45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer
The 45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer is engineered for demanding outdoor applications requiring high durability, stable voltage transformation, and long-term operational reliability. Designed with premium cold-rolled silicon steel, high-conductivity copper windings, and a reinforced oil-immersed cooling system, the transformer ensures excellent thermal stability and resistance to overheating. Its oven-proof construction allows the unit to withstand high ambient temperatures, while the weatherproof enclosure provides protection against rain, dust, humidity, and corrosive environments. With advanced insulation, strong short-circuit endurance, and compatibility with both off-load and on-load tap changers, this 45kV outdoor transformer is ideal for substations, industrial facilities, renewable energy sites, and long-distance power distribution systems. Built in accordance with IEC 60076 standards, it delivers efficiency, reliability, and lifespan required for critical grid infrastructure.
- Primary Voltage Ratings 35kV, 34.5kV, 33kV, 46kV or others
- Secondary Voltage Ratings 13.8kV 6kV 10kV or others
- H.V. Tap Range ±8×1.25% or others
- Type Oil-immersed power transformer
- BIL 45kV
- Standards IEEE, ANSI, NEMA, IEC, CE
- Application utility substations, heavy industrial plants, petrochemical facilities, mining operations
- Power Rating 2500kVA
- Certificate UL, CESI, IEEE
- Cooling Method ONAN/ONAF
- Oil Mineral Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer
Technical Specifications
Accessories
| Rated Power | 2500kVA | |
| Rating Primary Voltage | 45 kV | |
| Secondary Voltage |
6.6kV 10kV 13.8kV Customized |
|
| Frequency | 50/60Hz | |
| Vector Group | Dyn11, Yyn0, Dyn5 | |
| Winding Material | Aluminum/Copper | |
| Efficiency | As IEEE, Doe 2016, CAS Std or Customized | |
| Impedance Voltage | Nominal 2% or Customized 1.1 - 5.75% | |
| Altitude | ≤1,000m or Customized | |
| Color | ANSI 70 Light gray/Munsell 7GY3.29/1.5 or customized, etc | |
| Tank material | Mild Steel, 304 Stainless Steel | |
| HV Bushing |
| LV Bushing |
| Tap changer |
| Oil level gauge |
| Oil temperature indicator |
| Pressure relief device |
| Pressure vacuum gauge |
| Lifting hook for complete transformer |
| Name plate |
| Radiators |
| Oil upper filtering valve |
| Oil drain valve with 3/8" sampler |
Customization Optional
45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer
The 45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer offers extensive customization options to meet specific utility, industrial, and environmental requirements. Customers may configure voltage ratios, impedance values, vector groups, cooling types, and tap changer settings. Both on-load tap changers (OLTC) and off-load tap changers (OCTC) are available to achieve precise voltage control under varying load conditions. Enhanced insulation levels, low-loss magnetic cores, and upgraded copper windings can be specified to improve efficiency and reduce operational losses.
Environmental and structural customizations include oven-proof high-temperature designs, anti-corrosion coatings, desert-proof or coastal-proof surface treatments, and weatherproof enclosures engineered for harsh climates. For high-altitude installations, specialized insulation and cooling configurations ensure optimal performance. Users may also choose sealed-tank or conservator-type designs with customizable radiator configurations, including corrugated walls, tubular radiators, or detachable radiators.
Advanced monitoring systems can be integrated to support intelligent asset management, such as oil-level indicators, online gas monitoring (DGA), winding temperature sensors, bushing monitoring, digital relays, and SCADA-compatible communication modules. Additional safety features—including pressure relief valves, Buchholz relays, surge arresters, and over-temperature alarms—can be tailored to project specifications.
Whether deployed in industrial plants, substations, renewable energy farms, or critical infrastructure, the customization flexibility ensures that each 45kV 2500kVA transformer achieves maximum performance, durability, and operational reliability.
Packing and Shipping
45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer
The 45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer is packaged and shipped following rigorous international logistics and safety standards to ensure full protection during transportation. Prior to packing, the transformer undergoes final inspection, dehydration, vacuum oil treatment, and surface cleaning. All bushings, valves, and external connections are sealed with protective covers to prevent dust and moisture ingress. Detachable components such as radiators, conservators, tap changers, and monitoring devices are individually wrapped with anti-shock foam, moisture-proof film, and placed in strong wooden crates.
The main transformer tank is secured to a reinforced steel or wooden base designed for heavy-load transportation. High-strength bolts, steel straps, anti-slip blocks, and vibration-damping pads are used to stabilize the unit. Structural supports and corner protection safeguard the transformer against impact during handling. A complete set of technical documents, including test certificates, operation manuals, wiring diagrams, and packing lists, is placed inside a sealed waterproof folder attached to the transformer body.
Depending on project requirements and destination, multiple transport modes can be arranged. For export shipments, the transformer can be loaded onto flat rack containers, open-top containers, or breakbulk vessels. For land transportation, heavy-duty trailers with secure tie-down points ensure safe delivery to remote sites. All lifting points are clearly marked, and lifting lugs or forklift channels are engineered for safe handling using cranes or forklifts.
Environmental conditions, including sea humidity, road vibration, and long-distance handling, are fully considered. Rust-prevention coatings and oil-filled protection ensure that internal components remain secure throughout transit. The entire packing and shipping process complies with ISO, IEC, and international maritime regulations, guaranteeing that the 45kV 2500kVA transformer arrives in perfect condition, ready for installation and commissioning.
The main transformer tank is secured to a reinforced steel or wooden base designed for heavy-load transportation. High-strength bolts, steel straps, anti-slip blocks, and vibration-damping pads are used to stabilize the unit. Structural supports and corner protection safeguard the transformer against impact during handling. A complete set of technical documents, including test certificates, operation manuals, wiring diagrams, and packing lists, is placed inside a sealed waterproof folder attached to the transformer body.
