630kVA Oil Immersed Transformer
NPC ELECTRIC’S 630kVA oil-immersed transformer adopts a high-efficiency and energy-saving design, complies with the IEC 60076 international standard, and ensures stable operation and long life. Its high-quality silicon steel core and high-performance insulating oil provide excellent electrical performance and heat dissipation capabilities. It is widely used in power systems, industrial parks, and commercial facilities to meet different load requirements.
- 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, GB
- Application Power Distribution Networks, Industrial Applications, Infrastructure & Public Utilities
- Power Rating 630kVA
- 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
630kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 630 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 | 625 kg | |
| Total Weight | 3000 kg | |
| Outline Dimensions（L×W×H）in. | 2250 × 1350 × 2250（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
630kVA Oil Immersed Transformer
In addition to the standard configuration, the 630kVA oil-immersed transformer provided by NPC ELECTRIC can also be customized according to customer needs with the following optional specifications to meet the requirements of different applications. The high-voltage side voltage can provide a variety of rated voltage options according to customer needs, including 6kV, 10kV, and 11kV, and can be customized with higher or lower voltages. The standard configuration of the low-voltage side voltage is 400V/230V, but other voltage levels such as 380V and 415V can also be provided according to user needs. The winding material provides copper winding options and aluminum winding options. The standard configuration of the oil-immersed liquid type is mineral oil.
According to customer requirements, environmentally friendly vegetable oil can also be provided as the oil-immersed liquid, which has better environmental protection and higher fire safety performance, and is suitable for occasions with strict environmental protection requirements. NPC ELECTRIC's 630kVA oil-immersed transformer has a wide range of optional specifications, and can customize various configurations and functions according to customer needs to ensure excellent performance and safety in different working environments. Whether it is voltage range, winding material, oil type or additional protection function, you can flexibly choose according to actual needs.
Packing and Shipping
630kVA Oil Immersed Transformer
The transformer body is firmly mounted on a reinforced wooden pallet to prevent shaking and collision during transportation. Rubber shock-absorbing pads are used to cushion the contact points to reduce the damage to the equipment caused by vibration during transportation. The surface of the transformer is covered with a moisture-proof and rust-proof protective film to ensure that it is not affected by moisture during long-term transportation or storage, and to avoid oxidation corrosion.
For cross-border transportation, the transformer will be transported by container shipping or special cargo ships (for super-large transformers). For goods that require a longer transportation time, bulk transportation is used. The loading and unloading of the transformer are operated by a professional lifting team, using equipment such as hooks and slings to lift it from a fixed point to ensure that no damage is caused to the equipment during operation.
All documents required for export, such as packing lists, commercial invoices, bills of lading, test reports, certificates of origin, etc., will be prepared in advance and provided with the goods.
The outside of the package is marked with clear unloading instructions, such as "fragile", "handle with care", "keep upright" and other warnings to ensure safety during transportation and unloading. Detailed installation instructions and operating manuals are provided to help customers quickly and correctly complete the installation and commissioning of the transformer.
Through the above professional packaging and transportation solutions, we ensure that the NPC ELECTRIC 630kVA oil-immersed transformer can be fully protected during transportation, arrive at the destination smoothly, and maintain the best working condition.
For cross-border transportation, the transformer will be transported by container shipping or special cargo ships (for super-large transformers). For goods that require a longer transportation time, bulk transportation is used. The loading and unloading of the transformer are operated by a professional lifting team, using equipment such as hooks and slings to lift it from a fixed point to ensure that no damage is caused to the equipment during operation.
All documents required for export, such as packing lists, commercial invoices, bills of lading, test reports, certificates of origin, etc., will be prepared in advance and provided with the goods.
The outside of the package is marked with clear unloading instructions, such as "fragile", "handle with care", "keep upright" and other warnings to ensure safety during transportation and unloading. Detailed installation instructions and operating manuals are provided to help customers quickly and correctly complete the installation and commissioning of the transformer.
