TY - JOUR
T1 - Design and evaluation of 66 kV class RE-123 superconducting cable
AU - Minamino, T.
AU - Ohya, M.
AU - Yumura, H.
AU - Masuda, T.
AU - Nagaishi, T.
AU - Shingai, Y.
AU - Wang, X.
AU - Ueda, H.
AU - Ishiyama, A.
AU - Fujiwara, N.
N1 - Funding Information:
This work was supported by Ministry of Economy, Trade and Industry (METI) and New Energy and Industrial Technology Development Organization (NEDO).
Funding Information:
In a national project supported by Ministry of Economy, Trade and Industry (METI) and New Energy and Industrial Technology Development Organization (NEDO), Sumitomo Electric Industries, Ltd. (SEI) is trying to develop a 66 kV/5 kArms HTS cable with its own RE-123 coated conductors. The technical targets of the HTS cable in this project are (1) to reduce the AC loss, (2) to develop fault-current-proof cable structure, and (3) to design the cable so that it can be installed in conduit of 150 mm inner diameter. In Japan, for 66 kV class power cables, their soundness must be maintained in the event of fault-current accident consisting of a current of 31.5 kArms for 2 s. Generally, RE-123 coated conductors have a sharp transition of electric resistance on exceeding the critical current. Therefore, the influence of rising temperature on the conductor should be carefully examined. In order to evaluate the fault-current characteristics of RE-123 coated conductors, a 2.5-m cable core sample was manufactured and fault-current tests were conducted.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2010/11/1
Y1 - 2010/11/1
N2 - In the new national project, as wire and cable development, Sumitomo Electric Industries, Ltd. (SEI) is trying to develop a 66 kV/5 kArms high temperature superconducting (HTS) cable with its own REBa2Ca 3Ox (RE-123, RE = rare earth element) coated conductors. In an actual power grid, an inflow of current higher than the normal rated power (fault-current) can occur. The maximum fault-current condition is set at 31.5 kArms for 2 s for 66 kV-class transmission system in this project. Therefore, one of the technical targets in this project is to design the wires and cables to survive at this fault-current condition. As the first step, the prototype HTS cable was designed against the fault-current condition of 31.5 kArms for 2 s. The wires have copper plating as a stabilizer layer not to be damaged by over-currents. The designed HTS cable has a copper former and copper shield layers in parallel with the HTS conducting layers and HTS shield layers, respectively, to control the temperature rises in the cable core at fault-current conditions. As the second step, a sample HTS cable core was fabricated and fault-current tests were conducted to check its soundness. The temperature rises in the cable core were measured under various fault-current conditions. The critical current of the cable core was measured before and after the fault-current tests, and no deterioration in the critical current characteristics was observed. However, there was slight degradation of the n value. The investigation will be conducted, and the results will be fed back to designs of the RE-123 wires and cables.
AB - In the new national project, as wire and cable development, Sumitomo Electric Industries, Ltd. (SEI) is trying to develop a 66 kV/5 kArms high temperature superconducting (HTS) cable with its own REBa2Ca 3Ox (RE-123, RE = rare earth element) coated conductors. In an actual power grid, an inflow of current higher than the normal rated power (fault-current) can occur. The maximum fault-current condition is set at 31.5 kArms for 2 s for 66 kV-class transmission system in this project. Therefore, one of the technical targets in this project is to design the wires and cables to survive at this fault-current condition. As the first step, the prototype HTS cable was designed against the fault-current condition of 31.5 kArms for 2 s. The wires have copper plating as a stabilizer layer not to be damaged by over-currents. The designed HTS cable has a copper former and copper shield layers in parallel with the HTS conducting layers and HTS shield layers, respectively, to control the temperature rises in the cable core at fault-current conditions. As the second step, a sample HTS cable core was fabricated and fault-current tests were conducted to check its soundness. The temperature rises in the cable core were measured under various fault-current conditions. The critical current of the cable core was measured before and after the fault-current tests, and no deterioration in the critical current characteristics was observed. However, there was slight degradation of the n value. The investigation will be conducted, and the results will be fed back to designs of the RE-123 wires and cables.
KW - Coated conductor
KW - Fault-current
KW - Power transmission cable
KW - Textured metal substrate
UR - http://www.scopus.com/inward/record.url?scp=77957897489&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957897489&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2010.05.165
DO - 10.1016/j.physc.2010.05.165
M3 - Article
AN - SCOPUS:77957897489
VL - 470
SP - 1576
EP - 1579
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 20
ER -