500kVA Oil Immersed Transformer
The 500kVA oil-immersed transformer complies with ANSI, CSA, NEMA, IEEE, IEC, GB, and DOE standards. NPC ELECTRIC'S 500kVA oil-immersed transformers have a solid core and winding construction using high-quality materials to ensure optimum performance. The core is made of cold-rolled silicon steel sheets to minimize energy loss and increase thermal stability. The windings are constructed with high-grade copper wire for excellent conductivity and heat dissipation.
- 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 Oil immersed distribution transformer
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA, IEC
- Application Industrial and Commercial Power Distribution Systems
- Power Rating 500kVA
- Certificate UL ,ISO ,CE
- Cooling Method ONAN, ONAN/ONAF, KNAN, KNAN/KNAF
- Oil Mineral Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
500kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 500 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 | |
| Color | ANSI 70 Light gray/Munsell 7GY3.29/1.5 or customized, etc | |
| Tank material | Mild Steel, 304 Stainless Steel | |
| Insulating Oil Weight | 575 kg | |
| Total Weight | 2500 kg | |
| Outline Dimensions（L×W×H）in. | 2000 × 1500 × 2000（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer |
| Oil level gauge |
| Oil temperature indicator |
| Pressure relief device |
| Pressure vacuum gauge |
| Lifting hook for complete transformer |
| Name plate |
| Radiators |
| Oil upper filtering valve |
| Oil drain valve with 3/8" sampler |
Customization Optional
500kVA Oil Immersed Transformer
NPC ELECTRIC’s three-phase oil-immersed transformers can provide a variety of optional specifications according to customer needs. The cooling method can be selected as natural oil circulation (ONAN) or forced oil circulation (OFAF) to adapt to different operating environments and load requirements. The transformer winding can be made of high-conductivity copper or aluminum materials to optimize cost and performance. The core material can be selected from low-loss, high-quality silicon steel sheets to improve energy efficiency and reduce no-load losses. The input/output voltage level, tap range, and frequency can be customized to meet the requirements of different power grids.
The housing can be equipped with standard protection levels (such as IP54 or IP65) for outdoor or harsh environments. It can be equipped with an intelligent temperature control system, oil level monitoring, and a pressure relief device to improve safety and reliability. An explosion-proof protection device, a low-noise design, or a remote monitoring function can also be selected to meet specific industry needs.
Packing and Shipping
500kVA Oil Immersed Transformer
In order to ensure that the NPC ELECTRIC 500kVA three-phase oil-immersed transformer is safe and stable during transportation to prevent damage, professional packaging is used.
The transformer is fixed on a sturdy wooden pallet to maintain stability and prevent tilting or displacement. Rubber shock-absorbing pads are used at key stress-bearing parts to reduce the impact of vibration during transportation. The outside of the transformer is covered with moisture-proof and rust-proof plastic film to avoid being affected by the external environment.
The outside is packed with high-strength wooden boxes or steel frame structures to prevent the transformer from being hit during long-distance transportation. Indicators such as "lifting point", "no tilting", and "fragile" are marked on the outside of the package to ensure correct loading and unloading. The transformer is equipped with a silicone desiccant to prevent moisture from affecting its performance during transportation.
The accessories, such as the bushing, oil pillow, and thermostat of the transformer, are packed separately and placed in a special wooden box to avoid damage. The nameplate, technical manual, test report, certificate of conformity, and other documents are packed in a waterproof document bag and included with the goods.
NPC ELECTRIC's 500kVA three-phase oil-immersed transformer is packaged in a sturdy and protective design, combined with efficient logistics and transportation, to ensure that the equipment arrives at the customer site intact and safe.
The transformer is fixed on a sturdy wooden pallet to maintain stability and prevent tilting or displacement. Rubber shock-absorbing pads are used at key stress-bearing parts to reduce the impact of vibration during transportation. The outside of the transformer is covered with moisture-proof and rust-proof plastic film to avoid being affected by the external environment.
The outside is packed with high-strength wooden boxes or steel frame structures to prevent the transformer from being hit during long-distance transportation. Indicators such as "lifting point", "no tilting", and "fragile" are marked on the outside of the package to ensure correct loading and unloading. The transformer is equipped with a silicone desiccant to prevent moisture from affecting its performance during transportation.
The accessories, such as the bushing, oil pillow, and thermostat of the transformer, are packed separately and placed in a special wooden box to avoid damage. The nameplate, technical manual, test report, certificate of conformity, and other documents are packed in a waterproof document bag and included with the goods.
NPC ELECTRIC's 500kVA three-phase oil-immersed transformer is packaged in a sturdy and protective design, combined with efficient logistics and transportation, to ensure that the equipment arrives at the customer site intact and safe.
