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The 4000kVA 4.16kV to 600V oil immersed three-phase distribution power transformer is developed for medium-voltage power distribution in industrial facilities, commercial buildings, and other high-load electrical systems. It is designed to step down a 4.16kV supply to 600V for reliable power delivery to downstream equipment.
The transformer uses a high-quality magnetic core and carefully designed windings to achieve stable electrical performance and efficient operation. Mineral insulating oil is used for insulation and heat dissipation, allowing the transformer to maintain suitable operating temperatures under continuous loading.
With a 4000kVA rated capacity, 4.16kV primary voltage, and 600V secondary voltage, this transformer is suitable for applications where a large amount of low-voltage power is required from a medium-voltage source. The Dyn11 vector group provides a suitable phase relationship for common three-phase distribution systems.
Depending on the project requirements, the transformer can be supplied with different tap arrangements, impedance values, protection devices, monitoring equipment, and other accessories. Technical parameters can also be adjusted according to the customer's electrical system and installation conditions.
Main Specifications:
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S-M-4000
YAWEI
The 4000kVA 4.16kV to 600V Oil Immersed Three Phase Distribution Power Transformer is designed for medium-voltage power distribution in industrial plants, commercial facilities, and other electrical systems requiring high-capacity low-voltage power supply. With a rated capacity of 4000kVA, a primary voltage of 4.16kV, and a secondary voltage of 600V, the transformer is used to step down medium-voltage power for downstream electrical equipment and distribution systems.
The transformer is manufactured with a cold-rolled grain-oriented silicon steel (CRGO) core and copper windings. The core and winding arrangement is designed to control transformer losses while maintaining stable electrical and mechanical performance. An ONAN (Oil Natural Air Natural) cooling system provides natural heat dissipation during normal operation without the need for forced cooling equipment.
The transformer can be configured according to the requirements of different projects, including tap arrangements, impedance, vector group, protection devices, temperature monitoring equipment, oil level indicators, pressure relief devices, and other accessories.
The transformer uses CRGO silicon steel for the magnetic core and copper conductors for the windings. The selected materials and optimized winding structure help control no-load and load losses while providing stable electrical performance.
The internal active-part structure is designed to provide appropriate insulation clearances, mechanical strength, and heat transfer characteristics for continuous transformer operation.
With a rated capacity of 4000kVA, this transformer is suitable for applications where a large low-voltage power supply is required from a medium-voltage source.
The 4.16kV to 600V voltage conversion makes the transformer suitable for industrial distribution systems, large commercial facilities, manufacturing plants, and other high-load applications.
The transformer can also be configured with different connection groups and impedance values according to the requirements of the customer's electrical system.
The transformer adopts an ONAN (Oil Natural Air Natural) cooling arrangement. During operation, insulating oil circulates naturally inside the tank and transfers heat generated by the core and windings to the external cooling surfaces.
The simple cooling structure reduces the need for auxiliary cooling equipment and provides a practical solution for continuous operation under normal rated conditions.
The oil immersed construction provides both electrical insulation and heat dissipation for the transformer's active components. The insulation structure is designed according to the rated voltage and electrical characteristics of the transformer.
High-quality insulating materials and transformer oil are used to maintain the required dielectric performance during operation.
The final insulation system and clearances can be adjusted according to the applicable standards and project specifications.
The transformer tank and internal active-part structure are designed to withstand the mechanical stresses that may occur during transportation, installation, and normal operation.
The transformer impedance can be selected according to the system requirements. The specified impedance is also considered during system fault-current calculations and coordination with downstream protection equipment.
Depending on the project requirements, the transformer can be equipped with various protection and monitoring devices, including:
Oil temperature indicator
Winding temperature indicator
Oil level indicator
Pressure relief device
Buchholz relay, where applicable
Oil drain and sampling valves
Surge protection
Overcurrent and short-circuit protection
Optional transformer monitoring system
The protection configuration can be selected according to the installation environment, operating conditions, and customer's electrical protection scheme.
The transformer can be customized to meet different power distribution requirements. Available configurations may include:
Different tap ranges and tap changer arrangements
Customized vector groups
Specified short-circuit impedance
Different cooling arrangements
Temperature monitoring systems
Oil level and pressure monitoring
Conservator tank and radiator configurations
Additional protection and control accessories
All major technical parameters can be reviewed and confirmed during the engineering and drawing approval stage.
