2000kVA Oil Immersed Transformer
The 2000kVA Oil Immersed Transformer is a high-capacity, three-phase, liquid-filled distribution transformer engineered for reliable outdoor pad-mounted or substation installations in utility networks, large commercial/industrial complexes, data centers, heavy manufacturing plants, and high-demand power distribution systems. Standard configuration includes mineral oil or FR3 natural ester fluid, ONAN cooling, aluminum or copper windings, high-voltage 34.5kV / 24.94kV / 13.8kV / 12.47kV / 4.16kV (delta or wye), low-voltage 480Y/277V, 208Y/120V, 600Y/347V or custom, ±2×2.5% HV taps, radial or loop-feed dead-front design, bayonet fuses + partial-range current-limiting fuses (optional), load-break switch.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2, 24.94, 26.25, 33 or others
- Secondary Voltage Ratings 480/277V, 400/230V, 380/220V or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Oil immersed distribution transformer
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA, IEC, ISO
- Application Renewable Energy, Residential Areas
- Power Rating 2000kVA
- Certificate UL, CESI, CE
- Cooling Method ONAN, ONAN/ONAF, KNAN, KNAN/KNAF
- Oil Mineral Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
2000kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Rated Power | 2000 kVA | |
| Rating Primary Voltage | 2.4 - 34.5kV | |
| Secondary Voltage | 480/277V 400/230V 380/220V 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 | |
| Insulating Oil Weight | 820 kg | |
| Total Weight | 4750 kg | |
| Outline Dimensions（L×W×H）in. | 2600 × 1650 × 2400（mm) | |
| 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
2000kVA Oil Immersed Transformer
The 2000kVA oil immersed transformer offers extensive customization to precisely meet utility, commercial, and industrial project requirements. Primary voltages range from 2.4kV to 34.5kV (common: 34.5kV, 24.94kV, 13.8kV, 13.2kV, 12.47kV, 4.16kV) in delta or grounded wye configurations with BIL up to 200kV. Secondary voltages include 600Y/347V, 480Y/277V, 208Y/120V, 240/120V, or custom outputs with vector groups Dyn11, Dyn1, Yyn0, etc.
Winding materials are available in high-conductivity copper for maximum efficiency and thermal endurance or aluminum for cost-effective performance. Impedance is adjustable between 5.0–8.5% (±7.5% tolerance) for optimal fault current limiting and system coordination. Cooling is standard ONAN; forced-air (ONAF) options enable 33–50% increased capacity for high-ambient or overload conditions. Insulating fluid choices include conventional non-PCB mineral oil or FR3 natural ester fluid (fire point >300°C, fully biodegradable, extended insulation life).
Protection and switching configurations include radial or loop-feed, dead-front or live-front bushings, load-break elbow-operated switches, bayonet expulsion fuses + partial-range current-limiting fuses, external or internal arresters (normal/heavy duty), and visible break options. Accessories can be tailored with oil temperature/pressure gauges, liquid level indicators, sudden pressure relay, nitrogen blanket system, FR3-compatible gauges, wildlife guards, and digital monitoring (temperature, oil condition, SCADA-ready).
Enclosure options feature ANSI 70 gray, Munsell green, or custom powder-coated finishes with stainless steel hardware for coastal/high-pollution areas, seismic IBC/OSHPD bracing, high-altitude derating, low-sound designs (<60 dB), and K-factor ratings for harmonic-rich loads (data centers, EV charging). Special designs support solar/wind inverter duty, rectifier loads, or dual-voltage primaries. Every customization is fully engineered and validated to exceed IEEE, ANSI, IEC, DOE 2016/2029 efficiency, and client specifications while minimizing total ownership cost.
Packing and Shipping
2000kVA Oil Immersed Transformer
NPC ELECTRIC's 2000kVA oil-immersed transformers are packed and transported with strict safety measures to ensure that they are not damaged during transportation.
First, the transformer body is fixed on a sturdy wooden pallet and cushioned with shockproof rubber pads to avoid shock and vibration during transportation. To prevent moisture and oxidation, the outside of the transformer is covered with a moisture-proof and rust-proof protective film to ensure that the equipment is not affected by the environment during transportation.
