Abstract
High temperature superconducting (HTS) cable, with significant low dissipation and massive current carrying capability, is a promising solution for the shortage of transmission capacity in mega-cities. China Southern Grid launched a HTS cable project in 2017 to develop a medium voltage concentric HTS cable system for installation in the distribution grid at urban area in Shenzhen City. It is the first time that concentric HTS cable system is developed and will be the first HTS cable installed in urban grid in China. The cable core mainly consists of three concentric phases winded by YBCO tapes and cold dielectric insulations in between phase-to-phase, phase-to-former, and phase-to-screen. The cable has a rated voltage of 10 kV and a rated current of 2.5 kArms. The critical current (Ic) is at least 6 kA per phase. The outline diameter of the cable core is 76 mm and the cryogenic pipe is 175 mm. As a middle step, we designed and manufactured a 30 m long prototype cable system and it was tested generally according to IEC 63075. For improvement of the manufacture processes, several short cable core samples were made, tested, and dismantled. The ultimate goal of the 30 m prototype is to verify the design and accumulate experience for the installation of the 400 m fully functional cable system in the grid. The test results of the 30 m cable prototype are presented and discussed. The 400 m class HTS concentric cable demonstration project has already started and it is expected to energize in grid in late September, 2021.
Highlights
H IGH temperature superconducting (HTS) cable technology is at the cutting edge of power transmission sector
The direct current (DC) Item Critical current (Ic) should be at least 2 × 2.5 = 3.6 kA to ensure that at any time under normal operation the HTS cable is in superconducting state
A new HTS cable project was launched in Shenzhen, China in 2007 by China Southern Grid
Summary
H IGH temperature superconducting (HTS) cable technology is at the cutting edge of power transmission sector. Several HTS cable transmission projects have demonstrated their feasibility and necessity in the last two decades [1]–[3]. China was once and is still one of the key players in HTS cable research and development. From 2017 on, a key R&D program on HTS power transmission in urban distribution grid supported by China Southern Grid was conducted. The program focuses on the feasibility and practical operation of HTS cables in urban area to mitigate the challenges of more power capacity within a smaller corridor. It explores the upgradation feasibility of urban distribution network by HTS cables. It is worth noting that this is the first concentric HTS cable project in China.
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