Pad‑mounted transformer-XinYa China manufacturer
China pad‑mounted transformer Supplier,Factory 27 years in GuangDong
By Xinya Power editorial team
Pad-Mounted Transformer: Technical Overview for Underground Distribution Systems
A pad-mounted transformer is an oil-immersed distribution transformer enclosed in a locked, grounded metal cabinet, designed for installation on a concrete pad at ground level. It is widely used in underground residential distribution networks, commercial developments, industrial parks, and urban areas where overhead lines are impractical or aesthetically undesirable. The sealed enclosure protects internal components from environmental exposure, vandalism, and accidental contact while providing safe public access in shared spaces. The transformer core and windings are immersed in insulating oil for cooling and dielectric insulation. High-voltage connections are made through load-break or dead-break bushings accessible from the front compartment, allowing safe switching and isolation without opening the main tank. Low-voltage outputs are typically terminated in a separate compartment with fused protection. Internal components include pressure relief devices, liquid level indicators, temperature gauges, and grounding lugs. Units are designed to meet utility standards for short-circuit withstand, lightning impulse, and continuous load operation. Pad-mounted transformers are available in single-phase and three-phase configurations, with ratings typically ranging from 15 kVA to 5000 kVA. Common primary voltages include 12.47 kV, 13.8 kV, and 34.5 kV, with secondary voltages of 120/240 V or 208Y/120 V. Selection parameters include kVA rating, voltage ratio, impedance, cooling class, enclosure material, lock type, and compliance with local utility specifications. Installation requires a level concrete pad, proper grounding, and clearance per electrical codes. Routine maintenance includes oil sampling, bushing inspection, grounding verification, enclosure integrity check, and fuse replacement as needed. When correctly specified and maintained, a pad-mounted transformer provides reliable, safe, and visually unobtrusive power distribution for underground networks.
China XINYA Power Cables Co., Ltd Email: [email protected] Email: [email protected] whatsapp: +86 15289885778 Website: https://www.supplytransformer.com