All oil valves and bushings are strictly sealed to avoid oil leakage. All accessories of the transformer, such as radiators and oil pillows, are individually packed in special wooden boxes to ensure that they are not affected by external forces during transportation.
The outer packaging of the transformer uses a steel frame or a sturdy wooden box, which can effectively resist external impact. During transportation, the transformer is firmly fixed to the transport vehicle and reinforced with strong straps to avoid any displacement or damage.
All necessary documents, including commercial invoices, packing lists, bills of lading, and test reports, will be prepared together. Any risks during transportation have been fully considered, and corresponding protective measures have been taken. After arriving at the destination, the transformer will be unloaded at the designated location and installed according to the installation instructions.
NPC ELECTRIC guarantees that the transformer will arrive safely and be put into use smoothly, ensuring the safety and stability of customers during use.
Upon delivery, detailed instructions cover safe unloading (via tank lifting lugs), positioning, oil top-off if required, grounding, accessory connections, and pre-energization checks. Comprehensive documentation — commercial invoice, packing list, certificate of origin, certified test reports, material certificates — ensures smooth customs clearance. Third-party pre-shipment inspection or customer witnessing can be arranged. Our logistics team guarantees regulatory compliance, minimal delays, and transformer arrival in perfect condition ready for immediate installation and commissioning.
First, the transformer body is fixed on a sturdy wooden pallet and cushioned with shockproof rubber pads to avoid shock and vibration during transportation. To prevent moisture and oxidation, the outside of the transformer is covered with a moisture-proof and rust-proof protective film to ensure that the equipment is not affected by the environment during transportation.
All oil valves and bushings are strictly sealed to avoid oil leakage. All accessories of the transformer, such as radiators and oil pillows, are individually packed in special wooden boxes to ensure that they are not affected by external forces during transportation.
The outer packaging of the transformer uses a steel frame or a sturdy wooden box, which can effectively resist external impact. During transportation, the transformer is firmly fixed to the transport vehicle and reinforced with strong straps to avoid any displacement or damage.
All necessary documents, including commercial invoices, packing lists, bills of lading, and test reports, will be prepared together. Any risks during transportation have been fully considered, and corresponding protective measures have been taken. After arriving at the destination, the transformer will be unloaded at the designated location and installed according to the installation instructions.
NPC ELECTRIC guarantees that the transformer will arrive safely and be put into use smoothly, ensuring the safety and stability of customers during use.
Upon delivery, detailed instructions cover safe unloading (via tank lifting lugs), positioning, oil top-off if required, grounding, accessory connections, and pre-energization checks. Comprehensive documentation — commercial invoice, packing list, certificate of origin, certified test reports, material certificates — ensures smooth customs clearance. Third-party pre-shipment inspection or customer witnessing can be arranged. Our logistics team guarantees regulatory compliance, minimal delays, and transformer arrival in perfect condition ready for immediate installation and commissioning.
32
32 years of industry experience
Manufacturer Test
2000kVA Oil Immersed Transformer
Progress Test
During the manufacturing process of NPC ELECTRIC's 2000kVA oil-immersed transformers, multiple progress tests are carried out in strict accordance with international standards. First, after the initial manufacturing, electrical performance tests are carried out to ensure that the output voltage, current, and frequency of the transformer meet the design requirements. Next, temperature rise tests are carried out to verify the thermal stability and heat dissipation effect of the transformer under long-term operation. Subsequently, short-circuit tests are carried out to detect the transformer's tolerance and safety under short-circuit conditions. During the test, the insulation strength is also strictly tested to ensure the safety of the equipment in a high-voltage environment. Finally, all test data and reports are recorded in detail, and a complete test report is provided to the customer to ensure that the quality and performance of the transformer meet the use requirements. Through this series of tests, NPC ELECTRIC ensures that each 2000kVA oil-immersed transformer can be put into use stably and reliably.
