PRODUCT INFO PAGE - Used & Surplus Transformers

PRODUCT INFO PAGE - Used & Surplus Transformers

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Power transformers and distribution transformers are used to change the voltage from one level to another, to regulate the voltage level, and to control the flow of reactive kilovolt-amperes (kVA) in the power system. The kVA unit represents kilovolt-amperes, or 1,000 volt-amperes. A Voltampere (VA) is the unit of both real and reactive power in an electric circuit. For example, A single phase transformer with a 25 kVA rating is the same as a transformer with a 25,000 VA rating and could handle 500 volts at 50 amps of current.

There are step-up transformers and step-down transformers. These ones have 3 main components - a core, primary windings, and secondary windings. A power transformer is a static machine used for transforming power from one circuit to another without changing the frequency. As there is no rotating or moving parts, a transformer is classified as a static device but there are many different types: Laminated Core, Isolation transformer, Toroidal, Induction Regulator, Autotransformer, Grounding (Zig-Zag) Transformer, Phase-shifting transformer, etc.

There are 3 main mounting types:




Top brands include Carte, ABB, Siemens, Eaton, Moloney, HPS, Schneider, Emerson, Northern Transformer, VanTran and many more

There are self-protected transformers & conventional transformers. Commonly we broker single & three phase, 60Hz, dry-type or oil-filled, pole mount transformers and pad mount transformers. Dry-type transformers have the core and coil assembly installed in a gaseous or dry-compound insulating medium. Oil-filled transformers have the core and coil assembly immersed in a welded steel tank filled with mineral based oil that is commonly used for its chemical properties and dielectric strength. That oil in those transformers acts as an insulator and a cooling agent. For certain transformers there are often external radiators, oil pumps or various heat exchangers to further assist in the cooling/insulating.

In distribution systems including substations their capacity can range from <5 kVA - 50,000 KVA

In transmission systems including substations their capacity could range from 50,000 kVA - 500+ MVA

Here are some examples of common primary voltages and secondary voltages.


2.3 kV

2400 V

4160 V

12470 V

13.8 kV

14.4 kV

25 kV

34.5 kV

69 kV

72 kV

138 kV

144 kV

230 kV

345 kV

500 kV

765 kV


120 V

208 V

(230V @ 50Hz)

240 V

277 V

347 V

480 V

600 V

2400 V

4160 V

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ModelUsed & Surplus Transformers
Stock Number003438