500kVA Single Phase Pad Mounted Transformer
The 500kVA Single Phase Pad Mounted Transformer is a high-capacity electrical transformer designed for reliable and efficient power distribution in commercial, industrial, and utility applications. With a robust, weatherproof enclosure, it is specifically built for outdoor use and can handle the demanding requirements of larger single-phase systems. This transformer offers a 500kVA capacity, ensuring dependable performance for a variety of load conditions.
- 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 480-240/240-120or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Loop Feed or Radial Feed
- BIL 30/95kV
- Standards IEEE, ANSI, CSA
- Application Utility, Residential areas, Commercial hubs, Transportation centers, Airports, industrial facilities
- Power Rating 500kVA
- Certificate UL/cUL, CSA, CESI
- Cooling Method ONAN, ONAN/ONAF, KNAN, KNAN/KNAF
- Oil Minerial Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
500kVA Single Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 500 kVA |
| Rating Primary Voltage | 11950Delta or Customized |
| Secondary Voltage | 480-240V 240-120V 277V Customized |
| Frequency | 50/60Hz |
| Vector Group | Ii0,Ii6 |
| 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 | 620 kg |
| Total Weight | 3650 kg |
| Outline Dimensions（L×W×H）in. | 1500×1200×1800(mm) |
| Lifting Lug | ELSP Fuse |
| Hinged Door | BAY-O-NET Fuse |
| Parking Bracket | Tap Changer |
| Tank Cover | Oil Level Gauge |
| L.V Bushing (4-Hole ) | Pressure Relief Valve |
| Two/Four Position Load break Switch | Vacuum Pressure Gauge |
| HV Grounding Copper Bar | Terminal Block |
| Temperature Indicator | Door Handle |
| H.V Bushing Well | Ground Strap |
| Grounding Copper Bar | Nameplate |
| 1"'Drain Valve With 3/8" Sampler | Non-PCB decal |
| 1" Upper Fill Valve Filter Press Connection | High Voltage Warning Signs |
Customization Optional
500kVA Single Phase Pad Mounted Transformer
NPC ELECTRIC’s single-phase pad-mounted transformers can be fully customized to meet your specific requirements. The 500kVA single-phase pad-mounted transformer has a rich range of optional specifications. In terms of voltage, the primary input voltage can be selected from a variety of common voltage levels such as 6.6kV, 11kV, and 22kV as needed, and the secondary output voltage has different standards such as 230V, 400V, and 480V to adapt to different power-consuming equipment and power grid requirements. In terms of tap changers, there are two options: off-excitation tap changers and on-load tap changers. On-load tap changers can adjust the voltage without shutting down the transformer, which can cope with frequent load changes; off-excitation tap changers are suitable for relatively stable voltage conditions.
In terms of insulation system, A-class, F-class or H-class insulation materials can be selected. Among them, H-class insulation allows higher winding temperature, which can improve the overload capacity and service life of the transformer. The oil tank material can be selected from ordinary carbon steel or stainless steel. Stainless steel has better corrosion resistance and is suitable for installation in coastal areas or chemical industries with high corrosion risks.
Packing and Shipping
500kVA Single Phase Pad Mounted Transformer
NPC ELECTRIC three-phase transformers are designed to be securely packaged for sea freight transport, ensuring safe delivery across long distances.
For this purpose, The packing and shipping of a 500kVA Single Phase Pad Mounted Transformer are carried out with careful attention to safety and protection during transit. The transformer is typically packaged in a robust, weather-resistant wooden crate or metal frame, ensuring it is shielded from external environmental factors like moisture, dust, and physical impact. Protective padding is added around sensitive components, such as bushings and electrical connections, to prevent any damage during handling.
For transportation, the transformer is securely fastened onto a flatbed truck or container, depending on its size and destination. It is firmly strapped down to avoid any shifting during transit, and the package is often marked with handling instructions to ensure proper care during loading and unloading. In cases of international shipping, the transformer may be placed inside a sealed container with necessary customs documentation.
The packing and shipping process ensures that the 500kVA transformer arrives safely at its destination, ready for installation and use, while maintaining compliance with relevant safety and quality standards.
Additionally, all transportation methods comply with safety regulations, ensuring the transformer reaches its destination in optimal condition.
32
32 years of industry experience
Manufacturer Test
500kVA Single Phase Pad Mounted Transformer
Progress Test
NPC Electric manufacture pad mounted transformer have the strict quality control. The Progress Test for a 500kVA Single Phase Pad Mounted Transformer is a set of inspections and performance tests conducted at different stages of the manufacturing process to ensure the transformer meets all design specifications and quality standards. These tests typically include verifying electrical parameters such as voltage ratios, insulation resistance, and load testing to ensure the transformer operates efficiently under both no-load and full-load conditions. The mechanical integrity of the transformer is also assessed, checking for proper assembly of components like bushings, connectors, and the enclosure. Additional tests may include partial discharge testing, temperature rise tests, and dielectric strength evaluations to ensure safe and reliable operation. The Progress Test ensures that the transformer is fully functional, safe, and ready for the final Factory Acceptance Test (FAT) before shipment.
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
NPC Electric will tests made for quality control by the manufacturer on every device or representative samples, or on parts or materials as required, to verify during production that the product meets the design specifications.
The Transformer Factory Acceptance Test (FAT) for a 500kVA Single Phase Pad Mounted Transformer is a critical series of inspections and performance checks performed at the manufacturer's facility to ensure the transformer meets all technical specifications, safety standards, and regulatory requirements before it is shipped. The FAT typically includes electrical tests, such as verifying voltage ratios, checking insulation resistance, and performing load and no-load tests to assess the transformer's performance. Additionally, mechanical checks are conducted to verify the integrity of components like the enclosure, bushings, and connections. Other tests, including temperature rise tests, dielectric strength, and partial discharge testing, are performed to ensure the transformer operates reliably and safely under real-world conditions. The FAT confirms that the transformer is fully functional and ready for installation, providing assurance of its quality and reliability.
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.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Utility, Residential areas, Commercial hubs, Transportation centers, Airports, industrial facilities
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
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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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