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SF-M-2500/3000
YAWEI
The SF-M-2500/3000kVA 4.16kV 0.6kV 0.347kV Dyn1 Oil Immersed Distribution Transformer is engineered for medium-voltage power distribution where dependable voltage conversion, thermal stability, and continuous-duty performance are essential. With a primary voltage of 4.16kV and a secondary system of 0.6kV/0.347kV, the transformer is designed for large industrial facilities, commercial power systems, utility distribution networks, and other high-capacity electrical installations.
The transformer uses an optimized magnetic circuit with cold-rolled grain-oriented electrical steel to control core losses and improve operating efficiency. The winding arrangement is designed to withstand normal load conditions as well as the mechanical forces associated with short-circuit events. High-quality insulating materials and transformer oil provide electrical insulation between the active components while also assisting with heat transfer.
An ONAN (Oil Natural Air Natural) cooling arrangement can be adopted for continuous operation without relying on complicated auxiliary cooling equipment. The Dyn1 vector group provides a defined phase relationship between the high- and low-voltage systems and allows the transformer to be integrated into suitable three-phase distribution networks.
The transformer can be configured according to project requirements, including voltage ratio, tap range, winding material, cooling arrangement, protection devices, monitoring equipment, enclosure configuration, and applicable electrical standards.
The magnetic core is manufactured from high-grade grain-oriented electrical steel with carefully controlled joints and flux density. This design helps limit no-load losses and operating temperature while maintaining stable excitation characteristics.
The core and winding assembly are mechanically secured to improve resistance against transportation forces, electromagnetic stress, and long-term vibration.
Designed for 2500kVA to 3000kVA class applications, the transformer incorporates a robust winding structure suitable for substantial continuous loads. The winding arrangement can be engineered using copper or aluminum conductors according to the required electrical and economic specifications.
The insulation system is coordinated with the rated voltage and operating environment to provide reliable dielectric strength throughout the service life of the transformer.
The ONAN cooling system transfers heat generated by the core and windings through natural oil circulation and releases it through the tank and radiating surfaces.
This passive cooling principle minimizes the number of auxiliary components and provides a straightforward solution for installations where dependable continuous operation is required.
The transformer is designed for applications requiring conversion from a 4.16kV medium-voltage supply to a 600V/347V low-voltage system.
This voltage combination is commonly applicable to large electrical installations where medium-voltage incoming power needs to be distributed to low-voltage switchgear, motors, process equipment, building services, and other downstream loads.
The transformer ratio and tap arrangement can be adjusted to meet project-specific voltage requirements.
The Dyn1 connection group provides a defined phase displacement between the primary and secondary windings and incorporates a neutral point on the low-voltage side.
This configuration can be selected for suitable three-phase distribution systems where the downstream network requires a neutral connection. Final vector-group selection should always be coordinated with the project single-line diagram and system protection requirements.
Depending on the project specification, the transformer can be supplied with a range of monitoring and protection accessories, such as:
Oil temperature indicator
Winding temperature indicator
Oil level gauge
Pressure relief device
Buchholz relay where applicable
Drain and oil sampling valves
Grounding terminals
Surge protection
Overcurrent protection
Short-circuit protection
Remote monitoring interfaces
Optional digital transformer monitoring systems
The final accessory configuration can be selected according to the installation environment and protection scheme.
The oil tank and external structure are designed for reliable operation in demanding installation environments. Protective coatings and suitable sealing arrangements can be selected according to climate, pollution level, corrosion conditions, and outdoor installation requirements.
The transformer can be supplied as an outdoor unit with suitable lifting provisions, grounding arrangements, terminal configurations, and maintenance access.
Transformer specifications can be customized according to the customer's electrical system rather than being limited to a fixed standard configuration.
Available engineering options may include:
Rated capacity
Primary and secondary voltage
Tap range
Vector group
Impedance voltage
Copper or aluminum windings
Cooling method
Frequency
Insulation level
Temperature-rise requirements
Protection and monitoring equipment
Terminal arrangement
Enclosure and installation configuration
This flexibility allows the transformer to be integrated into new substations as well as existing electrical distribution systems.
>> Technical Parameters
| Type | Three Phase Oil-immersed Distribution Transformer |
| Model | SF-M-2500/3000 |
| Installation | Outdoor |
| Altitude | ≤1000m |
| Rated Power | 3000KVA or others |
| Cooling Method | ONAN/KNAN |
| Primary Voltage | 4.16KV |
| Secondary Voltage | 0.6/0.347kV |
| Rated Frequence | 60Hz |
| Insulation oil | Mineral oil |
| Tapping Range | ±2×2.5% |
| Temperature rise C | 65 |
| Connection Group | Dyn1 |
The transformer can provide medium-voltage to low-voltage power conversion for factories, processing plants, production lines, and industrial parks. The 4.16kV input can be converted to a 600V/347V distribution system for motors, machinery, process equipment, HVAC systems, pumps, and auxiliary loads.
High-capacity oil immersed transformers are suitable for electrical systems serving mining operations, material-processing facilities, metalworking plants, and other heavy-duty environments.
The reinforced internal structure and natural-oil cooling arrangement provide a practical configuration for installations where electrical equipment may operate for extended periods under substantial loads.
The transformer can be integrated into the electrical infrastructure of large commercial facilities, shopping centers, office complexes, hotels, campuses, and other high-load buildings.
The 600V/347V secondary system can supply downstream switchboards and electrical equipment according to the building's power distribution design.
The unit can be used in medium-voltage distribution systems and customer substations where a 4.16kV supply must be converted to a lower utilization voltage.
