Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • 23rd ITER Council | Pace and performance on track

    Working as an integrated team, the ITER Organization and seven Domestic Agencies are continuing to meet the project's demanding schedule to First Plasma in 2025 [...]

    Read more

  • Fusion Doctors | ITER hosts the future

    For three days last week, the ITER building was brimming with energy, inspiration and enthusiasm. One hundred and thirty-five young fusion aficionados took over [...]

    Read more

  • Fusion world | What's next for the stellarator?

    Earlier this year, the Wendelstein 7-X stellarator fusion project reported record achievements from its most recent experimental campaign. Newsline spoke with t [...]

    Read more

  • Metrology and the ITER machine | Perfectly planned points

    Inside of the Tokamak Complex, a network of 2,000 small 'fiducial target nests' will provide the reference datum for the dimensional control and alignment of ma [...]

    Read more

  • Breaking news | First component installed next week

    In the third week of November, the ITER Organization will be installing the first component of the machine in the basement of the Tokamak Building. The 10-met [...]

    Read more

Of Interest

See archived entries

Electricity supply

Power to the magnets

K.H.

The 50-tonne box-shaped transformer hovers about a metre and a half above ground. In a carefully calculated procedure, a crane moves the device to its final destination—a concrete slab just outside one of the two Magnet Power Conversion buildings.

This transformer is the first of 18 to be delivered by Korea. It is part of equipment being installed at the Magnet Power Conversion buildings to convert electricity to the specific configuration of voltage and current needed by the ITER magnets. (Click to view larger version...)
This transformer is the first of 18 to be delivered by Korea. It is part of equipment being installed at the Magnet Power Conversion buildings to convert electricity to the specific configuration of voltage and current needed by the ITER magnets.
Two days later, a second transformer is positioned on the opposite side of the building—this one weighing 20 tonnes.

These are the first two transformers to be delivered out of a set of 18 procured by Korea from the company Hyosung. They will be integrated into a complex arrangement of equipment dedicated to converting the power supplied by the French grid to the voltage required for the operation of ITER's magnet system. 

The magnets will run on electricity with a specific configuration of low voltage and high current. In a sequence of two steps the voltage is first converted from 400 kV to 66 or 22 kV, and then to the voltage level required by the corresponding converters. For the larger transformer installed last week it will be approximately 1kV; for the smaller, the voltage required is 0.327 kV.

The newly positioned transformers will come into action in the second step. The 20-tonne transformer will ensure electricity supply to the correction coils that will be inserted between the poloidal and toroidal field coils, while the 50-tonne transformer is linked to the plasma vertical stabilization circuit.

Both the correction coils and the vertical stabilization coils will fine-tune the plasma inside the vacuum chamber.

In a later step, the transformers outside the Magnet Power Conversion buildings will be linked to converter bridges or rectifiers on the inside. They function like adapters, converting the alternating current (AC) to direct current (DC) before it is fed into the tokamak to power the magnets.

In April, the next four transformers will arrive from Korea; by May 2019, all Korean-produced transformers will be installed. Together with transformers procured by China, there will be 32 converter units to supply the ITER magnet system.


return to the latest published articles