Characteristic Tests of GdBCO Superconducting Transformer With Different Iron Core Structures

Impact of the radius of double pancake windings on the electromagnetic behavior of high temperature superconducting transformer

“…As the current on the low-voltage (LV) winding side is usually high, to achieve large capacities in HTS transformers, the LV winding is connected in parallel branches so that the current is divided between the branches. Due to the low resistance of the HTS tapes, a slight imbalance between the inductances of the parallel branches [double pancakes (DPs)] causes non-uniformity in currents, so that in the normal case, the current in the highest and lowest DP may rise up to two times more than other DPs (Hu et al , 2017a, 2017b, 2017c, 2017d).…”

“…As the current on the low-voltage (LV) winding side is usually high, to achieve large capacities in HTS transformers, the LV winding is connected in parallel branches so that the current is divided between the branches. Due to the low resistance of the HTS tapes, a slight imbalance between the inductances of the parallel branches [double pancakes (DPs)] causes non-uniformity in currents, so that in the normal case, the current in the highest and lowest DP may rise up to two times more than other DPs (Hu et al, 2017a(Hu et al, , 2017b(Hu et al, , 2017c(Hu et al, , 2017d. The use of flux diverter in Kim et al (2005), the investigation of the structural effect of flux diverter in Wu et al (2019), the use of genetic algorithm for the optimal design of flux diverter in Moradnouri et al (2019) have been used to reduce the magnetic field and short-circuit forces in the HTS transformers.…”

“…In Li et al (2006Li et al ( , 2005, the electromagnetic parameters of single-phase HTS transformers with two types of core models (E-core and C-core) and three types of winding configurations (helical, cylindrical and pancake) have been studied. The analysis of magnetic parameters on HTS windings with air core in Bai et al (2019), Ogawa et al (2016) and partial and full core in Hu et al (2016aHu et al ( , 2016bHu et al ( , 2017aHu et al ( , 2017bHu et al ( , 2017cHu et al ( , 2017d have also been investigated. Using the auxiliary winding helps to reduce the leakage magnetic flux and AC losses (Heydari et al, 2007).…”

“…High temperature superconducting (HTS) transformers have been noticed for their advantages over conventional transformers, including lower losses and higher efficiencies, lower volume and Impact of the radius of double pancake windings weight and more favorable environmental effects (Hu et al, 2017a(Hu et al, , 2017b(Hu et al, , 2017c(Hu et al, , 2017dWojtasiewicz et al, 2012). As the current on the low-voltage (LV) winding side is usually high, to achieve large capacities in HTS transformers, the LV winding is connected in parallel branches so that the current is divided between the branches.…”

“…In Song et al (2018), a three-phase 1-MVA HTS transformer has been simulated using the finite element method (FEM) and electromagnetic parameters, including AC losses, were calculated using the H-formulation method. Other papers have also examined one or more electromagnetic parameters in HTS transformer windings (Pardo et al, 2015;Glasson et al, 2012;Glasson et al, 2012;Glasson et al, 2016;Jiang et al, 2014;Hu et al, 2017aHu et al, , 2017bHu et al, , 2017cHu et al, , 2017dQiu et al, 2014;Sun et al, 2014;Song et al, 2019;Jiang et al, 2021).…”