It can be configured to meet the electrical characteristics, installation conditions, protection requirements, and operating practices of different distribution projects.
The transformer can be considered for data centers and other facilities with concentrated electrical demand, subject to the project's voltage, redundancy, harmonic, protection, and cooling requirements.
Its high-capacity configuration allows it to serve large low-voltage distribution systems while supporting integration with switchgear and downstream power management equipment.
The transformer can also be incorporated into solar power, energy storage, microgrid, and distributed-energy installations where medium-voltage and low-voltage systems need to be interconnected.
The exact transformer configuration should be selected according to the project's power flow, grid connection, harmonics, protection coordination, and operating requirements.
Potential applications include water treatment plants, transportation infrastructure, hospitals, educational campuses, municipal facilities, and other large electrical installations requiring reliable medium-voltage power conversion.
The following information provides general guidance for transportation, installation, commissioning, operation, and maintenance of the SF-M-2500/3000kVA 4.16kV 0.6kV 0.347kV Dyn1 Oil Immersed Distribution Transformer.
All work involving high-voltage equipment must be performed by appropriately qualified personnel. The manufacturer's approved drawings, technical specifications, factory test reports, applicable standards, and local electrical regulations take precedence over this general guide.
Use appropriate lifting and transportation equipment according to the transformer weight and dimensions. Keep the transformer in the specified transportation position and prevent severe impact, tilting, vibration, or uncontrolled movement.
Only use the designated lifting points shown on the manufacturer's drawings.
After delivery, inspect the transformer before moving it to the installation position.
Check for:
Tank deformation
Oil leakage
Damaged bushings
Damaged gauges or accessories
Loose external components
Damaged paint or corrosion
Missing accessories
Shipping damage
Verify the nameplate information against the purchase order and technical documentation.
If commissioning is postponed, place the transformer in a suitable storage area protected from unnecessary moisture, contamination, and mechanical damage.
Keep bushings, indicators, control components, and other accessories protected during storage. Long-term storage requirements should follow the manufacturer's instructions.
Install the transformer on a level foundation designed to withstand the total equipment weight and operating conditions.
Adequate clearance should be maintained around the transformer for:
Electrical safety
Ventilation
Inspection
Oil sampling
Maintenance
Lifting and handling
The foundation and drainage arrangement should also comply with the project design.
Connect the transformer tank and designated grounding points to the site grounding system before energization.
Grounding conductors and connections must be appropriately sized, mechanically secure, and electrically continuous.
Connect the 4.16kV high-voltage side and 0.6kV/0.347kV low-voltage side according to the approved wiring diagram and nameplate.
Before energization, verify:
Phase identification
Terminal connections
Cable tightening
Neutral connection
Grounding
Phase sequence
Protection wiring
Tap position
Confirm that the tap changer is positioned correctly before energization.
For an off-circuit tap changer, all switching operations must be performed only when the transformer is fully de-energized and isolated.
The applicable tap range and operating procedure must follow the transformer nameplate and manufacturer's documentation.
Before putting the transformer into service, perform the required electrical and mechanical checks.
Typical commissioning tests may include:
Insulation resistance
Winding DC resistance
Transformer turns ratio
Vector group verification
Insulation power-factor testing where required
Dielectric or withstand testing where specified
Grounding continuity
Protection-device functional checks
Test results should be compared with factory test data and the applicable project requirements.
Check the transformer oil level and inspect the tank, valves, bushings, and joints for signs of leakage.
Where required, take an insulating-oil sample for laboratory testing. Oil quality should be evaluated according to the applicable standard and the manufacturer's maintenance recommendations.
Before energization, confirm that all required installation and commissioning checks have been completed.
Energize the transformer according to the approved commissioning procedure and observe:
Primary voltage
Secondary voltage
Load current
Oil temperature
Abnormal noise
Vibration
Oil level
Protection alarms
If abnormal conditions are detected, disconnect the transformer according to the site emergency procedure and investigate the cause.
During service, periodically monitor transformer loading, voltage, temperature, oil level, and protection indications.
Avoid operating the transformer continuously beyond its specified ratings unless an approved overload assessment has been completed.
Record significant operating abnormalities for subsequent inspection.
Maintenance intervals should be determined according to operating hours, loading conditions, environment, manufacturer recommendations, and applicable standards.
Routine inspection may include:
Oil level
Oil temperature
Bushing condition
Tank condition
Oil leakage
Grounding connections
Cable terminals
Cooling surfaces
Pressure relief equipment
Temperature indicators
Protection devices
Periodic electrical testing can be used to evaluate transformer condition.
Depending on the project maintenance program, tests may include winding resistance, insulation resistance, turns ratio, insulation oil quality, and other diagnostic measurements.
Any significant change from previous test results should be investigated by qualified personnel.
Inspect temperature indicators, oil level gauges, pressure relief devices, Buchholz relays where fitted, tap changers, valves, bushings, and monitoring equipment according to their individual maintenance requirements.
Replace damaged components only with technically compatible parts approved by the manufacturer.
Before any internal inspection, electrical testing, or repair work, isolate the transformer from all energy sources.
Apply the required lockout/tagout (LOTO) procedures, verify the absence of voltage, discharge stored energy, and establish protective grounding where required.
Do not open or service the transformer while it remains energized.
Replacement work must be carried out by qualified technicians using approved components.
After replacement, perform the necessary mechanical, electrical, and functional checks before returning the transformer to service.
Important: This page provides general product and operating information. Actual transformer installation, testing, commissioning, operation, maintenance, and repair must be performed according to the manufacturer's approved technical documentation, project specifications, applicable electrical standards, and local safety regulations.
