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China S11/S13 Oil-Immersed Transformer Suppliers - Low Loss Copper Winding Factory Products for Power Transmission
Core Product Advantages
1. Outstanding Economic Benefits & Energy Conservation
Compared with the traditional S9 series, the S11 series delivers an average reduction of 30% in no-load loss, a significant decrease of 70% to 85% in no-load current, and an additional 15% reduction in total loss compared to national standards. Engineered with high-permeability cold-rolled silicon steel cores and oxygen-free copper windings, it maximizes power conversion efficiency, saving over 1,000 kWh of electricity per unit annually.
2. Fully Sealed Design & Extended Service Life
The transformer oil tank utilizes a fully sealed structure connected flexibly by bolts or welding, isolating the transformer oil from ambient air. This completely prevents oil oxidation, moisture absorption, and dielectric deterioration, extending the operational service life to over 25 years while minimizing maintenance cycles and total lifecycle cost.
3. Process Upgrades & Advanced Safety Systems
Key oil tank sealing components and manufacturing methods are optimized to eliminate leakage risks. The system includes multi-stage protection devices such as pressure relief valves and gas relays for robust fire and explosion resistance. Certified by ISO9001 and 3C, it guarantees reliable operation across extreme ambient temperatures ranging from -40°C to 60°C.
4. Compact Structure & Space Optimization
The S11-M series features corrugated plate radiators that flex to compensate for oil volume changes, eliminating the need for an external oil conservator and significantly decreasing equipment footprint. Available in capacities from 10 kVA to 2500 kVA (10 kV/0.4 kV), it supports custom configurations for industrial plants, urban distribution, and renewable energy sectors.
Product Specifications
| Rated Capacity (kVA) |
Voltage Combination | Connection Group Symbol |
No-load Loss (W) |
On-Load Loss (kW) 75℃ |
No-load Current (%) |
Short-circuit Impedance (%) |
||
|---|---|---|---|---|---|---|---|---|
| High Voltage (kV) | High Voltage Tapping (kV) | Low Voltage (kV) | ||||||
| 30 | 6 6.3 10 10.5 11 |
± 5% ± 2×2.5% |
0.4 | Dyn11 Yyn0 |
100 | 630 / 600 | 0.80 | 4.0 |
| 50 | 130 | 910 / 870 | 0.75 | |||||
| 63 | 150 | 1090 / 1040 | 0.75 | |||||
| 80 | 180 | 1310 / 1250 | 0.70 | |||||
| 100 | 200 | 1580 / 1500 | 0.65 | |||||
| 125 | 240 | 1890 / 1800 | 0.65 | |||||
| 160 | 280 | 2310 / 2200 | 0.60 | |||||
| 200 | 340 | 2730 / 2600 | 0.50 | |||||
| 250 | 400 | 3200 / 3050 | 0.50 | |||||
| 315 | 480 | 3830 / 3650 | 0.45 | |||||
| 400 | 570 | 4520 / 4300 | 0.45 | |||||
| 500 | 680 | 5410 / 5150 | 0.40 | |||||
| 630 | 810 | 6200 | 0.40 | 4.5 | ||||
| 800 | 980 | 7500 | 0.35 | |||||
| 1000 | 1150 | 10300 | 0.35 | |||||
| 1250 | 1360 | 12000 | 0.30 | |||||
Detail Pictures
Frequently Asked Questions (FAQ)
How does the S11 transformer achieve lower energy consumption compared to older S9 models?
The S11 series utilizes high-permeability cold-rolled silicon steel cores and high-purity oxygen-free copper windings, resulting in a 30% average decrease in no-load loss and a 70% to 85% reduction in no-load current compared to S9 units.
What is the advantage of the fully sealed tank structure?
The hermetically sealed structure completely isolates internal insulating oil from atmospheric air and moisture. This prevents oxidation, slows down oil aging, eliminates regular oil replacement, and extends service life up to 25+ years.
How does the corrugated radiator replace a conventional oil conservator?
The corrugated plate radiators naturally expand and contract with thermal variations in oil volume. This built-in elasticity compensates for oil volume changes, removing the need for a bulky conservator tank and reducing total equipment footprint.
What are the supported operational temperature ranges and safety certifications?
The unit is engineered for stable continuous duty in ambient conditions from -40°C up to +60°C. It meets ISO9001 quality standards and holds national compulsory 3C certification, equipped with integrated pressure relief valves and gas relays.
What capacity ranges and voltage combinations are available?
Standard capacities range from 30 kVA up to 1250 kVA (customizable up to 2500 kVA), supporting high voltage primary levels of 6 kV, 6.3 kV, 10 kV, 10.5 kV, and 11 kV down to a 0.4 kV secondary output.