Pad Mounted Transformer

Transformer Substation

Pad Mounted Transformer

A pad mounted transformer is a ground-level distribution transformer sealed inside a locked, tamper-resistant steel cabinet, set on a concrete pad next to the load it serves. Utilities, commercial complexes, industrial parks, data centers and renewable generation sites use them to step medium distribution voltage down to low-voltage service — outdoors, at grade, without a fenced substation.

We build pad mounted transformers for utility and private-network projects alike: oil-immersed or dry-type, dead-front or live-front, wound and finished to your single-line diagrams. Our factory has delivered electrical equipment since 2010 — more than 4,000 projects across the switchgear and transformer lines — and every unit is routine-tested before it leaves the plant.

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Key Specifications & Options

The configuration below reflects the options we build to order for pad mounted transformers. Every parameter can be adjusted to match your drawings and site conditions — send us your requirements and our engineers will confirm what applies to your project.

ParameterOptions / Typical Range
Rated powerThree-phase 45–2,500 kVA; single-phase 10–167 kVA (typical utility ranges)
Primary voltage2.4–34.5 kV distribution class; delta or wye configuration
Secondary voltage120 V up to 600 V low-voltage service, per specification
Cooling & fluidONAN mineral oil; natural ester fluid option; dry-type air-cooled construction available
Front typeDead-front with bushing wells and elbows, or live-front with spade terminals
EnclosureTamper-resistant ventilated or non-ventilated steel cabinet; NEMA 3R / IP34 typical outdoor rating
Insulation level60–200 kV BIL, set by primary voltage class
Standards & efficiencyIEC 60076 series or IEEE C57 series; DOE 10 CFR 431 / EU Ecodesign levels where applicable

Frequently Asked Questions

What is the difference between dead-front and live-front construction?

Dead-front units keep all live parts behind insulated bushing wells and elbow connectors, so switching is done with hot-line tools from outside the cabinet — the standard for public-facing utility locations. Live-front exposes spade terminals inside the compartment, which simplifies inspection and termination at fenced or restricted sites. Tell us where the unit will sit and we configure the front accordingly.

Should I choose oil-filled or dry-type pad mounted construction?

Mineral-oil units cost less per kVA and suit most outdoor installations; ester fluid adds fire safety and environmental benefits near buildings or water. Dry-type removes fluid handling entirely and fits indoor or emissions-sensitive locations. We can quote both routes so you can compare total owning cost before committing.

Can you build to our utility standard or project drawings?

Yes — manufacturing to customer drawings is our default way of working. Send your single-line diagram with impedance, BIL, tap range and enclosure requirements, and our engineers confirm every parameter in a written quotation before production starts.

What is the lead time for a pad mounted transformer?

Lead time depends on rated power, fluid choice and the test schedule for your order, so we confirm an exact delivery date together with your quotation instead of quoting a generic number. Repeat specifications and batch orders are normally scheduled tighter than first-run custom builds.

Do the units meet efficiency regulations?

Transformers shipped into regulated markets are built to the applicable efficiency level — DOE 10 CFR 431 in the United States, EU Ecodesign Tier 2 in Europe. State your destination market and required standard with your inquiry and we match it in the offer.

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