300kVA Three Phase Pad Mounted Transformer
The 300kVA three-phase pad transformer is an efficient and reliable power device designed for commercial, industrial and distribution systems. The transformer provides a high power capacity of 300kVA, which can provide a stable three-phase power supply for high-load equipment, ensuring efficient and smooth operation of the power system. Its sturdy housing adopts a protective design that meets the NEMA 3R standard, which can effectively resist the invasion of the external environment and is suitable for outdoor installation.
- 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 208GrdY/120;416GrdY/240 or 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, DOE
- Application Construction, BESS, Bitcoin mining, Industry, Renewable energy, EV charging, Utility
- Power Rating 300kVA
- Certificate UL , cUL, CSA
- 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
300kVA Three Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 300 kVA |
| Rating Primary Voltage | 4.16-34.5kV or customized |
| Secondary Voltage | 480GrdY/277 208GrdY/120 400GrdY/230 Customized（208Y/120 V to 4,160 V） |
| Frequency | 50/60Hz |
| Vector Group | Dyn1/Yyn0/Dyn11/Dyn5 |
| Winding Material | Aluminum/Copper |
| Efficiency | As IEEE,Doe 2016,CAS Std or Customized |
| Impedance Voltage | Nominal 3.5% 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 | 900 L |
| Total Weight | 2600 kg |
| Outline Dimensions（L×W×H）in. | 1480×1250×1750 （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(15kV) | Ground Strap |
| Grounding Copper Bar | Nameplate |
| 1"'Drain Valve With 3/8" Sampler | IR Window |
| 1" Upper Fill Valve Filter Press Connection | Terminal Box |
| Non-PCB decal | High Voltage Warning Signs |
Customization Optional
300kVA Three Phase Pad Mounted Transformer
NPC ELECTRIC transformers offer pad mounted transformer a wide range of optional features to meet the diverse needs of electrical systems.
The optional specifications for the 300kVA Three-Phase Pad Mounted Transformer offer flexibility to meet various operational needs and environmental conditions. These options include customizable voltage ratings, such as 12kV/480V or 13.8kV/480V, to match specific power distribution requirements.
The transformer can also be equipped with different protection classes, such as NEMA 3R or IP55, for enhanced weatherproofing and durability in outdoor environments. Additional options may include multiple tap configurations for voltage regulation, advanced cooling methods like forced air or oil cooling, and optional monitoring systems for real-time performance tracking.
The optional specifications for the 300kVA Three-Phase Pad Mounted Transformer offer flexibility to meet various operational needs and environmental conditions. These options include customizable voltage ratings, such as 12kV/480V or 13.8kV/480V, to match specific power distribution requirements.
The transformer can also be equipped with different protection classes, such as NEMA 3R or IP55, for enhanced weatherproofing and durability in outdoor environments. Additional options may include multiple tap configurations for voltage regulation, advanced cooling methods like forced air or oil cooling, and optional monitoring systems for real-time performance tracking.
The transformer can also be fitted with various protection devices, such as overcurrent protection, pressure relief valves, and temperature monitoring to ensure safe operation.
For harsh environments, corrosion-resistant coatings and noise-reduction designs can be selected to further enhance performance and reliability. These optional specifications allow the transformer to be tailored to specific customer needs and application requirements.
With these flexible options, we ensure that our transformers can be customized for specific applications, environments, and safety standards, offering long-term reliability and performance.
For harsh environments, corrosion-resistant coatings and noise-reduction designs can be selected to further enhance performance and reliability. These optional specifications allow the transformer to be tailored to specific customer needs and application requirements.
With these flexible options, we ensure that our transformers can be customized for specific applications, environments, and safety standards, offering long-term reliability and performance.
Packing and Shipping
300kVA Three 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 300kVA Three-Phase Pad Mounted Transformer is carefully packed and prepared for shipping to ensure safe transportation and delivery. The transformer is securely placed on a sturdy wooden pallet or skid to prevent any movement during transit. It is then wrapped in weather-resistant plastic or shrink-wrap to protect it from moisture, dust, and debris, especially for long-distance or international shipments. For added protection, the transformer may be enclosed in a reinforced wooden crate or container to withstand external impacts and ensure safe handling.
The packaging is designed to meet international shipping standards and is suitable for air or ocean freight. Detailed labeling, including weight, dimensions, and handling instructions, is provided for easy identification and efficient handling during transportation. Depending on the destination, the transformer is typically shipped via flatbed truck or in a shipping container. The packaging ensures that the transformer arrives in optimal condition, ready for installation and use upon arrival.
The packaging is designed to meet international shipping standards and is suitable for air or ocean freight. Detailed labeling, including weight, dimensions, and handling instructions, is provided for easy identification and efficient handling during transportation. Depending on the destination, the transformer is typically shipped via flatbed truck or in a shipping container. The packaging ensures that the transformer arrives in optimal condition, ready for installation and use upon arrival.
