50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution
The 50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution is engineered to deliver high efficiency, stable voltage regulation, and long-term service reliability in medium-voltage distribution networks. Designed for outdoor installation, the transformer features a robust oil-immersed cooling system, high-grade silicon steel core, and pure copper windings to ensure excellent thermal performance and low-loss characteristics. Its rugged, weatherproof construction withstands harsh climates, ensuring continuous operation in industrial plants, utility grids, mining sites, and renewable energy distribution stations. With optimized insulation, superior dielectric strength, and advanced protection configurations, the transformer offers enhanced safety and reduced maintenance. This unit is ideal for step-down power distribution scenarios requiring consistent performance and dependable energy delivery.
- Primary Voltage Ratings 69kV 66kV 63kV or others
- Secondary Voltage Ratings 33/13.8/11 kV or customized
- H.V. Tap Range ±8×1.25% or others
- Type Oil-immersed power transformer
- BIL Up to 350kV
- Standards IEEE, ANSI, IEC, CSA
- Application utility distribution networks, industrial facilities, mining sites, and renewable energy projects
- Power Rating 250-1000kVA
- Certificate UL ,CESI ,ISO
- Cooling Method ONAN/ ONAF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution
Technical Specifications
Accessories
| Rated Power | 250-1000kVA |
| Rating Primary Voltage | 50kV 69kV 66kV 63kV or others |
| Secondary Voltage |
33kV 13.8kV 11kV Customized |
| Frequency | 50/60Hz |
| Vector Group | Dyn11, YNd1, Dyn1, YNd11 or others |
| Winding Material | Aluminum/Copper |
| Efficiency | As IEEE, CAS Std or Customized |
| Impedance Voltage | As IEC |
| Altitude | ≤1,000m or Customized |
| Enclosure material | Mid Steel |
| HV Bushing |
| LV Bushing |
| OLTC/NLTC |
| Lifting hook for complete transformer |
| Name plate |
| Oil temperature |
| Winding temperature |
| Radiators |
| Oil level |
| Pressure relief valve |
| CT |
Customization Optional
50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution
We offer comprehensive customization options for the 50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution to meet diverse regional standards, application requirements, and installation environments. Customers may specify primary and secondary voltage ratings, vector groups, impedance levels, cooling methods, and load loss parameters. Transformer oil type, insulation class, bushing configuration, and tap-changer selection (on-load or off-load) can also be tailored to ensure compatibility with grid specifications and operational demands. Protection accessories such as temperature controllers, pressure relief devices, gas relays, and monitoring sensors are fully configurable to enhance safety and operational visibility.
Additionally, the transformer enclosure can be customized with anti-corrosion coatings, weatherproof housings, high-altitude adaptations, seismic-resistant designs, and noise-reduction features. Clients may choose from varying tank structures, radiator types, lifting lugs, cable boxes, and terminal arrangements for optimized installation. Our engineering team provides individualized design support to ensure that every customized transformer delivers superior efficiency, durability, and long-term stability in demanding outdoor environments.
Packing and Shipping
50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution
The 50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution is packaged using industry-standard, reinforced export protection to ensure safe delivery from the manufacturing facility to the project site. Each transformer undergoes full surface cleaning and anti-corrosion treatment before packing. The tank body is securely sealed, and all accessories are individually wrapped to prevent moisture, dust, and mechanical impact during transportation. High-density wooden pallets or steel-frame bases are used to support the transformer’s weight, ensuring stability during lifting, loading, and unloading operations. Protective corner guards, shock-absorbing pads, and weather-resistant coverings are added to minimize vibration damage and environmental exposure.
For international shipments, the transformer is fixed inside a wooden crate or steel-reinforced container structure, compliant with global maritime and land-transport regulations. All external packaging materials are fumigation-certified for customs clearance. Detailed packing lists, accessory inventories, and installation manuals are placed inside waterproof document pouches for easy verification upon arrival. To prevent oil leakage risks, the transformer is shipped with securely sealed valves and monitored oil levels, and optional nitrogen-filled protection can be applied depending on customer requirements.
Shipping options include ocean freight, land transport, and combined logistics solutions based on project location and timeline. Our logistics team coordinates professional handling with certified carriers to ensure safe transit and delivery accuracy. Upon arrival at the destination, engineers can provide on-site unloading guidance, inspection support, and commissioning assistance to ensure the transformer is installed and put into operation smoothly. Each step of the packing and shipping process is designed to preserve the integrity and performance of the transformer until it reaches the customer’s facility.
For international shipments, the transformer is fixed inside a wooden crate or steel-reinforced container structure, compliant with global maritime and land-transport regulations. All external packaging materials are fumigation-certified for customs clearance. Detailed packing lists, accessory inventories, and installation manuals are placed inside waterproof document pouches for easy verification upon arrival. To prevent oil leakage risks, the transformer is shipped with securely sealed valves and monitored oil levels, and optional nitrogen-filled protection can be applied depending on customer requirements.
Shipping options include ocean freight, land transport, and combined logistics solutions based on project location and timeline. Our logistics team coordinates professional handling with certified carriers to ensure safe transit and delivery accuracy. Upon arrival at the destination, engineers can provide on-site unloading guidance, inspection support, and commissioning assistance to ensure the transformer is installed and put into operation smoothly. Each step of the packing and shipping process is designed to preserve the integrity and performance of the transformer until it reaches the customer’s facility.
