Speaker
Sheng Li
(State Key Laboratory of Electrical Insulation and Power Equipment)
Description
The quench protection switch (QPS) is very important for ensuring the safety of the PF and TF coils of a superconductive Tokomak. The main function of a QPS is to protect the magnet as the coil quench occurs. Besides, a QPS has to withstand almost all of the coil current of some tens of kA flowing through it for a long time in the normal operation condition. This task is undertaken by the by-pass switch (BPS), which is an indispensable component of a QPS, no matter what principle the QPS is based on. Therefore, the study of the temperature rise is very important for optimal design of a BPS. In this paper, a scheme of a high-current BPS is proposed. The BPS consists of eight pairs of contacts in parallel which have certain capability of withstanding arc erosion during current commutation out of the BPS. The steady temperature rise of the BPS is simulated in the condition of natural convection with the approach of computational fluid dynamics. Furthermore, the influence of the space between each individual contact is investigated. Simulation results indicate that there exists certain critical space, beyond which the mutual influence of adjacent contacts can be neglected. This critical space can be regarded as a reference in designing a BPS with the trade-off between the dimension of the BPS (and the QPS) and its current-carrying capacity. The scheme has been applied in an experimental prototype of BPS. Temperature-rise experiments have been conducted on the prototype. Basically, the simulated temperature rise agrees with the experimental results. The deviation between them is also discussed.
Co-authors
Lijun Wang
(State Key Laboratory of Electrical Insulation and Power Equipment, Xi‘an Jiaotong University, Xi'an, China)
Qiaosen Wang
(State Key Laboratory of Electrical Insulation and Power Equipment, Xi‘an Jiaotong University, Xi'an, China)
Sheng Li
(State Key Laboratory of Electrical Insulation and Power Equipment, Xi‘an Jiaotong University, Xi'an, China)
Shenli Jia
(State Key Laboratory of Electrical Insulation and Power Equipment, Xi‘an Jiaotong University, Xi'an, China)
Zhanpeng Gao
(State Key Laboratory of Electrical Insulation and Power Equipment, Xi‘an Jiaotong University, Xi'an, China)
Zongqian Shi
(State Key Laboratory of Electrical Insulation and Power Equipment, Xi‘an Jiaotong University, Xi'an, China)
