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China 10-35kV Three Phase Oil Immersed Power Transformer - Trusted 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 Fields
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 Parameters
Rated voltage
35kV and below
Rated capacity
630~3150kVA
Frequency
50Hz/60Hz
Cooling methods
Oil self/air cooling
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 (FAQ)
Q1: What are the main structural characteristics of the winding in these transformers?
The high-voltage winding uses multi-layer cylindrical and continuous structures to improve impact distribution. The low-voltage winding employs cylindrical and spiral structures, which provide high mechanical strength, balanced ampere-turn distribution, and strong short-circuit resistance.
Q2: How does the cooling system of an oil-immersed transformer function?
It relies on insulating oil as the cooling medium. Heat is transferred from the core and windings to the oil, which circulates to dissipate heat. Depending on the installation requirements, cooling options include self-cooling, air-cooling, water-cooling, and forced oil circulation.
Q3: What protective devices are integrated into these transformers?
They are equipped with gas relays to detect internal faults by monitoring gas generation, oil pillows to adjust oil volume based on temperature shifts, and explosion-proof pipes to prevent excessive internal pressure buildup.
Q4: Where are 35kV oil-immersed transformers typically applied?
They are widely applied in power systems of 35kV and below, including small-to-medium substations, industrial production equipment, railway systems, urban grids, and renewable energy generation setups like wind and solar power.
Q5: What are the primary advantages of oil-immersed transformers over dry-type variants?
Oil-immersed transformers generally feature lower manufacturing and purchase costs, highly efficient heat dissipation through natural or forced oil circulation, and excellent insulation performance for high-voltage scenarios.
Q6: What rated capacities are typical for these products?
The common rated capacity range for these transformers spans from 630kVA up to 3150kVA, with typical configurations supporting voltages up to 35kV.