Electrical oven transformer
Product description
The electric furnace transformer produced by our company absorbs
the advanced technology and process of the same industry all over
the world. The iron core adopts high magnetic conductivity silicon
steel sheet and five-stage step stacking mode to reduce no-load
loss and noise. High quality oxygen free copper conductor is used
for electromagnetic wire. With special structure, the transformer
has many advantages, such as strong overload capacity, high
anti-short circuit ability and so on, which makes the technical
performance of the product at the domestic advanced level.
Structure features
1. Iron core
The core of the shell furnace transformer is a frame structure with
full oblique joint. The iron core has narrow width, good heat
dissipation conditions and simple structure.
2. Winding
The winding of the shell furnace transformer is a rectangle with
the same shape as the section of the core column. The low-voltage
winding is made of a whole copper plate, with good heat dissipation
conditions, and the outlet is of welded structure; the high-voltage
winding is of pie structure. The winding arrangement shall be
staggered. The high voltage line and low voltage line in each group
should have equal magnetic potential, and their radial dimensions
should be basically equal. Theoretically, the low-voltage line
segment is placed at both ends because of its small insulation
distance to the core. However, in order to make the short-circuit
impedance of the transformer smaller, it needs more than one
magnetic flux leakage group to meet the requirements, and the
number of magnetic flux leakage groups will be limited when the
low-voltage line segments are placed at both ends, so sometimes the
high-voltage line segments are placed at both ends. In the process
of voltage regulation, in order to make the line configuration
symmetrical and ensure the magnetic potential balance,
multi-channel parallel connection is usually used in the voltage
regulation line, so as to ensure that the impedance of each
magnetic leakage group is equal and the current of each low-voltage
line section is equal.
3 Cooling mode
The shell type electric furnace transformer generally adopts forced
oil-oriented circulation, forced water cooling or forced
oil-oriented circulation, forced air cooling. As the shell type
transformer can easily place a partition between the oil tank and
the body, the cooled transformer oil is forced to flow through the
line cake, the oil flow is uniform, the temperature difference of
each part is small, the heat dissipation effect is good, the
hottest point temperature can be reduced by about 5°C, and the
additional overload capacity of the transformer can be increased.
4. Oil tank
Because the winding of the shell transformer is completely shielded
by the iron core, the possibility of damage due to the external
force is small, so the oil tank of suitable shape can be adopted
according to the shape of the body, so that the size and weight of
the transformer are greatly reduced.
Technical data
Specification and parameter table of electric furnace transformer of non excitation voltage regulation
Rated capacity kVA | Primary voltage kV | Secondary voltage kV | Rated secondary current A | Voltage regulating mode | Vector Group | Short-circuit voltage % | Series reactor |
| Large impedance | Small impedance | Charged reactor | rated capacity kVAR | reactance drop % |
| 630 | 6 6.3 10 10.5 11
| 200 170 116 98 | 1819 | non excitation voltage regulation | D(Y) d0(11) | 24-26 | 10- 11 | (8-9) | 120 | 19 |
| 800 | 2309 | 150 |
| 1000 | 2887 | 190 |
| 1250 | 210 180 121 104 | 3437 | 22-24 | 9- 10 | 200 | 16 |
| 1600 | 4399 | 260 |
| 2000 | 5499 | 320 |
| 2500 | 220 190 127 110 | 6561 | 21-23 | 8-9 | 280 | 11.2 |
| 3150 | 8267 | 19-21 | 7- 8 | 350 |
| 4000 | 240 210 139 121 | 9623 | | | 340 | 8.5 |
| 5000 | 12028 | 430 |
| 6300 | 260 240 210 139 | 13990 | 360 | 5.7 |
| 8000 | 17765 | (7-8) | 460 |
Specification and parameter table of on-load voltage regulating electric furnace transformer
Rated capacity (kVA) | Primary voltage kV | Secondary voltage V | Level voltage | Rated secondary current A | Voltage regulation mode | Regulating series | Vector Group | Short-circuit impedance (%) |
| constant power | continuous current |
| 10000 | 35 38.5 | 280-240 | 240-100 | 10 | 24056 | Split phase on load voltage regulation (maximum allowable level
difference of each phase is 3 levels) | Class 19 (first 5 constant power output, last 15 constant current
output) | Dd0; Yd11 YN d11 | 7～8 |
| 12500 | 314-270 | 270- 116 | 11 | 26729 |
| 16000 | 353- 305 | 305- 137 | 12 | 30287 |
| 20000 | 35 38.5 110 121 | 392-340 | 340-158 | 13 | 33962 | 35kV Dd0; Yd11; YN dl1 110 kV YN d11 | 35kV 6-7 110 kV 7.5~ 8.5 |
| 25000 | 436- 380 | 380-184 | 14 | 37984 |
| 31500 | 489-425 | 425-201 | 16 | 42792 |
| 40000 | 547-475 | 475-223 | 18 | 48619 |
| 50000 | 610- 530 | 530-250 | 20 | 54467 |
| 63000 | 673-585 | 585-277 | 25 | 62176 |
| 80000 | 760-660 | 660- 310 | 28 | 69982 |
·Service conditions
1. Altitude: ＜ 1000m.
2. Ambient temperature: - 25 ℃ - + 40 ℃.
3. Relative humidity of air: 90% (+ 25 ℃).
4. Device type: outdoor type.
5. Installation site: no corrosive gas, no obvious dirt and other
areas.
6. It is used for steelmaking, smelting of non-ferrous metals,
withdrawal of various ferroalloys, silicon compounds, withdrawal of
pure silicon, etc.
Workshop
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