Single Phase Pole Mounted Transformer

Conventional pole-mounted transformers enable stable power transmission with durable construction and adaptive grid compatibility

333 kVA

Capacity up to

34.5 kV

Primary Voltage up to

120 V

Secondary Voltage From

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General

Application

Environmental

Standards

A single phase pole mounted transformer is a compact and robust electrical device designed for efficient power distribution in overhead systems. typical ratings span 10–167 kva, with primary voltages up to 36 kv and secondary voltages up to 120/240 or 240/480 v. designs can be optimized for specified system voltages, insulation levels, temperature rise, and doe efficiency classes, while complying with relevant ieee/ansi c57 standards to support reliable, low-loss operation and long service life under diverse environmental conditions.

Single phase pole mounted transformers are applied across rural and suburban networks to supply overhead residential services, farms, and small commercial facilities from medium-voltage feeders. They step distribution voltages down at the service drop, enabling lighting, HVAC, appliances, and small motors on split-phase or single-phase systems. where compact footprint, fast installation, and reliable service continuity are critical for utilities and end users.

Application: Suitable for outdoor installation.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (25°C); ambient air RH <93%.
Altitude: ≤1000 m (above 1000 m requires derating / design adjustment).
Max wind speed: ≤35 m/s.
Seismic acceleration: Horizontal ≤0.3g, Vertical ≤0.15g.
Special conditions: Customized designs available for project-specific requirements.

IEEE C57.12.00 – General requirements for liquid-immersed distribution transformers.
IEEE C57.12.80 – Standard terminology for power and distribution transformers.
IEEE C57.12.70 – Terminal markings and connection rules for transformers.
IEEE C57.12.20 – Overhead-type distribution transformers, 500 kVA and below.
IEEE C57.12.90 – Test code for liquid-immersed distribution and power transformers.
IEEE C57.12.31 – Pole-mounted equipment enclosure integrity and corrosion performance.

Why Choose Kerun Intelec

Choose us for precision-engineered transformers—superior efficiency, global certifications, 24/7 support, and tailored solutions. Trusted durability, energy-saving innovation, ensuring optimal performance and longevity worldwide.

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Fast Lead Times

Our made-to-order production timelines are highly competitive and as low as 8 weeks from order to delivery.

Design Conformance

We maintain rigorous oversight to ensure every transformer adheres precisely to your exact specifications.

Comprehensive Warranty

We stand behind the longevity and reliability of our products with a robust warranty that covers both materials and workmanship.

Competitive Pricing

We deliver exceptional value so you receive top-tier, reliable, high-quality products without the premium price tag

Exceptional Quality

We implement strict quality control measures at every stage of production to ensure our products meet or exceed industry standards.

Dedicated Support

Our support team is always at your service.Offering expert guidance from initial inquiry through post-installation support.

Transformer Features

Engineered for overhead distribution lines, this transformer delivers efficient voltage transformation, compact pole-top installation, reliable performance, and flexible protection coordination.

Flexible Design - Well-matched to a Range of Applications.

Engineered for varied kVA ratings, primary voltages, and secondary configurations, allowing utilities to standardize one platform across rural, suburban, and light-commercial distribution duties.

Space Saving – Effective, Flexible Layout

Pole-mounted construction avoids ground-level pads and fencing, minimizing right-of-way use and permitting simple integration on existing overhead lines in constrained or dispersed locations.

Laborsaving – Reduction of Manpower

Factory assembled pole mounted units shorten wiring, lifting, and commissioning steps, reducing crew hours, outage durations, and installation complexity for utility projects.

Energy Saving – Reduced Operating Costs

Low loss core and coil design reduces no load and load losses, lowering energy costs and improving overall feeder efficiency for utilities..

High Reliability – Long-term, Trouble-free Operation

RRobust oil-immersed insulation systems, proven IEEE/ANSI designs, and short-circuit resistant windings support dependable long-term service under cyclic loading and harsh outdoor environmental conditions.

Safe Design – Ensures Operator’s Safety

Clearly marked terminations, standardized clearances, proper grounding points, and coordinated external fusing support safer switching, maintenance, and fault response for qualified lineworkers and technicians.

Minimal Maintenance – Reduced Maintenance Costs

Sealed-tank construction with durable coatings and minimal moving parts reduces inspection frequency, interventions, and replacements, supporting maintenance intervals and lower lifecycle costs.

