30kVA Oil Immersed Transformer
30kVA Oil Immersed Transformer, produced by a reputable manufacturer and supplier in China, represents the pinnacle of electrical engineering excellence. These transformers are engineered with precision and cutting-edge technology to provide robust, efficient, and long-lasting power solutions.
- 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, UL, ISO,IEC, GB
- Application Industrial Power Distribution, Commercial Buildings, Agriculture, Power Distribution Substations
- Power Rating 30kVA
- Certificate ISO, CE, UL, IEEE
- 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
30kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 30 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 | 54 kg | |
| Total Weight | 250 kg | |
| Outline Dimensions（L×W×H）in. | 740 × 560 × 845（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
30kVA Oil Immersed Transformer
NPC ELECTRIC’s three-phase Oil immersed transformers can be fully customized to meet your specific requirements. The 30kVA three-phase Oil immersed transformer offers a variety of optional specifications to meet specific operational needs. These options may include different types of insulating oils, such as mineral oil or FR3, for enhanced environmental compliance. The transformer can be equipped with on-load tap changers (OLTC) for adjusting output voltage under varying load conditions.
Additionally, DMCR Protection Relay for improved performance and safety. Protection features, such as surge arresters, pressure relief devices, can also be included for added reliability. For installations in harsh environments, corrosion-resistant coatings or weatherproof enclosures are available to ensure durability and longevity. These customizable specifications make the transformer suitable for a wide range of applications, offering flexibility, safety, and efficiency.
Packing and Shipping
30kVA Oil Immersed Transformer
NPC ELECTRIC transformers are designed to be securely packaged for sea freight transport, ensuring safe delivery across long distances. For this purpose, the Packing and Shipping process for a Transformer is designed to ensure safe delivery to the customer, minimizing the risk of damage during transit.
The transformer is securely packed in a robust, weather-resistant wooden crate or steel container, with appropriate cushioning materials like foam or bubble wrap to absorb any shocks or impacts during transport.
The packing is carefully designed to protect the transformer from moisture, dust, and other environmental factors that could potentially affect its functionality.
For shipping, the transformer is typically delivered via road, rail, or sea, depending on the destination. It is properly secured to the shipping platform or pallet using straps or tie-downs to prevent any movement during transit.
The packaging is clearly labeled with handling instructions and safety warnings to ensure that all involved parties handle the equipment with care.
Shipping documentation, including customs clearance forms, certificates of origin, and any necessary permits, is included to comply with international shipping standards. Upon arrival, the transformer is inspected for any potential damage before installation. This thorough packing and shipping process ensures that the Transformer reaches its destination in optimal condition, ready for installation and long-term operation.
The transformer is securely packed in a robust, weather-resistant wooden crate or steel container, with appropriate cushioning materials like foam or bubble wrap to absorb any shocks or impacts during transport.
The packing is carefully designed to protect the transformer from moisture, dust, and other environmental factors that could potentially affect its functionality.
For shipping, the transformer is typically delivered via road, rail, or sea, depending on the destination. It is properly secured to the shipping platform or pallet using straps or tie-downs to prevent any movement during transit.
The packaging is clearly labeled with handling instructions and safety warnings to ensure that all involved parties handle the equipment with care.
Shipping documentation, including customs clearance forms, certificates of origin, and any necessary permits, is included to comply with international shipping standards. Upon arrival, the transformer is inspected for any potential damage before installation. This thorough packing and shipping process ensures that the Transformer reaches its destination in optimal condition, ready for installation and long-term operation.
32
32 years of industry experience
Manufacturer Test
30kVA Oil Immersed Transformer
Progress Test
NPC Electirc manufacture three-phase Oil immersed transformers have the strict quality control , The Progress Test for a 30kVA three-phase Oil immersed transformers is carried out during the manufacturing process to ensure that the transformer meets all design and quality requirements. These tests include verification of the core insulation, winding resistance, and dielectric strength of the transformer. Additionally, electrical components such as bushings, tap changers, and protection devices are tested for proper functionality. The progress test also checks the transformer’s ability to handle operational loads and voltage fluctuations. Any issues identified during these tests are addressed before moving on to the final testing stages, ensuring that the transformer is reliable, safe, and ready for commissioning. These tests are essential to confirm the transformer’s performance under real-world conditions and compliance with industry standards.
