Final tests of the four switching network units procured by the European Union for JT-60SA

Lampasi, Alessandro; Zito, Pietro; Novello, L.; Matsukawa, M.; Shimada, Kaoru; Burini, Filippo; Taddia, Giuseppe; Tenconi, S.

doi:10.1016/j.fusengdes.2017.02.010

Cited by 5 publications

(11 citation statements)

References 3 publications

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“…The "worst-case" SNU opening time is that obtained in non-nominal conditions, namely at currents lower than 20 kA. In fact, since the SCB snubbers and parasitic elements were optimized for the most important specification that is the opening time at nominal current, the opening time can be longer at lower currents (see also discussion in Section 5.3 and [8]). On the other hand, the SNU and MS closing times resulted to be shorter in non-nominal conditions.…”

Section: Snu Specificationsmentioning

confidence: 99%

“…Phase and operations of CS with a SNU described on experimental data. The showed current waveform was measured during a full-current (20 kA) and full-voltage (5 kV) test of the CS SNU prototype performed in the ENEA tokamak (FTU) [8]. SNU operations are crucial for the tokamak experiments, as they allow the abrupt current derivatives and overvoltages required during PBR and PRP and perform an opening and closing succession in every meaningful experiment.…”

Section: Snu Specificationsmentioning

confidence: 99%

“…According to this agreement, the procurement of the different systems composing JT-60SA is managed as in-kind contribution shared between European and Japanese institutions [5]. Among the power supply (PS) systems, the procurement of four switching systems, named Switching Network Units (SNUs) in the nuclear fusion jargon, for the four CS modules is supported by the European Union [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…In this way, the SCB operations can improve the equivalent time performances of the SNU by virtually hiding the BPS operations. At the same time, the support given by the SCB during the BPS opening can improve the expected lifecycle and reliability by reducing the arc stresses [6,8]. On the other hand, the global power losses practically correspond to the negligible BPS conduction losses, as the current flows only through the BPS during most of the tokamak operations.…”

Section: Introductionmentioning

confidence: 99%

“…Each CS SNU is in series with a Base PS (4-quadrant thyristor-bridge AC/DC converter) and with a QPC (for safe discharge of the energy stored in the superconducting coils). Information on the JT-60SA CS and related PS circuit: (a) Sketch of the JT-60SA tokamak with information on the position of the CS with respect to the plasma and other coils; (b) Simplified functional scheme of the SNU inserted in the electrical circuit of the CS4 module [8]. The other three CS modules (CS1, CS12 and CS3) are supplied by similar circuits with identical SNUs.…”

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confidence: 99%

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Installation, Commissioning and Tests of Four Fast Switching Units of up to 20 kA for the JT-60SA Nuclear Fusion Experiment

Lampasi

Burini²,

Taddia³

et al. 2018

Energies

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The nuclear fusion project JT-60SA is presently under construction in Naka (Japan) as a joint collaboration between Europe and Japan, within the framework of the Broader Approach Agreement. According to such agreement, the various JT-60SA systems are supplied by European and Japanese institutions. In particular, the Italian Agency ENEA was in charge for the procurement of the four Switching Network Units (SNUs) for the JT-60SA Central Solenoid (CS). The main SNU function is to interrupt a DC current up to 20 kA in a short time (less than 1 ms) in order to produce an overvoltage of up to 5 kV, crucial to generate and sustain the fusion plasma. The SNU design, manufacturing and factory test activities have been completed in 2016. After the delivery in Naka, the four SNUs have been installed and successfully commissioned in 2017. After an overview on the main technical characteristics of the SNUs and the key aspects of their design, this paper describes the activities performed on-site, highlighting the results obtained during the final acceptance tests and comparing them with the design simulation and the factory test results.

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Section: Snu Specificationsmentioning

confidence: 99%

Section: Snu Specificationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Installation, Commissioning and Tests of Four Fast Switching Units of up to 20 kA for the JT-60SA Nuclear Fusion Experiment

Lampasi

Burini²,

Taddia³

et al. 2018

Energies

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The new technological solution for the JT-60SA quench protection circuits

Gaio¹,

Maistrello²,

Novello³

et al. 2018

Nucl. Fusion

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An advanced technology has been developed and employed for the main circuit breakers (CB) of the quench protection circuits (QPC) of the superconducting coils of JT-60SA: it consists in a Hybrid mechanical-static CB (HCB) composed of a mechanical Bypass switch (BPS) for conducting the continuous current, in parallel to a static circuit breaker (SCB) based on integrated gate commutated thyristor (IGCT) for current interruption. It was the result of a R&D program carried out since 2006 to identify innovative solutions for the interruption of high dc current, able to improve the maintainability and availability of the CB. The HCB developed for the JT-60SA QPC is the first realization of a dc circuit breaker based on this design approach for interrupting current of some tens of kA with reapplied voltage of some kV. It also represents the first application of hybrid technology with IGCT for protection of superconducting magnets in fusion experiments. The paper aims at giving a comprehensive overview of the main R&D activities devoted to the development of this new technological approach; then, the key aspects of the design, manufacturing and testing of the QPCs for JT-60SA, successfully completed in Naka Site in summer 2015 are presented. Finally, the significance of this research is discussed and the possible future developments, in particular in view of DEMO fusion reactor, are outlined.

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Installation, commissioning and acceptance tests of the Switching Network Units for the central solenoids of JT-60SA

Burini¹,

Taddia²,

Tenconi³

et al. 2017

2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Syst

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Final tests of the four switching network units procured by the European Union for JT-60SA

Cited by 5 publications

References 3 publications

Installation, Commissioning and Tests of Four Fast Switching Units of up to 20 kA for the JT-60SA Nuclear Fusion Experiment

Installation, Commissioning and Tests of Four Fast Switching Units of up to 20 kA for the JT-60SA Nuclear Fusion Experiment

The new technological solution for the JT-60SA quench protection circuits

Installation, commissioning and acceptance tests of the Switching Network Units for the central solenoids of JT-60SA

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