32
32 years of industry experience
Manufacturer Test
300kVA Three Phase Pad Mounted Transformer
Progress test
NPC Electric manufacture pad mounted transformer have the strict quality control. The progress test for the 300kVA Three-Phase Pad Mounted Transformer is conducted during the manufacturing process to ensure that the transformer meets design specifications and quality standards. These tests are carried out at various stages of production and include:
Winding Resistance Test: Verifying the electrical integrity of the transformer windings.
Insulation Resistance Test: Ensuring that the insulation materials can withstand the required voltage levels without leakage.
Dielectric Strength Test: Testing the transformer's ability to handle high voltage without failure.
Temperature Rise Test: Monitoring the transformer’s temperature under load conditions to ensure it does not exceed safe operational limits.
Functional Testing: Ensuring that all protection devices, such as overload and short-circuit protection, are functioning properly.
These tests help identify and address any potential issues during the manufacturing process, ensuring the transformer performs reliably and safely before the final Factory Acceptance Test (FAT).
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 has strict control over testing.
The Transformer Factory Acceptance Test (FAT) for the 300kVA Three-Phase Pad Mounted Transformer is a comprehensive process carried out before the transformer is shipped to ensure it meets all required specifications and standards. The FAT includes several key tests:
1.Dielectric Test: Verifying the insulation’s ability to withstand high voltage without failure.
2.Temperature Rise Test: Ensuring the transformer operates within safe temperature limits under full load conditions.
3.Winding Resistance Test: Checking the resistance of the windings to ensure proper electrical conductivity.
4.Load Test: Confirming the transformer can handle the rated load and voltage without performance issues.
5.Functional Tests: Ensuring that all protective features, such as overload, short-circuit, and grounding protection, work effectively.
6.Visual and Mechanical Inspection: Inspecting the transformer for any physical damage, defects, or missing components.
Once the FAT is successfully completed, the transformer is certified to meet all safety, operational, and performance standards, and is cleared for shipment to the customer. This ensures the transformer will function reliably and safely throughout its service life.
Routine Test - Excitation & No-Load Loss (Rated Voltage)
Purpose of Testing
The purpose of testing Excitation & No-Load Loss at rated voltage is to assess the transformer's core loss and magnetizing current under normal operating conditions, ensuring efficient performance and identifying any potential issues in the core or windings. This test helps verify that the transformer operates within specified parameters and meets its design requirements.
Testing Equipment
Test equipment: Excitation Test instrument (such as OMICRON, Megger, etc.)
Voltage source: usually rated voltage (such as 230V, 400V, 660V, customized according to equipment requirements)
Temperature and humidity meter: used to record ambient temperature and humidity conditions
Voltage source: usually rated voltage (such as 230V, 400V, 660V, customized according to equipment requirements)
Temperature and humidity meter: used to record ambient temperature and humidity conditions
Pre-Test Preparation
Disconnect and make sure the device is powered off and properly grounded and discharged.
Check the device terminals and wiring to ensure that the connection is secure and not loose or contaminated.
Ensure the test environment is suitable: relative humidity below 75%, no rain, and recommended temperature is 20-30°C.
Check the device terminals and wiring to ensure that the connection is secure and not loose or contaminated.
Ensure the test environment is suitable: relative humidity below 75%, no rain, and recommended temperature is 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 connection points are properly grounded to avoid current leakage during the test.
Apply Test Voltage:
Select a suitable test voltage according to the rated voltage of the equipment (for example, the rated voltage is 11kV, 33kV or others), and ensure that the applied voltage is stable.
Connect the test equipment to the appropriate terminals of the device under test and ensure that all connection points are properly grounded to avoid current leakage during the test.
Apply Test Voltage:
Select a suitable test voltage according to the rated voltage of the equipment (for example, the rated voltage is 11kV, 33kV or others), and ensure that the applied voltage is stable.
Measure and Record
No-load current
No-load loss
Excitation loss
Power factor
Voltage
Current
Ambient temperature and humidity during testing
No-load loss
Excitation loss
Power factor
Voltage
Current
Ambient temperature and humidity during testing
Temperature Correction
The measured loss values and currents are corrected to a reference temperature (typically 20°C) for an accurate evaluation.
Repeat Testing (if necessary)
If necessary, measure the no-load loss and excitation loss of different windings (high voltage, medium voltage, low voltage) and at different voltage levels for comparative analysis.
Evaluation Criteria (Reference)
No-load loss ≤ rated loss (meets specifications)
No-load loss > rated loss (further inspection or corrective action required)
No-load loss > rated loss (further inspection or corrective action required)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Construction, BESS, Bitcoin mining, Industry, Renewable energy, EV charging, Utility
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
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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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