Design Tests
All transformers will be tested after finishing the production, test items as follows:
♦ 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)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Transformer Factory Acceptance Test
NPC ELECTRIC's 2000kVA oil-immersed transformers will undergo a rigorous Factory Acceptance Test (FAT) before leaving the factory. The test will include a comprehensive inspection of the transformer's various performances, including but not limited to no-load loss, load loss, winding DC resistance, and insulation resistance tests. In addition, the transformer's short-circuit impedance, oil dielectric strength, and its cooling system will be tested to ensure the reliability and safety of the equipment. All tests are carried out in accordance with international standards and customer requirements to ensure that the transformer can operate stably and long-term under extreme conditions. After the factory acceptance test, the transformer will be certified and ready for shipment.We are committed to providing customers with high-quality and reliable transformer products to ensure that they achieve optimal performance in actual applications.
Routine Test - Temperature Rise
Purpose of Testing
The purpose of the temperature rise test is to detect the temperature change of the equipment under working conditions by applying the rated load current or higher load current to ensure that the insulation performance of the equipment will not be degraded or damaged due to overheating during operation.
Testing Equipment
Temperature rise tester (e.g. OMRON, FLIR, Extech, etc.)
Heating source (e.g. electric heater, heater belt, or adjustable constant temperature heater, the specific power is selected according to the equipment requirements)
Temperature sensor (e.g. RTD sensor, thermocouple, to ensure accurate measurement)
Heating source (e.g. electric heater, heater belt, or adjustable constant temperature heater, the specific power is selected according to the equipment requirements)
Temperature sensor (e.g. RTD sensor, thermocouple, to ensure accurate measurement)
Pre-Test Preparation
Disconnect the device from the power supply and ensure that the device is properly grounded and discharged.
Ensure that the connection terminals and wiring are firm to avoid looseness affecting the test results.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Ensure that the connection terminals and wiring are firm to avoid looseness affecting the test results.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test instrument correctly to the electrical terminals and temperature measurement points of the device under test (such as windings, cores, oil temperature measurement elements, etc.).
Initial condition record:
Measure and record ambient temperature, humidity, and atmospheric pressure at the start of the test.
Make sure the device is cold at the start.
Connect the test instrument correctly to the electrical terminals and temperature measurement points of the device under test (such as windings, cores, oil temperature measurement elements, etc.).
Initial condition record:
Measure and record ambient temperature, humidity, and atmospheric pressure at the start of the test.
Make sure the device is cold at the start.
Measure and Record
Record the following parameters regularly:
Temperature of each winding (by resistance method or temperature sensor)
Core temperature
Oil temperature (for oil-immersed equipment)
Current, voltage and power at the equipment end
Duration of load
Record changes in ambient temperature.
Temperature of each winding (by resistance method or temperature sensor)
Core temperature
Oil temperature (for oil-immersed equipment)
Current, voltage and power at the equipment end
Duration of load
Record changes in ambient temperature.
Temperature Correction
Correct the measured winding temperature rise (equipment temperature - ambient temperature) to the reference ambient temperature (usually 20°C or as required by the standard).
Repeat Testing (if necessary)
Correct the measured winding temperature rise (equipment temperature - ambient temperature) to the reference ambient temperature (usually 20°C or as required by the standard).
Evaluation Criteria (Reference)
The maximum temperature rise of the winding should not exceed the product standard or the manufacturer's specified value (for example: Class A insulation: ≤60°C temperature rise
Class B insulation: ≤80°C temperature rise
Class F insulation: ≤100°C temperature rise)
Class B insulation: ≤80°C temperature rise
Class F insulation: ≤100°C temperature rise)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Ideal for large commercial buildings, office towers, retail malls, hospitals, schools, and medium-to-heavy manufacturing facilities requiring reliable step-down from medium-voltage utility feed to 480V or 208V. Also suits suburban/urban distribution networks with underground or overhead feeds, delivering safe, low-maintenance power in high-traffic or high-load locations.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Transformers Packaging (1)
Transformers Packaging (2)
Transformers Packaging (3)
Transformers Packaging (4)
Transformers Packaging (5)
Transformers Packaging (6)
Transformers Packaging (7)
Transformers Packaging (8)
Related Products
25kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
The 25kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer is a compact, oil-immersed overhead distribution transformer with integrated self-protection for enhanced safety and reduced external equipment needs in residential, rural, small commercial, and light agricultural power supply. Compliant with ANSI C57.12.20, IEEE C57.12.00 / C57.12.90, DOE efficiency standards (meeting or exceeding DOE 2016 levels, aligned with 2029 amended requirements for reduced losses in single-phase units), and applicable CSA/IEC guidelines, this CSP unit delivers efficient step-down from medium-voltage primary lines to low-voltage secondary service, with built-in protection against overloads, faults, and surges, low no-load/load losses, and long service life in pole-mounted utility applications.
