- Transformer manufacturers in China
The S11-M and S20-M series are three-phase, fully sealed oil-immersed transformers. The M designation identifies the fully sealed design. Select the series and rated capacity using the technical data for the required voltage ratio and installation.
The S11-M brochure describes copper windings and a corrugated tank that accommodates changes in oil volume without a separate conservator. The S20-M schedule provides model-specific no-load loss, load loss and short-circuit impedance values. A series name alone does not establish a particular export-market efficiency approval.
| Item | S11-M Series | S20-M Series |
|---|---|---|
| Product page | S11-M Oil-Immersed Distribution Transformer | S20-M Oil-Immersed Power Transformer |
| Construction | Three-phase, fully sealed, oil-immersed | Three-phase, fully sealed, oil-immersed |
| Catalogue information | Corrugated tank, copper windings and operating conditions | 10 kV-class schedule covering 30–2,500 kVA |
| No-load loss | Request the selected model’s technical schedule | S20-M-1000/10: 0.745 kW |
| Load loss | Request the selected model’s technical schedule | S20-M-1000/10: 8.24 kW |
| Short-circuit impedance | Confirm for the selected rating | 4.0%, 4.5% or 5.0%, according to the listed capacity |
The S20 values above refer to the 1,000 kVA catalogue entry. Compare series only at matching capacity, voltage ratio, connection and test reference conditions. Request the approved technical schedule and applicable project documentation before ordering.
The S11-M brochure specifies a maximum ambient temperature of +40°C, a minimum of −25°C, a maximum daily average of +30°C and a maximum annual average of +20°C. Confirm the permitted conditions for the selected S20-M model separately.
Specify the project location, required technical standard, installation environment and documentation requirements. Confirm product compliance for the actual model and destination; do not infer it from the series designation.
S11-M is described for urban power-distribution networks. Confirm the required capacity and voltage ratio.
S11-M is also described for rural distribution networks. Confirm the load profile, site conditions and protection arrangement.
Discuss the installation and technical requirements for the selected S11-M or S20-M unit before confirming the scope of supply.
In the S11-M design, the flexibility of the corrugated tank accommodates changes in oil volume. Removing the separate conservator limits contact between the oil and ambient air. Confirm the tank design, oil specification and accessories for the selected unit. A fully sealed design does not remove the need to follow the operating and maintenance instructions.
Request the model-specific loss data, short-circuit impedance, dimensions, weight, nameplate details and scope of supply. Agree the inspection and test documentation before manufacture. Test and maintenance procedures must follow the approved technical documents and the requirements for the installation.
Both are three-phase, fully sealed oil-immersed series. The available S11-M brochure describes construction and operating conditions; the S20-M schedule lists individual loss and impedance values. A percentage comparison requires corresponding S11-M and S20-M data under the same conditions.
The catalogue schedule covers 30–2,500 kVA models in the 10 kV class. Confirm the full voltage ratio, connection and scope of supply for the selected model.
No. Confirm the applicable requirements and request documentation for the specific model, configuration and project.
Confirm these items in the model-specific technical schedule and agreed scope of supply.
Follow the operation and maintenance manual supplied for the fully sealed design. Any inspection, opening or servicing of the oil system must follow the manufacturer’s procedures.
Send your required capacity, primary and secondary voltages, frequency, connection, installation conditions, quantity and project location. Include the technical and documentation requirements for the project.
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