Analysis of Balanced Three-Phase Current Distributions in a Tri-AxialCable

AC loss in a tri-axial HTS cable with balanced current distribution

“…Since the magnetic couplings between two segments are negligibly small, we assume they are magnetically independent [7]. 1 shows the cable architecture where l sq1 and l sq2 are the segment lengths, l s is the total cable length; l ij are twist pitches of the corresponding segments.…”

“…Because of their low loss property compared with copper cables, they are constructed, tested in power grids [1][2][3][4] and investigated analytically in terms of magnetic field and AC loss considerations [1][2][3][4][5][6][7][8][9], especially for single phase cable architecture. Recently, a tri-axial cable composed of three concentric phases has been intensively developed since it reduces the amount of used HTS tapes and produce small leakage field and low heat loss in comparison with other three phase HTS cables.…”

“…We propose a method of treating two cable segments in previous studies [7][8], in order to obtain the homogeneous and balanced current distributions. Since the actual cable segments between two man-holes are different, we introduce the different segment lengths, l sq1 and l sq2 , as shown in Fig.…”

Design of HTS tri-axial cable in steady-state operation

“…As a next generation high-temperature superconductor cable, three-phase HTS tri-axial cable was developed as a potential commercial solution to meet the growing urban electric power capacity needs by replacing exiting long distance conventional underground cable system since it have higher transmission capacity, lower transmission loss, less space need, and reduced installation cost [1][2][3][4][5]. As shown in Fig.…”

“…1, the HTS tri-axial cable is composed of three concentric phases, an unsymmetrical inductance and capacitance distribution which is determined by twist pitches and radii, gives an inherent imbalance in three-phase currents distribution. In our previous research [1], we proposed a two sections structure design to overcome this limitation. Since the inductance has been balanced by dividing the cable into two longitudinal sections, the imbalance ratio of current only due to unsymmetrical capacitance distribution is increased as the line length extending.…”