Depending on project requirements and destination, multiple transport modes can be arranged. For export shipments, the transformer can be loaded onto flat rack containers, open-top containers, or breakbulk vessels. For land transportation, heavy-duty trailers with secure tie-down points ensure safe delivery to remote sites. All lifting points are clearly marked, and lifting lugs or forklift channels are engineered for safe handling using cranes or forklifts.
Environmental conditions, including sea humidity, road vibration, and long-distance handling, are fully considered. Rust-prevention coatings and oil-filled protection ensure that internal components remain secure throughout transit. The entire packing and shipping process complies with ISO, IEC, and international maritime regulations, guaranteeing that the 45kV 2500kVA transformer arrives in perfect condition, ready for installation and commissioning.
32
32 years of industry experience
Manufacturer Test
45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer
Progress Test
During production, the 45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer undergoes multi-stage Progress Tests to ensure manufacturing accuracy and component reliability. Each step includes core lamination inspections, coil winding tension control, insulation layer measurement, and mechanical assembly verification. Electrical tests such as DC resistance measurement, turns ratio validation, insulation resistance, partial discharge testing, and intermediate withstand voltage tests are performed to detect early faults. Oil purification and vacuum drying tests verify dielectric strength and moisture removal. Dimensional checks, fastening inspections, and surface treatment assessments further guarantee build quality. These progressive inspections ensure that every component meets engineering and safety standards before final assembly and FAT testing.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ Winding Resistance
♦ Impulse Tests
♦ On load Loss Test
♦ No Load Loss Test
♦ Leak Test
♦ DC Insulation Resistance Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Impedance Voltage & Load Loss (Rated Voltage)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Transformer Factory Acceptance Test
Before shipment, the 45kV 2500kVA Weatherproof & Oven-Proof Oil-Immersed Power Transformer undergoes a comprehensive Factory Acceptance Test (FAT) in accordance with IEC 60076. The FAT includes winding resistance measurement, ratio, and vector group verification, no-load loss and load loss measurement, insulation resistance testing, induced overvoltage test, applied high-voltage withstand test, and partial discharge assessment. Mechanical tests verify tank strength, pressure performance, cooling efficiency, and accessory functionality. Additional checks include dielectric oil quality analysis, tap changer operation, protection device calibration, and enclosure integrity confirmation. The FAT ensures the transformer meets all performance, safety, and environmental requirements before leaving the factory.
Routine Test - Polarity 1-Ph
Purpose of Testing
The purpose of testing the polarity of a single-phase transformer is to ensure that the primary and secondary windings are correctly oriented, preventing issues like improper phase connection. It also verifies that the transformer operates safely and efficiently in the intended electrical system.
Testing Equipment
Test equipment: Polarity Tester (e.g. Megger, Hioki, etc.)
Voltage source: usually 500 V, 1000 V or customized as needed
Environmental monitoring: Temperature and humidity meter (records ambient temperature and humidity)
Voltage source: usually 500 V, 1000 V or customized as needed
Environmental monitoring: Temperature and humidity meter (records ambient temperature and humidity)
Pre-Test Preparation
Disconnect the device from the power supply and ensure that it is properly grounded and discharged.
Check the connection terminals and wiring to ensure that there is no looseness or contamination.
Test under suitable environmental conditions: relative humidity less than 75% and no rain (recommended temperature: 20-30°C).
Check the connection terminals and wiring to ensure that there is no looseness or contamination.
Test under suitable environmental conditions: relative humidity less than 75% and no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test equipment to the bushing or terminal of the device under test and ensure proper grounding.
Apply Test Voltage:
Select the appropriate test voltage according to the rated voltage of the device. For single-phase systems, the applied voltage should comply with the equipment specifications (such as 220V or 380V, etc.).
Connect the test equipment to the bushing or terminal of the device under test and ensure proper grounding.
Apply Test Voltage:
Select the appropriate test voltage according to the rated voltage of the device. For single-phase systems, the applied voltage should comply with the equipment specifications (such as 220V or 380V, etc.).
Measure and Record
Start the test and record the following parameters:
Phase sequence: Confirm whether the phase sequence of the power supply is correct.
Polarity: Check whether the wiring meets the predetermined polarity (positive and negative terminals are connected correctly).
Voltage: The actual voltage value during the test.
Phase sequence: Confirm whether the phase sequence of the power supply is correct.
Polarity: Check whether the wiring meets the predetermined polarity (positive and negative terminals are connected correctly).
Voltage: The actual voltage value during the test.
Temperature Correction
Measure different wiring points (such as input and output) for comparative analysis to ensure that the electrical polarity is consistent.
Repeat Testing (if necessary)
If necessary, correct the measured parameters to the reference temperature (usually 20°C) to ensure the accuracy of the test results.
Evaluation Criteria (Reference)
Correct polarity: The wiring meets the expected polarity requirements and meets the standard. Reverse polarity: If reverse polarity occurs, it should be corrected immediately and retested. Polarity uncertainty: If there is any uncertainty, further check the power supply and wiring configuration.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Its oven-proof and weatherproof design ensures stable operation under extreme temperatures, moisture, dust, and corrosive conditions. This transformer is also suitable for renewable energy systems, including wind and solar power integration, where long-term durability and efficient voltage transformation are essential.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
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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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What are the main uses of a transformer?The main use of a transformer is voltage conversion. Transformers are used in power transmission systems to help transfer electricity from power plants to consumers. In addition, transformers are also used in electronic devices such as chargers, televisions, power adapters, etc., to adjust the voltage to meet the requirements of different 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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