Pole‑mounted transformer-XinYa China manufacturer
China pole‑mounted transformer Supplier,Factory 27 years in GuangDong
By Xinya Power editorial team
Pole-Mounted Transformer: Technical Overview for Overhead Distribution
A pole-mounted transformer is a single-phase or three-phase distribution transformer installed on utility poles for overhead power distribution. It is commonly used in rural electrification, suburban residential areas, agricultural networks, temporary power supply, and locations where underground cabling is not practical. The transformer is supported by a pole-mounted bracket or platform and connected to overhead conductors through high-voltage bushings and lightning arresters. The transformer core and windings are immersed in insulating oil, which provides electrical insulation and natural cooling. The tank is typically corrugated or equipped with radiators to improve heat dissipation. High-voltage connections are made through primary bushings, while low-voltage power is delivered through secondary bushings to service drops or low-voltage lines. Standard accessories include a lightning arrester, fuse cutout, grounding conductor, oil level indicator, and nameplate. Units are designed for outdoor operation and must withstand wind, rain, temperature variation, and continuous load. Pole-mounted transformers are usually rated from 5 kVA to 500 kVA, with common primary voltages of 11 kV, 13.8 kV, 22 kV, or 33 kV, and secondary voltages of 120/240 V, 230 V, or 400 V. Selection depends on load demand, supply voltage, fault level, environmental conditions, and local utility standards. Installation requires proper pole strength, secure mounting hardware, correct grounding, and compliance with clearance and safety regulations. Routine maintenance includes inspection of oil leakage, bushings, grounding connections, fuse cutouts, lightning arresters, mounting brackets, and low-voltage terminals. When correctly specified and maintained, a pole-mounted transformer provides a simple, economical, and reliable solution for overhead distribution networks.
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