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High-Quality 10-35kV Three Phase Oil Immersed Power Transformers from China Suppliers and Factory
Structural characteristics
Winding structure
The high-voltage winding adopts multi-layer cylindrical and continuous structures to improve the impact distribution of the winding; The low-voltage winding adopts cylindrical and spiral structures, with high mechanical strength, balanced distribution of ampere turns, and strong short-circuit resistance.
Core
Adopting high-quality cold-rolled grain oriented silicon steel sheets with fully oblique seam stacking method, the electrical and mechanical strength of the transformer is improved.
Cooling system
relying on insulating oil as the cooling medium, heat is carried away through the circulation of oil to achieve cooling. According to different cooling methods, it can be divided into oil immersed self cooling, oil immersed air cooling, oil immersed water cooling, forced oil circulation, etc.
Protective devices
equipped with gas relays, oil pillows, explosion-proof pipes and other protective devices. Gas relay is used to detect the gas generated when there is a fault inside the transformer oil tank, oil pillow is used to adjust the oil volume, and explosion-proof pipe is used to prevent excessive pressure inside the transformer.
Application
Power system
widely used in power systems of 35kV and below, it is the main substation equipment for small and medium-sized substations, used to reduce high voltage to low voltage suitable for user.
Industrial field
Used for power equipment in industrial production, providing high-power current for industrial machinery and equipment.
Railway system
widely used in railway systems to convert high voltage current into low voltage current suitable for train use.
New energy generation
In the field of new energy such as wind power and photovoltaic power generation, 35kV oil immersed transformers are commonly used to connect power generation equipment and the power grid.
Urban power grid
used for substations, distribution rooms, etc. in cities to meet the electricity needs of urban residents and commercial users.
Product Features
Lower cost
Compared to dry-type transformers, oil immersed transformers have lower costs.
Good heat dissipation performance
The cooling effect of insulating oil is significant, which can effectively reduce the operating temperature of transformers.
High insulation performance
Insulating oil provides good insulation effect, improving the safety and reliability of transformers.
Wide applicability
Suitable for full voltage level scenarios.
Technical Parameter
Rated voltage
35kV and below.
Rated capacity
The common capacity range is 630~3150kVA.
Frequency
50Hz/60Hz.
Cooling methods
Oil immersed self cooling, oil immersed air cooling, etc.
Insulation method
Oil insulation.
Date Sheet of Typical Products
The energy efficiency level of 35 kV oil immersed three phase double-winding no-load tap-changing power transformer
Rated capacity |
Level Ⅰ |
Level Ⅱ |