75kVA Conventional Type Single Phase Pole Mounted Transformer
NPC ELECTRIC has been specialized in manufacturing 75kVA Conventional Type Single Phase pole Mounted transformer for more than 20 years, which complies with international standards such as ANSI/IEEE C57, IEC60076 and other standards. Its main function is to convert high voltage electricity (such as 11kV, 13.8kV, etc.) into low voltage electricity (such as 120V/240V), providing stable and reliable power supply to end users. It is suitable for residential, commercial, agricultural and small industrial loads. Typical specifications include mineral oil insulation (ONAN cooling), aluminum or copper windings, primary voltages 2.4kV–34.5kV grounded wye or delta (common: 7200/12470GrdY, 7620/13200GrdY, 12470GrdY/7200, 24940GrdY/14400, 34500GrdY/19920), secondary 120/240V or 240/120V split-phase, BIL ratings 95–150kV HV / 30kV LV, impedance typically 2.0–4.0%, ±2×2.5% or 5-position tap changer, conventional or CSP (completely self-protected) configurations with internal fuses, lightning arresters, weak-link protection, pressure relief valve, oil sight gauge, and ANSI 70 gray tank finish. Efficiency typically reaches 99.17–99.19% at 50% load per DOE levels, with low sound levels and corrosion-resistant hardware for extended outdoor service.
225kVA Three Phase Pad Mounted Transformer
The 225kVA three-phase pad transformer is an efficient and reliable power conversion device designed for commercial, industrial and distribution systems. With a high power capacity of 225kVA, the transformer is able to provide a stable three-phase power supply for large-scale equipment to meet high load requirements. Its rugged housing is made of weather-resistant materials and meets NEMA 3R standards, ensuring long-term stable operation in outdoor environments and preventing the influence of external factors such as water, dust and corrosion.
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.
115kV 35MVA Three-Phase Oil-Immersed Power Transformer
The 115kV 35MVA Three-Phase Oil-Immersed Power Transformer is designed for reliable and efficient operation in high-voltage transmission and substation applications. Built with high-permeability silicon steel cores and precision-wound copper conductors, it delivers low losses, strong short-circuit withstand capability, and excellent thermal stability. The oil-immersed cooling system ensures effective heat dissipation, enabling continuous operation under heavy-load conditions. A robust tank structure, advanced insulation system, and outdoor-rated protection make the transformer suitable for harsh environmental conditions. Manufactured in accordance with IEC, IEEE, and ANSI standards, this transformer is widely used in utility substations, industrial power systems, and regional transmission networks where long service life, stable voltage regulation, and high operational reliability are critical.
400kVA Oil Immersed Transformer
The 400kVA Oil Immersed Transformer produced by our company adopts a new insulation structure to improve the short-circuit resistance; the iron core is made of high-quality cold-rolled silicon steel sheet; the high-voltage winding is made of high-quality oxygen-free copper wire and adopts a multi-layer cylindrical structure; all fasteners are treated with special anti-loosening treatment. ONAN cooling, aluminum or copper windings, high-voltage 34.5kV / 24.94kV / 13.8kV / 12.47kV / 4.16kV (delta or wye), low-voltage 480Y/277V, 208Y/120V, 600Y/347V or custom, ±2×2.5% HV taps.FAQ From Customers
-
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.
-
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.
-
Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
Welcome your inquiry
Honesty, Integrity, Frugality, Activeness and Passion