1600kVA Oil Immersed Transformer
The 1600kVA 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, manufacturing plants, and high-demand power distribution systems. 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.
- 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 Power Distribution, Commercial Buildings
- Power Rating 1600kVA
- 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
1600kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Rated Power | 1600 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 | 800 kg | |
| Total Weight | 4500 kg | |
| Outline Dimensions（L×W×H）in. | 2600 × 1600 × 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
1600kVA Oil Immersed Transformer
NPC Electric 1600kVA Oil Immersed Transformer offers extensive electrical customization options to accommodate different grid standards and project specifications. Primary and secondary voltage ratings can be configured according to regional transmission and distribution requirements, ensuring seamless integration into existing power networks. Off-load or on-load tap changers are available to maintain voltage stability under load fluctuations and grid variations. Insulation class, temperature rise limits, and cooling configurations can also be customized to suit specific operational and environmental conditions.
Structural and functional customization further enhances adaptability to diverse installation scenarios. The transformer tank can be designed with various structural profiles and protective coatings to withstand harsh climates, high humidity, or industrial pollution. Optional accessories such as oil level indicators, winding and oil temperature sensors, pressure relief devices, and online monitoring interfaces can be integrated based on project needs. These customization options ensure the 1600kVA oil immersed transformer meets technical, environmental, and operational requirements while maintaining efficiency, safety, and long-term reliability.
Packing and Shipping
1600kVA Oil Immersed Transformer
Before packing, each 1600kVA Oil Immersed Transformer undergoes a comprehensive inspection to verify assembly quality, oil condition, and accessory completeness. The transformer is thoroughly cleaned, dried, and sealed to prevent moisture ingress and contamination during transportation. All bushings, terminals, and external fittings are carefully secured to reduce the risk of damage during handling.
For packing, the transformer is mounted on a reinforced wooden or steel base designed to support its weight and prevent displacement during transit. Protective materials, including moisture-resistant wrapping and shock-absorbing layers, are applied to safeguard the tank surface, radiators, and bushings from vibration and environmental exposure. Packing methods comply with international transportation standards, making the 1600kVA oil immersed transformer suitable for long-distance road transport, sea freight, or multimodal logistics.
Shipping arrangements are planned according to customer delivery terms and project schedules. The manufacturer works closely with experienced logistics providers to ensure safe loading, optimized routing, and timely delivery. Complete shipping documentation, including packing lists, inspection reports, and compliance certificates, is prepared to facilitate smooth customs clearance.
Upon arrival at the destination, unloading and handling instructions are provided to support safe installation preparation. Professional packing and shipping management help preserve the electrical and mechanical integrity of the 1600kVA oil immersed transformer from factory dispatch to final commissioning.
Export packaging uses ISPM-15 certified heat-treated wooden crating reinforced with steel strapping and corner protectors, clearly marked with weight, center of gravity, lifting points, dimensions (approx. 3.6–4.2m L × 3.3–3.7m W × 3.4–4.0m H), and handling instructions (“Fragile – High Voltage Equipment”). Tamper-evident seals secure all access doors; weatherproof covers protect HV/LV compartments and bushings.
For packing, the transformer is mounted on a reinforced wooden or steel base designed to support its weight and prevent displacement during transit. Protective materials, including moisture-resistant wrapping and shock-absorbing layers, are applied to safeguard the tank surface, radiators, and bushings from vibration and environmental exposure. Packing methods comply with international transportation standards, making the 1600kVA oil immersed transformer suitable for long-distance road transport, sea freight, or multimodal logistics.
Shipping arrangements are planned according to customer delivery terms and project schedules. The manufacturer works closely with experienced logistics providers to ensure safe loading, optimized routing, and timely delivery. Complete shipping documentation, including packing lists, inspection reports, and compliance certificates, is prepared to facilitate smooth customs clearance.
Upon arrival at the destination, unloading and handling instructions are provided to support safe installation preparation. Professional packing and shipping management help preserve the electrical and mechanical integrity of the 1600kVA oil immersed transformer from factory dispatch to final commissioning.
Export packaging uses ISPM-15 certified heat-treated wooden crating reinforced with steel strapping and corner protectors, clearly marked with weight, center of gravity, lifting points, dimensions (approx. 3.6–4.2m L × 3.3–3.7m W × 3.4–4.0m H), and handling instructions (“Fragile – High Voltage Equipment”). Tamper-evident seals secure all access doors; weatherproof covers protect HV/LV compartments and bushings.