Level Ⅲ |
short circuit impedance |
|||
No-Load Loss |
Load Loss (75℃) |
No-Load Loss |
Load Loss (75℃) |
No-Load Loss |
Load Loss (75℃) |
||
3150 |
1.7 |
20.7 |
2.0 |
20.7 |
2.4 |
21.9 |
7 |
4000 |
2.0 |
24.6 |
2.3 |
24.6 |
2.9 |
25.9 |
|
5000 |
2.4 |
28.2 |
2.8 |
28.2 |
3.5 |
29.7 |
|
6300 |
2.9 |
31.5 |
3.4 |
31.5 |
4.2 |
33.3 |
8 |
8000 |
4.0 |
34.6 |
4.7 |
34.6 |
5.8 |
36.5 |
|
10000 |
4.8 |
40.8 |
5.7 |
40.8 |
7.0 |
43.0 |
|
12500 |
5.5 |
48.4 |
6.5 |
48.4 |
8.0 |
51.1 |
|
16000 |
6.7 |
59.2 |
7.9 |
59.2 |
9.7 |
62.5 |
|
20000 |
7.9 |
71.6 |
9.4 |
71.6 |
11.5 |
75.5 |
|
25000 |
9.4 |
84.6 |
11.1 |
84.6 |
13.6 |
89.3 |
10 |
31500 |
11.1 |
100.8 |
13.1 |
100.8 |
16.2 |
106.4 |
|
The energy efficiency level of 35 kV oil-immersed three-phase double-winding OLTC power transformer
Rated capacity |
Level Ⅰ |
Level Ⅱ |
Level Ⅲ |
short circuit impedance |
|||
No-Load Loss |
Load Loss (75℃) |
No-Load Loss |
Load Loss (75℃) |
No-Load Loss |
Load Loss (75℃) |
||
3150 |
1.8 |
22.2 |
2.1 |
22.2 |
2.6 |
23.5 |
7 |
4000 |
2.1 |
26.2 |
2.5 |
26.2 |
3.1 |
27.6 |
|
5000 |
2.6 |
30.8 |
3.0 |
30.8 |
3.7 |
32.5 |
|
6300 |
3.1 |
33.0 |
3.7 |
33.0 |
4.5 |
34.9 |
7.5 |
8000 |
4.3 |
36.5 |
5.1 |
36.5 |
6.3 |
38.6 |
|
10000 |
5.1 |
43.2 |
6.0 |
43.2 |
7.4 |
45.6 |
|
12500 |
6.0 |
51.1 |
7.1 |
51.1 |
8.7 |
54.0 |
8 |
16000 |
7.2 |
63.3 |
8.5 |
63.3 |
10.5 |
66.8 |
|
20000 |
8.5 |
74.4 |
10.1 |
74.4 |
12.4 |
78.6 |
|
25000 |
10.1 |
88.0 |
11.9 |
88.0 |
14.6 |
92.9 |
10 |
31500 |
12.0 |
104.4 |
14.2 |
104.4 |
17.4 |
110.2 |
|
The energy efficiency level of 10 kV oil immersed three phase double-winding no-load tap-changing power transformer
Rated capacity |
Level Ⅰ |
Level Ⅱ |
Level Ⅲ |
Short circuit impedance |
|||||||||||||||
Electrical steel strip |
Amorphous alloy |
Electrical steel strip |
Amorphous alloy |
Electrical steel strip |
Amorphous alloy |
||||||||||||||
No -Load Loss W |
Load Loss |
No -Load Loss W |
Load Loss |
No -Load Loss W |
Load Loss |
No -Load Loss W |
Load Loss |
No -Load Loss W |
Load Loss |
No- Load Loss W |
Load Loss |
||||||||
Dyn11/Yzn11 |
Yyn0 |
Dyn11/Yzn11 |
Yyn0 |
Dyn11/Yzn11 |
Yyn0 |
Dyn11/Yzn11 |
Yyn0 |
Dyn11/Yzn11 |
Yyn0 |
Dyn11/Yzn11 |
Yyn0 |
||||||||
30 |
65 |
455 |
430 |
25 |
510 |
480 |
70 |
505 |
480 |
33 |
535 |
510 |
80 |
630 |
600 |
33 |
630 |
600 |
4.0 |
50 |
80 |
655 |
625 |
35 |
735 |
700 |
90 |
730 |
695 |
43 |
780 |
745 |
100 |
910 |
870 |
43 |
910 |
870 |
|
63 |
90 |
785 |
745 |
40 |
880 |
840 |
100 |
870 |
830 |
50 |
930 |
890 |
110 |
1090 |
1040 |
50 |
1090 |
1040 |
|
80 |
105 |
945 |
900 |
50 |
1060 |
1010 |
115 |
1050 |
1000 |
60 |
1120 |
1070 |
130 |
1310 |
1250 |
60 |
1310 |
1250 |
|
100 |
120 |
1140 |
1080 |
60 |
1270 |
1215 |
135 |
1265 |
1200 |
75 |
1350 |
1285 |
150 |
1580 |
1500 |
75 |
1580 |
1500 |
|
125 |
135 |
1360 |
1295 |
70 |
1530 |
1450 |
150 |
1510 |
1440 |
85 |
1615 |
1540 |
170 |
1890 |
1800 |
85 |
1890 |
1800 |
|
160 |
160 |
1665 |
1585 |
80 |
1870 |
1780 |
180 |
1850 |
1760 |
100 |
1975 |
1880 |
200 |
2310 |
2200 |
100 |
2310 |
2200 |
|
200 |
190 |
1970 |
