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250KVA Single Phase Pole Mounted Transformer

A compact, service-ready 250 kVA single-phase pole-mounted transformer engineered for overhead distribution where space, reliability and thermal performance matter. It features a corrugated-fin tank for improved heat dissipation, flexible primary options (commonly 12.47 kV or 24.94 kV), off-circuit tap capability for site voltage trimming, and a choice of mineral oil or FR3 natural-ester dielectric for projects demanding higher fire-safety margins. Designed and tested to modern IEEE/ANSI distribution standards, this unit balances low losses with heavy duty tolerance for rural feeders, commercial spurs and utility pole-tap applications.

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Product Accessories

HV bushings (2) — oil-filled or porcelain, with dust caps and provision for surge arresters.

LV terminal pad / stud (4- or 7-hole) for common single-phase terminations.

Off-circuit HV tap changer (5-position) — readily accessible for safe de-energized voltage adjustment.

Pressure-relief device with alarm/trip contacts and vacuum pressure gauge.

Oil fill, drain and sample valves — captive caps for safe routine oil sampling.

Nameplate and wiring diagram — stainless steel plate and door-mounted schematic.

Lift/support lugs and pole-mount brackets — factory-fitted for rapid field hoist and secure pole attachment.

Optional: FR3 (natural ester) factory fill, HV surge arresters, LV fused switch or IR window for thermographic checks.

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Product Specifications

Rated Power

250 kVA

Nominal Voltages (typical)

24.94 kV / 0.277 kV (also available: 12.47 kV / 0.277 kV and other common pole classes)

Rated Current

HV ≈ 10.02 A, LV ≈ 902.5 A (based on 24.94 kV / 0.277 kV)

Tap Range

Off-circuit taps, 5 positions — 24.94 kV ±2 × 2.5% (site adjustable).

Cooling

ONAN (self-cooled); fan-assist (ONAF / KNAN) optional for extended duty.

Insulation & BIL

Insulation class A; typical BIL 95 kV (HV) / 30 kV (LV) — configurable per spec.

Impedance

~3.5% (12.47 kV variant); project value supplied on test certificate.

Winding Material

Aluminum (standard) — copper available on request.

Standards

Manufactured and tested to IEEE C57.12.20 / ANSI C57.12.20 (distribution transformer family).

Construction features

Corrugated-fin welded tank for improved convection, captive valves, pressure-relief with contacts, nameplate and pole mounting provisions.

Product Applications

Economy is more affordable

Pole mount on a distribution line to step down 12–25 kV feeders to single-phase service for groups of small residences, community lighting circuits and local municipal loads. Tap positions allow matching seasonal or line-voltage variation.

Residential feeder tap — suburban clusters
Serve a small commercial block (retail, eateries, light service bays) with 480Y/277 V secondary distribution; robust LV termination and optional LV fused switch simplify connection and selective protection.

Commercial strip-mall or small industrial spur
Supplies single-phase motors, control panels and telemetry at irrigation sites or rural water pumping stations. Optional FR3 fluid reduces fire risks near wooden structures and improves site safety margins.

Remote pump / irrigation power node
Power step-down for remote telecom shelters, UPS banks and standby generators where compact pole-mounted step-down and easy access for maintenance are required.

Telecom / backup generator tie-in

Product Advantages

Thermal efficiency engineered for continuous duty

Corrugated-fin tank increases convective surface area so the transformer dissipates heat more effectively than smooth-sided designs — enabling consistent ONAN performance and improved life expectancy under heavy daily loading.

Field-friendly serviceability & voltage flexibility

Off-circuit 5-position taps and standard LV terminations minimize truck rolls: technicians can quickly rebalance voltage, inspect the LV compartment or replace accessories with common tools and clear labeling.

Safety and compliance options that match modern site rules

Built to contemporary IEEE/ANSI distribution standards and available with FR3 natural-ester fluid for projects where enhanced fire performance and environmental credentials are required. FR3 also delivers measurable operational advantages (higher flash/fire points, improved biodegradability).

WellDone Power Transformer Plan Drawing

FAQ

What range of transformer products do you offer and which standards do they meet?

We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
How do you ensure the quality and reliability of your transformers?

Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
What are your production lead times, customization options, and global market reach?

For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.