Pole-Mounted Transformer – Technical Description
Pole-mounted transformers are compact, distribution-class electrical devices designed to step down high-voltage electricity from overhead distribution lines to a lower voltage suitable for residential, commercial, or light industrial use. Installed on utility poles, these transformers play a critical role in local power distribution systems.
Key Features:
- Voltage Ratings: Primary voltage typically ranges from 2.4 kV to 34.5 kV; secondary voltage commonly 120/240 V, 208Y/120 V, or other customer-specified configurations.
- Power Ratings: Available from 5 kVA to 500 kVA, depending on application and utility requirements.
- Phase Options: Single-phase and three-phase models available.
- Cooling Type: Oil-filled (mineral or biodegradable fluids); optional air-cooled (dry-type) for specialized applications.
- Mounting: Overhead mounting on wooden or steel utility poles using galvanized steel brackets or crossarms.
- Bushing Configuration: High-voltage bushings located on the top or side; low-voltage terminals usually located on the bottom or side of the tank.
- Protection Options: Equipped with internal or external fuses, lightning arresters, pressure relief valves, and overload protection systems.
- Tank Design: Welded steel tank with corrosion-resistant coating; sealed or conservator-style construction.
- Standards Compliance: Designed and tested to ANSI C57, IEEE, and NEMA standards; utility-specific customizations available.
Applications:
- Rural and urban utility power distribution
- Commercial buildings
- Agricultural operations
- Temporary power for construction or events
Pole-mounted transformers offer a cost-effective, reliable solution for delivering safe, efficient power to end users in both urban and remote areas.
