Analysis of the Temperature Characteristics of Three-Phase Coaxial Superconducting Power Cable according to a Liquid Nitrogen Circulation Method for Real-Grid Application in Korea

Abstract

Large-capacity superconducting power cables are in the spotlight to replace existing underground transmission power cables for energy power transmission. Among them, the three-phase coaxial superconducting power cable has the economic advantage of reducing the superconducting shielding layer by enabling magnetic shielding when the three phases are homogeneous without an independent superconducting shielding layer for magnetic shielding. In order to develop the three-phase coaxial superconducting power cable, the electrical and structural design should be carried out to construct the superconducting layer. However, the thermal design and analysis for the cooling of the three-phase coaxial superconducting power cable must be done first, so that the electrical design can be made using the temperature transferred to the superconducting layer. The three-phase coaxial superconducting cable requires a cooling system to circulate the cryogenic refrigerant for cooling below a certain temperature, and the structure of the cable through which the cryogenic refrigerant travels must also be analyzed. In this paper, the authors conducted a longitudinal temperature analysis according to the structure of the refrigerant circulation system of the cable and proposed a refrigerant circulation system suitable for this development. The temperature profile according to this analysis was then used as a function of temperature for the electrical (superconducting and insulating layers) design of the three-phase coaxial superconducting power cable. It is also expected to be used to analyze the cooling structure of the three-phase coaxial superconducting power cable installed in the real grid system.

Study on the Effect of Cable Group Laying Mode on Temperature Field Distribution and Cable Ampacity

“…The works by the authors of [6][7][8][9][10][11][12][13][14][15][16][17] set different boundary conditions and changed the structural parameters of cables in different environments; they obtained steady temperature field distribution of regular laying cables by analytical, numerical methods and other computational methods. Ruan, J.…”

“…Lee, S.J. [8] conducted a longitudinal temperature analysis according to the structure of the refrigerant circulation system of the cable and proposed a refrigerant circulation system. Sedaghat A [9] derived a scientifically sound and accurate thermal electric circuit for the calculation of the steady-state temperature of cables in air from first thermodynamic principles.…”

Performance Analysis of Real-Scale 23 kV/60 MVA Class Tri-Axial HTS Power Cable for Real-Grid Application in Korea

“…Figures 13 and 14 show the configuration of the AC loss measurement method of the tri-axial HTS power cable. The AC loss was measured for each phase through the voltage taps and the current sensor on A, B, and C, and the total cable loss according to the unit length was calculated [24,25]. The tri-axial HTS power cable is connected to both ends of the AC current source, and the voltage is measured by the signal wire attached to the cable.…”

An open-source 2D finite difference based transient electro-thermal simulation model for three-phase concentric superconducting power cables

“…Nevertheless, a 1D approach can not take into account the heat removal by the liquid nitrogen flows. Two dimensional transient models (2D) were developed by using finite element (FEM) packages [27,28] and finite volume method [29] through commercial software. For the simulation of HTS cables in electrical systems the entire control of the simulation process is valuable, thereby, closed-source numerical models of commercial software may not be a suitable tool, although powerful.…”