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10~35kV Three Phase Oil Immersed Power Transformer - China Suppliers & Factory for Reliable Energy Solutions
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
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 kVA |
Level Ⅰ | Level Ⅱ | Level Ⅲ | short circuit impedance % |
|||
| No-Load Loss kW |
Load Loss (75℃) kW |
No-Load Loss kW |
Load Loss (75℃) kW |
No-Load Loss kW |
Load Loss (75℃) kW |
||
| 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 kVA |
Level Ⅰ | Level Ⅱ | Level Ⅲ | short circuit impedance % |
|||
| No-Load Loss kW |
Load Loss (75℃) kW |
No-Load Loss kW |
Load Loss (75℃) kW |
No-Load Loss kW |
Load Loss (75℃) kW |
||
| 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 kVA |
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 W | No -Load Loss W | Load Loss W | No -Load Loss W | Load Loss W | No -Load Loss W | Load Loss W | No -Load Loss W | Load Loss W | No- Load Loss W | Load Loss W | ||||||||
| 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 main structural features of oil-immersed transformers?
They feature multi-layer cylindrical and continuous high-voltage windings, high mechanical strength low-voltage windings, a high-quality cold-rolled grain-oriented silicon steel core, efficient oil-based cooling systems, and critical protection devices like gas relays and oil pillows.
Where are 35kV and 10kV oil-immersed transformers typically applied?
These transformers are commonly used in power systems, industrial machinery setups, railway systems, new energy generation (wind and solar grids), and urban distribution grids to step down high voltages for end-user safety.
What are the primary benefits of choosing oil-immersed over dry-type transformers?
Oil-immersed transformers offer a lower overall manufacturing cost, superior heat dissipation performance due to the insulating oil, excellent electrical insulation, and high reliability across a wide range of voltage levels.
What cooling methods are standard for these transformers?
Standard cooling methods include oil-immersed self-cooling (ONAN) and oil-immersed air cooling (ONAF), which efficiently maintain optimal operating temperatures using circulating insulating oil.
What is the typical rated capacity range of the 35kV products?
The common capacity range for standard 35kV oil-immersed transformers spans from 630kVA up to 3150kVA, with larger models reaching up to 31500kVA as shown in the efficiency data sheets.