Power transformers.
Substation power transformers for utilities, industrial sites and new generation, rated in MVA, with high side voltages commonly from 69 kV to 345 kV.
RatingIn MVA, from tens to hundreds of MVA a unit
Voltage classCommonly 69 kV to 345 kV on the high side
CoolingOil and natural air (ONAN), often with fans added (ONAF)
Where they come fromUtility spares, canceled projects, plant retirements, upgrades
If you're selling, have ready
- Nameplate photo, with the maker and serial number
- MVA rating and the voltages on each side
- Impedance and cooling class (ONAN, ONAF)
- Year of manufacture
- Factory test reports
- Oil test results and DGA history
- Tap changer type: on load or de-energized
- How it was stored: oil filled or under dry gas, indoors or out
- What's included: bushings, radiators, conservator, controls
- Removal: who, how fast, any site deadline
If you're buying, ask
- Oil test results and the dissolved gas (DGA) trend over time
- Transport weight, and the route from its site to yours
- Which bushings and accessories are included, and any that are missing
- Whether the impedance matches your system study
- Whether the voltages and tap range match your needs
- How long it has sat idle, and how it was kept dry
- Who pays for removal, shipping and testing on arrival
Why existing units matter
New large power transformers commonly take two years or more from order to delivery.
A spare that already exists, held by a utility or left at a closed site, can be tested, bought and moved on a much shorter schedule. It still needs its test records, an independent inspection and a heavy haul plan. We bring the records to the buyer and keep each step moving.