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Premium Pad-Mounted Transformer Solutions for U.S. Utility & Industrial Infrastructure

UL Listed | IEEE/ANSI Compliant | Rapid Lead Times for Custom & Standard Configurations.

QXG has been specializing in Three Phase Pad Mounted transformer, Single Phase Pad Mounted Transformer, Substation Transformer and other types transformer for more than 15 years.  With UL, CUL, CE certificates and professional in IEEE, CSA, DOE, ANSI standards. QXG has a strong production capacity and highly automated production lines cable of producing  over 20,000 transformer annually.
Transformer: Capacity up to 10,000 kVA, Voltage up to 44 KV.
Short delivery time: 4-8 weeks, depending on your quantity.
Testing: Support online and offline viewing of transformer testing experiments, and conduct real-time and transparent quality inspections of transformers.
Experience in the US and Canada Market: One-stop transformer solution for the US and Canada Market.
Comprehensive after-sales service: QXG has professional after-sales and maintenance department to solve all possible problems that may arise at any time.

Transformer

Three Phase Pad Mounted Transformer
Three Phase Pad Mounted Transformer
Loop Feed vs. Radial Feed for Pad-Mounted Transformers Loop Feed Configuration: Features bidirectional connectivity, typically equipped with 2–3 high-voltage interface ports. Supports closed-loop operation or open-loop switching. In the event of a fault on a section of the line, power continuity can be maintained through network switching. Radial Feed Configuration: The high-voltage side usually has only one incoming interface. The low-voltage side has a fixed outgoing circuit and does not support radial feed switching.
Single Phase Pad Mounted Transformer
Single Phase Pad Mounted Transformer
QXG designs and manufactures single-phase pad-mounted transformers (15–250 kVA) for outdoor installation with lockable cabinets, featuring ONAN/KNAN cooling. Available in radial or loop feed configuration, with aluminum or copper windings. Optimized for energy efficiency and compact size. Fully compliant with ANSI, IEEE, DOE, CSA, and NEMA standards. Customized solutions available.
Substation Transformer
Substation Transformer
QXG substation transformers feature a sealed structure and high-quality materials, making them suitable for harsh environments such as high-altitude and humid coastal areas, with customized services available to meet IEEE, CSA, DOE, and ANSI standards. Key specifications include rated capacity up to 10,000 kVA, voltage up to 69 kV, cooling options of ONAN/KNAN/ONAF/KNAF, winding materials of copper or aluminum, and tank materials of mild steel or stainless steel.

Specifications

Production Name Three Phase Pad Mounted Transformer Single Phase Pad Mounted Transformer Substation Transformer
Standard IEEE, CSA, DOE, ANSI IEEE, CSA, DOE, ANSI IEEE, CSA, DOE, ANSI
Type Loop Feed/ Radial Feed Loop Feed/ Radial Feed
Rated capacity <=10,000 kVA <=250 kVA 120 MVA and below
Input voltage <= 34.5 kV <= 34.5 kV <= 69 kV
Output voltage 208y-13800 V 120-600 V <= 34.5 kV
Frequency 50/60Hz 50/60Hz 50/60Hz
Winding material Copper/Aluminum Copper/Aluminum Copper/Aluminum
Iron Core Silicon steel grain oriented core Silicon steel grain oriented core Silicon steel grain oriented core
Cooling ONAN/KNAN/ONAF/KNAF ONAN/KNAN ONAN/KNAN/ONAF/KNAF
Tank Stainless steel/ Mild steel Stainless steel/ Mild steel Stainless steel/ Mild steel

QXG Service

UL, CUL, ISO certificates: As a reputable manufacturer and supplier of pad mounted transformers, QXG has earned wide trust in the industry through consistent quality and reliable service. Its product portfolio carries UL/CUL and ISO certifications, which serve as strong endorsements of compliance with rigorous safety, performance, and operational standards in North American markets.

US standard and Canada standard transformer: Pad mounted transformers in the North American market need to comply with the regional standards of both the United States and Canada. There are differences in the adherence to production standards between the two.

Offer various types of transformers: American standard follows IEEE/ANSI and DOE standards. From the exterior, the high and low voltage rooms are separated by a barrier; Canadian standard follows the CSA standard. From the appearance, there is no barriei to separate the high and low voltage rooms.

Offer various types of high voltage bushings: There are two main types of bushings used in padmount transformers – live front and dead front bushings. With live front, a part of the conductor is exposed, whereas with dead front, the conductor is completely enclosed inside an effective insulating material such as epoxy, EPDM rubber, and/or nylon resin.

Accessories: QXG can provide international brands such as Cooper and Chardon according to customer requirements.

Iron core: QXG offers three leg and five leg iron cores to meet the different transformer requirements of customers.

Testing: QXG offers both online and offline testing services, enabling customers to have a more direct view of the testing process. Each transformer of QXG undergoes strict testing to ensure that its performance meets the international standards required by various customers.

Packing: Plastic film, foam, pallets and wooden boxes can be provided according to the customer’s packaging requirements for packing, ensuring that the transformers are safely delivered to the destination.

