25kVA 34.5kVA 50kVA 75kVA 100kVA Single Pole Mounted Transformer
25kVA 34.5kVA 50kVA 75kVA 100kVA Single Pole Mounted Transformer 13.2kV 13.8kV to 120V 220V 50Hz 60Hz Oil Immersed Distribution Transformer
1. Product Description
The single pole mounted transformer is a standard oil-immersed overhead distribution transformer widely deployed in global overhead power grid systems, specially engineered for outdoor utility pole installation and single-phase low-to-medium load power conversion. This full product lineup covers mainstream capacity grades including 25kVA, 34.5kVA, 50kVA, 75kVA and 100kVA, fully matching the power demand of residential clusters, rural electrification and small commercial power scenarios. Supporting dual primary voltage input of 13.2kV and 13.8kV, and standard low-voltage output of 120V and 220V, the equipment adapts perfectly to North American, Southeast Asian and South American regional power grid standards.
Available in universal 50Hz and 60Hz operating frequency versions, this overhead single-phase transformer complies with ANSI and IEC industrial specifications, featuring mature oil-filled insulation and natural circulation heat dissipation structure. The core and coil assembly adopts high-grade cold-rolled oriented silicon steel sheets and full copper windings, effectively suppressing no-load loss and magnetic flux leakage during long-term operation. Different from ground-mounted distribution transformers, the single pole mounted design integrates mounting lugs and fixed brackets, enabling direct installation on concrete and steel utility poles without complex foundation construction, which greatly simplifies on-site deployment.
Every unit from 25kVA small-load model to 100kVA medium-capacity model adopts a fully sealed corrugated oil tank structure, which isolates internal insulating oil from external air and moisture. This design avoids oil deterioration and insulation aging caused by long-term outdoor exposure, ensuring stable electrical performance in complex outdoor environments. With flexible voltage matching and dual-frequency compatibility, this 13.2kV/13.8kV single-phase pole transformer has become the most practical and cost-effective terminal power distribution equipment for overhead medium-voltage power grids.
2. Core Product Features
2.1 Full Capacity Model Coverage & Versatile Voltage Matching
This single pole mounted transformer series covers complete mainstream capacity specifications: 25kVA, 34.5kVA, 50kVA, 75kVA and 100kVA, covering all common single-phase load ranges from scattered household power supply to centralized small commercial power consumption. It supports dual medium-voltage input of 13.2kV and 13.8kV, two of the most widely used overhead line voltage grades in global distribution networks. Meanwhile, it provides standard low-voltage output options of 120V and 220V, which can directly supply power for household lighting, civilian electrical appliances and small single-phase equipment, realizing one-piece multi-scenario matching without additional voltage conversion accessories.
2.2 Dual 50Hz/60Hz Frequency Adaptive Design
To adapt to global grid frequency differences, the entire series supports customized 50Hz and 60Hz rated operating frequency. The 50Hz version fits most Asian, European and African power grid systems, while the 60Hz model is specially optimized for North American and Southeast Asian power supply standards. Through precise winding turn ratio calibration and core parameter optimization, the transformer maintains stable voltage output and low loss operation under fixed frequency, effectively avoiding frequency mismatch problems such as voltage drift, equipment overheating and increased power consumption. It ensures consistent power supply quality for long-term continuous operation.
2.3 Low Loss, High Efficiency & Energy-Saving Performance
Optimized silicon steel core stacking process and high-conductivity copper winding structure greatly reduce no-load loss and load loss during equipment operation. Compared with traditional old-style pole-mounted transformers, the energy efficiency of this 25kVA–100kVA single-phase transformer is significantly improved. Even under long-term light-load and intermittent operating states common in residential power supply scenarios, it can still maintain high-efficiency power conversion, effectively reducing daily grid operation energy consumption and long-term operating costs for power utilities.
2.4 Outdoor Weather Resistance & Structural Stability
Designed for open-air overhead installation, the transformer shell adopts heavy-duty anti-corrosion, rust-proof and UV-resistant spraying technology, which can resist wind and rain erosion, high-temperature exposure and low-temperature freezing. The fully sealed oil tank structure prevents dust, moisture and corrosive gas from entering the interior, protecting internal insulation performance and core components. The integral welded structure has strong seismic resistance and wind load resistance, and can operate stably for years in rural open areas, suburban roads and coastal humid environments without frequent failures.
2.5 Easy Installation & Low Maintenance Cost
Equipped with standard pole mounting brackets and reserved installation holes, the single pole mounted transformer can be quickly fixed on various utility poles, featuring simple installation process and short construction period. The oil-immersed fully sealed design realizes long-term maintenance-free operation under normal working conditions, eliminating the need for frequent oil replenishment and internal cleaning. The simple structural layout also facilitates daily inspection and fault troubleshooting, greatly reducing later operation and maintenance manpower and material costs.
3. Core Purpose
The core purpose of the 25kVA–100kVA 50Hz/60Hz single pole mounted transformer is to complete safe and reliable medium-to-low voltage step-down conversion for overhead single-phase power distribution systems. It mainly converts 13.2kV and 13.8kV medium-voltage overhead line electric energy into usable 120V and 220V low-voltage civilian power, realizing accurate power distribution from urban and rural trunk power grids to terminal user power consumption points.