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 30kVA three-phase Oil immersed transformers is an essential procedure conducted before shipment to ensure the transformer meets all required standards and performs optimally. During the FAT, several critical tests are carried out:
Visual Inspection: Ensuring the transformer’s physical appearance, including the enclosure, bushings, and labeling, meets design specifications.
Electrical Testing: This includes measuring winding resistance, insulation resistance, and verifying the turns ratio to confirm proper electrical functionality.
Dielectric Strength Test: Applying high voltage to the transformer to test its insulation system, ensuring it can withstand normal operating and transient voltage conditions.
Load Testing: Simulating real-world operational conditions to verify the transformer’s performance under load, checking voltage regulation and efficiency.
Protection Device Testing: Confirming that safety features such as surge arresters, tap changers, and other protective components function properly.
The FAT ensures the 30kVA three-phase Oil immersed transformers is reliable, safe, and ready for installation, guaranteeing compliance with industry standards before being dispatched to the customer.
Routine Test - Winding Resistance
Purpose of Testing
The purpose of winding resistance testing is to detect the continuity and connection quality of the internal conductors of the motor or transformer windings, and to promptly detect potential faults such as open circuits, poor contact or local heating.
Testing Equipment
Winding resistance tester (e.g. OMICRON, DV Power, Raytech, Megger, ISA, etc.)
Test voltage source (commonly used are 6V, 10V, 20V, 40V or 100V, depending on the equipment model or customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test)
Test voltage source (commonly used are 6V, 10V, 20V, 40V or 100V, depending on the equipment model or customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test)
Pre-Test Preparation
Check if the instrument has been calibrated to ensure the test accuracy.
Disconnect the electrical connection between the test cable and the equipment to ensure that there is no external current or voltage interference.
Select a suitable voltage range for testing and set the test voltage according to the equipment requirements.
Disconnect the electrical connection between the test cable and the equipment to ensure that there is no external current or voltage interference.
Select a suitable voltage range for testing and set the test voltage according to the equipment requirements.
Test Progress
Connect the Test Instrument:
Connect the test equipment to the winding terminals of the device under test, making sure the connections are secure and properly grounded to avoid measurement errors.
Apply Test Voltage:
Select the appropriate test current according to the equipment specifications (such as test current for low-voltage windings, single-phase or three-phase windings).
Connect the test equipment to the winding terminals of the device under test, making sure the connections are secure and properly grounded to avoid measurement errors.
Apply Test Voltage:
Select the appropriate test current according to the equipment specifications (such as test current for low-voltage windings, single-phase or three-phase windings).
Measure and Record
Start the test and record the following parameters:
Winding resistance (usually expressed in units of "Ω")
Test current (A)
Test voltage (V)
Temperature (record the winding temperature before and after the test)
Winding resistance (usually expressed in units of "Ω")
Test current (A)
Test voltage (V)
Temperature (record the winding temperature before and after the test)
Temperature Correction
The measured winding resistance values are converted to a reference temperature (usually 20°C) based on a temperature correction formula to allow accurate evaluation and comparison.
Repeat Testing (if necessary)
Test the different windings (high voltage, medium voltage, low voltage) separately and make sure to record the resistance value of each winding.
Evaluation Criteria (Reference)
Resistance deviation is less than 5% (normal)
Resistance deviation is between 5% and 10% (warning)
Resistance deviation exceeds 10% (further inspection or corrective action is required)
Resistance deviation is between 5% and 10% (warning)
Resistance deviation exceeds 10% (further inspection or corrective action is required)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Industrial Power Distribution, Commercial Buildings, Agriculture, Power Distribution Substations
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
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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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