Standard Feature

Mild Steel Tank with Welded Lifting Lugs and Hanger Brackets

Pressure Relief Valve

Aluminum Windings

Earthing Device (with LV Neutral Grounding Strap)

Amorphous Alloy Core

Nameplate

HV Bushing(S) (eye Bolt Built-in Flexible Wire)

Envirotemp™ FR3™ Fluid.

LV Bushing (eyebolt or Spade-type Terminals)

Meets Doe Energy Efficiency Standard

Optional Features

Copper windings

Tap changer

Oil Level Indicator

LV circuit breaker with reset (overload indicator light provided).

High Voltage Surge Arrester

Expulsion fuse（Elsp Fuse）

Low Voltage Surge Arrester

Drain and sampling valve

bushing with double hang erbracket configuration

Standard Birdguard

Stencils and labels according to customer requirements.

Design Drawings

The drawing details configurations for various voltage and capacity specifications, ensuring precise customization for diverse application requirements.

15kVA-Pole-Mounted-Transformer-drawing

100kVA-Pole-Mounted-Transformer-drawin

250kVA-Pole-Mounted-Transformer-drawing

333kVA-Pole-Mounted-Transformer-drawing

Accessories Include

High-Voltage Bushing

Low-Voltage Bushing

Terminal connector

Grounding terminal

Grounding strap

Transformer tank

Transformer oil

Sealing gasket

Tank cover

Pressure relief device

Surge arrester bracket

Fuse cutout bracket

Tap changer

Temperature indicator

Lifting lugs

Pole mounting brackets

radiators

Nameplate

About Construction

Understand the core, winding, tank, insulation, and pole-mounting construction designed for reliable overhead power distribution.

01

Tanks

02

Radiator

03

Core

04

Coils

05

Active Part

Tanks

Single phase pole mounted transformers use mild steel tanks fabricated with high-precision robotic welding to achieve leak-tight seams and consistent structural strength. dimensions, wall thickness, lifting lugs, hanger brackets, and accessory mounting pads are customizable to site requirements. optional galvanizing and controlled-thickness electrostatic powder coating, with selectable ral colors, enhance corrosion resistance and extend service life in diverse outdoor environments.

Mild Steel Tank Provides Robust Mechanical Strength and Stability.

precision Robotic Welding Ensures Uniform Seams and Leak-free Service.

Radiator

Single phase Pole mounted transformer radiators use cold-rolled steel panels in either welded-on or bolted modular assemblies. Automated robotic welding provides uniform seams, cooling-channel integrity, and mechanical strength. Radiator height, fin spacing, and surface area are customized to thermal duty. Coatings match the tank system, providing consistent corrosion resistance and service life in varied outdoor environments and demanding utility applications.

Radiator assemblies selectable as welded-on or bolted-on types.

Coating system matched to tank, including optional hot dip galvanizing.

Core

The core of the single phase Pole mounted transformer uses an amorphous alloy wound design with very low hysteresis and eddy-current losses. Strips are processed on fully automatic transverse cutting lines, controlling burr, length, and step-lap geometry. Tight tolerances improve no-load efficiency, reduce temperature rise and audible noise, and support long-term stable performance for utility applications under varying grid conditions.

High-grade grain-oriented silicon-steel core significantly minimizes no-load losses.

Tight stacking factor improves performance and reduces active part size.

Coils

Single phase Pole mounted transformer coils use copper or aluminum wire for HV/LV windings, with LV also available in copper or aluminum foil for improved short-circuit strength. Insulation systems can be configured with DMD, Nomex®, or Weidmann papers and boards. Automated winding and process control help maintain clearances, reduce hotspots, and deliver stable dielectric and thermal performance over time.

HV/LV Winding materials:Cu/Al wire.LV also available in Cu/Al foil.

Insulation materials: optional DMD, Nomex®, or Weidmann.

Active Part

The active part of a single phase Pole mounted transformer combines a low-loss core, precisely wound HV/LV coils, and a rigid clamping structure that stabilizes clearances under short-circuit stress. Controlled core cutting and accurate winding geometry support uniform flux density and current distribution, low noise and temperature rise, high dielectric strength, and robust lightning impulse withstand capability over service life.

Rigid Clamping Structure: Ensures coil stability and long-term performance.

Low-Loss Core: Efficient energy conversion with minimal core losses.