1870 |
95 |
2210 |
2100 |
215 |
2185 |
2080 |
120 |
2330 |
2225 |
240 |
2730 |
2600 |
120 |
2730 |
2600 |
|
250 |
230 |
2300 |
2195 |
110 |
2590 |
2470 |
260 |
2560 |
2440 |
140 |
2735 |
2610 |
290 |
3200 |
3050 |
140 |
3200 |
3050 |
|
315 |
270 |
2760 |
2630 |
135 |
3100 |
2950 |
305 |
3065 |
2920 |
170 |
3275 |
3120 |
340 |
3830 |
3650 |
170 |
3830 |
3650 |
|
400 |
330 |
3250 |
3095 |
160 |
3660 |
3480 |
370 |
3615 |
3440 |
200 |
3865 |
3675 |
410 |
4520 |
4300 |
200 |
4520 |
4300 |
|
500 |
385 |
3900 |
3710 |
190 |
4380 |
4170 |
430 |
4330 |
4120 |
240 |
4625 |
4400 |
480 |
5410 |
5150 |
240 |
5410 |
5150 |
|
630 |
460 |
4460 |
250 |
5020 |
510 |
4960 |
320 |
5300 |
570 |
6200 |
320 |
6200 |
4.5 |
||||||
800 |
560 |
5400 |
300 |
6075 |
630 |
6000 |
380 |
6415 |
700 |
7500 |
380 |
7500 |
|||||||
1000 |
665 |
7415 |
360 |
8340 |
745 |
8240 |
450 |
8800 |
830 |
10300 |
450 |
10300 |
|||||||
1250 |
780 |
8640 |
425 |
9720 |
870 |
9600 |
530 |
10260 |
970 |
12000 |
530 |
12000 |
|||||||
1600 |
940 |
10440 |
500 |
11745 |
1050 |
11600 |
630 |
12400 |
1170 |
14500 |
630 |
14500 |
|||||||
2000 |
1085 |
13180 |
550 |
14000 |
1225 |
14640 |
710 |
14800 |
1360 |
18300 |
720 |
18300 |
5.0 |
||||||
2500 |
1280 |
13360 |
670 |
15450 |
1440 |
14840 |
860 |
16300 |
1600 |
21200 |
865 |
21200 |
|||||||
Frequently Asked Questions (FAQ)
What are the primary applications of a 35kV oil-immersed transformer?
They are widely used in power systems of 35kV and below, including small and medium substations, industrial facilities, railway networks, urban distribution grids, and connections for wind and photovoltaic new energy power generation.
How does the winding structure improve transformer reliability?
The high-voltage winding features a multi-layer cylindrical and continuous structure to optimize voltage distribution under impact. The low-voltage winding utilizes cylindrical and spiral designs, ensuring high mechanical strength, balanced ampere turns, and excellent short-circuit resistance.
What cooling methods are available for these oil-immersed transformers?
Depending on the specific system requirements, cooling options include oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, and forced oil circulation.
What are the main advantages of oil-immersed transformers over dry-type variants?
Oil-immersed transformers generally offer lower manufacturing costs, superior heat dissipation due to the oil circulation, excellent insulation performance, and a wider range of applicability across all voltage levels.
What safety and protective devices are integrated into the design?
They are equipped with gas relays to detect internal faults, oil pillows to adjust and maintain proper oil volume, and explosion-proof pipes to prevent dangerous pressure buildup within the tank.
What is the typical rated capacity and frequency range for these products?
The common rated capacity range is 630 to 3150 kVA (with typical models reaching higher capacities as shown in data sheets) operating at standard frequencies of either 50Hz or 60Hz.