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11kV Oil-Immersed Transformer
Reliable 11kV oil-immersed transformer for medium-voltage distribution, outdoor use, and customized project requirements.
11kV Oil-Immersed Transformer
The S11/S13/S20/S22 Series Fully Sealed Oil-Immersed Transformers are designed for AC systems operating at 50Hz/60Hz. These electrical transformers are ideal for power distribution in sectors such as petroleum, metallurgy, chemical, textile, and light industries. Their robust design makes them suitable for dusty environments and demanding power substations.
Key Features:
The 11kV oil-immersed transformer uses transformer oil as the insulation and cooling medium. It has a mature structure, high reliability, strong overload capacity, low loss, and a long service life. With its economical cost, it is suitable for long-term operation in both indoor and outdoor environments, as well as various distribution locations. It is commonly used in terminal distribution systems for residential areas, factories, shopping malls, and infrastructure, making it the most commonly used distribution transformer in the 11kV distribution network.
Why choose a 11KV oil-immersed transformer
The S11/S13/S20/S22 Series power transformers are engineered for superior performance and durability in diverse applications, including industrial facilities and power substations. With advanced core and winding designs, these transformers deliver low energy loss, excellent cooling, and long service life.The corrugated tank design compensates for oil volume changes caused by temperature fluctuations, improving operational stability.The transformers are sealed to prevent oxygen and moisture ingress, ensuring optimal insulation and oil longevity.Safety features, including pressure release and gas relay options, enhance reliability for critical installations.
Product Advantages
High-Efficiency Core: The transformer core is made of high-permeability, grain-oriented cold-rolled silicon steel sheets. Featuring a new structure with fully mitered joints and stepped circular cross-sections, the core minimizes energy loss and noise.
Reliable Windings: The windings are designed with corrugated oil ducts and non-impregnated processes, secured with compression bands. High-voltage windings come with taps to adjust the voltage as required, with tap changers conveniently located on the tank lid for easy operation after power disconnection.
Safety Protection Devices: Models ranging from 30 to 2000kVA are equipped with pressure relief valves and optional gas relays with alarm and tripping terminals to enhance operational safety.
Advanced Oil Cooling System: The transformer features a corrugated wall tank with integrated cooling and “breathing” functions, eliminating the need for an oil conservator. The vacuum oil-filling process ensures no moisture or air contamination, enhancing the longevity of the AC transformer and reducing maintenance requirements.
Operating Conditions
Rated Voltage: ≤11kV.
Altitude: ≤1000m.
Ambient Temperature: -25°C to +40°C.
Installation: Indoor or outdoor installations in industrial settings.
Application
The 11kV oil-immersed transformer is mainly used in terminal power distribution scenarios such as urban residential areas, industrial parks, industrial and mining enterprises, commercial buildings, rural power grids, and construction sites. As the core equipment for converting 11kV high voltage to 0.4kV low voltage, it meets the power demands for production, daily life, lighting, and power supply, and is suitable for long-term stable operation outdoors. It is the most widely used and largest quantity transformer type in the power distribution system.
Model meaning
Technical Parameters
Overall and mounting dimensions(mm)（Reference）
Model meaning
| S11-M-XXX/11 | S: | Three-phase transformer |
| 11: | Performance loss level (higher number, lower no-load loss) | |
| M: | Fully sealed structure, maintenance-free, prevents oil aging | |
| XXX: | Rated capacity (kVA) | |
| 11: | Rated voltage 11kV (high-voltage side) |
Technical Parameters
| Item | Specification |
|---|---|
| Rated Voltage | HV: 11kV; LV: 0.4 kV |
| Rated Capacity | 100–3150 kVA (standard: 200 / 400 / 500 / 800 / 1000 / 1250 / 1600 / 2000 kVA) |
| Rated Frequency | 50 Hz / 60 Hz (optional) |
| Number of Phases | Three-phase |
| Vector Group | Dyn11 (most commonly used for export) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Tap Changer | Off-circuit tap changer: ±2 × 2.5% |
| Impedance Voltage | 4%–6% (depending on capacity) |
| Insulation Level | HV: LI 60 kV / AC 28 kV; LV: LI 25 kV / AC 5 kV |
| Winding Material | All copper winding |
| Structure Type | Hermetically sealed (M), corrugated tank |
| Insulating Medium | 25# transformer oil |
| Operating Environment | Indoor / Outdoor, -25°C to +40°C |
| Loss Level | S11, S13 (low-loss type) |
Overall and mounting dimensions(mm)（Reference）
Custom 11 kV Oil‑Immersed Transformer Solutions
(The values can be customized according to project requirements.)
If you have specific requirements for the 11 kV oil‑immersed transformer, please contact us. Our team will review your system design and provide a tailored solution.
We can customize rated capacity, voltage ratio, cooling method, tap changer type, insulation level, and tank protection features to ensure reliable performance and long‑term stability in your power distribution system. The 11 kV oil‑immersed transformer offers robust design, excellent heat dissipation, and high load capacity, making it suitable for industrial facilities, commercial projects, utility substations, and renewable energy applications.
FAQ
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