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. Key characteristics feature three-phase design (single-phase adaptable), primary voltages 208V–600V (e.g., 480V Delta, 600V Delta), secondary voltages such as 208Y/120V, 480Y/277V, or custom, aluminum or copper windings, 150°C rise (standard) or 115°C/80°C with 220°C insulation class, ±2×2.5% primary taps, NEMA 1 ventilated enclosure (NEMA 3R/encapsulated options), natural convection cooling (AN), electrostatic shielding, and low sound levels per NEMA.
- 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
- Application power distribution, commercial buildings
- Power Rating 500kVA
- 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
500kVA Dry Type Transformer
Technical Specifications
Accessories
| 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 | |
| Enclosure material | 304 Stainless Steel | |
| Total Weight | 1860 kg | |
| Outline Dimensions（L×W×H）in. | 1560×1300×1850（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
500kVA Dry Type Transformer
The 500kVA Dry-Type Transformer offers reliable and efficient power distribution with a compact, oil-free design. Key features include advanced insulation for enhanced safety, low noise operation, and minimal maintenance. It is designed to operate efficiently in commercial and industrial settings, providing cost-effective and environmentally friendly performance with a 500kVA capacity. Select aluminum windings for balanced cost and efficiency or copper for premium conductivity, reduced losses, and superior thermal resilience. Temperature rise options offer 150°C (standard), 115°C, or 80°C to boost efficiency and extend insulation life under high ambient or continuous loads, utilizing 220°C or advanced class materials. Enclosure types include ventilated NEMA 1 for indoor dry conditions, NEMA 3R with weathershields for outdoor/humid exposure, or fully encapsulated for dust, moisture, corrosive, or hazardous classified zones. K-factor ratings (4, 9, 13, 20+) manage nonlinear loads from VFDs, data equipment, or lighting, while electrostatic shields minimize electrical noise and transients.
Enhancements feature forced-air fans for overload capacity, integrated primary/secondary breakers, surge arresters, digital temperature/monitoring sensors with alarms, SCADA interfaces, low-noise reductions, seismic bracing (OSHPD-compliant), 50/60Hz dual frequency, or impedance customization. All tailored designs undergo thorough engineering assessment to satisfy IEEE, ANSI, NEMA, UL, CSA, and DOE efficiency mandates (2029-amended with ~99.31% at 35% load for three-phase 500 kVA), minimizing no-load/load losses, optimizing impedance (typically 3-7%), enhancing safety, and lowering total ownership costs in high-demand or constrained spaces.
Packing and Shipping
500kVA Dry Type Transformer
The 500kVA dry type transformer is packaged with care to safeguard core, windings, enclosure, and accessories during global transport, capitalizing on its fluid-free construction for safer, simpler logistics. Post-testing, terminals insulate, taps align, enclosure secures, and unit cleans before wrapping.
Transformer secures to a reinforced wooden pallet or skid for forklift/jack handling, wrapped in heavy stretch film, VCI paper against corrosion, and foam/corner protectors for louvers, terminals, lifting eyes, and edges. Ventilated models employ breathable covers for air while blocking debris; encapsulated units feature added structural supports. Accessories (fans, weathershields, breakers) attach where feasible or crate separately with padding and identification.
Export packaging conforms to ISPM-15 heat-treated lumber, with steel strapping, edge reinforcements, and visible labels for weight (typically 4000-6000 lbs / 1814-2722 kg), center of gravity, lift points (eyebolts/brackets), dimensions (approx. 80-100" H x 60-80" W x 50-70" D), and cautions ("Fragile Electrical Equipment - No Tilting"). Tamper-evident seals protect doors; weatherproof covers shield connections. Domestic shipping uses enclosed trailers or flatbeds with secure tie-downs and blocking against vibration. International options include 20ft/40ft containers (palletized, shrink-wrapped), air cargo for urgent needs, or LCL, with professional lashing for motion resistance. GPS tracking monitors progress; full-value insurance protects against transit risks.
Delivery provides thorough instructions for safe lifting (designated points), site positioning with ventilation clearances, grounding, connection torque, and initial tests (insulation resistance, ratio). Customs facilitation includes invoices, packing lists, origin certificates, efficiency certifications, and test reports for efficient clearance. Optional pre-shipment third-party or witness inspections confirm condition. Logistics prioritize compliance, damage prevention, and arrival of a transformer set for rapid, dependable installation.
Transformer secures to a reinforced wooden pallet or skid for forklift/jack handling, wrapped in heavy stretch film, VCI paper against corrosion, and foam/corner protectors for louvers, terminals, lifting eyes, and edges. Ventilated models employ breathable covers for air while blocking debris; encapsulated units feature added structural supports. Accessories (fans, weathershields, breakers) attach where feasible or crate separately with padding and identification.