32
32 years of industry experience
Manufacturer Test
1600kVA Oil Immersed Transformer
Progress Test
During the manufacturing process of NPC ELECTRIC's 1600kVA oil-immersed transformers, strict raw material inspections are first carried out to ensure that all components meet high standards. Next, the various components of the transformer will be assembled on a professional production line and undergo preliminary mechanical strength tests. The transformer then enters the oil immersion process to ensure that the quality and sealing of the oil meet international standards. Subsequent high-voltage and load tests will verify the stability and reliability of the transformer in actual working conditions. Finally, after comprehensive inspection and testing, the transformer will be accompanied by a detailed test report and certificate of conformity to ensure that the performance is fully in line with expectations when it is delivered to the customer.
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 1600kVA oil-immersed transformers are manufactured and tested in strict accordance with international standards. First, the core and coil parts of the transformer are manufactured on high-precision equipment to ensure stable and reliable electrical performance. Subsequently, all components are preliminarily assembled and strictly quality checked to ensure that each part meets the design requirements. All test data are recorded in detail and compared with the design parameters to ensure that the product meets the performance standards. Finally, after the final appearance and function inspection, the transformer will be packaged and prepared for shipment. Through this series of rigorous testing and verification, NPC ELECTRIC ensures that each 1600kVA oil-immersed transformer can operate stably at the customer's site and meet high standards of use.
Routine Test - Winding Resistance
Purpose of Testing
The purpose of winding resistance testing is to detect the continuity and connection quality of the internal conductors of the motor or transformer windings, and to promptly detect potential faults such as open circuits, poor contact or local heating.
Testing Equipment
Winding resistance tester (e.g. OMICRON, DV Power, Raytech, Megger, ISA, etc.)
Test voltage source (commonly used are 6V, 10V, 20V, 40V or 100V, depending on the equipment model or customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test)
Test voltage source (commonly used are 6V, 10V, 20V, 40V or 100V, depending on the equipment model or customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test)
Pre-Test Preparation
Check if the instrument has been calibrated to ensure the test accuracy.
Disconnect the electrical connection between the test cable and the equipment to ensure that there is no external current or voltage interference.
Select a suitable voltage range for testing and set the test voltage according to the equipment requirements.
Disconnect the electrical connection between the test cable and the equipment to ensure that there is no external current or voltage interference.
Select a suitable voltage range for testing and set the test voltage according to the equipment requirements.
Test Progress
Connect the Test Instrument:
Connect the test equipment to the winding terminals of the device under test, making sure the connections are secure and properly grounded to avoid measurement errors.
Apply Test Voltage:
Select the appropriate test current according to the equipment specifications (such as test current for low-voltage windings, single-phase or three-phase windings).
Connect the test equipment to the winding terminals of the device under test, making sure the connections are secure and properly grounded to avoid measurement errors.
Apply Test Voltage:
Select the appropriate test current according to the equipment specifications (such as test current for low-voltage windings, single-phase or three-phase windings).
Measure and Record
Start the test and record the following parameters:
Winding resistance (usually expressed in units of "Ω")
Test current (A)
Test voltage (V)
Temperature (record the winding temperature before and after the test)
Winding resistance (usually expressed in units of "Ω")
Test current (A)
Test voltage (V)
Temperature (record the winding temperature before and after the test)
Temperature Correction
The measured winding resistance values are converted to a reference temperature (usually 20°C) based on a temperature correction formula to allow accurate evaluation and comparison.
Repeat Testing (if necessary)
Test the different windings (high voltage, medium voltage, low voltage) separately and make sure to record the resistance value of each winding.
Evaluation Criteria (Reference)
Resistance deviation is less than 5% (normal)
Resistance deviation is between 5% and 10% (warning)
Resistance deviation exceeds 10% (further inspection or corrective action is required)
Resistance deviation is between 5% and 10% (warning)
Resistance deviation exceeds 10% (further inspection or corrective action is required)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Suitable for large industrial parks, manufacturing plants, commercial complexes and urban substations, providing stable and efficient power conversion for medium and high load power distribution systems.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
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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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