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SF-3000
YAWEI
The 3MVA 11.5kV/480V Three Phase Oil Immersed Power Transformer Dyn1 is a high-performance power distribution solution designed for reliable voltage transformation in industrial, commercial, and utility power systems. With a rated capacity of 3MVA, 11.5kV primary voltage, 480V secondary voltage, and Dyn1 vector group, the transformer provides stable and efficient power distribution for medium- and low-voltage applications.
The transformer adopts a high-quality cold-rolled grain-oriented silicon steel (CRGO) core and high-purity copper windings to reduce electrical losses and improve overall operating efficiency. Its ONAN natural oil circulation cooling system provides effective heat dissipation during continuous operation. The robust oil immersed structure offers excellent insulation performance, mechanical strength, and environmental adaptability.
Suitable for industrial power supply, commercial facilities, municipal distribution networks, and heavy-load electrical systems, the transformer can be customized according to different voltage, protection, monitoring, and installation requirements.
The optimized magnetic core and winding structure help reduce no-load and load losses while improving overall energy efficiency. High-quality CRGO silicon steel and copper windings provide reliable electrical performance and stable operation under rated loads, helping reduce long-term energy consumption.
The transformer features a reinforced tank and carefully engineered internal winding structure to provide high mechanical strength and reliable resistance to electrical and mechanical stresses. The 6.39% short-circuit impedance is designed to support stable voltage performance and improved short-circuit withstand capability.
The transformer uses an ONAN (Oil Natural Air Natural) cooling system, allowing natural circulation of insulating oil to transfer heat from the windings and core to the external cooling surfaces. This simple and reliable cooling method provides effective thermal management with reduced auxiliary equipment requirements.
High-quality insulating oil and carefully designed insulation structures provide effective dielectric protection for the core and windings. The Dyn1 vector group enables reliable three-phase power system integration and makes the transformer suitable for a wide range of industrial and distribution applications.
The transformer can be equipped with various monitoring and protection devices according to project requirements, including:
• Oil temperature monitoring
• Winding temperature monitoring
• Oil level indication
• Pressure relief device
• Buchholz relay where applicable
• Overcurrent and short-circuit protection
• Lightning and surge protection
• Optional intelligent monitoring systems
These configurations help operators monitor transformer operating conditions and improve maintenance efficiency.
The oil immersed design provides effective insulation and heat dissipation while the robust tank structure helps protect internal components from external environmental conditions. Qualified insulating oil and properly sealed components help minimize the risk of oil leakage and maintain reliable long-term operation.
The 3MVA 11.5kV/480V Three Phase Oil Immersed Power Transformer Dyn1 is an ideal solution for industrial plants, commercial buildings, municipal power distribution, utility networks, and other applications requiring dependable medium-voltage to low-voltage power transformation.
>> Technical Parameters
| Type | Three Phase Oil-immersed Distribution Transformer |
| Model | SF-M-3000 |
| Installation | Outdoor |
| Altitude | ≤1000m |
| Rated Power | 3000KVA or others |
| Cooling Method | ONAN/KNAN |
| Primary Voltage | 11.5KV |
| Secondary Voltage | 0.433kV or customizable |
| Rated Frequence | 50/60Hz |
| Insulation oil | Mineral oil |
| Tapping Range | +2×2.5% |
| Temperature rise C | 65 |
| Connection Group | Dyn11 |
The 3MVA 11.5kV/480V Three Phase Oil Immersed Power Transformer is suitable for factories, manufacturing facilities, processing plants, and industrial parks requiring reliable medium-voltage power distribution. It transforms 11.5kV grid power to 480V for production equipment, motors, machinery, and auxiliary electrical systems. Its robust construction and efficient cooling system support stable operation under continuous and variable industrial loads.
The transformer is suitable for shopping centers, office buildings, hotels, commercial complexes, and large facilities requiring dependable 480V power distribution. It can supply electrical systems including HVAC equipment, elevators, lighting, pumps, fire protection systems, and other commercial loads, providing stable voltage transformation for modern building power networks.
The 3MVA transformer can be deployed in urban distribution networks, residential developments, community substations, and municipal grid upgrade projects. Its 11.5kV to 480V voltage transformation provides reliable low-voltage power for residential buildings, public facilities, and community infrastructure while supporting efficient regional power distribution.
The transformer can be integrated into solar photovoltaic, wind power, energy storage, and other distributed energy projects where medium-voltage and low-voltage power conversion is required. Its flexible configuration allows it to support different project requirements for renewable energy collection, local power distribution, and grid-connected electrical systems.
