Distribution transformers
Pole-mount, liquid-filled and dry-type transformers that step medium voltage down to the service voltage buildings and equipment use, for overhead lines and indoor electrical rooms alike.
The last step before the load
Distribution transformers do the final voltage step between the distribution network and the equipment people actually use. Overhead, that means pole-mounted, liquid-filled units hanging on the line. Indoors, it means dry-type transformers in electrical rooms, feeding lighting, HVAC, controls and IT.
GovCrest supplies both, specified to the load, the site and the efficiency standard that applies, and packaged so the electrical contractor receives exactly what the drawings call for, with nameplates, test reports and submittals ready for review.
Key features
- Pole-mount single-phase units for overhead distribution
- Ventilated and cast-coil dry-type units for indoor rooms
- Low-voltage general purpose and K-factor rated designs
- Taps for voltage adjustment on the primary side
- DOE efficiency compliance on every applicable unit
- Submittal packages ready for engineer review
Typical specifications
The ranges we source most often. Other ratings, voltages and configurations are available on request.
| Types | Pole-mount liquid-filled; ventilated dry-type; cast-coil dry-type |
|---|---|
| Pole-mount capacity | Typically 10 kVA to 167 kVA single phase |
| Dry-type capacity | 15 kVA general purpose units up to medium-voltage substation designs |
| Primary voltage | Low voltage 480 V and 600 V classes; medium voltage to the 35 kV class |
| Secondary voltage | 120/240 V, 208Y/120 V, 480Y/277 V and others as specified |
| Load profile | Standard and K-factor rated for non-linear loads |
| Efficiency | DOE 10 CFR Part 431 compliant |
| Mounting | Pole, platform, floor or wall |
Configured to the job
Every site is different. These are the options we specify most often.
Overhead pole-mount
Conventional and self-protected units with bushings, lightning arresters and tank-mounted hardware for crossarm or pole mounting.
Ventilated dry-type
Air-cooled units for indoor rooms, with no liquid to contain and simple maintenance, from general purpose to medium voltage.
Cast-coil dry-type
Windings sealed in epoxy for damp, dusty or demanding environments where moisture and contamination are a concern.
K-factor and harmonic
Designs rated for the harmonic loads of IT equipment, variable speed drives and LED lighting.
Where they go
Applications we supply for across federal, state and local projects.
- Overhead lines on bases and campuses
- Office and administrative buildings
- Laboratories and research facilities
- Hospitals and clinics
- Schools and universities
- Pump stations and treatment plants
- Traffic, rail and transit systems
- Industrial plants and warehouses
Standards we specify to
- IEEE C57.12.20, overhead distribution transformers
- IEEE C57.12.00 and C57.12.90, liquid-filled requirements and test code
- IEEE C57.12.01 and C57.12.91, dry-type requirements and test code
- UL 1561 and UL 1562, dry-type transformer safety
- DOE 10 CFR Part 431, energy conservation standards
Common questions
Straight answers to what engineers and contracting officers ask us first.
- Liquid-filled or dry-type?
- Liquid-filled units are compact, efficient and suited to outdoor installation. Dry-type units carry no liquid, which suits indoor rooms and sites where fire risk or containment is a concern. We quote to what your engineer has specified, and flag it if an alternative would ship sooner.
- What is a K-factor transformer?
- A K-factor rated transformer is built to handle the heating caused by harmonic currents from electronic loads such as computers, drives and LED lighting, without being oversized.
- Do your transformers meet DOE efficiency rules?
- Distribution transformers covered by DOE 10 CFR Part 431 are supplied compliant with the efficiency level in force, and the compliance is stated on the quote.
- Can you supply to a contractor’s submittal schedule?
- Yes. We provide cut sheets, drawings and test data for the submittal, and confirm the manufacturing slot once it is approved.
Quote on distribution transformers
Tell us the rating, voltages and quantity. We come back with pricing, a factory-confirmed lead time and the compliance position, usually within a few business days.
- Factory-confirmed lead times on every quote
- Country of origin and compliance stated up front
- A named account manager within one business day
Transformer quote
Add what you know: rating, voltages, phase and quantity. A one-line or specification can follow by email.