66kV Oil-Immersed Distribution Transformer
This 66kV oil-immersed transformer is designed for medium-voltage grid applications, delivering reliable power to industrial parks, mines, and transport hubs. It offers high short-circuit tolerance, low energy loss (below national standards), quiet operation, and long-term durability for efficient and safe power distribution.
Overview of the 66kV Oil-Immersed Distribution Transformer
Designed specifically for use as an important connection in electric power transmission and distribution between electrical injection point locations such as industrial parks, mining locations or between urban infrastructure, the 66 kV Oil-Immersed Distribution Transformer is built to handle the unique requirements of medium voltage applications and features a core constructed of high-quality, silicon steel sheets arranged in a multi-stage, ladder-like formation which provides for a negligible amount of no-load loss or operational noise. A corrugated tank that is fully sealed provides improved cooling and increased mechanical strength; the improved yoke structure coupled with the full core-to-tank positioning provides for improved transport stability.
The 66 kV Oil-Immersed Distribution Transformer has been engineered to provide high short circuit tolerance and is constructed using concentric windings with internal/external support and vacuum pressure-impregnated windings; these design techniques result in the delivery of stable, energy-efficient operations that meet or exceed the requirements of GB 6451-2008 and other National Standards and have 10 – 15% less no-load and load loss than the regulatory limits, providing you with a low operating cost option in a demanding environment.
- Rated capacities from 6300kVA to 63000kVA, High Voltage 66kV (35 -38.5kV Tap Range ±2×2.5%).
- Low Voltage Options: 3.15kV, 3.3kV, 6.3kV, 6.6kV, 10.5kV, YNd11 Connection.
- Designed for Altitudes Up To 1000m and Ambient Temperatures of -25°C to +40°C.
- Sealed Corrugated Tank with Enhanced Corrosion Resistant Protection; Contributes to Long Service Life.
66kV Oil-Immersed Distribution Transformers Benefits and Advantages
High Short Circuit Tolerance
Design that has been certified to withhold severe electrodynamic conditions and provides stability to the electrical distribution network and safety to the equipment connected to it.
Energy Efficient
10 – 15% no-load loss and 3 – 5% load loss below GB 6451-2008 limits; this results in a significant reduction in operational costs.
Quiet Operation
Multi-step core and precision joint design keep noise levels low for installation near residential or commercial zones.
Reliable 24/7 Performance
Rigorous quality control and vacuum pressure impregnation ensure consistent performance under continuous duty.
Superior Heat Dissipation
Corrugated tank fins maximize cooling surface, maintaining optimal operating temperature.
Standards Compliant
Manufactured to GB 6451-2008, IEC 60076, suitable for diverse grid codes and international projects.
Uses & Industries
Industrial Parks
Centralized medium-voltage distribution for energy-intensive manufacturing and processing facilities.
Mining Areas
Reliable power for metal and non-metallic mining operations with high load fluctuations and harsh conditions.
Transport Infrastructure
Power supply for highways, ports, railways, and airport facilities requiring continuous, stable electricity.
Urban & Rural Grids
Medium-voltage backbone for municipal distribution networks and rural electrification projects.
Technical Data & Specifications
66kV S(F)11 series oil-immersed distribution transformers. Custom voltage ratios and impedance values available upon request. Reference dimensions and weights are subject to final engineering drawings.
| Type | Rated Capacity (kVA) | High Voltage (kV) | Tap Range | Low Voltage (kV) | Connection | Impedance (%) | Gross Weight (t) | Dimensions L×W×H (mm) | No-Load Loss (kW) | Load Loss (kW) |
|---|---|---|---|---|---|---|---|---|---|---|
| S(F)11-6300/66 | 6300 | 66 | ±2×2.5% | 3.15; 3.3; 6.3; 6.6; 10.5 | YNd11 | 9~11 | 22 | 5600×3800×4000 | 8 | 34.2 |
| S(F)11-8000/66 | 8000 | 9~11 | 24 | 5700×4000×4200 | 9.6 | 40.5 | ||||
| S(F)11-10000/66 | 10000 | 9~11 | 27 | 5800×4200×4400 | 11.3 | 47.8 | ||||
| S(F)11-12500/66 | 12500 | 9~11 | 30 | 5900×4300×4500 | 13.4 | 56.8 | ||||
| S(F)11-16000/66 | 16000 | 9~11 | 33 | 6000×4400×4600 | 16.1 | 69.8 | ||||
| S(F)11-20000/66 | 20000 | 9~11 | 36 | 6100×4500×4800 | 19.2 | 84.6 | ||||
| S(F)11-25000/66 | 25000 | 9~11 | 43 | 6500×4500×5000 | 22.7 | 100 | ||||
| S(F)11-31500/66 | 31500 | 9~11 | 49 | 6600×4600×5200 | 26.9 | 120 | ||||
| S(F)11-40000/66 | 40000 | 9~11 | 59 | 6800×4800×5300 | 32.2 | 141 | ||||
| S(F)11-50000/66 | 50000 | 10~12 | 69 | 7000×5000×5500 | 38 | 167 | ||||
| S(F)11-63000/66 | 63000 | 10~12 | 75 | 7400×5300×5700 | 44.9 | 198 |
Contact us for detailed specifications, loss charts, and installation guidelines for all 66 kV transformers.