>> Technical Parameters
| Type | Three Phase Oil-immersed Distribution Transformer |
| Model | S-M-4000 |
| Installation | Outdoor |
| Altitude | ≤1000m |
| Rated Power | 4000KVA or others |
| Cooling Method | ONAN/KNAN |
| Primary Voltage | 4.16KV |
| Secondary Voltage | 0.4kV or customizable |
| Rated Frequence | 50/60Hz |
| Insulation oil | Mineral oil |
| Tapping Range | +2×2.5% |
| Temperature rise C | 65 |
| Connection Group | Dyn11 |
The 4000kVA 4.16kV to 600V Oil Immersed Three Phase Distribution Power Transformer is suitable for factories, manufacturing plants, processing facilities, industrial parks, and other high-load electrical installations. It converts 4.16kV medium-voltage power to 600V for production machinery, motors, pumps, compressors, and auxiliary electrical equipment. The oil immersed construction and ONAN cooling system are suitable for continuous operation under varying industrial loads.
The transformer can be used in large commercial buildings, shopping centers, hotels, office complexes, and other facilities requiring a high-capacity 600V power supply. It can serve HVAC systems, elevators, pumps, lighting systems, fire protection equipment, and other building services through an appropriate low-voltage distribution network.
With a 4.16kV primary voltage and 600V secondary voltage, the transformer can be installed in local power distribution systems where medium-voltage electricity needs to be supplied to downstream low-voltage loads. It is suitable for substations, infrastructure projects, commercial developments, and other applications requiring centralized power transformation.
The transformer can be incorporated into solar PV, battery energy storage, distributed generation, and other renewable energy systems where medium-voltage and low-voltage power conversion is required. Its technical configuration can be adjusted according to the voltage level, connection arrangement, protection requirements, and operating conditions of the project.
The transformer is also suitable for water treatment plants, transportation facilities, public buildings, schools, hospitals, and other infrastructure projects requiring dependable power distribution. Additional monitoring and protection equipment can be supplied according to the project's electrical design and operating requirements.
The 600V secondary output makes the transformer suitable for electrical systems supplying large motors, pumps, compressors, production lines, and other industrial equipment. The transformer parameters can be coordinated with downstream switchgear, motor control equipment, VFDs, and protection systems to meet the requirements of the complete electrical installation.
The following guide provides general instructions for the installation, commissioning, operation, and maintenance of the 4000kVA 4.16kV to 600V Oil Immersed Three Phase Distribution Power Transformer. All transportation, electrical installation, testing, commissioning, inspection, and maintenance work should be carried out by qualified personnel in accordance with the manufacturer's technical documentation, approved drawings, applicable standards, and local safety regulations.
Use suitable lifting, loading, and transportation equipment according to the transformer weight and dimensions. Keep the transformer in the specified transportation position and avoid excessive vibration, impact, tilting, or collision during handling.
Use only the designated lifting and jacking points indicated on the manufacturer's drawings. Do not lift the transformer by its bushings, radiators, valves, or other components that are not designed for lifting.
Inspect the transformer immediately after arrival at the installation site. Check the tank, bushings, radiators, valves, accessories, and other external components for signs of transportation damage or deformation.
Verify the equipment nameplate, packing list, factory test certificate, technical documents, and supplied accessories. Any oil leakage, damaged component, missing accessory, or abnormal condition should be recorded and reported before installation.
When immediate installation is not possible, place the transformer in a suitable storage area protected from excessive moisture, dust, contamination, and mechanical damage.
Keep bushings, control equipment, monitoring devices, and other electrical components properly protected. For extended storage periods, maintain the transformer in accordance with the manufacturer's oil preservation and storage requirements.
Install the transformer on a level foundation designed to support its operating weight and mechanical loads. The foundation should provide adequate stability, drainage, ventilation, and access for inspection and maintenance.
Maintain the required electrical clearances around high-voltage and low-voltage terminals. Provide a reliable grounding system and sufficient working space around the transformer.
The installation environment should remain within the ambient temperature, altitude, humidity, pollution level, and other conditions specified in the approved technical documentation.
Connect the 4.16kV high-voltage side and 600V low-voltage side according to the approved electrical drawings, wiring diagrams, and transformer nameplate.
