PRODUCT INFO PAGE - Used & Surplus Transformers

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:

Pad-Mount

Pole-Mount

Vault/Network

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.

Primary

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

Secondary

120 V

208 V

(230V @ 50Hz)

240 V

277 V

347 V

480 V

600 V

2400 V

4160 V

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