Effect of Transverse Compressive Loading on the Quench Characteristics of Epoxy-Impregnated REBCO-Coated Conductor
- PDF / 1,122,808 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 104 Downloads / 196 Views
ORIGINAL PAPER
Effect of Transverse Compressive Loading on the Quench Characteristics of Epoxy-Impregnated REBCO-Coated Conductor Liyuan Liu 1 & Chengdong Chai 2 & Ye Yang 1 & Yunpeng Zhu 3 & Xifeng Pan 4 & Min Ji 1 & Xinsheng Yang 2 & Yong Zhao 1,2,4 Received: 27 March 2020 / Accepted: 8 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract REBCO-coated conductor is widely used in various HTS power applications. The HTS coils for power applications are generally impregnated with epoxy resin to enhance their mechanical stability, and the coil conductors would be subjected to transverse compressive loading in these applications. Although the effect of various operating conditions on the quench characteristics of REBCO-coated conductor have been investigated, the effects of compressive stress on quench characteristics of epoxyimpregnated REBCO-coated conductor has rarely been reported. This study examined the effects of transverse compressive loading on the minimum quench energy (MQE) and normal zone propagation velocities (NZPV) of epoxy-impregnated REBCOcoated conductor. The critical current of the conductor shows little degradation when transverse compressive stress is applied up to 80 MPa. Under the same compressive stress, the MQE decreases but the NZPV increases with the transport current. For fixed transport current, compressive stress increases the thermal contact conductance between conductor and epoxy which allows the heater energy of the conductor dissipating faster towards the surrounding epoxy, resulting in the increase of MQE and decrease of NZPV when increasing transverse compressive stress. The results indicate that higher compressive stress is helpful to decrease the quench damage of the conductor. Keywords REBCO-coated conductor . Epoxy impregnated . Quench . MQE . NZPV . Transverse compressive stress
1 Introduction With the advantage of large engineering current density and high strength [1, 2], REBCO-coated conductor is widely used in various HTS power applications, such
* Liyuan Liu [email protected] * Ye Yang [email protected] * Yong Zhao [email protected] 1
Institute for Advanced Study, Chengdu University, Chengdu 610106, China
2
Key laboratory of Magnetic levitation Technologies and Maglev Trains (Ministry of Education), Superconductor and New Energy R&D Center, Southwest Jiaotong University, Chengdu 610031, China
3
Southwestern Institute of Physics, Chengdu 610041, China
4
College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China
as superconducting generators, superconducting magnetic energy storage system, and high field magnets [3–5]. The thermal stability of HTS apparatus is an important engineering issue that must be addressed because the slow normal zone propagation velocity of HTS conductors as compared to the one observed for low-temperature superconductors may cause local overheating which can permanently damage the HTS apparatus. Before effective thermal stability schemes for the HTS devices can be addressed, h
Data Loading...
