750kVA Three Phase Pad Mounted Transformer
The 750kVA three-phase pad transformer is an efficient and durable power equipment designed for commercial, industrial and distribution system applications. The transformer supports a variety of voltage configurations to meet the power needs of different regions, and is equipped with advanced protection systems such as overload protection, short-circuit protection and temperature control devices to ensure the safe operation of the equipment under high load and extreme environments.
- 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, DOE, CSA
- Application ESS, Bitcoin mining, Industry, Renewable energy, EV charging, Utility
- Power Rating 750kVA
- Certificate UL, cUL, CSA, SGS
- 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
750kVA Three Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 750 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 | 1300 kg |
| Total Weight | 3900 kg |
| Outline Dimensions（L×W×H）in. | 1700×600×1850（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
750kVA 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 750kVA Three-Phase Pad Mounted Transformer provide flexibility to meet specific operational and environmental requirements. These options include customizable voltage ratings such as 13.8kV/480V, 11kV/415V, or other configurations to suit different power distribution needs.
The transformer can be equipped with various enclosure types, including NEMA 3R, NEMA 4, or IP55-rated enclosures, ensuring it can withstand harsh outdoor conditions.
The optional specifications for the 750kVA Three-Phase Pad Mounted Transformer provide flexibility to meet specific operational and environmental requirements. These options include customizable voltage ratings such as 13.8kV/480V, 11kV/415V, or other configurations to suit different power distribution needs.
The transformer can be equipped with various enclosure types, including NEMA 3R, NEMA 4, or IP55-rated enclosures, ensuring it can withstand harsh outdoor conditions.
Additional options include multiple tap configurations for voltage regulation, advanced cooling systems like forced air or oil cooling for better thermal management, and enhanced protection features, including overcurrent, surge protection, and temperature monitoring systems. These optional specifications allow for a tailored solution that ensures optimal performance, safety, and reliability for different application environments.
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.
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
750kVA 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 packing and shipping standards for the 750kVA Three-Phase Pad Mounted Transformer are designed to ensure safe and secure transportation, meeting both domestic and international shipping requirements.
Packaging:
1.The transformer is securely mounted on a durable wooden pallet or skid, preventing any movement during transit and ensuring stability.
2.It is wrapped in moisture-resistant plastic or shrink-wrap to protect it from dust, dirt, and environmental factors like humidity.
3.The transformer is placed in a reinforced wooden crate or metal container, providing additional protection against external shocks, impacts, and rough handling.
4.Proper labeling, including weight, dimensions, and handling instructions, is applied for easy identification and efficient handling.
Shipping:
1.The transformer is shipped using suitable modes of transportation, including flatbed trucks, shipping containers for ocean freight, or air freight, depending on the destination.
2.The packaging is designed to meet international shipping standards, ensuring compliance with regulations for secure transportation by sea, air, or land.
3.Additional export crating is used for long-distance shipments to ensure the transformer remains secure during transit.
4.The package is designed to withstand potential rough handling, ensuring that the transformer arrives at the destination safely, ready for installation.
These packing and shipping standards are in place to minimize the risk of damage during transit, ensuring that the transformer reaches its destination in optimal condition.
Packaging:
1.The transformer is securely mounted on a durable wooden pallet or skid, preventing any movement during transit and ensuring stability.
2.It is wrapped in moisture-resistant plastic or shrink-wrap to protect it from dust, dirt, and environmental factors like humidity.
3.The transformer is placed in a reinforced wooden crate or metal container, providing additional protection against external shocks, impacts, and rough handling.
4.Proper labeling, including weight, dimensions, and handling instructions, is applied for easy identification and efficient handling.
Shipping:
1.The transformer is shipped using suitable modes of transportation, including flatbed trucks, shipping containers for ocean freight, or air freight, depending on the destination.
2.The packaging is designed to meet international shipping standards, ensuring compliance with regulations for secure transportation by sea, air, or land.
3.Additional export crating is used for long-distance shipments to ensure the transformer remains secure during transit.
4.The package is designed to withstand potential rough handling, ensuring that the transformer arrives at the destination safely, ready for installation.
These packing and shipping standards are in place to minimize the risk of damage during transit, ensuring that the transformer reaches its destination in optimal condition.
32
32 years of industry experience
Manufacturer Test
750kVA Three Phase Pad Mounted Transformer
Progress test
NPC Electirc manufacture pad mounted transformer have the strict quality control .
The progress test for the 750kVA Three-Phase Pad Mounted Transformer is conducted at various stages during the manufacturing process to ensure that the transformer meets all design specifications and quality standards.
These progress tests help identify and address any potential issues early in the manufacturing process, ensuring that the transformer meets performance and safety standards before moving on to 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
The Transformer Factory Acceptance Test (FAT) for the 750kVA Three-Phase Pad Mounted Transformer is a comprehensive evaluation conducted at the manufacturer’s facility to ensure the transformer meets all technical specifications and quality standards before shipment. Once all tests are successfully completed, the transformer is certified for shipment, assuring the customer that it will perform safely and reliably throughout its service life.
Routine Test - No Load Loss Test
Purpose of Testing
The purpose of No Load Loss Test is to measure the power loss of the equipment when it is not loaded to evaluate the iron loss and other core losses. This test can help understand the energy efficiency of the equipment and help determine the performance of the transformer or motor when it is running at no load.
Testing Equipment
No Load Loss tester (e.g. OMICRON, Megger, Schneider Electric, etc.)
Voltage source (usually 230V, 400V or customized according to customer requirements to adapt to different equipment)
Power analyzer (used to measure power loss and efficiency)
Ammeter and voltmeter
Temperature and humidity meter
Voltage source (usually 230V, 400V or customized according to customer requirements to adapt to different equipment)
Power analyzer (used to measure power loss and efficiency)
Ammeter and voltmeter
Temperature and humidity meter
Pre-Test Preparation
Disconnect the power supply of the device and ensure that the device is properly grounded and discharged to ensure safe operation.
Please ensure that the test is carried out in a suitable environment with a relative humidity of less than 75% and avoid rainy days or extreme weather (recommended temperature range: 20-30°C).
Please ensure that the test is carried out in a suitable environment with a relative humidity of less than 75% and avoid rainy days or extreme weather (recommended temperature range: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test equipment to the high voltage side of the transformer, making sure the wiring is correct and the equipment is grounded.
Apply Test Voltage:
Usually it is 110% of the rated voltage, for example, if the rated voltage of the transformer is 33 KV, apply 36.3 KV (110%).
Connect the test equipment to the high voltage side of the transformer, making sure the wiring is correct and the equipment is grounded.
Apply Test Voltage:
Usually it is 110% of the rated voltage, for example, if the rated voltage of the transformer is 33 KV, apply 36.3 KV (110%).
Measure and Record
Start the test and record the following parameters:
No Load Current
No Load Loss
Power Factor
Current
Voltage
Temperature and Humidity
No Load Current
No Load Loss
Power Factor
Current
Voltage
Temperature and Humidity
Temperature Correction
The power loss of the test results is corrected to a reference temperature (usually 20°C) to ensure an accurate evaluation.
Repeat Testing (if necessary)
Test at different rated voltages, especially when the transformer has multiple capacity levels, and perform no-load loss tests for each capacity level separately.
Evaluation Criteria (Reference)
o-load loss ≤ 0.2% rated power (excellent)
No-load loss < 0.2% ≤ 0.5% rated power (good)
No-load loss > 0.5% rated power (further inspection or corrective action required)
No-load loss < 0.2% ≤ 0.5% rated power (good)
No-load loss > 0.5% rated power (further inspection or corrective action required)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
ESS, 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
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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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