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630kVA Dry type transformer4
630kVA Dry type transformer
630kVA Dry type transformer 2
630kVA Dry type transformer 3
630kVA Dry type transformer4
630kVA Dry type transformer
630kVA Dry type transformer 2
630kVA Dry type transformer 3

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.
630kVA Dry type transformer package
630kVA Dry type transformer package mini
32
32 years of industry experience

Manufacturer Test

630kVA Dry Type Transformer
630kVA Dry type transformer Progress Test

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.

630kVA Dry type transformer  Design Tests

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

China NPC ELECTRIC

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.)
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.
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 .
Measure and Record
Start the test and record the following parameters:
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
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.
630kVA Dry type Transformer Routine Test

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

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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.

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