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The microstructure and some magnetic properties of the nanocrystalline Fe76−xCu1NbxSi13B10 (x = 2 or 3) alloys obtained by one-step or two-steps annealing of amorphous ribbons (at 830 K for 30 min or at 660 K for 30 min and then at 830 K for 30 min, respectively) were investigated. Using the core made of the nanocrystalline Fe73Cu1Nb3Si13B10 alloy, the single-phase transformer of 40 kVA power for operation in the rail static converter has been designed. Until now used transformers have 3C95-type ferrite cores due to very low losses and almost noiseless operation. An application of the nanocrystalline material as a core is an alternative solution because the mass of the transformer will be significantly reduced maintaining low losses and an acceptable level of the noise around the transformer.

Modification of Nanocrystalline Fe-Cu-Nb-Si-B Alloys and Their Applications as Magnetic Cores in Rail Power Transformers