150 kVA Ansi Transformer-24.94/0.208 kV | USA 2024

Power at the Point of Need: Our Pad-Mounted Transformer. 

01 General

1.1 Project Description

150 kVA three phase pad mounted transformer was delivered to Canada in 2025. The rated power of the transformer is 150 kVA with KNAN cooling. The high voltage is 24.94GRDY/14.4 kV with ±2*2.5% tapping range (NLTC), the low voltage is 0.208GrdY/0.12 kV, they formed a vector group of YNyn0.

Our advanced Pad-Mounted Transformer represents a significant leap forward in reliable and eco-conscious distribution power technology. Designed for superior performance and longevity, this unit is the optimal choice for modern utility applications where safety and sustainability are paramount.

This ansi transformer is filled with FR3™ natural ester dielectric fluid. This high-performance oil, derived from renewable vegetable seeds, provides exceptional fire safety (high fire point of >360°C), is readily biodegradable, and offers superior moisture tolerance and thermal performance. This extends the insulation’s life and directly contributes to the transformer’s extended operational lifespan. Further enhancing its durability is the integration of a non-hygroscopic (moisture-resistant) barrier within the insulation system. To provide absolute peace of mind, this unit proudly carries a “Non-PCB” label. This certification guarantees that the transformer is free from Polychlorinated Biphenyls, harmful chemicals once used in older equipment. This commitment to safety protects both your personnel and the environment.

1.2 Technical Specification

150 kVA ansi transformer specifications type and data sheet

1.3 Drawings

150 kVA ansi transformer diagram drawing and size.

02 Manufacturing

2.1 Core

This 150kVA ansi transformer features a three-phase, five-limb core design. This configuration consists of three main vertical limbs, each wound with a phase winding, and two additional vertical limbs (outer yokes) that provide a closed, symmetrical magnetic path. This design offers a low-reluctance return path for harmonic fluxes, effectively reducing core losses and magnetizing current, while also promoting a more sinusoidal output waveform for improved performance and efficiency.

2.2 Winding

This ansi transformer utilizes an aluminum foil low-voltage (LV) winding and an aluminum wire high-voltage (HV) winding. The LV winding is wound from aluminum foil, offering excellent mechanical strength under short-circuit conditions and efficient heat dissipation. The HV winding is layer-wound with insulated aluminum wire, providing the necessary electrical insulation and voltage endurance. This combination results in a cost-effective, reliable, and robust design.

2.3 Tank

The tank of this ansi transformer is constructed from corrosion-resistant carbon steel, featuring a fully sealed and welded design to ensure protection against moisture and environmental contaminants. Its compact structure is engineered for safety and durability, with integrated lifting points and provisions for cable access, facilitating easy installation and maintenance in outdoor utility applications.

2.4 Final Assembly

The final assembly of this 150kVA ansi transformer integrates the core and coil, housed within a sealed, corrosion-resistant steel tank, to form a compact and robust unit. Pre-wired and factory-tested, it includes installed high-voltage and low-voltage compartments, bushings, and accessories, ensuring a completely self-contained, ready-for-installation package designed for reliable outdoor performance.

03 Testing

This 150kVA ansi transformer undergoes comprehensive factory tests, including routine tests such as turns ratio, winding resistance, impedance voltage, no-load and load loss measurements, as well as dielectric tests (applied voltage and induced voltage withstand). Additionally, it has undergo special tests like partial discharge measurement to ensure compliance with standards and reliable performance in the field.

04 Packing and Shipping

4.1 Packing

The packaging process of the three-phase pad mounted transformer is as follows: First, place a layer of tin foil bag on the transformer tray, cover the transformer with the tin foil bag, put desiccant inside, then seal the tin foil bag while leaving an opening. Use a vacuum cleaner to extract the gas from the bag and seal the opening with a sealing machine. Next, add corner protectors (made of foam, plastic, or pressed cardboard) around the transformer and wrap it with protective film. Finally, package the transformer externally in a wooden box, which should be sprayed with forklift markings and center of gravity markings.

4.2 Shipping

Forklifts, operated by professional handlers, carefully lift the wooden box holding the 150kVA pad mounted transformer-ensuring alignment with the truck’s cargo area to avoid jolts-and load it securely onto a dedicated transport truck. The truck then travels along planned logistics routes to the designated Chinese port, adhering to road safety regulations and speed limits to maintain the stability of the cargo. Upon arriving at the port’s container yard, specialized lifting equipment transfers the wooden box from the truck into a standard shipping container, with padding added between the box and container walls if needed to prevent shifting during transit. Finally, the sealed container is stacked onto a cargo ship, which departs for the United States and sails across the ocean to deliver the container to the specified destination port.

05 Site And Summary

In summary, our 150kVA pad-mounted transformer is more than just a piece of electrical equipment; it is a reliable and efficient power distribution solution engineered for excellence. Combining robust construction, superior efficiency, and enhanced safety features, it is designed to deliver unwavering performance in the most demanding urban, commercial, and industrial applications.

Choosing this transformer means investing in long-term value, reduced total cost of ownership, and operational peace of mind. It represents our commitment to merging innovative engineering with practical, user-centric design.