125kVA Single Phase Oil Immersed Distribution Transformer

Guangbian 125kVA Single Phase Oil Immersed Distribution Transformer is engineered for stable power distribution, high operational efficiency, and long-term outdoor performance. As a professional 125kVA distribution transformer manufacturer in China, Guangbian provides durable transformer solutions for utility networks, rural electrification projects, industrial facilities, schools, hospitals, and renewable energy systems worldwide.

With more than 20 years of manufacturing experience, Zhejiang Guangbian Electric Power Technology Co., Ltd. specializes in producing high-quality transformers below 35kV, offering dependable power supply equipment to customers across Africa, Southeast Asia, the Middle East, Central Asia, and South America.

Why Choose Guangbian 125kVA Single Phase Oil Immersed Distribution Transformer?

Excellent Heat Dissipation Performance

Mineral insulating oil provides superior cooling capability, ensuring lower operating temperatures and extending transformer lifespan. The sealed oil-immersed structure also minimizes moisture intrusion and oxidation.

Designed for Harsh Outdoor Environments

This 125kVA oil immersed transformer is suitable for high-temperature, humid, dusty, and unstable grid environments. The rugged steel tank structure offers excellent corrosion resistance and mechanical strength for long-term outdoor installation.

Flexible Customization for Global Markets

Guangbian’s engineering team is experienced with international transformer standards and can customize:

● Voltage ratings

● Frequency (50Hz/60Hz)

● Vector groups

● Impedance requirements

● Enclosure coatings

● Protection accessories

This allows the 125kVA single phase distribution transformer to comply with different regional utility specifications and project requirements.

Fast Production & Reliable Delivery

Guangbian operates dedicated workshops for transformer core manufacturing, transformer winding, sheet metal casing fabrication, assembly, and testing. Integrated production management enables better quality control, cost efficiency, and shorter lead times for customized transformers.

Technical Specifications

Flexible Voltage Adjustment for 60Hz Power Networks

The Guangbian 125kVA Transformer is designed for North and Latin American 60Hz power systems, featuring 14.42/24.9Y kV high-voltage windings and 277/480V wye low-voltage output. Five tap positions provide ±5% voltage adjustment, helping maintain stable output in long-distance distribution lines and varying load conditions while protecting downstream equipment.

Low Impedance, Better Field Performance

With 2.32% short-circuit impedance, the 125kVA Transformer delivers stronger voltage stability under load. It reduces voltage drop during heavy starts, helping motors, elevators, and other high-inrush equipment operate smoothly without nuisance tripping. Lower core and winding losses also improve overall efficiency, reducing long-term operating costs across the service life.

Environmental Safety & Outdoor Durability

This 125kVA Transformer is PCB-free with residual levels below 1ppm, complying with RoHS and major environmental standards in North and Latin America. The ONAN oil-immersed design maintains stable operation with a 65°C temperature rise, without auxiliary cooling systems. A multi-layer corrosion-protected steel tank ensures reliable performance in rain, salt spray, dust, and UV exposure, making it suitable for long-term outdoor installations with reduced maintenance needs.

Compact Cylindrical Design for Easy Installation

The 125kVA Transformer features a one-piece cylindrical tank design with a compact footprint, suitable for both pole-mounted and indoor installations. Modular core and terminal connections simplify inspection, oil checking, and routine maintenance without special tools. This reduces servicing time and overall maintenance costs throughout its operating life.

What the Certifications and Factory Testing Actually Mean on the Ground

GUANGBIAN is ISO 9001 registered, and the design follows ANSI C57.12.00 and IEEE standards — not just on paper but throughout the build process. Once assembly is complete, each 125kVA Transformer runs through a full test battery before crating: the 37kV low-voltage power-frequency withstand, turns ratio check, impedance reading, plus no-load and load loss measurements. All numbers are verified against nameplate ratings before the unit gets packed for shipment.

Our factory

Sheet metal workshop

Foil winding workshop

Winding workshop

Winding oven workshop

Transformer assembly workshop

Transformer commissioning workshop

Frequently Asked Questions

1.What is a 125kVA single phase oil immersed distribution transformer?

A 125kVA single phase oil immersed distribution transformer is a power distribution device used to step down medium voltage to lower usable voltages for residential, commercial, and industrial applications. It uses insulating oil for cooling and insulation.

2.What are the benefits of oil immersed transformers?

Oil immersed transformers offer:

● Better cooling efficiency

● Longer service life

● Strong overload capacity

● Stable outdoor performance

● Lower maintenance requirements

3.Can Guangbian customize transformer specifications?

Yes. Guangbian can customize voltage, frequency, impedance, winding material, accessories, and standards according to your project requirements and country regulations.

4.Which industries commonly use 125kVA distribution transformers?

These transformers are widely used in:

● Utility distribution networks

● Rural electrification

● Industrial facilities

● Commercial buildings

● Hospitals

● Schools

● Renewable energy projects

Guangbian Manufacturing Strength

Established in 2004, Zhejiang Guangbian Electric Power Technology Co., Ltd. has continuously expanded its transformer manufacturing capabilities and production capacity.

Today, Guangbian:

● Produces over 6,000 power transformers annually

● Achieves annual sales exceeding USD 10 million

● Operates dedicated transformer core, winding, casing, assembly, and testing workshops

● Supplies transformers to multiple overseas markets

● Provides OEM & customized transformer solutions

Our professional engineering team understands international transformer standards and supports customized solutions for various national grid systems.

Partner with Guangbian

Guangbian is committed to supplying high-quality 125kVA single phase oil immersed distribution transformers with dependable performance, competitive pricing, and professional export support.

Whether you require standard models or customized transformer solutions, our engineering and production teams are ready to support your project with efficient and reliable power equipment.