630kVA Dry Type Transformer
NPC ELECTRIC 630kVA Dry-Type Transformer is a compact, oil-free solution for reliable power distribution. With advanced insulation and cooling systems, it ensures safe, low-maintenance operation, making it ideal for industrial and commercial applications. Offering 630kVA capacity, it delivers efficient, environmentally friendly, and cost-effective performance.
- 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 Dry type transformer
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA,IEC,GB
- Application residential power distribution, power systems and distribution networks, office buildings, transportation facilities，theaters, hospitals, hotels etc
- Power Rating 630kVA
- Certificate UL ,CESI, ISO
- Cooling Method OA/OF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
630kVA Dry Type 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 | |
| Enclosure material | 304 Stainless Steel | |
| Total Weight | 2580 kg | |
| Outline Dimensions（L×W×H）in. | 1680×1460×1960（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
630kVA Dry Type Transformer
Our transformers offer a range of core features designed to meet diverse application needs and ensure reliable performance. The 630kVA Dry-Type Transformer provides reliable, efficient, and environmentally friendly power distribution. Key features include oil-free operation, advanced insulation for enhanced safety, low noise levels, and minimal maintenance. Its compact design makes it ideal for industrial and commercial applications, ensuring long-lasting, cost-effective performance.
Packing and Shipping
630kVA Dry Type Transformer
NPC ELECTRIC’s dry-type transformers are meticulously packaged for secure sea freight and long-distance transport, ensuring they arrive at their destination in perfect condition and ready for installation.
The 630kVA Dry-Type Transformer is carefully packed and shipped to ensure safe and secure delivery. The transformer is first wrapped in protective plastic or moisture-resistant film to shield it from dust, moisture, and environmental factors during transit. It is then placed on a sturdy wooden pallet or inside a custom-made wooden crate, providing solid support and protection from physical impacts during handling and transport.
To prevent movement, shock-absorbing materials, such as foam or bubble wrap, are used to cushion the transformer, ensuring it remains stable and undamaged.
The unit is clearly labeled with shipping marks, including weight, dimensions, and handling instructions, to ensure proper care during loading, unloading, and transportation.
The transformer is shipped through reliable and experienced logistics providers, adhering to international standards for packaging and shipping.
Once the transformer reaches its destination, the packaging is carefully removed, and the unit is thoroughly inspected for any potential shipping damage before installation.
The 630kVA Dry-Type Transformer is carefully packed and shipped to ensure safe and secure delivery. The transformer is first wrapped in protective plastic or moisture-resistant film to shield it from dust, moisture, and environmental factors during transit. It is then placed on a sturdy wooden pallet or inside a custom-made wooden crate, providing solid support and protection from physical impacts during handling and transport.
To prevent movement, shock-absorbing materials, such as foam or bubble wrap, are used to cushion the transformer, ensuring it remains stable and undamaged.
The unit is clearly labeled with shipping marks, including weight, dimensions, and handling instructions, to ensure proper care during loading, unloading, and transportation.
The transformer is shipped through reliable and experienced logistics providers, adhering to international standards for packaging and shipping.
Once the transformer reaches its destination, the packaging is carefully removed, and the unit is thoroughly inspected for any potential shipping damage before installation.
32
32 years of industry experience
Manufacturer Test
630kVA Dry Type Transformer
Progress Test
NPC Electric manufactures high-quality three-phase dry-type transformers under strict quality control protocols. The 630kVA Dry-Type Transformer undergoes a series of rigorous progress tests to ensure optimal performance and reliability. These tests include verification of the voltage ratio, insulation resistance, and load capacity under typical operational conditions. The transformer is also tested for temperature rise to confirm effective heat dissipation and safe operation. In addition, partial discharge and no-load loss tests are conducted to ensure the highest quality standards are met. All tests are performed in line with international standards, and the transformer is thoroughly inspected to guarantee its long-term performance and safety before delivery.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ Insulation Power Factor
♦ 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)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
Transformer Factory Acceptance Test
NPC Electric conducts rigorous quality control testing on every transformer or representative samples, as well as on specific components and materials, to ensure compliance with design specifications throughout the production process.
