal furnace against short circuits

Cited by 4 publications

References 4 publications

Buildup of Fault Protection for High-Current Single-Phase Transformers in Ore Furnaces

Buildup of Fault Protection for High-Current Single-Phase Transformers in Ore Furnaces

Determination of changes in the parameters of reed switches in resource-saving relay protection devices of the electrical part of power plants

Investigation of the Operating Parameters of Rectifier Devices Using Modern Software Tools

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