1250kVA Dry Type Transformer
NPC ELECTRIC 1250kVA Dry-Type Transformer delivers reliable, oil-free power distribution with a compact and efficient design. Featuring advanced insulation and cooling systems, it ensures safe, low-maintenance operation, making it ideal for industrial and commercial applications. It provides environmentally friendly, cost-effective performance with a 1250kVA capacity.
- 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 distribution networks, office buildings, transportation facilities, theaters, hospitals, hotels etc
- Power Rating 1250kVA
- Certificate UL ,CESI
- Cooling Method OA/OF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
1250kVA Dry Type Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 1250 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 | 7000 kg | |
| Outline Dimensions（L×W×H）in. | 2200×1850×2680（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
1250kVA Dry Type Transformer
Our transformers offer a range of core features designed to meet diverse application needs and ensure reliable performance. The 1250kVA Dry-Type Transformer provides reliable, oil-free power distribution with a robust and compact design. Key features include high-performance insulation for enhanced safety, low noise operation, and minimal maintenance. It is ideal for industrial and commercial use, offering environmentally friendly, efficient, and cost-effective performance.
Packing and Shipping
1250kVA 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 1250kVA Dry-Type Transformer is meticulously packed and shipped to ensure it arrives safely and undamaged. The transformer is first wrapped in moisture-resistant plastic or shrink film to protect it from dust, dirt, and humidity during transit. It is then securely placed on a heavy-duty wooden pallet or within a custom-built wooden crate, providing robust support and ensuring stability during handling.
To further safeguard against impacts and vibrations, the transformer is cushioned with shock-absorbing materials such as foam padding, rubber, or wooden blocks. Clear shipping labels are applied, indicating the transformer’s weight, dimensions, and special handling instructions to ensure correct handling throughout the shipping process.
The transformer is transported by experienced logistics providers, adhering to international standards for heavy machinery transport.
Upon arrival, the packaging is carefully removed, and the transformer is thoroughly inspected for any transit-related damage before installation and use.
The 1250kVA Dry-Type Transformer is meticulously packed and shipped to ensure it arrives safely and undamaged. The transformer is first wrapped in moisture-resistant plastic or shrink film to protect it from dust, dirt, and humidity during transit. It is then securely placed on a heavy-duty wooden pallet or within a custom-built wooden crate, providing robust support and ensuring stability during handling.
To further safeguard against impacts and vibrations, the transformer is cushioned with shock-absorbing materials such as foam padding, rubber, or wooden blocks. Clear shipping labels are applied, indicating the transformer’s weight, dimensions, and special handling instructions to ensure correct handling throughout the shipping process.
The transformer is transported by experienced logistics providers, adhering to international standards for heavy machinery transport.
Upon arrival, the packaging is carefully removed, and the transformer is thoroughly inspected for any transit-related damage before installation and use.
32
32 years of industry experience
Manufacturer Test
1250kVA Dry Type Transformer
Progress Test
NPC Electric manufactures high-quality three-phase dry-type transformers under strict quality control protocols. The 1250kVA Dry-Type Transformer undergoes a thorough series of progress tests to ensure it meets stringent quality and performance standards. These tests include verification of voltage ratio, insulation resistance, and load testing under normal operating conditions. The transformer is also subjected to temperature rise tests to confirm effective heat dissipation and safe operation. Additional tests, such as partial discharge, no-load loss, and short-circuit tests, are carried out to ensure the transformer’s reliability, efficiency, and durability. All testing procedures are conducted according to international standards, ensuring the transformer performs optimally and safely in all real-world applications.
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 1250kVA 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 - Induced Voltage
Purpose of Testing
The purpose of the Induced Voltage test is to simulate the electrical stress that the equipment may encounter under actual working conditions by applying an induced voltage, thereby evaluating the tolerance and stability of the equipment's insulation system. This test helps to detect the insulation performance of the equipment under high voltage conditions and ensure its safety and reliability in operation.
Testing Equipment
Induced Voltage Tester (e.g. OMICRON, Megger, HioKI, etc.)
AC voltage source, commonly 2 kV, 5 kV, 10 kV, or customized according to test requirements.
Environmental thermometer and hygrometer, used to record the temperature and humidity of the environment for appropriate test evaluation.
AC voltage source, commonly 2 kV, 5 kV, 10 kV, or customized according to test requirements.
Environmental thermometer and hygrometer, used to record the temperature and humidity of the environment for appropriate test evaluation.
Pre-Test Preparation
Disconnect all relevant power supplies and ensure that the equipment is properly grounded and discharged.
Check the connection wires and terminals to ensure they are secure and free of contamination.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Check the connection wires and terminals to ensure they are secure and free of contamination.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test equipment to the appropriate terminals or bushings of the device under test, ensuring that the connections are secure and properly grounded.
Apply Test Voltage:
Select the appropriate induction voltage according to the rated voltage and standard of the equipment.
Connect the test equipment to the appropriate terminals or bushings of the device under test, ensuring that the connections are secure and properly grounded.
Apply Test Voltage:
Select the appropriate induction voltage according to the rated voltage and standard of the equipment.
Measure and Record
Start the test and record the following parameters:
Induced Voltage
Applied Current
Voltage peak, stability and waveform (waveform analysis)
Any abnormal current or voltage changes during the measurement process.
Induced Voltage
Applied Current
Voltage peak, stability and waveform (waveform analysis)
Any abnormal current or voltage changes during the measurement process.
Temperature Correction
The measured induced voltage data is corrected to the reference temperature (usually 20°C) to ensure the accuracy of the test results.
Repeat Testing (if necessary)
If necessary, test different windings (HV, MV, LV) and bushings separately and compare the results at different test points.
Evaluation Criteria (Reference)
Inductive voltage ≤ 1% (Excellent): normally and meets safety standards.
1% < Inductive voltage ≤ 3% (Good): still within acceptable range.
Inductive voltage > 3% : faulty or not meet safety requirements and requires further analysis and repair.
1% < Inductive voltage ≤ 3% (Good): still within acceptable range.
Inductive voltage > 3% : faulty or not meet safety requirements and requires further analysis and repair.
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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