7500kVA Dry Type Transformer
7500kVA Dry Type Transformer is a high-capacity, reliable power solution designed for large-scale industrial and commercial applications. With a robust 7500kVA rating, it incorporates advanced dry-type insulation technology, ensuring enhanced safety, minimal maintenance, and exceptional durability. Engineered for demanding environments, this transformer delivers stable, efficient, and low-noise operation while reducing environmental impact. The NPC ELECTRIC 7500kVA Dry Type Transformer is the ideal choice for high-power applications, providing secure and continuous power distribution for critical infrastructure.
- 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 office buildings, transportation facilities，theaters, hospitals, hotels etc
- Power Rating 7500kVA
- 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
7500kVA Dry Type Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 7500 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 | 76800 kg | |
| Outline Dimensions（L×W×H）in. | 5500×3200×4200（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
7500kVA Dry Type Transformer
The 7500kVA Dry-Type Transformer from NPC Electric is built for high-demand industrial and commercial applications, offering reliable power distribution with advanced solid insulation technology. By eliminating the need for oil, it reduces environmental impact and lowers maintenance costs. Its robust construction ensures superior thermal performance and efficient heat dissipation, even under heavy loads. The transformer’s compact design allows for easy installation in space-constrained environments, while its energy-efficient operation and long-term durability provide a reliable, low-maintenance solution for large-scale power needs.
Packing and Shipping
7500kVA Dry Type Transformer
The Packing and Shipping process for the NPC Electric 7500kVA Dry-Type Transformer is a meticulously designed procedure to ensure the safe, secure, and efficient delivery of the transformer to its final destination while preserving its quality and operational readiness. After the transformer passes all necessary quality inspections and testing, it is carefully cleaned to remove any manufacturing debris, dust, or residues. Once cleaned, the transformer is securely packed into a custom-built, durable wooden crate or metal frame. This packaging is specifically designed to provide robust protection against potential physical damage during transport. The crate or frame is reinforced with internal padding materials, such as foam, rubber inserts, or shock-absorbing materials, to protect sensitive components like bushings, terminals, and insulation from any shocks, vibrations, or impacts that may occur during transit.
The transformer is carefully fastened within the crate or frame to ensure that it does not move during handling and shipping, further minimizing the risk of damage. To protect it from external environmental factors such as moisture, dirt, and dust, the transformer is often wrapped in weather-resistant plastic or shrink-wrapped, providing an extra layer of protection during transport. The packaging is clearly labeled with essential information, including the model number, weight, handling instructions, and safety precautions, ensuring that the transformer is properly identified and handled with care at each stage of the shipping process.
For international shipments, all necessary shipping documentation, including customs clearance forms, inspection certificates, safety compliance reports, and other required paperwork, is prepared and included to ensure smooth customs processing and regulatory compliance at the destination country. The transformer is handled using specialized lifting equipment, such as cranes or forklifts, to ensure it is loaded and unloaded safely without the risk of damage.
The transformer is then transported by the most suitable method—road, sea, or rail—depending on the destination, distance, and other logistical factors. Upon arrival at the destination, the transformer is carefully unloaded and undergoes a final inspection to confirm that no damage occurred during the shipping process. Once the inspection is completed successfully, the transformer is ready for installation and commissioning. The entire packing and shipping process ensures that the NPC Electric 7500kVA Dry-Type Transformer is securely delivered, fully protected, and ready for reliable, efficient operation upon installation.
The transformer is carefully fastened within the crate or frame to ensure that it does not move during handling and shipping, further minimizing the risk of damage. To protect it from external environmental factors such as moisture, dirt, and dust, the transformer is often wrapped in weather-resistant plastic or shrink-wrapped, providing an extra layer of protection during transport. The packaging is clearly labeled with essential information, including the model number, weight, handling instructions, and safety precautions, ensuring that the transformer is properly identified and handled with care at each stage of the shipping process.
For international shipments, all necessary shipping documentation, including customs clearance forms, inspection certificates, safety compliance reports, and other required paperwork, is prepared and included to ensure smooth customs processing and regulatory compliance at the destination country. The transformer is handled using specialized lifting equipment, such as cranes or forklifts, to ensure it is loaded and unloaded safely without the risk of damage.
The transformer is then transported by the most suitable method—road, sea, or rail—depending on the destination, distance, and other logistical factors. Upon arrival at the destination, the transformer is carefully unloaded and undergoes a final inspection to confirm that no damage occurred during the shipping process. Once the inspection is completed successfully, the transformer is ready for installation and commissioning. The entire packing and shipping process ensures that the NPC Electric 7500kVA Dry-Type Transformer is securely delivered, fully protected, and ready for reliable, efficient operation upon installation.
32
32 years of industry experience
Manufacturer Test
7500kVA Dry Type Transformer
Progress Test
The Progress Test for the NPC Electric 7500kVA Dry-Type Transformer involves a series of essential tests to verify its performance, safety, and reliability. The process starts with an insulation resistance test to ensure the integrity of the transformer’s insulation system. This is followed by a winding resistance test to check for any defects in the primary and secondary windings. The dielectric withstand test ensures the transformer can handle overvoltage conditions without damage. A temperature rise test is conducted to monitor the transformer's performance under full load, ensuring it stays within safe temperature limits. The load test checks the transformer’s voltage regulation and efficiency under various load conditions. The short-circuit impedance test assesses the transformer's ability to withstand fault situations. A noise level test ensures the transformer operates within acceptable sound limits. Lastly, a mechanical integrity test confirms that all components are properly assembled and secure. Upon successful completion of these tests, a test report is generated to certify the transformer's readiness for 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 7500kVA 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
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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