Before energization, verify:
Phase sequence and phase identification
High-voltage cable connections
Low-voltage cable or busbar connections
Grounding connections
Protection circuits
Control and monitoring wiring
Tap changer position
Tightness of electrical terminals
All connections should be properly tightened, insulated, and checked before the transformer is energized.
Depending on the selected configuration, the transformer may be supplied with:
High-voltage and low-voltage bushings
Oil tank and radiators
Oil level indicator
Oil temperature indicator
Winding temperature indicator
Pressure relief device
Buchholz relay, where applicable
Grounding terminals
Tap changer
Oil drain and sampling valves
Lifting and jacking facilities
Protection and monitoring equipment
The actual configuration shall be based on the approved transformer drawings and technical specification.
Before putting the transformer into service, check the oil level, bushings, grounding system, cooling equipment, protection devices, valves, and tap changer.
Confirm that the selected tap position corresponds to the required operating voltage. Check that no tools, temporary grounding devices, or foreign objects remain around the transformer.
During initial operation, observe the transformer for abnormal temperature rise, oil leakage, unusual noise, excessive vibration, or protection alarms.
Where fuses are included in the associated protection system, use only the specified type and rating.
Before inspecting or replacing a fuse, disconnect and isolate the relevant circuit and verify that it is completely de-energized. Protection settings should be coordinated with the transformer rated capacity, system fault level, and downstream equipment.
Measure the DC resistance of the high-voltage and low-voltage windings using a suitable test instrument before commissioning or during scheduled maintenance.
Record the measured values for each phase and compare them with the factory test results and applicable technical requirements. Any significant deviation between phases or from the factory data should be investigated before the transformer is energized.
Perform insulation resistance and withstand voltage tests in accordance with the applicable standards, project requirements, and manufacturer's test procedures.
Before testing, identify equipment that could be affected by the test voltage and isolate or protect such devices as required. After testing, ensure that the transformer is properly discharged and restored to its normal configuration.
Verify the transformer turns ratio before commissioning. Test all phases and relevant tap positions as specified in the test procedure.
The measured ratio should correspond with the transformer nameplate and selected tap position. The vector group and phase relationship should also be verified to ensure compatibility with the connected electrical system.
Before energization, confirm that installation, grounding, electrical testing, protection checks, and commissioning procedures have been completed.
Energize the transformer in accordance with the approved commissioning procedure. During the initial energization period, monitor:
High-voltage and low-voltage voltage
Load current
Oil temperature
Winding temperature
Oil level
Abnormal noise or vibration
Protection and alarm signals
After confirming normal operation, gradually apply the load and continue monitoring the transformer.
Before inspection, repair, or internal maintenance, disconnect the transformer from all electrical power sources.
Apply appropriate lockout/tagout (LOTO) procedures, verify the absence of voltage, and install protective grounding where required. Allow the transformer to cool sufficiently before carrying out maintenance or opening any components.
Establish a regular inspection and maintenance schedule according to the operating environment and manufacturer's recommendations.
Regularly inspect:
Transformer oil level
Oil temperature
Bushings
Grounding connections
Radiators and cooling surfaces
Tank and valve condition
Oil leakage
Protection devices
Monitoring equipment
Abnormal noise or vibration
Insulating oil testing, electrical measurements, and other diagnostic tests should be performed at appropriate intervals based on operating conditions and maintenance requirements.
Inspect and maintain the tap changer, bushings, temperature indicators, pressure relief device, cooling equipment, oil level indicator, and monitoring system according to the manufacturer's maintenance instructions.
Check electrical terminals, control wiring, contacts, and grounding connections for looseness, contamination, oxidation, or other abnormal conditions.
Replacement parts should match the original equipment specifications and be approved for use with the transformer.
Before replacing any component, isolate and de-energize the transformer and verify safe working conditions. After replacement, carry out the required electrical, mechanical, and functional checks before returning the transformer to service.
This guide is intended as general technical information for the 4000kVA 4.16kV to 600V Oil Immersed Three Phase Distribution Power Transformer. It does not replace the manufacturer's approved drawings, technical specifications, factory test reports, installation instructions, or local electrical regulations.
Actual transportation, installation, testing, commissioning, operation, maintenance, and component replacement procedures shall always be performed by qualified personnel and shall follow the approved project documentation, manufacturer's instructions, applicable IEC/ANSI standards, and local electrical safety requirements.