32
32 years of industry experience
Manufacturer Test
50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution
Progress test
During the production process of the 50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution, a comprehensive Progress Test is performed to verify quality at every manufacturing stage. Inspections include core lamination accuracy, coil winding tension control, insulation integrity checks, and dimensional verification of mechanical components. Intermediate electrical tests, such as resistance measurement, turns-ratio assessment, and partial discharge evaluation, ensure that the transformer meets performance benchmarks before tank assembly. Oil leakage checks, welding inspections, and pressure resistance tests confirm structural reliability. These progressive evaluations ensure full compliance with IEC, IEEE, and GB standards while guaranteeing stable performance and long-term operational safety.
Design Tests
All transformers will be tested after finishing the production test items as below:
♦ Leak testing with pressure for liquid-immersed transformers
♦ Test of transformer oil
♦ Measurement of voltage ratio and check of phase displacement
♦ Measurement of winding DC resistance
♦ Measurement of d. c. Insulation resistance between each winding to earth, and check of the core and frame insulation
♦ Capacitive bushing test
♦ Measurement of dissipation factor (tan δ) of the insulation system capacitances, and determination of capacitances windings-to-earth
♦ Measurement of no-load loss and current at 90%,100%,110% of rated voltage
♦ Operation test on on-load tap-changer
♦ Measurement of short-circuit impedance and load loss
♦ Lightning impulse test
♦ Induced-voltage test with partial discharge measurement
♦ Auxiliary wiring check
♦ Current transformer test
♦ Frequency response analysis test
Transformer Factory Acceptance Test
The Factory Acceptance Test (FAT) for the 50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer for Distribution is conducted to ensure full compliance with design specifications, performance standards, and customer requirements before shipment. The FAT includes a complete series of routine and type tests performed under controlled factory conditions. Key electrical tests include insulation resistance measurement, applied AC withstand voltage, induced overvoltage withstand test, no-load current and no-load loss assessment, load loss and impedance tests, and short-circuit impedance verification. Additional evaluations include lightning impulse testing, partial discharge measurement, temperature rise test, and transformer oil quality analysis to confirm dielectric strength. Mechanical inspections cover tank pressure integrity, bushing alignment, tap-changer functionality, and protection device calibration. Final inspection verifies all accessories, documentation, nameplate data, and overall workmanship, ensuring the transformer meets international standards such as IEC, IEEE, and GB before delivery.
Routine Test - Applied Voltage
Purpose of Testing
The purpose of testing the applied voltage is to verify the insulation strength of the transformer by applying a voltage higher than its normal operating level, ensuring it can withstand potential electrical stresses. This test helps identify any weaknesses or defects in the insulation system before the transformer is put into service.
Testing Equipment
Test equipment: High voltage tester (e.g. TTR, Hipot, etc.)
Voltage source: usually 1 kV, 5 kV, 10 kV, or customized according to customer needs
Temperature and humidity meter: used to record environmental conditions
Voltage source: usually 1 kV, 5 kV, 10 kV, or customized according to customer needs
Temperature and humidity meter: used to record environmental conditions
Pre-Test Preparation
Disconnect the device from the power supply and make sure it is properly grounded and discharged.
Check the connection terminals and wiring to ensure that they are not loose or contaminated.
Test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C).
Check the connection terminals and wiring to ensure that they are not loose or contaminated.
Test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Properly connect the test equipment to the bushings or terminals of the device under test and ensure that all connection points are properly grounded.
Selecting the test voltage:
Select the appropriate applied voltage based on the rated voltage of the equipment.
Properly connect the test equipment to the bushings or terminals of the device under test and ensure that all connection points are properly grounded.
Selecting the test voltage:
Select the appropriate applied voltage based on the rated voltage of the equipment.
Measure and Record
Start the test and record the following parameters:
Measuring leakage current
Applied voltage
Current stability
Any possible voltage fluctuations
Measuring leakage current
Applied voltage
Current stability
Any possible voltage fluctuations
Temperature Correction
If necessary, the measured data is temperature corrected to ensure that it corresponds to standard temperature conditions (usually 20°C).
Repeat Testing (if necessary)
Multiple tests were conducted on different windings (high voltage, medium voltage, low voltage) and bushings, and comparative analysis was performed.
Evaluation Criteria (Reference)
The test was normal and the equipment performed well (qualified)
The current value exceeded the allowable range and the equipment needs to be inspected or maintained (pending repair)
There was a serious fault or instability and the equipment could not continue to operate (unqualified)
The current value exceeded the allowable range and the equipment needs to be inspected or maintained (pending repair)
There was a serious fault or instability and the equipment could not continue to operate (unqualified)
Observing electrical behavior
Observe the electrical behavior of the device under test to ensure that there are no abnormal currents, arcing, noise, or electrical faults.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
The 50kV 1000kVA Outdoor Three-Phase Oil-Immersed Power Transformer is widely used in utility distribution networks, industrial facilities, mining sites, and renewable energy projects. It provides stable voltage transformation for outdoor installations requiring reliable, weather-resistant, and high-efficiency power distribution performance.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Transformers Packaging (1)
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What is a Transformer?A transformer is an electrical device used to change the voltage of alternating current (AC). It works on the principle of electromagnetic induction, converting high-voltage current into low-voltage current or low-voltage current into high-voltage current. Transformers are widely used in power transmission, distribution systems, and various electronic devices.
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Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
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