750kVA Oil Immersed Transformer
NPC ELECTRIC's 750kVA oil-immersed transformer uses advanced oil-immersed cooling technology to provide efficient and stable power conversion. The transformer complies with international standards such as the International Electrotechnical Commission (IEC) and ISO 9001, ensuring the high quality and safety of the product. Its sturdy structure and excellent overload resistance are widely used in industrial, commercial, and power network fields.
- 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, UL
- Application Industrial, Commercial and Power Network Fields
- Power Rating 750kVA
- 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
750kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 750 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 | 650 kg | |
| Total Weight | 3300 kg | |
| Outline Dimensions（L×W×H）in. | 2400 × 1200 × 2450（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
750kVA Oil Immersed Transformer
NPC ELECTRIC 750kVA oil-immersed transformers can provide different voltage levels according to customer needs, such as 11kV, 6kV, and 3.6kV on the high-voltage side. A variety of cooling methods are available, including natural cooling (ONAN) or forced oil circulation cooling (OFAF). Equipped with high-quality insulating oil to ensure long-term stable operation of the transformer and reduce the failure rate. Supports IP54 protection level, suitable for use in harsh environments. In addition, moisture-proof and corrosion-resistant casings can be installed as required to adapt to high humidity or corrosive environments.
Provide an intelligent monitoring system, support remote data acquisition and real-time monitoring, and improve maintenance efficiency. The transformer can also provide customized services such as noise control, seismic design, special coatings, etc., according to the specific application needs of users to meet the use requirements in special environments. These optional specifications can ensure that NPC ELECTRIC 750kVA oil-immersed transformers can operate stably and efficiently in various complex power systems and provide customers with more flexible usage solutions.
Packing and Shipping
750kVA Oil Immersed Transformer
To ensure that NPC ELECTRIC's 750kVA oil-immersed transformer is safe and stable during transportation, a professional packaging solution is used.
The transformer body is fixed on a high-strength wooden pallet to ensure stability during transportation. Anti-vibration rubber pads are used to reduce vibration and impact that may occur during transportation. The outside of the equipment is covered with a moisture-proof and rust-proof protective film to prevent moisture or corrosion.
Sturdy wooden boxes or steel frames are used for packaging to ensure that the transformer is not damaged during long-distance transportation. Warning signs such as "hoisting position", "upward placement", and "moisture-proof and shock-proof" are clearly marked on the outside of the package. Silicone desiccant is installed in key locations to prevent moisture from entering the equipment.
When lifting the transformer, special lifting ears, lifting rings, or slings are used to ensure safe handling. During transportation, high-strength straps are used to fix it, and anti-slip mats and support blocks are placed in the carriage to prevent the equipment from moving. Standard export documents such as packing list, commercial invoice, bill of lading, product inspection report, and certificate of conformity are provided.
This packaging and transportation solution ensures that the NPC ELECTRIC 750kVA oil-immersed transformer is safe and reliable during the logistics process, and ensures that the equipment can be put into normal use after arriving at the destination.
The transformer body is fixed on a high-strength wooden pallet to ensure stability during transportation. Anti-vibration rubber pads are used to reduce vibration and impact that may occur during transportation. The outside of the equipment is covered with a moisture-proof and rust-proof protective film to prevent moisture or corrosion.
Sturdy wooden boxes or steel frames are used for packaging to ensure that the transformer is not damaged during long-distance transportation. Warning signs such as "hoisting position", "upward placement", and "moisture-proof and shock-proof" are clearly marked on the outside of the package. Silicone desiccant is installed in key locations to prevent moisture from entering the equipment.
When lifting the transformer, special lifting ears, lifting rings, or slings are used to ensure safe handling. During transportation, high-strength straps are used to fix it, and anti-slip mats and support blocks are placed in the carriage to prevent the equipment from moving. Standard export documents such as packing list, commercial invoice, bill of lading, product inspection report, and certificate of conformity are provided.
This packaging and transportation solution ensures that the NPC ELECTRIC 750kVA oil-immersed transformer is safe and reliable during the logistics process, and ensures that the equipment can be put into normal use after arriving at the destination.
32
32 years of industry experience
Manufacturer Test
750kVA Oil Immersed Transformer
Progress Test
During the transformer production process, NPC ELECTRIC will conduct preliminary insulation tests to ensure that the electrical performance of each component meets the design requirements. Then, a load test is carried out to verify the efficiency and stability of the transformer under normal load. A partial discharge test is carried out to ensure that the insulation system of the transformer is not damaged and can maintain good insulation performance during long-term operation. After completion, a temperature rise test is carried out to simulate the thermal state of the transformer during operation to ensure that it can operate safely in a high-temperature environment. Finally, a comprehensive quality inspection report is provided, including all test data, to ensure that the transformer meets international standards and is ready for delivery.
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 the 750kVA oil-immersed transformers manufactured by NPC ELECTRIC leave the factory, we conduct a rigorous factory acceptance test (FAT) to ensure that the transformers meet international standards and customer requirements and can operate efficiently and safely in actual use.
The appearance of the transformer is fully inspected to ensure that there is no obvious transportation damage, oil leakage, stains, or manufacturing defects. The appearance of the transformer is fully inspected to ensure that there is no obvious transportation damage, oil leakage, stains, or manufacturing defects.
During the load test, the temperature rise, noise, vibration, and other data of the transformer will be recorded to ensure that the transformer will not overheat or have abnormal phenomena. A short-circuit impedance test is carried out to check the performance of the transformer under short-circuit conditions.
After completing all tests, the technicians will write a detailed test report, including the results, data records, test standards, and compliance of all test items, etc., which will be provided to customers and relevant quality control departments for reference.
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
Industrial, Commercial and Power Network Fields
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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