6300kVA Dry Type Transformer
The NPC ELECTRIC 6300kVA Dry Type Transformer is a high-performance, heavy-duty power solution designed for large industrial and commercial applications. With a capacity of 6300kVA, it features cutting-edge dry-type insulation technology, offering superior safety, low maintenance, and extended reliability. Built to withstand demanding operating conditions, this transformer provides stable, efficient, and noise-free performance while minimizing environmental impact.
- 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 6300kVA
- 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
6300kVA Dry Type Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 6300 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 | 65400 kg | |
| Outline Dimensions（L×W×H）in. | 5000×3000×3700（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
6300kVA Dry Type Transformer
The 6300kVA Dry-Type Transformer from NPC Electric is designed for high-capacity power distribution in large-scale industrial and commercial applications. It features advanced solid insulation technology, eliminating the need for oil and ensuring both environmental safety and minimal maintenance. Built with durable materials, it offers exceptional thermal performance and operates reliably under heavy loads. Its compact design allows for efficient space utilization, while its long-term reliability and energy efficiency make it a cost-effective solution for demanding power requirements.
Packing and Shipping
6300kVA Dry Type Transformer
The Packing and Shipping process for the NPC Electric 2500kVA Dry-Type Transformer is designed to ensure the safe and secure transportation of the transformer from the manufacturing facility to its final destination. After the transformer undergoes a thorough quality inspection and testing process, it is carefully cleaned to remove any dust, debris, or contaminants that might have accumulated during manufacturing. The packing process begins by securing the transformer in a durable and protective wooden crate or metal frame, which is custom-built to fit the transformer’s dimensions and provide robust protection during transit. The crate or frame is equipped with internal cushioning materials, such as foam or rubber pads, to absorb shocks and vibrations, protecting sensitive components like bushings, terminals, and the insulation system from potential damage.
To prevent moisture, dust, or environmental contaminants from affecting the transformer during transport, it is wrapped in weather-resistant plastic or shrink-wrapped. Additionally, the transformer is securely fastened inside the crate to prevent any movement that could result in physical damage. The outer packaging is clearly labeled with important information such as the model number, weight, handling instructions, and any relevant safety warnings, ensuring proper handling throughout the shipping process.
All required shipping documentation is included, such as customs clearance forms, inspection certificates, and safety compliance certificates, especially for international shipments, to facilitate smooth customs processing and compliance with regulations. The transformer is carefully handled during loading and unloading, using specialized lifting equipment such as cranes or forklifts to avoid any impact that could damage the transformer. It is then transported by road, sea, or rail, depending on the final destination and transport requirements.
Once the transformer arrives at its destination, it undergoes a final inspection to ensure it has not been damaged during the shipping process. After passing this inspection, the transformer is ready for installation and use. The packing and shipping process ensures that the NPC Electric 2500kVA Dry-Type Transformer reaches its destination safely and is ready for reliable, efficient operation upon installation.
To prevent moisture, dust, or environmental contaminants from affecting the transformer during transport, it is wrapped in weather-resistant plastic or shrink-wrapped. Additionally, the transformer is securely fastened inside the crate to prevent any movement that could result in physical damage. The outer packaging is clearly labeled with important information such as the model number, weight, handling instructions, and any relevant safety warnings, ensuring proper handling throughout the shipping process.
All required shipping documentation is included, such as customs clearance forms, inspection certificates, and safety compliance certificates, especially for international shipments, to facilitate smooth customs processing and compliance with regulations. The transformer is carefully handled during loading and unloading, using specialized lifting equipment such as cranes or forklifts to avoid any impact that could damage the transformer. It is then transported by road, sea, or rail, depending on the final destination and transport requirements.
Once the transformer arrives at its destination, it undergoes a final inspection to ensure it has not been damaged during the shipping process. After passing this inspection, the transformer is ready for installation and use. The packing and shipping process ensures that the NPC Electric 2500kVA Dry-Type Transformer reaches its destination safely and is ready for reliable, efficient operation upon installation.