About Accessories

Engineered csp single-phase pole-mounted transformer accessories enhance protection, monitoring, safety and performance, optimizing reliability, maintenance efficiency, and lifetime operating costs.

01

HV Bushings

02

LV Bushings

03

Tap Changers

04

Oil Level Indicator

05

Pressure Relief Valve

06

Earthing device

07

Nameplate

HV bushings

Single phase pole mounted transformer HV bushings use high-strength porcelain or polymer insulation with eye-bolt terminals and built-in flexible leads for secure overhead conductor connection. galvanized hardware and customizable creepage distances are engineered to meet ansi withstand levels for the specified KV class, improving pollution performance, limiting surface tracking, and supporting safe, reliable switching and maintenance in outdoor installations.

Customizable voltage ratings for specific applications 5kV to 34.5kV.

Optional integrated bird guard prevents wildlife-induced outages.

LV bushing

The LV bushing for the single-phase pole-mounted transformer offers optional eyebolts or spade-type terminals, with an alternative bushing featuring a double hanger bracket configuration. Customizable with zinc-plated finishes, these bushings meet ANSI standards, ensuring reliable performance in demanding environments. The design enhances electrical connectivity, durability, and ease of installation while providing robust mechanical support.

Optional 600V or 5kV ratings for specific system coordination needs.

ANSI Standard Compliance: Meets industry standards for safety and reliability.

Tap changer

The tap changer on a single phase pole mounted transformer is typically a de-energized, off-circuit design with plated copper contacts to reduce wear and contact resistance. Tap steps and total regulating range are selected according to system voltage and feeder profile, supporting precise ratio adjustment. Clear tap position indexing helps utilities maintain voltage within specified ANSI service limits over time.

Plated Contact Surfaces: Enhances conductivity and extends operational lifespan.

Tap range configurable, for example ±2×2.5% or ±5%.

Oil Level Indicator

The oil level indicator on a single phase pole mounted transformer provides a clear mechanical reference of fluid level relative to ambient temperature marks. Dial- or column-type designs with colored segments allow lineworkers to verify adequate dielectric clearance at a glance. Corrosion-resistant housings and gasketed fittings help prevent leakage, supporting reliable insulation performance and timely detection of low-oil or potential tank integrity issues.

Easy-to-Read Indicators: Clear visual indication for quick assessments.

Corrosion-Resistant Design: Suitable for outdoor installations in harsh conditions.

Pressure Relief Valve

A pressure relief valve on a single phase pole mounted transformer is set to open at a defined internal overpressure, releasing gas generated by faults or thermal events while retaining insulating oil. The self-resetting mechanism recloses automatically after venting, limiting tank stress, reducing explosion risk, and helping utilities protect nearby equipment, line workers, and the public with minimal intervention.

Fast pressure relief minimizes mechanical stress on transformer tank.

Reliable resealing design reduces oil loss and maintenance interventions.

Earthing device

A drain and sampling valve on a single phase pole mounted transformer provides a dedicated point for controlled oil removal and routine dielectric or DGA testing. A compact, corrosion-resistant design supports secure hose connection, minimizes spillage risk, and reduces contamination. Positioned at the tank bottom, it helps utilities perform condition-based maintenance and leak investigation without disturbing primary connections.

Copper strap bonds LV neutral to tank for solid grounding.

Dedicated tank earth pads provide low-impedance connection to grid

Nameplate

A durable nameplate on a single phase pole mounted transformer consolidates all essential rating and identification data, including kVA, voltage, impedance, vector group, frequency, serial number, and applicable IEEE/ANSI standards. Clear engraving and corrosion-resistant materials support long-term legibility, Accurate nameplate information helps utilities standardize fleets, streamline maintenance, and reduce misapplication risks throughout the transformer’s operating life.

Compliant with ANSI and IEEE marking and identification requirements.

Displays kVA, voltage, impedance, vector group, cooling class clearly.

About Oil-Filled

Designed for safer and more reliable overhead distribution, our Single Phase Pole Mounted Transformer can be filled with FR3D natural ester insulating oil, offering high fire-point performance, improved moisture tolerance, enhanced insulation life, and environmentally responsible operation.