Export packaging conforms to ISPM-15 heat-treated lumber, with steel strapping, edge reinforcements, and visible labels for weight (typically 4000-6000 lbs / 1814-2722 kg), center of gravity, lift points (eyebolts/brackets), dimensions (approx. 80-100" H x 60-80" W x 50-70" D), and cautions ("Fragile Electrical Equipment - No Tilting"). Tamper-evident seals protect doors; weatherproof covers shield connections. Domestic shipping uses enclosed trailers or flatbeds with secure tie-downs and blocking against vibration. International options include 20ft/40ft containers (palletized, shrink-wrapped), air cargo for urgent needs, or LCL, with professional lashing for motion resistance. GPS tracking monitors progress; full-value insurance protects against transit risks.
Delivery provides thorough instructions for safe lifting (designated points), site positioning with ventilation clearances, grounding, connection torque, and initial tests (insulation resistance, ratio). Customs facilitation includes invoices, packing lists, origin certificates, efficiency certifications, and test reports for efficient clearance. Optional pre-shipment third-party or witness inspections confirm condition. Logistics prioritize compliance, damage prevention, and arrival of a transformer set for rapid, dependable installation.
32
32 years of industry experience
Manufacturer Test
500kVA Dry Type Transformer
Progress Test
NPC Electric manufactures high-quality three-phase dry-type transformers under strict quality control protocols. The 500kVA Dry-Type Transformer undergoes a comprehensive progress test to ensure it meets the highest quality and performance standards. This includes verifying key parameters such as voltage ratio, insulation resistance, and load testing under normal operating conditions. Additionally, the transformer is tested for temperature rise, ensuring efficient heat dissipation and safe operation. All tests are conducted in accordance with international standards, and the transformer is carefully inspected for compliance before delivery. These rigorous tests guarantee that the 500kVA Dry-Type Transformer operates reliably and efficiently in 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
The Factory Acceptance Test (FAT) for a 500kVA 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. Induced potential test at double frequency stresses inter-turn insulation with partial discharge monitoring. No-load loss/excitation current at rated voltage validates core efficiency against DOE 2029 levels (~99.31% at 35% load). Impedance/load loss at rated current determines percent Z, copper losses, and regulation. Optional heat run if witnessed verifies temperature rise limits. Sound level testing confirms NEMA compliance. Functional checks operate taps, fans (if equipped), and alarms. Certified reports with traceable calibration and optional customer witnessing document results, confirming exceptional efficiency, dielectric strength, safety, and readiness for reliable field service.
Routine Test - On load Loss Test
Purpose of Testing
The purpose of On-load Loss Test is to measure the active power loss of the transformer under rated voltage and rated load, evaluate its energy efficiency level and design compliance, and provide a basis for energy consumption calculation and performance optimization during operation.
Testing Equipment
Power transformer test system (e.g. OMICRON, ISA, Tettex, Vanguard, etc.)
Voltage source and current source (usually rated voltage, or adjusted according to the test standard, such as 10 KV, 20 KV, 35 KV, etc.)
Temperature and humidity meter (used to record ambient temperature and humidity for correction of test data)
Voltage source and current source (usually rated voltage, or adjusted according to the test standard, such as 10 KV, 20 KV, 35 KV, etc.)
Temperature and humidity meter (used to record ambient temperature and humidity for correction of test data)
Pre-Test Preparation
Disconnect the transformer high voltage, low voltage and neutral power supply to ensure that the equipment is properly grounded and safely discharged.
The test environment should be dry and rainless, with a relative humidity of less than 75% and a recommended temperature range of 20–30°C.
The test environment should be dry and rainless, with a relative humidity of less than 75% and a recommended temperature range of 20–30°C.
Test Progress
Connect the Test Instrument:
Connect the test equipment to the appropriate terminals of the device under test and ensure that all wiring is correct and the device is well grounded.
Apply Test Voltage:
Apply the specified test voltage at the rated frequency and adjust the low voltage side to maintain the rated current (or specified current).
Connect the test equipment to the appropriate terminals of the device under test and ensure that all wiring is correct and the device is well grounded.
Apply Test Voltage:
Apply the specified test voltage at the rated frequency and adjust the low voltage side to maintain the rated current (or specified current).
Measure and Record
Start the test and record the following parameters:
On-Load Loss Power
Input Power and Output Power
Current
Voltage
Temperature (temperature rise or winding temperature)
Ambient temperature and humidity during the test
On-Load Loss Power
Input Power and Output Power
Current
Voltage
Temperature (temperature rise or winding temperature)
Ambient temperature and humidity during the test
Temperature Correction
The measured loss data is corrected based on a reference temperature (usually 20°C) to ensure the accuracy of the results.
Repeat Testing (if necessary)
Test different tap positions (Tap Changer) and record and compare the load loss data of each tap point.
Evaluation Criteria (Reference)
Evaluate the test results based on the equipment type and manufacturer requirements. If the load losses are low and the efficiency is high, it is considered "normal". If the load losses are too high or the efficiency is low, further inspection or corrective action is required.
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
Suited for substantial commercial facilities, office towers, retail malls, schools, and hospitals requiring robust indoor power distribution without fluid risks. Also fits industrial plants, workshops, and manufacturing areas with significant loads, delivering efficient 480V to 208Y/120V transformation, low noise, and fire-safe reliability in high-traffic or ventilated zones.
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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