Abstract
As an important equipment of power transmission, power cable has been required better performance on cable line loss and current ampacity to achieve its high reliability. This paper proposes an advanced application of superconducting transmission technology in power grid, namely tri-axial high-temperature superconducting (HTS) cable. The corresponding simplified model is established for multi-physical field analysis, and the size of each structure is determined through structural design. The temperature distribution of the cable body is analyzed according to multi-physical field coupling, and the influence of flow rate, size and other factors on the stability of the system is studied. In this paper, it is found that increasing liquid nitrogen volume and flow rate have saturation limit for lowering cable body temperature, and the axial temperature rise rate of cable body tends to be stable when it is greater than 4m. Multi-physical field analysis provides a basis for the design of HTS cable length without having system quench or liquid nitrogen gasification.
Highlights
At present, the transmission challenges towards the future grid are mainly solved by changing the transmission mode and adopting new materials, including superconducting transmission technology
With the development of the second generation of high-temperature superconducting (HTS) cable tape materials, superconducting cables can be sorted into Conductor on Round Core (CORC), twisted stacked-tape cable (TSTC), and Roebel cable
This paper designs a 10kV tri-axial HTS cable, and establishes a simplified three-dimensional simulation model based on Muti-physical field coupling
Summary
The transmission challenges towards the future grid are mainly solved by changing the transmission mode and adopting new materials, including superconducting transmission technology. The superconducting cables can be sorted into single-phase, three-phase parallel and three-phase coaxial (tri-axial) according to the interphase arrangement. The tri-axial HTS cable occupies less space and costs less, compared with single-phase superconducting cable [2]. A 1km-long 1kV/2MVA tri-axial HTS cable developed by Russia is connected to the grid and operated in Essen, Germany [3]. This paper firstly introduces the structure and parameter range of tri-axial HTS cable, and simplifies the simulation calculation by the equivalent model. The multi-physical field coupling in the finite element software Comsol is used for simulation analysis to compare the stability and reliability of the system under different structural parameters and external conditions, providing guidance and basis for the design of tri-axial HTS cable
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