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China 10-35kV Three Phase Oil Immersed Power Transformer - Reliable Suppliers & Factory Direct Quality
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.
Data 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
What are the primary structural advantages of the windings in these transformers?
The high-voltage winding uses multi-layer cylindrical and continuous structures to optimize impact distribution. The low-voltage winding utilizes cylindrical and spiral structures, which provide high mechanical strength, balanced ampere turns, and excellent short-circuit resistance.
What cooling methods are available for oil-immersed transformers?
They rely on insulating oil to circulate and carry away heat. Depending on the application requirements, cooling methods include oil immersed self-cooling (ONAN), oil immersed air-cooling (ONAF), oil immersed water-cooling, and forced oil circulation.
What protective safety devices are installed on the transformer?
These transformers are equipped with gas relays (to detect internal faults and gas generation), oil pillows (to adjust oil volume changes), and explosion-proof pipes (to release excessive internal pressure).
Why are oil-immersed transformers preferred over dry-type options in some scenarios?
Oil-immersed transformers typically offer a lower initial cost, superior heat dissipation performance due to the insulating oil, higher insulation safety, and a wide applicability across all voltage levels.
What are the typical technical parameters and capacity ranges?
They operate at rated voltages of 35kV and below, with a common rated capacity range of 630 to 3150kVA, running at frequencies of 50Hz or 60Hz using oil insulation.