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Catalogue

Transformers for arc steel-melting furnaces

Transformers for power supply of electric arc steel-melting furnaces (EAF) are available for furnaces of "small" capacity from 0.5 to 12 tons and furnaces of "large" capacity from 25 to 200 tons. Transformers for furnaces  of "small" capacity  are installed in foundry or other smelter machine-building enterprises and have primary voltage 6 or 10 kV; identical design of the magnetic system and windings; one kind of voltage regulation (NLTC) by tap changing in the HV winding; built-in current-limiting reactors to protect against operating   short-circuit; different types of cooling.

Transformers for furnaces of "big" capacity equip main arc-furnace shops of metallurgical plants. They are executed for   primary voltages from 10 to 220 kV; they have LV control scheme  only on load (OLTC),sometimes with the help of  separate regulating transformers and cooling system with forced circulation of water and oil (type C).
Transformer type Номинальная мощность, кВА Номинальное напряжение НН, В Количество ступеней Примечание
ЭТПМК-2000/10 1250-618 225-111 10
ЭТМПК-2500/10 1600 220-102 10
ЭТМПК-3000/10 2000-1045 243-126 10
ЭТМПК-4000/10 2500 230-95,4 10
ЭТЦПК-4500/10 3100-2020 170-111
ЭТЦПК-6300/10 4000-1385 281-144
281-118
10
ЭТЦПК-6300/10 4500-2310 281-144 10
ЭТЦПК-7500/10 5000-2570 281-144 10
ЭТЦПК-10000/10 7600-3200 261-110 10
ЭТЦПК-13000/10 8000-3600
8000-3200
318-122 10
ЭТЦПК-13500/10 9000-3800 317-,5-134 10
ЭТЦН-26500/35 20000-18000
11550-10400
620-442,4
358-255,4
23
ЭТЦНК-31500/35 20000-16700
11550-9640
620-412
358-238
17
ЭТЦН-60000/35 40000 13
ЭТЦНК-160000/35 80000 745-262 33

Converter transformers

According to the purpose and scope of application, converter transformers are divided into transformers for: DC electric drives, exciters of synchronous generators, rectifiers and inverters of electrified railways, DC arc furnaces, electro thermal installations, electric drives of drilling rigs, frequency converters, cell plants, electrographic furnaces, electrochemical Installations.

Converter transformers are manufactured in the following versions: two and triple-wound, 6-, 12- and 24-phase bridge rectification circuits, with split windings and without splitting, with OLTC or NLTC with different depth of regulation, and also with an equalizing reactor. Rated power of oil converter transformers, at present, varies from 1 to 110 MVA with the supply voltage of 6, 10, 35, 110 kV.
Transformer type Rated power PW, kVA Rated voltage PW, V Rated voltage of converter, V Rated current of converter, А
ТАДЦНПФ-50000/35 32520 35000 450
ТДНП-32000/10 17200 10500 600
ТЦПВ-9540/10 2х4770 10000 155

Transformers for ore-smelting furnaces

Ore-smelting electric furnaces have the widest range among electrometallurgical units due to a large variety of brands of manufactured commercial products and implemented technologies (only electric resistance furnaces have a wider nomenclature). Regenerative processes in the furnaces require low secondary voltages and high currents.

In addition, depending on the smelted material, it is necessary to change the operating regime of the furnace, i. e., to regulate voltage and amperage in wide ranges. The company "Delta Trafo" produces a wide range of transformers for ore-smelting furnaces for different purposes: single-phase and three-phase,   primary voltages 6-220 kV, with NLTC or OLTC voltage regulation and power range from 500 kVA to 100 mVA.

Transformer type Номинальная мощность, кВА Номинальное напряжение НН, В Количество ступеней Примечание
ЭОДЦНА-10000/10 5500 492-253 33
ЭОЦНВР-12500/10 7500-6060 230-151,5 17
ЭОЦНР-12500/10 7500-6080 230-152 19
ЭОЦНВР-12500/10 9200-7450 230-154,5 17
ЭОЦНВР-12500/10 9200-6830 204-154,5 19
ЭОЦНВР-12500/10 9200-6840 230-152 19
ЭОЦНР-14100/10 10000-6413 230-132,5 19
ЭОЦНР-14300/10 10000-6830 230-140 17
ЭОЦНР-14300/10 10000-6216,5 230-128,5 17
ЭОЦНКР-16000/10 9200-5512 206-106 33
ЭОЦНК-16000/10 9200-7020 204-135 17
ЭОЦНК-16000/10 9200-7330 225-151,5 17
ЭОЦНВР-20000/10 13000-7320 269-148 33
ЭОЦНКВР-25000/10 14000 235-136 33
ЭОДЦНК-83300/220 26700-12566 375-125 33
ЭТЦПР-8300/10 5000 200-120 5
ЭТЦНР-10000/10 7000 102-161
204-322
5
ЭТЦП-10000/10 7500 381-268,5 5
ЭТЦП-10000/10 8500-6960 221-181 5
ЭТЦНВР-11000/10 8500-5650 210-139,5 9
ЭТЦНВР-12000/10 9000-6500 196-133,5 17
ЭТЦП-12500/10 7500-6500 230-180 5
ЭТЦНР-13500/10 7500-6542 330,6-171,7 19
ЭТЦПР-15000/10 10500 180-141 9
ЭТЦНР-20000/10 8000 260-105,5 10
ЭТЦНВР-22000/10 14310-7185 196,7-98,8 33
ЭТЦНВР-31500/10 22000-13856 232,6-33,3 33
ЭТЦНКР-42500/10 29000-20083 223,6-134 33

Transformers for induction furnaces

Due to the fact that induction channel, crucible furnaces and mixers of different capabilities and   capacities are widespread, it was required to create a new series of special electric-furnace transformers. Induction furnaces are used for smelting of ferrous and nonferrous metals and their alloys, for metal overheating before casting and alignment of its chemical composition, doping, as well as for maintaining   constant temperature during molding.

The main feature of transformers for electric induction furnaces is great depth of the secondary voltage control (D> 6). Another feature is the need for constant power at several stages of LV which increases standard capability and mass of an EFT.
Transformer type Номинальная мощность, кВА Номинальное напряжение НН, В Количество ступеней Примечание
ЭОМПИ-2000/10 1000-200 1020-182
510-91
10
ЭТМНИ-5000/10 2500-500 2100-420 19
ЭТЦНКИ-12500/10 7100-1406 2435-406 10

Transformers for electroslag refining furnaces

Electroslag remelting furnaces are aggregates of secondary remelting for the production of metals and alloys of high quality. Electroslag remelting (ESR) is the purification of metal from sulfur, nonmetallic inclusions and gases. Metal ingots, obtained by the ESR method, differ from conventional one by dense and homogeneous macrostructure, absence of shrinkage cavities and porosities. The outer surface of the ingots is smooth; it does not require peeling-off or stripping before hot machining.


The main requirement for transformers of this type is providing small stage regulation of secondary voltage at the regulation depth of 2.5-4.
Transformer type Номинальная мощность, кВА Номинальное напряжение НН, В Количество ступеней Примечание
ЭОМНШ-2500/10 1000-333 100-33,3 27
ЭОМПШ-2500/10 1000-704,2 100-33,3 9
ЭОДЦНШ-4000/10 1500-750 100-50 33
ЭОДЦНШ-4000/10 1600 90-40 17
ЭТМНШ-3000/10 2000-1280 87,5-56 19