The Factory Acceptance Test (FAT) for a 630kVA three-phase dry-type transformer is a critical step performed before shipment to verify that the unit meets all applicable standards and delivers optimal performance. The FAT includes the following key procedures:
Visual Inspection: Evaluates the transformer’s physical condition, including the enclosure, terminals, and labeling, to ensure conformance with design and safety requirements.
Electrical Testing: Involves measuring winding resistance, insulation resistance, and performing turns ratio tests to validate electrical integrity and functionality.
Dielectric Strength Test: Applies high voltage across the insulation system to ensure it can endure both normal and transient operating voltages without failure.
Load Testing: Simulates real-world operating conditions to assess the transformer’s voltage regulation, temperature rise, and overall efficiency under load.
Protection Device Testing: Verifies the proper operation of integrated protective components such as thermal sensors, temperature relays, and tap changers (if applicable).
Routine Test - DC Insulation Resistance Test
Purpose of Testing
The purpose of DC insulation resistance testing is to measure the insulation resistance of a device by applying a DC voltage, thereby evaluating the health of the insulation material and the voltage withstand capability of the electrical device. This test helps detect potential insulation aging, moisture or damage, preventing electrical failures in the device.
Testing Equipment
Insulation resistance tester (e.g. Megger, Fluke, Hioki, Klein Tools, etc.)
Voltage source (usually 500V, 1000V, 2500V, or customized according to customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test to ensure that the test conditions meet the standard requirements.)
Voltage source (usually 500V, 1000V, 2500V, or customized according to customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test to ensure that the test conditions meet the standard requirements.)
Pre-Test Preparation
Make sure the device is properly grounded and fully discharged to prevent residual charge in the device from affecting the test results.
Perform the test under suitable environmental conditions. It is recommended to have a relative humidity below 75%, no rain, and a temperature range of 20-30°C to avoid moisture or temperature fluctuations affecting the test results.
Perform the test under suitable environmental conditions. It is recommended to have a relative humidity below 75%, no rain, and a temperature range of 20-30°C to avoid moisture or temperature fluctuations affecting the test results.
Test Progress
Connect the Test Instrument:
Connect an insulation resistance tester to the high voltage terminal of the device under test and to ground.
Apply Test Voltage:
Select an appropriate test voltage based on the rated voltage of the equipment .
Connect an insulation resistance tester to the high voltage terminal of the device under test and to ground.
Apply Test Voltage:
Select an appropriate test voltage based on the rated voltage of the equipment .
Measure and Record
Start the test and record the following parameters:
Insulation resistance value (MΩ)
Applied voltage
Ambient temperature and humidity during testing
Insulation resistance value (MΩ)
Applied voltage
Ambient temperature and humidity during testing
Temperature Correction
The measured insulation resistance values are corrected to a reference temperature (usually 20°C) for accurate evaluation.
Repeat Testing (if necessary)
Measure different windings (high voltage, medium voltage, low voltage) or each bushing separately, and conduct comparative analysis to ensure the insulation status of all parts.
Evaluation Criteria (Reference)
nsulation resistance ≥ 1000 MΩ (excellent)
500 MΩ ≤ Insulation resistance < 1000 MΩ (good)
100 MΩ ≤ Insulation resistance < 500 MΩ
Insulation resistance < 100 MΩ
500 MΩ ≤ Insulation resistance < 1000 MΩ (good)
100 MΩ ≤ Insulation resistance < 500 MΩ
Insulation resistance < 100 MΩ
Test standard
IEEE C57.12.01 & IEEE C57.12.91 (Dry-Type)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
residential power distribution, power systems and distribution networks, office buildings, transportation facilities，theaters, hospitals, hotels etc
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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