The transformer is suitable for hospitals, schools, transportation facilities, water treatment plants, public buildings, and other important municipal infrastructure. Its reliable insulation system, robust mechanical construction, and optional monitoring and protection equipment help provide stable power transformation for facilities with demanding electrical requirements.
The following guide provides general installation, commissioning, operation, and maintenance instructions for the 3MVA 11.5kV/480V Three Phase Oil Immersed Power Transformer Dyn1. All electrical installation, testing, commissioning, and maintenance work should be performed by qualified personnel in accordance with the manufacturer's technical documents and applicable safety regulations.
Transport the transformer using suitable lifting and handling equipment. Keep the unit in the recommended position and avoid severe vibration, impact, collision, or improper lifting. Use the designated lifting points shown in the manufacturer's drawings.
After delivery, inspect the transformer for transportation damage, oil leakage, deformation, damaged bushings, loose components, and missing accessories. Check the nameplate, packing list, factory test documents, and accessories before installation.
If installation is delayed, store the transformer in a clean, dry, and well-ventilated location. Protect bushings, control devices, and other electrical components from moisture, dust, and mechanical damage. Follow the manufacturer's instructions for oil preservation during extended storage.
Install the transformer on a properly designed and level foundation with adequate load-bearing capacity. Provide sufficient ventilation, drainage, electrical clearance, grounding, and maintenance space. The installation environment should comply with the specified ambient temperature, altitude, humidity, pollution level, and other requirements stated in the technical documentation.
Connect the high-voltage and low-voltage terminals according to the approved wiring diagrams and transformer nameplate. Check phase sequence, cable connections, grounding, protection circuits, and control wiring before energization. All electrical connections must be properly tightened and insulated.
Depending on the configuration, the transformer may include:
• High-voltage and low-voltage bushings
• Oil tank and cooling equipment
• Oil level indicator
• Temperature indicators
• Pressure relief device
• Buchholz relay where applicable
• Grounding terminals
• Tap changer
• Drain and sampling valves
• Protection and monitoring devices
Before operation, confirm that the transformer is correctly installed, grounded, and connected. Check oil level, temperature indicators, cooling equipment, protection devices, and tap changer position. During normal operation, monitor voltage, current, oil temperature, winding temperature, and abnormal noise or vibration.
Where fuses are included in the transformer protection system, install the specified fuse type and rating according to the manufacturer's electrical drawings. Ensure that the circuit is isolated and de-energized before replacing or inspecting fuses.
Before commissioning and during scheduled maintenance, measure the DC resistance of the transformer windings using appropriate test equipment. Compare the measured values with factory test data and applicable technical requirements. Significant deviations should be investigated before energization.
Perform insulation and withstand voltage tests according to the applicable standards, project specifications, and manufacturer's test procedures. Ensure that all sensitive monitoring and protection devices are properly isolated or protected during testing when required.
Verify the transformer turns ratio and vector group before commissioning. The measured ratio should correspond with the nameplate specifications and the selected tap position. Check all phases and tap positions as required.
Before energization, confirm that all installation, grounding, protection, and testing procedures have been completed. Energize the transformer according to the manufacturer's commissioning procedure. Monitor voltage, current, oil level, temperature, noise, and protection signals during initial operation. Gradually introduce load after confirming normal operating conditions.
Before inspection or maintenance, disconnect the transformer from all power sources and apply appropriate lockout/tagout procedures. Verify that the transformer is fully de-energized and safely grounded. Allow sufficient cooling time before performing maintenance or opening any components.
Regularly inspect oil level, oil temperature, bushings, grounding connections, cooling equipment, tank condition, valves, and protection devices. Check for oil leakage, abnormal noise, overheating, corrosion, or other unusual conditions. Perform insulating oil testing and electrical tests according to operating conditions and maintenance schedules.
Inspect and maintain the tap changer, bushings, temperature indicators, pressure relief devices, cooling equipment, monitoring systems, and other accessories according to the manufacturer's maintenance requirements. Keep electrical contacts, terminals, and control components clean and securely connected.
Only use approved replacement components that match the original technical specifications. Before replacement, isolate and de-energize the transformer and follow the applicable safety procedures. After replacement, perform the necessary electrical and functional tests before returning the transformer to service.
Important: This guide provides general operating information only. Actual transportation, installation, testing, commissioning, maintenance, and component replacement procedures should always follow the manufacturer's official drawings, technical specifications, factory test reports, and applicable local electrical safety regulations.
