PowerNex pole mount transformers are utility-grade, oil-immersed overhead distribution transformers engineered for single-phase and three-phase applications ranging from 10 kVA to 500 kVA. Designed to operate reliably on 6.6 kV, 11 kV, 13.8 kV, 22 kV, and 33 kV medium-voltage distribution systems, these pole mounted transformers provide stable voltage regulation, high efficiency, and long service life in demanding outdoor environments.
Manufactured in accordance with ANSI, IEEE, and IEC standards, PowerNex pole mount transformers feature robust tank construction, optimized core and winding design, and ONAN cooling for continuous operation with minimal maintenance. They are widely used in residential neighborhoods, rural electrification projects, agricultural power networks, and utility overhead distribution systems, offering a cost-effective and proven solution for both new installations and grid upgrades worldwide.
Utility-Grade Overhead Distribution Transformers for Reliable Power Delivery-Pole Mount Transformers
Pole Mount Transformers, also referred to as Pole-Mounted Distribution Transformers, Overhead Transformers, or Utility Pole Transformers, are a cornerstone of overhead electrical distribution systems. Installed directly on utility poles, these transformers efficiently step down medium voltage (MV) power to usable low voltage (LV) electricity for end users.
Pole mounted transformers remain the most widely deployed transformer solution worldwide, particularly across North America, Latin America, Africa, Southeast Asia, and rural Europe, thanks to their simple structure, lower installation cost, ease of maintenance, and long outdoor service life.
PowerNex pole mount transformers are engineered to meet the rigorous demands of electric utilities, rural electrification programs, agricultural power networks, and municipal infrastructure projects.
1. Product Definition & Core Advantages
A pole mount transformer is an oil-immersed distribution transformer designed for overhead installation, eliminating the need for ground-level enclosures or substations.
Key Advantages of Pole Mounted Transformers
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Low installation and civil work cost
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Minimal footprint and space requirements
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Proven reliability in harsh outdoor environments
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Fast deployment for large-scale utility rollouts
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Ideal for rural and suburban distribution networks
Compared to pad mounted transformers or compact substations, pole mount transformers offer superior cost efficiency where overhead lines are used.
2. Product Range & Electrical Parameter Coverage
PowerNex offers one of the widest pole mount transformer ranges in the industry.
Power Rating (kVA Range)
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Single Phase: 10 kVA – 167 kVA
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Three Phase: 30 kVA – 500 kVA
Voltage Classes
Primary Voltage (HV / MV):
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2.4 kV / 4.16 kV
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6.6 kV
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10 kV / 11 kV
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13.8 kV
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22 kV
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33 kV
Secondary Voltage (LV):
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120 / 240 V
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208Y / 120 V
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230 / 400 V
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277 / 480 V
Electrical Configuration
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Single-phase, center-tapped
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Three-phase delta or wye
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Frequency: 50 Hz / 60 Hz
This broad coverage ensures compatibility with ANSI, IEEE, IEC, and mixed-standard grids.
3. Design Philosophy & Structural Engineering
PowerNex pole mounted transformers are designed with a utility-first engineering philosophy, prioritizing safety, durability, and electrical stability.
Core Design
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High-grade CRGO silicon steel
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Step-lap joint construction
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Low magnetizing current and reduced core loss
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Optimized sound level for residential areas
Winding Structure
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Copper or aluminum conductors
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Multi-layer insulated winding design
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Enhanced short-circuit withstand capability
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Balanced impedance for voltage regulation
Tank & Mechanical Structure
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Fully welded steel tank
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Pressure-resistant design
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Anti-corrosion surface treatment
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Pole mounting lugs and brackets integrated
4. Manufacturing Process & Craftsmanship
Every PowerNex pole mount transformer is produced under strict process control.
Manufacturing Workflow
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Core cutting, stacking, and clamping
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Precision winding and insulation layering
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Core-coil assembly and drying
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Vacuum oil filling
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Tank sealing and pressure testing
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Surface coating and curing
This process ensures consistent electrical performance and long-term field reliability.
5. Core Components & Material Selection
Each pole mounted transformer integrates carefully selected components:
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High-efficiency magnetic core
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LV and MV windings with oil-resistant insulation
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Mineral oil or biodegradable insulating fluid
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Porcelain or polymer bushings
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Pressure relief valve
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Oil level indicator (optional)
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Lightning arrester compatibility
All components meet utility-approved specifications.
6. Cooling System & Thermal Performance
Pole mount transformers primarily use:
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ONAN (Oil Natural Air Natural) cooling
This passive cooling method ensures:
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Stable temperature rise
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Silent operation
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Zero auxiliary power consumption
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Minimal maintenance requirements
Design margins allow continuous operation under fluctuating load conditions.
7. Testing, Inspection & Laboratory Verification
Before delivery, every pole mount transformer undergoes comprehensive testing.
Routine Tests
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Winding resistance measurement
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Turns ratio and vector group verification
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No-load loss and load loss test
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Insulation resistance test
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Applied voltage and induced voltage tests
Type / Optional Tests
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Temperature rise test
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Lightning impulse test
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Short-circuit withstand test
Testing standards include ANSI / IEEE C57, IEC 60076, or utility-specific protocols.
8. Applications & Deployment Scenarios
Pole mount transformers are widely used in:
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Utility overhead distribution networks
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Residential neighborhoods
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Rural and agricultural electrification
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Schools, clinics, and municipal buildings
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Temporary construction power supply
Their flexibility makes them ideal for both new grid expansion and retrofit projects.
9. Project Case Studies
Rural Electrification – Africa
Single-phase 25–100 kVA, 11 kV / 240 V pole mount transformers deployed across multiple villages, providing reliable low-maintenance power.
Suburban Utility Upgrade – USA
Three-phase 300–500 kVA, 13.8 kV / 480 V pole mounted transformers used for feeder reinforcement and load balancing.
Agricultural Power Network – Australia
Custom pole mounted transformers with enhanced corrosion protection and heat resistance for outdoor farming environments.
10. Standards, Compliance & Energy Efficiency
PowerNex pole mount transformers comply with:
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ANSI / IEEE standards
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IEC international standards
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Utility-specific specifications
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DOE energy efficiency requirements (where applicable)
Optimized core designs reduce no-load loss, improving grid efficiency over the transformer’s lifespan.
11. Customization & Global Supply Capability
As an experienced pole mount transformer manufacturer, factory, and supplier, PowerNex provides:
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Factory-direct wholesale pricing
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OEM / private label manufacturing
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Customized voltage, kVA, impedance, and accessories
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Export support for global utility projects
We supply pole mounted transformers to the USA, Canada, Latin America, Europe, Southeast Asia, the Middle East, and Africa.
12. Why Choose PowerNex Pole Mount Transformers
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Proven utility-grade performance
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Full in-house manufacturing and testing
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Flexible customization for global grids
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Competitive lead time and pricing
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Long service life with minimal maintenance
Reliable Power Starts Above Ground
Choose PowerNex Pole Mount Transformers for safe, efficient, and dependable overhead power distribution—engineered for today’s grids and tomorrow’s growth.