32
32 years of industry experience
Manufacturer Test
500kVA Oil Immersed Transformer
Progress Test
NPC ELECTRIC’s three-phase oil-immersed transformers are subject to rigorous process testing during the production process to ensure quality and performance. First, raw materials such as silicon steel sheets and copper windings are subject to factory inspection to ensure compliance with technical standards. After the windings and cores are assembled, DC resistance tests and insulation withstand voltage tests are carried out to detect electrical performance. Finished transformers are subject to induced withstand voltage and partial discharge tests to verify the reliability of the insulation system. Load loss and no-load loss tests are used to evaluate the operating efficiency and energy consumption level of the transformer. Finally, after the transformer is oil-treated and sealed, it undergoes factory testing to ensure its safety and stability under various operating conditions.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ 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)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Transformer Factory Acceptance Test
The Factory Acceptance Test (FAT) of 500 kVA three-phase oil-immersed transformers is designed to ensure that the product meets technical standards and customer requirements. First, a visual inspection is carried out to confirm that the transformer is structurally intact, clearly marked, and free of mechanical damage. This is followed by a winding DC resistance test to detect whether the winding resistance meets the design standards. The insulation withstand voltage test is used to verify the insulation strength of the transformer to ensure its safety under high-voltage operation. The induction withstand voltage test is used to check the electrical performance of the core and windings to prevent potential insulation failures. The partial discharge test is used to detect insulation defects inside the transformer to ensure long-term reliable operation. The no-load loss and load loss tests evaluate the energy efficiency of the transformer to ensure that the specified performance parameters are met. The ratio and polarity test are used to verify the voltage conversion capability and phase sequence correctness of the transformer. The temperature rise test simulates the actual operating environment to ensure that the temperature change of the transformer under rated load is within a safe range. Finally, an oil sample analysis is carried out to test the insulation properties and moisture content of the transformer oil to ensure that the quality of the oil meets the standards.
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
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Industrial and Commercial Power Distribution Systems
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Transformers Packaging (1)
Transformers Packaging (2)
Transformers Packaging (3)
Transformers Packaging (4)
Transformers Packaging (5)
Transformers Packaging (6)
Transformers Packaging (7)
Transformers Packaging (8)
Related Products
250kVA Single Phase Pad Mounted Transformer
NPC ELECTRIC 250 kVA single phase pad mounted transformer operates safely, reliably, and efficiently and can be installed indoors and outdoors. The industrial transformer has a rated power of 250 kVA, a primary voltage of 27600/16000V single-phase and a secondary voltage of 120/240V single-phase.The transformer has a primary loop feed and dead front primary connections.
1500kVA Oil Immersed Transformer
NPC ELECTRIC's 1500kVA oil-immersed transformer adopts advanced technology, complies with international IEC, ANSI, and other standards, and has efficient and stable power conversion capabilities. It uses oil-immersed cooling technology, has excellent heat dissipation performance and durability, and ensures long-term stable operation of the equipment in harsh environments.
5kVA Conventional Type Single Phase Pole Mounted Transformer
NPC ELECTRIC has been focusing on the production of 5kVA Conventional Type Single Phase Pole Mounted transformer for decades, complying with international standards such as IEC 60076, ISO 9001, IEEE C57.12.00, etc. to ensure its safety, performance and reliability. NPC ELECTRIC’s 5kVA conventional single-phase pole-mounted transformer is a small power transformer equipment, usually installed on power poles. This transformer is widely used in daily life and small industrial fields for its reliability and efficient power conversion capabilities, ensuring a stable and safe power supply.
500kVA Dry Type Transformer
NPC ELECTRIC 500kVA Dry-Type Transformer offers reliable and efficient power distribution with a compact, oil-free design. It ensures safe, low-maintenance operation with advanced insulation and cooling systems, making it ideal for industrial and commercial use. With a capacity of 500kVA, it delivers stable performance while being environmentally friendly and cost-effective.
3000kVA Dry Type Transformer
3000kVA Dry Type Transformer is a high-performance, reliable power solution designed to meet the needs of large industrial and commercial facilities. With a 3000kVA capacity, it utilizes advanced dry-type insulation, ensuring exceptional safety, minimal maintenance, and extended durability. Built for demanding environments, this transformer provides stable, efficient, and low-noise operation while minimizing environmental impact. The NPC ELECTRIC 3000kVA Dry Type Transformer is the ideal choice for ensuring reliable and efficient power distribution in large-scale applications.
15kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
NPC ELECTRIC the production of 15 kVA Completely Self-Protected (CSP) single-phase overhead transformers, meticulously engineered to meet international standards such as IEEE C57.12.00, IEEE C57.12.20, DOE-2016 Efficiency, CSA C2.1, and CSA C2.2. These certifications underscore to delivery products that are both safe and reliable. NPC electric transformers are designed to comply with the DOE 2016 efficiency standards, ensuring optimal energy efficiency and reduced operational costs. Understanding the diverse needs of our clients, NPC Electric offers a wide range of customizable voltage levels to suit various applications. Perfect manufacturing processes enable us to maintain short production cycles, ensuring timely delivery.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.
Welcome your inquiry
Honesty, Integrity, Frugality, Activeness and Passion