Pre-sale and after-sale services: QXG offer one-stop transformer solution service, provide the quotation within 1-2 days, save you energy and time. QXG has a professional after-sales and maintenance department to solve all possible problems that may arise at any time.

Pad Mounted Transformer Advantages

Transformer: Capacity up to 10,000 kVA, Voltage up to 44 KV.
Types: Loop feed configuration or Radial feed configuration.
Transformer oil tank: The exterior paint of the QXG transformer oil tank is made of anti-corrosion coating to protect the transformer from the erosion of harsh environments.
High Quality: The QXG pad mounted transformer is certified with UL/CUL certificates, and complies with international production standards such as IEEE, CSA, DOE and ANSI.
Production capacity: QXG has an automated production line, which enables it to quickly meet customers’ large-scale orders and short-term delivery requirements. It produces 20,000 transformers annually.
High stability and reliability: The transformer can accurately adjust the voltage according to the operation requirements of the mining machine to ensure that each mining machine can operate stably under the appropriate voltage environment, avoid the damage of the mining machine or the decline of the computing power due to too high or too low voltage, and provide a solid power foundation for the continuous mining of Bitcoin.

Substation Transformer Advantages

Transformer: Capacity up to 10,000 kVA, Voltage up to 69 KV.
Transformer Design: The transformer is designed with a compact sealed box structure, enabling it to be installed in harsh environments.
Insulating oil: Insulating oil is poured into the interior of the transformer to effectively ensure insulation performance and extend the service life of the transformer.
Accessories: QXG offers Cooper, Chardon and other Chinese brand accessories. Substation transformer is equipped with a monitoring and alarm system to ensure that the transformer can supply power safely and stably.
Anti-theft and anti-tampering function: The control box is fixed with bolts, and the oil discharge valve is equipped with an outer protective box design to prevent theft.
Fuel tank protection: When the winding temperature exceeds 60 ℃, the fan will automatically start to cool down. When the internal oil temperature of the fuel tank exceeds 85 ℃, the oil level indicator will activate the alarm device to give a warning.
Low loss: Efficient transformers can reduce the energy loss in the power conversion process, reduce the operating costs of the mine, and improve the overall mining efficiency.

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Application

The core pain points of Bitcoin mining lie in the significant fluctuations in load, the scattered locations of the sites, and the strict requirements for continuous operation: each mining facility typically deploys thousands of mining machines and operates at full capacity 24 hours a day; moreover, the mining facilities may be located in industrial parks, remote factories, or even outdoor areas, with complex power access conditions. The flexible power supply capability of the pad mounted transformer becomes indispensable in this scenario – its modular design supports multiple circuit outputs, allowing for flexible distribution of power based on the grouped deployment of the mining machine clusters (for example, a single transformer can simultaneously supply power to 3-5 mining machine cabinets), and it can achieve dynamic load regulation through a ring network structure to avoid overall power outages caused by overloading of a certain group of mining machines.

Bitcoin Mining

The core demands of the utility scenario lie in accommodating diverse loads and ensuring overall power supply: The electricity load in residential communities fluctuates with the day-night cycle (such as the use of air conditioners during the morning rush hour and household appliances during the evening rush hour), commercial buildings need to stably support high-power equipment like elevators and central air conditioning, while small industrial parks face the challenge of intermittent peak load from welding machines and air compressors. The QXG single phase pad mounted transformer, with its flexible load adaptation capability, covers a rated power range of 15-250 kVA and can precisely match the needs of different scenarios.

Utility

In AI data center scenarios such as cryptocurrency mining, equipment clusters (such as thousands of mining machines) need to operate at full capacity 24 hours a day. The power demand for a single site can often reach several megawatts, and there are strict requirements for power supply continuity and stability. The QXG substation transformer, with its precise load matching capability, adopts a modular multi-circuit output design (allowing a single device to independently power 8-12 sets of mining machine cabinets simultaneously), which can dynamically balance the load in each area and prevent cascading power outages caused by sudden overload of a certain group of devices.

AI Data Center

FAQ

Do your products have any international certifications?

We have UL and CUL certifications, which attest to the safety and quality of our products, especially for the North American market. We also hold CE, ISO, and other reliable certificates.

Can QXG provide overseas brand accessories in transformers?

Yes, we can provide overseas brand accessories. For the bushing, we normally use CHARDON and COOPER; For the fuse, mostly we use EATON; For the gauges and other accessories, we can provide both Chinese domestic and overseas brand, such as QUALITROL, EATON, H-J…

Do you offer OEM services for transformers?​

Yes, we provide professional OEM services. Whether you have a unique design concept or specific performance requirements, our team is ready to work with you. We can manufacture transformers according to your specifications, including customizing the appearance, performance parameters, and packaging.

How long does it usually take to receive the transformers after placing an order?​

Generally, for standard transformers, we can finish production within 4 to 8 weeks, the ideal delivery time (contains shipping) could be 12 weeks. The actual delivery time depends on the complexity and quantity of the order, and the location of receiver.

How long is QXG warranty period?

We offer a two-year warranty on all transformers. During this period, if you encounter any problems related to product quality and installation, our team will actively cooperate with inspection, repair and provide online and offline installation services.

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