Why Buy Our 66kV Oil-Immersed Distribution Transformer
Short-Circuit Testing
All of our transformers undergo a comprehensive short-circuit test to verify their ability to withstand network faults, thus ensuring the safety and reliability of the entire electrical distribution system.
Energy Efficiency Certification
Each of our transformers meets or exceeds the loss limits as defined by GB 6451-2008, and this is substantiated through routine and type testing of each transformer prior to shipment.
Factory Direct Pricing
As an experienced and specialised manufacturer of 66 kV transformers, we sell at prices significantly lower than our competitors due to the absence of any channel markup.
Dependable Delivery
We have an eight to twelve-week lead time for standard delivery of 66 kV transformers and offer expedited production for emergency power supply needs whenever possible.
Certifications and Standards
GB 6451-2008
IEC 60076
ISO 9001
CE
IEEE C57.12
IEC 60076
ISO 9001
CE
IEEE C57.12
Buyer’s Guide
How This 66kV Oil-Immersed Distribution Transformer Works
Helpful information for EPCs, grid operators, and industrial buyers when selecting a 66kV transformer for use in medium-voltage electrical networks.
Project Applications
Type 1 S(F)11-10000/66 through S(F)11-40000/66 are ideal transformers for dedicated substations to supply continuous transformers for buildouts at large industrial parks establishing their power distribution networks. Type 1 transformers are also perfect for use in mining projects, where their strong short-circuit capabilities can withstand the rapid and unpredictable changes in load experienced during crushing and conveying operations. The reliability of the S(F)11-10000/66 through S(F)11-40000/66 transformers will support the development of critical energy infrastructure, including ports and rail transportation hubs.
Capacity and Voltage Selection
The best way to select rated capacity is to add anticipated demand with an acceptable overload factor to arrive at the least amount of capacity required. For low-voltage applications, standard low-voltage voltage options range from 3.15 kV to 10.5 kV. Be sure to select the low-voltage voltage rating that matches your downstream switchgear. The high-voltage tapping range of ±2 x 2.5% allows flexibility for future adjustments to the grid without de-energizing the transformer.
Installation and Maintenance
Transformers must be installed on an adequately reinforced concrete plinth constructed to provide an oil containment area and adequate clearance away from surrounding buildings and structures. The tank is constructed of sealed corrugated steel requiring little or no oil maintenance beyond routine inspections of bushings, oil levels, and temperature indicators for the life of the transformer.
Frequently Asked Questions
What is a 66kV substation?
A 66kV substation is a medium-voltage facility that steps down 66 kilovolts to lower distribution voltages (e.g., 33kV, 11kV, or 6.6kV) using power transformers. It is commonly found in industrial grids, mining areas, and regional distribution networks.
What is 66kV to 33kV transformer?
A 66kV to 33kV transformer is a step-down unit that reduces 66kV input to 33kV output. Our 66kV range can be configured for such voltages by selecting the appropriate low-voltage winding (e.g., 33kV as a secondary option) — contact us for custom ratios.
What is the price of 66 kVA transformer?
The price of a 66kV transformer depends on capacity (6300kVA to 63000kVA in our range), impedance, and accessories. For an accurate quotation, please provide your technical requirements. As a manufacturer, we offer factory-direct pricing with no middleman markup.
What is kV on a transformer?
kV stands for kilovolt (1 kV = 1000 volts) and indicates the voltage rating of a transformer winding. For example, a 66kV transformer has a primary winding designed to operate at 66,000 volts. The kV rating is critical for matching grid voltage levels and ensuring safe insulation coordination.
