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Pole Mounted Transformer

Pole Mounted Transformer for Overhead Power Distribution Lines

Our Pole Mounted Transformer portfolio is engineered specifically for overhead power distribution networks in urban, suburban, and rural environments. Built to withstand rigorous environmental conditions, these units provide dependable step-down voltage conversion from medium-voltage (10 kV to 34.5 kV) primary lines to standard low-voltage distribution levels. Whether configured for standard utility applications or custom energy-efficiency requirements utilizing low-loss amorphous alloy cores, every transformer is manufactured, assembled, and tested in strict accordance with international IEEE and IEC performance standards.

Product Types and Configurations

Single-Phase Pole-Mounted Transformers
Capacity: 10 kVA to 333 kVA
Primary Voltage: 7.2 kV to 34.5 kV
Build: Available in standard design or completely self-protected (CSP) type with built-in arresters and secondary breakers for rural overhead lines.

Three-Phase Pole-Mounted Transformers
Capacity: 30 kVA to 500 kVA
Primary Voltage: 10 kV to 35 kV
Build: Three-leg or five-leg core structure in a sealed tank, used for commercial and industrial loads on utility poles.

Amorphous Alloy Core Transformers
Core Material: Low-loss amorphous metal ribbons
Performance: Cuts no-load losses by 60% to 70% compared to standard silicon steel cores to meet energy-saving rules.

Technical Specifications

Technical Parameter	Standard Specification Range
Rated Power	10 kVA to 500 kVA
Primary Voltage	10 kV, 15 kV, 25 kV, 34.5 kV (Custom taps available)
Secondary Voltage	120/240V, 240/480V (Single-phase); 400V, 415V, 480Y/277V (Three-phase)
Frequency	50 Hz or 60 Hz
Vector Group	Dyn11, Yyn0, or custom setups
Cooling Method	ONAN (Oil Natural Air Natural)
Insulating Oil	Mineral oil (ASTM D3487 / IEC 60296) or biodegradable natural ester oil
Design Standards	IEEE Std C57.12.00, IEEE Std C57.12.20, IEC 60076

Design and Construction

Core

Made of high-grade cold-rolled grain-oriented silicon steel (CRGO) or amorphous alloy. Step-lap joints are used to reduce magnetic noise and core loss.

Windings

Built with 100% copper or aluminum conductors. High-density insulation paper handles high thermal and short-circuit mechanical stress.

Tank

Heavy-gauge carbon steel with a fully welded, sealed design. Vacuum filling keeps out moisture and stops the oil from oxidizing.

Bushings

Porcelain or polymer high-voltage bushings paired with clamp or spade low-voltage terminals to stop leaks and salt-fog tracking.

Applications

Rural Power Lines

Supplies power to remote homes and farm irrigation pumps.

City Overhead Grids

Used on utility poles in areas where ground substations do not fit.

Renewable Energy

Connects small solar farms and wind power lines to the grid.

Industrial Sites

Powers roadside equipment, telecom towers, and oil-field pumps.

Manufacturing and Quality Control

Core Cutting: CNC machines cut and stack core sheets to keep sizes exact and lower energy loss.

Vacuum Drying: Parts are dried in heat-vacuum tanks to bring moisture below 10 ppm, then filled with oil in a sealed chamber.

Surface Coating: Steel tanks are grit-blasted to Sa 2.5 standard, then painted with epoxy and powder coats to pass C4/C5 marine corrosion tests.

Factory Checks: Workers check steel thickness, test weld seams with ultrasound, and run helium leak tests on finished tanks.

Custom Transformer Solutions

Voltage Taps

Off-circuit tap changers (ECTC) or load tap changers can be set to match local utility grid voltage needs.

Special Parts

Space can be made for extra surge arresters, pressure relief valves, oil level gauges, and dial thermometers.

Mounting Brackets

Hanger brackets and lifting lugs are built to fit the exact pole sizes used by your local power company.

Testing and Documentation

Factory Tests (FAT)

Every unit is tested per IEEE and IEC rules for winding resistance, voltage ratio, impedance, core loss, oil breakdown voltage, and overvoltage.

Type Test Reports

Certified reports for temperature rise, lightning impulse, and short-circuit strength are available from approved labs.

Included Documents

Each shipment comes with test sheets, assembly drawings, user manuals, and raw material mill certificates.

Packaging and Delivery

Transport Securing

Units are bolted to heavy wooden pallets and tied down with steel straps so they do not shift during ocean shipping.

Sealed Protection

Bushings are covered with heavy plastic caps or packed in sealed wooden boxes with drying agents to keep out moisture.

Shipping Support

Loaded safely into 20GP or 40HC containers. Shock and tilt sensors can be added to crates upon request.

Report on Product Qualifications

FAQ

Q: What is the normal service life of these transformers?

A: They are built to run for 25 to 30 years if kept within rated limits and serviced on time.

Q: Do you offer amorphous alloy cores to save energy?

A: Yes, amorphous cores are available to meet strict local energy-saving standards.

Q: Can these units use eco-friendly natural ester oil?

A: Yes, FR3 or similar biodegradable oils that meet IEC 62770 rules can be used for sensitive environmental projects.

Q: How do you stop rust in salty coastal areas?

A: Tanks are blast-cleaned, primed with zinc-rich epoxy, and finished with a UV-resistant topcoat to meet C4/C5 marine standards.

Q: What tests are done before shipping?

A: We test the voltage ratio, vector group, insulation resistance, losses, and dielectric oil strength on every single unit.

Q: How long does delivery take?

A: Standard models take 4 to 6 weeks. Custom voltage ratios, impedances, or special parts take 6 to 8 weeks based on material supply.

As one of the most experienced pole mounted transformer manufacturers and suppliers in China, we also support customized service. Please rest assured to wholesale bulk high quality pole mounted transformer in stock here from our factory. Contact us for more details.

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