Power Transformer
S11-M Oil-Immersed Distribution Transformer
Model S11-M
An oil-immersed distribution transformer for converting medium-voltage supply to the required load voltage. Select rated capacity, voltage ratio, vector group and tapping arrangement using the model-specific technical table.
Share your rated data, quantity and project requirements.
View this model in our 2026 catalog ↗
Project configuration reviewTechnical documentation support
Product Overview
S11-M fully sealed oil-immersed power transformer is designed for electrical energy distribution. It is commonly used for utility power distribution and industrial distribution projects, with the final selection based on rated data, drawings, and site conditions.
utilities, EPC contractors, transformer distributors, industrial project owners, and electrical engineering companies can request configuration review for oil immersed power transformer. Please send capacity, voltage combination, tap range, connection group, cooling or insulation type, loss data, impedance, and installation environment, quantity, destination, and any project standard requirements for quotation.
Model and Meaning
Technical Specifications
Main Product Performance Parameters of S11 10 kV Double-Winding Series
| Model | Rated capacity (kVA) | Connection group | High voltage (kV) | Tap range (%) | Low voltage (kV) | No-load loss (kW) | Load loss (kW) | No-load current (%) | Short-circuit impedance (%) |
|---|---|---|---|---|---|---|---|---|---|
| S11-M-30 | 30 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.100 | 0.630/0.600 | 1.5 | 4 |
| S11-M-50 | 50 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.130 | 0.910/0.870 | 1.3 | 4 |
| S11-M-63 | 63 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.150 | 1.09/1.04 | 1.2 | 4 |
| S11-M-80 | 80 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.180 | 1.31/1.25 | 1.2 | 4 |
| S11-M-100 | 100 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.200 | 1.58/1.50 | 1.1 | 4 |
| S11-M-125 | 125 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.240 | 1.89/1.80 | 1.1 | 4 |
| S11-M-160 | 160 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.280 | 2.31/2.20 | 1 | 4 |
| S11-M-200 | 200 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.340 | 2.73/2.60 | 1 | 4 |
| S11-M-250 | 250 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.400 | 3.20/3.05 | 0.9 | 4 |
| S11-M-315 | 315 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.480 | 3.83/3.65 | 0.9 | 4 |
| S11-M-400 | 400 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.570 | 4.52/4.30 | 0.8 | 4 |
| S11-M-500 | 500 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.680 | 5.41/5.15 | 0.8 | 4 |
| S11-M-630 | 630 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.810 | 6.20 | 0.6 | 4.5 |
| S11-M-800 | 800 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 0.980 | 7.50 | 0.6 | 4.5 |
| S11-M-1000 | 1000 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 1.15 | 10.3 | 0.6 | 4.5 |
| S11-M-1250 | 1250 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 1.36 | 12.0 | 0.5 | 4.5 |
| S11-M-1600 | 1600 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 1.64 | 14.50 | 0.5 | 4.5 |
| S11-M-2000 | 2000 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 1.94 | 18.3 | 0.4 | 5 |
| S11-M-2500 | 2500 | Dyn11 / Yzn11 / Yyn0 | 6 / 6.3 / 10 / 10.5 | +/-2 x 2.5% / +/-5% | 0.4 | 2.29 | 21.2 | 0.4 | 5 |
For capacities up to 500 kVA, load-loss values before/after the slash apply to Dyn11 or Yzn11 / Yyn0 connection groups respectively. The source also notes that the highest operating efficiency is obtained at an annual average load rate of 35%-40% when the listed loss values are used.
Main Product Performance Parameters of S11 20 kV Double-Winding Series
| Model | Rated capacity (kVA) | Connection group | High voltage (kV) | Tap range (%) | Low voltage (kV) | No-load loss (kW) | Load loss (kW) | No-load current (%) | Short-circuit impedance (%) |
|---|---|---|---|---|---|---|---|---|---|
| S11-M-30 | 30 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.09 | 0.66 | 2.1 | 5.5 |
| S11-M-50 | 50 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.13 | 0.96 | 2 | 5.5 |
| S11-M-63 | 63 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.15 | 1.145 | 1.9 | 5.5 |
| S11-M-80 | 80 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.18 | 1.37 | 1.8 | 5.5 |
| S11-M-100 | 100 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.2 | 1.65 | 1.6 | 5.5 |
| S11-M-125 | 125 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.24 | 1.98 | 1.5 | 5.5 |
| S11-M-160 | 160 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.29 | 2.42 | 1.4 | 5.5 |
| S11-M-200 | 200 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.33 | 2.86 | 1.3 | 5.5 |
| S11-M-250 | 250 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.4 | 3.35 | 1.2 | 5.5 |
| S11-M-315 | 315 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.48 | 4.01 | 1.1 | 5.5 |
| S11-M-400 | 400 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.57 | 4.73 | 1 | 5.5 |
| S11-M-500 | 500 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.68 | 5.66 | 1 | 5.5 |
| S11-M-630 | 630 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.81 | 6.82 | 0.9 | 6 |
| S11-M-800 | 800 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 0.98 | 8.25 | 1.8 | 6 |
| S11-M-1000 | 1000 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 1.15 | 11.33 | 0.7 | 6 |
| S11-M-1250 | 1250 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 1.36 | 13.2 | 0.7 | 6 |
| S11-M-1600 | 1600 | Dyn11 | 20 | +/-5%; +/-2 x 2.5% for selected capacities | 0.4 | 1.64 | 15.95 | 0.6 | 6 |
The 20 kV transformer can be supplied with dual-voltage high-voltage wiring according to project requirements, allowing switching between 20 kV and 10 kV network inputs.
Insulation Level
| Voltage level (kV) | Maximum operating voltage (kV) | 1 min power-frequency withstand voltage (kV) | Lightning impulse full wave (kV) | Lightning impulse cut wave (kV) |
|---|---|---|---|---|
| 0.4 | 0.46 | 5 | 75 | 85 |
| 10 | 12 | 35 | 75 | 85 |
| 20 | 23 | 55 | 125 | 140 |
Installation Dimensions / Drawing
ForS11-M, confirm the capacity-specific outline dimensions, installation base, terminal position, cooling clearance, and lifting / handling requirements. Use the confirmed technical table, project drawing, and site installation plan as the final dimensional reference before ordering or installation.
Applications
S11-M is mainly selected for utility power distribution and industrial distribution projects. The final application should match the confirmed oil immersed power transformer, rated data, and site installation conditions.
- Utility power distribution
- Industrial distribution projects
- Projects requiring sealed oil-immersed transformers
Ordering Instructions / Information Required for Quotation
ForS11-M, send capacity, voltage combination, tap range, connection group, cooling or insulation type, loss data, impedance, and installation environment, quantity, destination, and the expected delivery schedule. The engineering review will be based on the selected oil immersed power transformer and project drawing.
ORDERING INSTRUCTIONS
- State the required S11-M configuration, quantity, project destination, and intended application.
- Provide capacity, voltage combination, tap range, connection group, impedance, loss data, cooling or insulation type, and installation environment for technical review.
- Confirm the capacity-specific outline dimensions, installation base, terminal position, cooling clearance, and lifting / handling requirements before final production or installation planning.
- List any special environmental, wiring, communication, metering, protection, or component requirements in the inquiry.
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