32
32 years of industry experience
Manufacturer Test
6300kVA Dry Type Transformer
Progress Test
The Progress Test for the NPC Electric 6300kVA Dry-Type Transformer involves a series of critical checks to ensure its safety and performance. It begins with an insulation resistance test to verify the effectiveness of the transformer’s insulation system. Next, a winding resistance test is conducted to ensure the primary and secondary windings are free from faults. The dielectric withstand test confirms the transformer can handle overvoltage conditions. A temperature rise test is performed under full-load conditions to ensure that the transformer remains within safe temperature limits during operation. The load test assesses the transformer’s efficiency and voltage regulation under varying loads. The short-circuit impedance test ensures the transformer can safely withstand fault conditions. A noise level test is done to ensure the transformer operates within acceptable sound limits. Finally, a mechanical integrity test checks that all components are securely assembled. After all tests are completed, a test report is generated to confirm the transformer is ready for safe and reliable operation.
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 6300kVA 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 - Impulse Tests
Purpose of Testing
The purpose of Impulse Tests is to verify the insulation strength of electrical equipment when it is subjected to lightning strikes or switching overvoltages. By applying high-energy impulse voltages, it is possible to detect potential defects in the insulation system.
Testing Equipment
Impulse voltage generator (e.g. Haefely, Hipotronics, Tettex, etc.)
Voltage divider (used to measure impulse voltage waveform, resistor divider or capacitor divider)
Oscilloscope (used to record impulse waveform, common brands such as Tektronix, Keysight)
Voltage divider (used to measure impulse voltage waveform, resistor divider or capacitor divider)
Oscilloscope (used to record impulse waveform, common brands such as Tektronix, Keysight)
Pre-Test Preparation
Please test under suitable environmental conditions: relative humidity less than 65%, no rain or condensation (recommended temperature: 15-30°C).
Calibrate and check the impulse voltage generator, measurement system, and control system to ensure that the instruments and equipment are in good condition and meet the test standards.
Calibrate and check the impulse voltage generator, measurement system, and control system to ensure that the instruments and equipment are in good condition and meet the test standards.
Test Progress
Connect the Test Instrument:
Connect the impulse voltage generator correctly to each winding terminal (high voltage terminal, ground terminal) of the device under test, and ensure that all test instruments are well grounded.
Apply Test Voltage:
Select the appropriate impulse voltage waveform and amplitude according to the rated voltage of the equipment
Connect the impulse voltage generator correctly to each winding terminal (high voltage terminal, ground terminal) of the device under test, and ensure that all test instruments are well grounded.
Apply Test Voltage:
Select the appropriate impulse voltage waveform and amplitude according to the rated voltage of the equipment
Measure and Record
Collect and record the impact waveform, including:
Front Time
Time to Half-Value
Peak Voltage
Distortion
Ambient temperature and humidity (especially when the test environment needs to be corrected)
Front Time
Time to Half-Value
Peak Voltage
Distortion
Ambient temperature and humidity (especially when the test environment needs to be corrected)
Temperature Correction
Check whether the impulse voltage waveform meets the specification requirements (wave head time 1.2μs ±30%, half-peak time 50μs ±20%).
If the waveform deviation is too large, adjust the impulse generator parameters and reapply the test.
If the waveform deviation is too large, adjust the impulse generator parameters and reapply the test.
Repeat Testing (if necessary)
Impact tests are performed for different phases and windings (HV/MV/LV).
In special cases, inter-winding impact, voltage-to-ground impact or coil corner impact are performed (according to the test plan).
In special cases, inter-winding impact, voltage-to-ground impact or coil corner impact are performed (according to the test plan).
Evaluation Criteria (Reference)
No internal insulation breakdown or flashover (detected by observing waveform continuity and audibly).
Waveforms are stable and meet standard specifications.
Waveform variations between repeated tests are minimal (usually good waveform overlap with no noticeable abnormal excursions).
Waveforms are stable and meet standard specifications.
Waveform variations between repeated tests are minimal (usually good waveform overlap with no noticeable abnormal excursions).
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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