In actual grid operation, this overhead distribution transformer undertakes key tasks of voltage stabilization, power load distribution and grid fault isolation. It solves the problems of voltage attenuation and power instability in long-distance overhead power transmission, ensures the stability of terminal 120V/220V power supply voltage and 50Hz/60Hz power frequency, and protects the safe operation of household electrical equipment, lighting systems and small commercial power devices. For scattered rural power loads and decentralized suburban residential power supply scenarios, it effectively improves power supply coverage and power supply quality of regional power grids.
In addition, the equipment can balance regional single-phase power load distribution, avoid local grid overload operation, reduce power transmission loss, and improve the overall operating efficiency and safety of overhead distribution networks. It is an indispensable core terminal device for modern urban and rural power grid construction and renovation.
4. Application Scenarios
4.1 Urban & Rural Residential Power Distribution
This single pole mounted transformer series is widely used in urban suburban communities, rural residential clusters and scattered household power supply projects. Low-capacity 25kVA and 34.5kVA models are suitable for single remote households and small residential groups with low power load; medium-capacity 50kVA and 75kVA specifications are the most common choices for conventional village and suburban community power supply; the 100kVA high-capacity model is applicable for densely populated residential blocks with large power consumption. The stable 120V and 220V voltage output fully meets daily lighting, household appliance and civilian power consumption demands.
4.2 Agricultural & Rural Infrastructure Power Supply
It is perfectly applicable to farmland irrigation equipment, rural breeding bases, greenhouse facilities and rural public infrastructure power supply. Agricultural power consumption features scattered points and low single-point load, which matches the operating advantages of single-phase pole-mounted transformers. The outdoor weather-resistant structure adapts to field open-air working conditions, providing stable 50Hz or 60Hz frequency power support for agricultural water pumps, ventilation equipment and rural street lighting systems, ensuring continuous and reliable operation of rural agricultural and public facilities.
4.3 Small Commercial & Street Facility Power Supply
50kVA to 100kVA single pole mounted transformers are commonly deployed in urban street commercial stores, roadside service facilities, community supporting businesses and urban street lighting systems. These small commercial scenarios mainly rely on 120V and 220V single-phase power supply with stable and concentrated load. The low-noise operation and high stability of the equipment will not affect urban environmental quality, and the overhead installation method saves urban ground space, which is very suitable for urban public and small commercial power distribution scenarios.
4.4 Remote Area & Overhead Grid Renovation Projects
The equipment is widely used in remote mountainous areas, island areas and old urban-rural overhead power grid renovation projects. The 13.2kV and 13.8kV high-voltage input adapts to most regional overhead line standards, while the flexible capacity grades solve the problem of insufficient power supply capacity of old power grids. The convenient pole-mounted installation is suitable for rapid grid layout in remote areas with limited terrain conditions, effectively improving power grid coverage and solving the power consumption difficulty of remote users.
5. Frequently Asked Questions (FAQ)
Q1: How to choose between 13.2kV and 13.8kV primary voltage, 50Hz and 60Hz frequency for pole mounted transformers?
The selection of primary voltage and operating frequency must strictly match local grid operation standards. 13.2kV and 13.8kV are two mainstream medium-voltage grades for overhead distribution lines; users need to confirm the actual line voltage of regional overhead power grids to avoid voltage mismatch. In terms of frequency, 50Hz single pole mounted transformers are suitable for most regions in Asia, Europe and Africa, while 60Hz models are standard for North America and parts of Southeast Asia. Mismatched frequency and voltage will cause unstable output voltage, increased equipment loss and even overheating damage. All our 25kVA–100kVA models support customized voltage and frequency configuration to fit diverse grid standards.
Q2: How to select the correct capacity from 25kVA, 34.5kVA, 50kVA, 75kVA and 100kVA for actual power supply scenarios?
Capacity selection depends on actual peak power load and reserved load growth margin. 25kVA and 34.5kVA ultra-small capacity models are ideal for single remote households, independent street lighting and ultra-light agricultural loads. 50kVA and 75kVA are universal mainstream specifications, suitable for ordinary village clusters, suburban residential areas and small rural public facilities. The 100kVA large-capacity model is recommended for dense residential blocks and concentrated small commercial power supply scenarios. It is advised to reserve 15%–20% capacity margin on the basis of actual peak load to prevent long-term full-load operation and extend transformer service life.
Q3: What are the common operating faults and practical maintenance methods for outdoor single pole mounted transformers?
Common faults of outdoor single pole mounted transformers include insulating oil aging, shell oil leakage, abnormal operating noise and unstable 120V/220V output voltage, mostly caused by long-term outdoor exposure, seasonal temperature changes and occasional overload impact. Daily maintenance is simple and practical: regularly check the oil level and oil quality of the sealed oil tank to avoid oil leakage and deterioration; clean radiator surface dust and debris to ensure unobstructed heat dissipation; regularly test grounding resistance and insulation performance to eliminate hidden insulation dangers. In addition, avoid long-term overload operation exceeding rated kVA, and regularly check the firmness of pole mounting hardware. Standard routine inspection can effectively reduce failure rate and ensure long-term stable operation of 50Hz/60Hz pole-mounted distribution transformers.
