2500 KVA Pad Mount Three-Phase Oil-Immersed Distribution Transformer

The 2500 kVA Pad Mounted Transformer represents the maximum power density achievable within the standard commercial distribution footprint. Delivering over 3000 Amps at 480V, this unit serves as the primary energy node for large-scale infrastructure, pushing the physics of passive cooling to the edge of the enclosure limits.

This unit is engineered to cover the full spectrum of ANSI specifications. Depending on your safety protocols, we configure the HV compartment to meet ansi c57 12.22 for Live-Front applications (typically for industrial grids requiring visible air gaps and arresters) or ansi c57 12.26 for Dead-Front applications (using separable insulated connectors for maximum public safety). By adhering to the strict dimensional constraints of these standards, we guarantee that this massive 2.5 MVA unit maintains Dimensional Interchangeability, dropping onto existing concrete pads without requiring expensive masonry modifications.

While the term pad mounted residential transformer usually implies small 50 kVA cans, the 2500 kVA unit serves the "Residential District" level.

• High-Density Housing: In modern urban planning, this unit functions as the centralized power plant for high-rise condominium towers (30+ stories) or sprawling gated communities.
• Underground Backbone: Instead of feeding a single house, it energizes the main 480V bus duct that runs vertically through a residential tower, or feeds a localized underground loop that distributes power to 20-30 smaller step-down transformers in a large subdivision.

At 2500 kVA, the heat rejection requirement is significant.

• Corrugated Cooling: The tank walls utilize deep-folded steel corrugations (fins) rather than flat steel. This increases the surface area by over 300%, allowing the unit to maintain a standard 65°C Temperature Rise solely through natural convection (ONAN), without the noise or maintenance liability of external cooling fans.
• Fluid Safety: Given the large volume of oil (approx. 500-600 gallons), we strongly recommend configuring this unit with Natural Ester Fluid. This high-flashpoint fluid mitigates the fire risk inherent in placing such a large energy source near residential structures.

Green label on transformer tank indicating use of biodegradable

natural ester fluid.

Technical Parameter	Specification Data
Rated Power	2500 kVA (Max ANSI Standard)
Standard Compliance	ANSI C57.12.22 (Live-Front) / ANSI C57.12.26 (Dead-Front)
Primary Voltage	12.47kV / 13.2kV / 24.9kV / 34.5kV
Secondary Voltage	480Y/277V or 208Y/120V
Rated Current	~3007 A (at 480V)
Replacement Scope	Universal ANSI Footprint
Cooling Class	ONAN / KNAN (Natural Ester)
Total Weight	Approx. 6,500 - 7,200 kg

Corrugated cooling fins on the transformer tank wall for heat

dissipation.

• Crypto Mining Farms: High-density power deployment where multiple 2.5 MVA units are lined up to power containerized mining rigs.
• Skyscraper Utilities: Sitting in the basement or podium level of a residential skyscraper, providing the main incomer service.
• Hospital Main Feed: Acting as the N+1 redundant supply for a hospital's central energy plant.

2500 kVA pad mounted transformer serving as the main power

supply for a large hospital campus.