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500kVA Dry type transformer4
500kVA Dry type transformer
500kVA Dry type transformer 2
500kVA Dry type transformer 3
500kVA Dry type transformer4
500kVA Dry type transformer
500kVA Dry type transformer 2
500kVA Dry type transformer 3

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.
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 Industrial equipment power distribution, commercial buildings, residential power distribution, power systems and distribution networks etc
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
  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
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.

Packing and Shipping

500kVA Dry Type Transformer
NPC ELECTRIC’s dry-type transformers are meticulously packaged for secure sea freight and long-distance transport, ensuring they arrive at their destination in perfect condition and ready for installation.
The 500kVA Dry-Type Transformer is carefully packed and shipped to ensure it arrives in optimal condition. The transformer is first securely wrapped with weather-resistant plastic to protect it from dust, moisture, and environmental factors during transport. It is then placed on a sturdy wooden pallet or in a custom-built wooden crate, providing additional support and protection against impact or movement during transit.
For further protection, foam padding or shock-absorbing materials are used to cushion the transformer. The unit is labeled with clear handling instructions and shipping marks, indicating its weight, dimensions, and any special requirements for lifting or unloading.
The transformer is shipped using reliable and reputable carriers, and the packaging is designed to meet international shipping standards to prevent damage during both land and sea transport.
Upon arrival, the packaging is removed, and the transformer is carefully inspected for any transit-related damage before installation.
500kVA Dry type transformer package
500kVA Dry type transformer package mini
32
32 years of industry experience

Manufacturer Test

500kVA Dry Type Transformer
500kVA Dry type transformer Progress Test

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.

500kVA Dry type transformer  Design Tests

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

China NPC ELECTRIC

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 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. 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 - 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)
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.
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).
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
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.
200kVA Dry type Transformer Routine Test

Application

Industrial equipment power distribution, commercial buildings, residential power distribution, power systems and distribution networks etc

Technical Advantages

● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions

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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.

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