between PETs in wind power generation equipment and 50 Hz power frequency transformers is the former's higher operating frequency, usually in the range of a few kHz to tens of kHz [4]. Therefore, the bulky magnetic components of the traditional power transformers can be replaced by lighter-weight and smaller high-frequency magnetic cores, reducing the use of transformer metal materials, thus reducing the manufacturing cost of the transformer and effectively improving the power density of the device. PETs' advantages in terms of work efficiency and controllability also provide an effective guarantee for the efficient operation of wind power transmission and distribution systems. In wind farms, traditional power transformers usually require the use of the installation platform of a distribution station, whereas high-frequency transformers can be installed either in the engine room or in the base of the wind turbines; this is due to their reduced volume and weight, eliminating the need for bulky substation platforms and improving the performance of wind turbines in terms of cost, design, and maintenance [5]. A medium- and high-frequency transformer is the core piece of equipment in power electronic transformers. As the frequency increases, the loss of the medium- and high-frequency transformer core will become higher, resulting in a greater increase in the temperature of the power equipment and even damage, which shortens the equipment's service life. Because the loss characteristics between different magnetic materials will differ, in the process of designing power equipment, it is necessary to consider the influence of the core materials' magnetic properties. In one study, a new permanent magnet linear synchronous motor structure using oriented silicon steel sheets as the moving core material instead of the traditional non-oriented silicon steel sheets has been proposed, which improves the electromagnetic thrust and overload capacity [6]. Moreover, the use of grain-oriented silicon steel in axial flux permanent magnet machines improves their torque and efficiency, highlighting the advantages of grain-oriented silicon steel in the application of yokeless stator axial flux permanent magnet (AFPM) machines [7]. Using three test motors made of conventional steel, high-silicon steel, and amorphous iron, the authors of [8] proved that magnetostriction has a significant effect on amorphous iron, but an almost negligible effect on high-silicon steel. Considering the use of high-silicon steel instead of amorphous metal as a rotor can improve the mechanical strength without affecting the performance of the motor, proving the feasibility of high-silicon steel as a rotor material and its potential for large-scale production [9]. The performance of a multistage axial flux permanent magnet motor with different stator core materials has been proposed and analyzed, and the difference in the application performances of the three materials has been compared [10]. The comparative analysis, prototyping, and testing of two kinds of surface-mounted permanent magnet synchronous motors (PMSMs) with the same physical size but different stator core materials were carried out, and it was found that the additive PMSM had very low no-load iron loss characteristics [11]. Finally, the influence of a 6.5% silicon steel and a cobalt-ferro alloy, two soft magnetic materials, on the design of high-speed machines was studied in [12]. Therefore, the manufacturing of new materials and the exploration of the magnetic properties of different magnetic materials are of great significance for the application of these materials in power equipment. In this work, an Epstein square ring is used to measure the magnetic properties of 0.10 mm UTGO silicon steel at different frequencies, and the magnetic properties are compared with those of FBA alloys at different frequencies. Then, the COMSOL Mutiphysics 6.0 finite element calculation software is used to simulate the Epstein square ring.