S22(20) Series Distribution Transformer: Leading the Future of Energy-Efficient Power Distribution
With the continuous expansion of global power demand and the increasing focus on energy conversation, distribution networks require transformers that deliver higher efficiency, lower losses, and long-term reliability. As a key component in electricity distribution systems, transformers directly influence grid performance, energy consumption, and operation costs.
The S22(20) series distribution transformer is an advanced oil-immersed distribution transformer designed to meet modern energy efficiency standards and provide reliable voltage conversion for various power applications. With optimized structural design, improved materials, and excellent operating performance, the S22(20) series has become an ideal choice for utilities, industrial facilities, commercial buildings, and renewable energy projects.
What Is an S22(20) Series Distribution Transformer?
The S22(20)-M-30~2500 kVA three-phase hermetically sealed oil-immersed distribution transformer differs from conventional oil-immersed transformers in that it eliminates the conservator and uses corrugated tank radiators for heat dissipation and cooling, while their elastic expansion and contraction compensate for changes in oil volume. Products in these series are suitable for 10 kV, 20 kV, and 35kV transmission and distribution systems, and can be used for power and lighting supply in residential and commercial areas, industrial and mining enterprises, and rural areas.
Features of S22(20) Series Distribution Transformers
- Energy saving: products with the new design code offer better performance and further reduced no-load and load losses.
- Long service life: the tank cover and tank rim of the hermetically sealed transformer are connected by bolts or by welding, isolating the oil from air contact. This prevents insulation from absorbing moisture, greatly slowing down insulation aging and extending service life.
- No core lifting required: for hermetically sealed transformers, users do not need to carry out core-lifting inspection before operation, thereby saving on associated inspection costs.
- Maintenance-free: hermetically sealed transformers require no maintenance.
- Low noise: the compact structural design, together with the use of new materials and new processes, reduces noise.
- Compact design, aesthetic appearance: the tanks of all S22(20)-M series transformers feature corrugated radiator panels. When the oil temperature changes, the change in oil volume is adjusted and compensated by the elastic expansion and contration of the corrugated panels. The corrugated tank has an attractive appearance, compact size, and a small footprint.
Technical Parameters of S22(20) Series Distribution Transformers
Key technical parameters for S22-M hermetically sealed power transformers
| Project capacity(kVA) | Voltage(kV) | Vector group designation | No-load current(%) | No-load loss(W) | Impedance voltage(%) | Load loss | ||
| High voltage(kV) | High-voltage tapping range | Low voltage(kV) | ||||||
| 30 |
6 6.3 10 10.5 |
±2 × 2.5% ±5% |
0.4 | Yyn 11 | 0.4 | 65 | 4 | 455 |
| 50 | 0.4 | 80 | 655 | |||||
| 63 | 0.4 | 90 | 785 | |||||
| 80 | 0.35 | 105 | 945 | |||||
| 100 | 0.35 | 120 | 1140 | |||||
| 125 | 0.35 | 135 | 1360 | |||||
| 160 | 0.30 | 160 | 1665 | |||||
| 200 | 0.30 | 190 | 1970 | |||||
| 250 | 0.30 | 230 | 2300 | |||||
| 315 | 0.30 | 270 | 2760 | |||||
| 400 | 0.25 | 330 | 3250 | |||||
| 500 | 0.25 | 385 | 4.5 | 3900 | ||||
| 630 | 0.25 | 460 | 4460 | |||||
| 800 | 0.20 | 560 | 5400 | |||||
| 1000 | 0.20 | 665 | 7415 | |||||
| 1250 | 0.20 | 780 | 8640 | |||||
| 1600 | 0.20 | 940 | 10440 | |||||
Key technical parameters for S20-M hermetically sealed power transformers
| Project capacity(kVA) | Voltage(kV) | Vector group designation | No-load current(%) | No-load loss(W) | Impedance voltage(%) | Load loss | ||
| High voltage(kV) | High-voltage tapping range | Low voltage(kV) | ||||||
| 30 |
6 6.3 10 10.5 |
±2 × 2.5% ±5% |
0.4 |
Yyn 11 or Yyn 0 |
0.28 | 70 | 4 | 505 |
| 50 | 0.25 | 90 | 730 | |||||
| 63 | 0.23 | 100 | 870 | |||||
| 80 | 0.22 | 115 | 1050 | |||||
| 100 | 0.21 | 135 | 1265 | |||||
| 125 | 0.20 | 150 | 1510 | |||||
| 160 | 0.19 | 180 | 1850 | |||||
| 200 | 0.18 | 215 | 2185 | |||||
| 250 | 0.17 | 260 | 2560 | |||||
| 315 | 0.16 | 305 | 3065 | |||||
| 400 | 0.16 | 370 | 3615 | |||||
| 500 | 0.15 | 430 | 4330 | |||||
| 630 | 0.15 | 510 | 4.5 | 4960 | ||||
| 800 | 0.14 | 630 | 6000 | |||||
| 1000 | 0.13 | 745 | 8240 | |||||
| 1250 | 0.12 | 870 | 9600 | |||||
| 1600 | 0.11 | 1050 | 11600 | |||||
Applications of S22(20) Series Distribution Transformers
Power distribution networks: S22(20) transformers are widely used by electric utilities for urban and rural distribution networks, ensuring stable electricity supply for residential and commercial users.
Industrial applications: factories, manufacturing plants, and industrial parks require continuous and reliable power. The S22(20) series provides efficient voltage conversion for various industrial loads.
Renewable energy projects: as renewable energy systems continue to expand, efficient distribution transformers are essential for grid connection and energy management. The S22(20) series supports solar, wind, and other clean energy applications with reliable performance.