Enable Recite

Subscribe options

Select your newsletters:

Please enter your email address:

@

Your email address will only be used for the purpose of sending you the ITER Organization publication(s) that you have requested. ITER Organization will not transfer your email address or other personal data to any other party or use it for commercial purposes.

If you change your mind, you can easily unsubscribe by clicking the unsubscribe option at the bottom of an email you've received from ITER Organization.

For more information, see our Privacy policy.

News & Media

Latest ITER Newsline

  • Remembering Bernard Bigot, ITER Director-General 2015-2022

    On the ITER site, the machinery of construction was humming just like on any weekday. Workers were concentrating on their tasks, laying rebar for new buildings [...]

    Read more

  • Tokamak assembly | Preparing for the Big Lift

    The distance was short but the challenge daunting: on Thursday last week, the first section of the plasma chamber was lifted 50 centimetres above its suppor [...]

    Read more

  • Image of the week | 13th toroidal field coil arrives from Europe

    The toroidal field coil procurement effort has been one of the longest of the ITER program, initiated by Procurement Arrangements signed in 2007 and 2008. Manuf [...]

    Read more

  • Diagnostics | Final Procurement Arrangement signed

    ITER Diagnostics reached an important milestone in December 2021 when it concluded the last Procurement Arrangement of the diagnostics program. After signing a [...]

    Read more

  • On site | A quick visit to the Control Building

    Work is progressing on the ITER Control Building, ergonomically designed for the 60 to 80 operators, engineers and researchers who will call it home.  [...]

    Read more

Of Interest

See archived entries

Electrical power

A cascade of transformations

Before it reaches the Tokamak's superconducting magnets, the electrical power from the 400 kV switchyard undergoes a cascade of transformations.

In July, the 130-tonne transformer (right) and the 4-metre-long busbar that connects it to the AC/DC converter were successfully tested at the Hyosung Factory in Changwon, Korea. The ''mushroom-like'' structures in the background belong to the high-tension testing equipment. (Click to view larger version...)
In July, the 130-tonne transformer (right) and the 4-metre-long busbar that connects it to the AC/DC converter were successfully tested at the Hyosung Factory in Changwon, Korea. The ''mushroom-like'' structures in the background belong to the high-tension testing equipment.
First, three very large pulsed power electrical network transformers—situated adjacent to the switchyard—bring the voltage down from 400 kV to 66 kV and 22 kV. This reduced voltage is then fed to the converter transformers inside of the twin Magnet Power Conversion buildings.

The converter transformers are each dedicated to a specific magnet system (central solenoid, toroidal field coils, poloidal field coils, correction coils). Their role is to bring down the voltage further—to approximately 1 kV. (The precise voltage is determined by the individual magnet system.)

All 44 converter transformers are paired with large "rectifiers" whose function is to convert the 1 kV AC current into direct current (DC), just like an "adapter" for laptops or cell phones transforms the 110 or 220 volts from the AC current into 9, 12, or 24 volts of DC current.

China is responsible for procuring the converter transformers and rectifiers for the poloidal field coils; Korea for all the other superconducting magnets; and Russia for the 5 km of busbars that connect the different components inside the Power Conversion Buildings. (Aluminium busbars in ITER can carry up to 7,000 times more current than a washing machine power cable.)

In July, the first of twelve transformers required for the central solenoid magnet system was successfully tested at the Hyosung Factory in Changwon, Korea, along with the set of high AC current busbars to connect it to the corresponding rectifier. Delivery to ITER can now be anticipated early next year.

Six of the central solenoid transformers will need to be in place by First Plasma, while six others will be installed at a later phase.


return to the latest published articles