Components and system tests on the RFX toroidal power supply

Toigo, V.; Zanotto, L.; Gaio, E.; Perna, M.; Bordignon, P.; Coffetti, A.; Novaro, R.; Bertolotto, P.; Rinaldi, Enrico; Villa, Geber

doi:10.1016/j.fusengdes.2005.06.291

Cited by 5 publications

(1 citation statement)

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“…The studies for the protection circuits of the JT-60SA superconducting magnets started in 2006, on the basis of the background knowledge and experience developed at Consorzio RFX [34][35][36][37][38]. The ITER scheme, which remains still today the reference one for applications with such high current and voltage ratings (70 kA, 24 kV) was considered, being surely suitable; however the lower requirements for the JT-60SA application (~26 kA, 5 kV) suggested to also explore the possibility of using power semiconductors controllable at turnoff.…”

Section: Feasibility Studies Of the Hybrid Mechanical-static DC Circu...mentioning

confidence: 99%

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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