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Critical current and AC losses of high temperature superconducting (HTS) tapes greatly depend on the magnetic field by which they are surrounded. Moreover, because of the anisotropic properties of the HTS tapes, the influence of the radial component of the leakage field on critical current and AC losses is much heavier than that of the axial one, so a leakage magnetic field in HTS transformer design...
In HTS transformer the ampere-turn distribution of the windings is usually made lower density than in the conventional transformer for decreasing the magnetic field. Moreover, in our study the secondary winding, different from the primary which is pancake, is chosen helical for cutting down the circulating current among the branches. So there is a difference of magnetomotive force at the same height...
A conceptual design of a 3000 kVA high-temperature superconducting (HTS) transformer with split types of windings for locomotives is developed in this paper. The primary winding of it has four coils which are arranged on two core limbs respectively and connected in parallel, so the branch currents are probably not equal to each other. In this paper, on the basis of the 3-D magnetic field analysis...
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