Through the above professional packaging and transportation solutions, we ensure that the NPC ELECTRIC 630kVA oil-immersed transformer can be fully protected during transportation, arrive at the destination smoothly, and maintain the best working condition.
32
32 years of industry experience
Manufacturer Test
630kVA Oil Immersed Transformer
Progress Test
During the production process, NPC ELECTRIC's 630kVA oil-immersed transformers are tested in strict accordance with international standards. First, the core and windings of the transformer undergo rigorous electrical performance tests to ensure that they meet the design requirements. Subsequently, the oil-immersed transformer is subjected to a high-voltage test to test its withstand voltage and insulation performance. After the transformer is assembled, a load test is carried out to ensure stable operation under different loads. Finally, a temperature rise test is carried out to verify its temperature control ability during long-term operation to ensure that the product quality meets customer requirements and industry standards.
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 transformer leaves the factory, NPC ELECTRIC will conduct a comprehensive factory acceptance test to ensure that the equipment meets technical standards and customer requirements.
The test items include insulation resistance test, short circuit impedance test, load test, and oil quality test to ensure the stability and safety of the transformer under various working conditions. No-load current test and no-load loss test are used to verify the energy efficiency and performance of the transformer. The temperature rise test ensures that the transformer will not overheat during operation, to ensure the long service life of the equipment. The partial discharge test is used to check whether there are potential insulation problems in the transformer. All test results are recorded in detail, and a test report and quality certificate are provided.
After passing the inspection, the transformer will be accompanied by a complete quality inspection certificate and finally packed and prepared. This process ensures that each transformer can meet international and industry standards and be reliably put into use.
Routine Test - Transformer Turns Ratio/TTR (All Tap Voltages)
Purpose of Testing
The purpose of the transformer turns ratio (TTR) test is to confirm whether the voltage ratio between each tap of the transformer meets the design requirements and ensure that the transformer winding is connected correctly. By measuring the voltage ratio of each tap, it is possible to detect whether there is a fault or deviation in the transformer winding.
Testing Equipment
TTR tester: such as Doble, Megger, Omicron and other brands of transformer winding ratio tester.
Voltage source: usually AC 10 V to 30 V , used to test different voltages for each tap.
Temperature and humidity meter: used to record environmental conditions during the test to ensure test accuracy.
Current probe: used to measure the load current of the winding and ensure the accuracy of the test results.
Voltage source: usually AC 10 V to 30 V , used to test different voltages for each tap.
Temperature and humidity meter: used to record environmental conditions during the test to ensure test accuracy.
Current probe: used to measure the load current of the winding and ensure the accuracy of the test results.
Pre-Test Preparation
Disconnect all transformer tap-changers from the power supply and ensure that all equipment is properly grounded and discharged.
Perform the test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C). Avoid high humidity or bad weather that may affect the test accuracy.
Perform the test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C). Avoid high humidity or bad weather that may affect the test accuracy.
Test Progress
Perform the test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C). Avoid high humidity or bad weather that may affect the test accuracy.
Measure and Record
Start the test and record the following parameters:
The voltage ratio between the windings
Deviation of the measured value from the rated ratio
The voltage ratio between the windings
Deviation of the measured value from the rated ratio
Temperature Correction
If necessary, perform temperature correction on the measured turns ratio data (especially when testing at higher or lower temperatures). Generally, the standard reference temperature for temperature correction is 20°C.
Repeat Testing (if necessary)
Test the transformer's windings of different voltage levels (high voltage, medium voltage, and low voltage) separately to ensure that the turns ratios of all windings are normal.
Evaluation Criteria (Reference)
Turns ratio error ≤ 0.5% (pass)
0.5% < Turns ratio error ≤ 1% (caution)
Turns ratio error > 1% (further inspection or corrective action required)
0.5% < Turns ratio error ≤ 1% (caution)
Turns ratio error > 1% (further inspection or corrective action required)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Power Distribution Networks, Industrial Applications, Infrastructure & Public Utilities
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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