Mineral Oil

Low Transformer Cost

Good Heat Dissipation

Good Dielectric Performance

Good Cold Climate Performance

Low Maintenance Cost

Preventative Maintenance

Potentialhigher installation cost

Vaults required for indoor installations per NEC® due to low fire point

<30% biodegradability

Silicone Fluid

Low heat release

Reduced smoke

Low flame

Self extinguishing

Good dielectric performance

Low toxicity

Moderate viscosity

High stability

Non-biodegradable

Not suitable for use with internal Bay-O-Net fuses

Transformer cost

Disposal cost

Viton gaskets required

Retrofil applications

High transformer cost

High moisture absorption

Envirotemp FR3

High fire point—360 °C

High flash point—330 °C

Compatible with mineral oil

Excellent dielectric performance

Greater than 99% biodegradable

Greater tolerance to moisture, dramatically extending insulation life .

Transformer cost (lower than silicone fluid)

Pour point (–15 °C to –25 °C) transformer energized with full load with top oil temperature at –50 °C with no problems—no crystals formed at –68°C

Allows transformers to be designed to operate at 10°C higher average winding rise (75°C) without reducing normal transformer insulation life

Excellent switching medium

Excellent cold weather performance

About Testing

Comprehensive ANSI/IEEE compliant type, routine, and acceptance testing ensures dependable performance, safety, and lifecycle reliability for single-phase transformers in service.

Routine Tests

Type Tests

Special Tests

Winding Resistance

Load Loss + Impedance (percent Z)

Voltage Ratio

Dielectric: Applied AC Withstand

Polarity (single-phase)

Dielectric: Induced AC Withstand

No-load Loss + Excitation Current

Tank Tightness / Leak Test (liquid-filled)

Temperature rise

Lightning impulse withstand (BIL)

Short-circuit withstand (when specified)

Sound level (when specified)

Partial discharge (PD)

Induced voltage with PD measurement (IVPD)

Capacitance

Dissipation factor (tan δ / power factor)

Frequency response analysis (FRA)

Oil tests as specified

Transformers are tested in strict accordance with the latest revision of applicable ANSl, IEEE, nema, and rus with test reports available transformer serial number.

Package & Delivery

Engineered packaging and controlled logistics protect transformers from damage, simplifying site handling, offloading, installation and commissioning project schedules.

Wooden / Steel Skid with Sealing Film

For nearby deliveries, we recommend skid plus sealing film when you need economical protection, forklift handling and quick onsite positioning.

Wooden / Steel Frame

We suggest wooden or steel framing when you require protection for protruding parts, highway transport, repeated loading and open-deck shipping.

Wooden Crate

Preferred for export and long routes; closed crates protect from weather, dirt and impact, allow stacking and minimise accessory loss.

Container Shipment

Ideal for high-value or overseas projects; containers improve weather protection, security and standardised lashing, simplifying sea–rail–road multimodal logistics.

Transportation & Delivery

We propose skid, frame, crate or container options based on route, handling and budget, ensuring safe, efficient transformer delivery.

Single Phase Pole Mounted Transformer FAQ

Review key FAQ before purchasing a Single Phase Pole Mounted Transformer, covering lead time, grid standard customization,certified components, factory testing, installation support, and long-term reliable operation.

What Is The Lead Time For A Single Phase Pole Mounted Transformer?

The typical lead time for a single phase pole mounted transformer is 3 to 8 weeks, depending on capacity, voltage rating, bushing configuration,material availability, testing scope, drawing approval, inspection schedule, and order quantity.

Can The Transformer Be Customized For Different Grid Standards?

The transformer can be customized according to IEEE/ANSI, IEC, CSA, or local utility standards. Project-required certificates, test reports, UL-related documents, and third-party inspection reports can be provided where applicable.

What Customization Options Are Available For A Single Phase Pole Mounted Transformer?

Customization options include primary voltage, secondary voltage, capacity, winding material, insulation oil, tank material, bushing type, tap changer,mounting bracket, grounding arrangement, accessories, nameplate language, and anti-corrosion coating.

What Tests Are Performed Before Delivery?

Routine tests include winding resistance, voltage ratio, polarity, impedance, load loss, no-load loss, insulation resistance, applied voltage, induced voltage, leakage test, and oil tests. Type and special tests can be arranged as required, and third-party witnessed FAT.

Do You Support Installation And Commissioning?

Installation and commissioning support can be provided by documents, remote guidance, video support, or on-site engineers. Support includes mounting guidance, wiring checks, grounding verification, accessory assembly, pre-energization inspection, and commissioning coordination.

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Kerun Intelec

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