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Start Over Descriptor "Fast discharge unit" Topic superconductivity
2 results on '"Fast discharge unit"'

1. Transient DC-Arc Voltage Model in the Hybrid Switch of the DTT Fast Discharge Unit

Author

Carmelo Riccardo Lopes, Pietro Zito, Gaetano Zizzo, Guido Ala, Alessandro Lampasi, Lopes C.R., Ala G., Zizzo G., Zito P., and Lampasi A.

Subjects
Superconductivity, Tokamak, Materials science, Nuclear engineering, Divertor, Phase (waves), Quench protection, Superconducting magnet, Hybrid circuit breaker, Arc voltage, law.invention, Power (physics), Arc (geometry), Settore ING-IND/33 - Sistemi Elettrici Per L'Energia, Settore ING-IND/31 - Elettrotecnica, Fast discharge unit, law, Transient (oscillation), Voltage
Abstract

The focus of this work is the transient modelling of the DC-arc voltage on a Hybrid Switch (a mechanical switch in parallel with a static switch) of a key protection component called Fast Discharge Unit (FDU) in the Divertor Tokamak Test (DTT). The DTT facility is an experimental tokamak in advanced design and realization phase, which will be built in the ENEA Research Centre in Frascati (Italy). The FDU allows the safe discharge of the Toroidal Field (TF) superconducting magnets when a quench is detected or a failure occurs in the power supply or in the cryogenic system. In this work, the arc conductance of the mechanical By-Pass Switch (BPS) of the Hybrid Switch is modelled using the well-known Mayr-Cassie equations and the Paukert arc parameters. The simulations show a good agreement with the expected results in terms of voltage and current transient from the mechanical switch to the static switch.

Published
2021

2. System integration of the ITER switching networks, fast discharge units and busbars

Author

Milani, Francesco, Roshal, Alexander, Benfatto, Ivone, Song, Inho, and Thomsen, Jeff

Subjects
*FUSION reactors, *SWITCHING circuits, *ELECTRIC discharges, *BUS conductors (Electricity), *ELECTRIC resistors, *TOROIDAL magnetic circuits, *SUPERCONDUCTIVITY, *ELECTRIC circuit breakers, *ENERGY dissipation
Abstract

Abstract: In ITER, switching networks and fast discharge units consist of large resistor banks which are inserted in the toroidal field, central solenoid and poloidal field circuits by means of appropriate circuit breakers. These breakers are connected by water-cooled aluminum busbars to the AC/DC thyristor converters on one side and to the superconducting coils on the other side. Switching networks are used at every pulse for plasma initiation and ramp-up, whereas fast discharge units are used to protect the superconducting coils in case of quench, by dissipating the energy stored in the coils into the resistors. This paper deals with system integration aspects, a subject which has become more and more important as a consequence of the necessity to define the requirements for the ITER buildings. In particular, seismic analyses carried out for the finalization of the layout of the toroidal field circuit busbars in the Tokamak building, features of the Resistor building and issues associated to the routing of the cables connecting the resistors to the switches located in the Tokamak complex will be described. [Copyright &y& Elsevier]

Published
2011
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