Structure Optimization of Fast Discharge Resistor System for Quench Protection System

Abstract

In the quench protection (QP) process of superconducting fusion devices, the operating reliability and efficiency of power components are affected by stray parameters of the fast discharge resistor (FDR) system, especially the system stray inductance. In this paper, the fundamental condition of the QP operating process and the large power FDR system structure layout for the Large-scale Superconductor Test Facility (LSTF) are presented. The negative affected VCB, CPC circuit action, and the energy discharging process are further analyzed. The stray inductance optimization method of the resistor module and structure connections are proposed to reduce the stray inductance value. Finally, the optimization results are presented by the Q3D module of the FEA software.

The Influence of Metal Plates on Quench Protection of High Temperature Superconducting Pancake Coils

“…A basic active quench protection system promptly forces the energy stored in the coil to be released using dump resistances or quench heaters [10]- [13]. However, an excessively fast discharging operation may lead to voltage breakdown in the coil [14], [15]. It is sometimes difficult for the quench heater to heat the entire HTS coil to the normal state in a sufficiently short time when the coils are too large [16], [17].…”

A commutation analytical model for quench protection of the CFETR central solenoid model coil

“…In ITER, the mechanical switch and thyristor in parallel with the counter-pulse network are employed in the quench protection system called fast discharge unit (FDU) [7]. For CFETR, investigations about the quench protection unit are still in the process [8][9][10][11][12]. With the demand of the high reliability and simple for construction, the mature solution of fuse-based commutation, which has been employed in EAST and LHD, is more applicable [13,14].…”