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MTJ current sensors have broad prospects in the large scale distributed monitoring of the smart grid. In this paper, we researched the design and optimization of magnetic ring for MTJ current sensors to suppress the susceptibility of the spatial position. The specific improvement and parameters of magnetic ring were also researched.
Finemet alloys exhibit superior soft magnetic properties with high initial permeability (μ), low coercivity and low core loss, which attracted a great deal of attention [1]. However, their application is limited to the temperature close to the Curie point of an amorphous matrix, Tcam, because the intergranular magnetic coupling is usually interrupted by the paramagnetic amorphous matrix. As the result,...
Ferromagnetic electrodes with perpendicular magnetic anisotropy (PMA) have been extensively studied because of the outstanding performance in applications. [1] To obtain high tunneling magnetoresistance (TMR), researchers have put efforts to realize PMA with Co-based full-Heusler alloy films with MgO barrier. However, the lattice mismatch between MgO and full-Heusler alloy leads to a rapid TMR reduction...
The DC-biased magnetization is often occurring in electromagnetic devices running process, such as the power transformer, iron core reactor and other high-voltage electrical equipment [1]. However, There are three main kinds of traditional offline measuring methods under dc-biased magnetization: Epstein Frame, Ring Test and Single Sheet Measurement. The important limitation of the three aforementioned...
Due to excellent magnetic properties, sintered Nd-Fe-B magnets have been used in various fields for many years [1, 2]. However, Nd-Fe-B magnets show a relatively low temperature stability of performance which is a main disadvantage for the application in some special cases. In order to improve the temperature stability of performance, Co, Dy and Tb elements have been added to the Nd-Fe-B sintered...
The Hefei Light Source upgrade project (HLS-II) contains 8 dipoles, 32 quadrupoles (2 spares), and 32 sextupoles (2 spares) for the storage ring. Magnets were manufactured and magnetic measurements were performed in collaboration with the Institute of High Energy Physics (IHEP), China. Magnet production and validation measurements were finished in December of 2012. Measurements for all quadrupole...
Transformer differential protection schemes normally use multi slope characteristics to provide stability during CT saturation with 2nd harmonic restraint or blocking for inrush conditions. This paper presents new algorithms that have been developed to improve the performance of the differential protection. Extensive testing has been used to demonstrate that the transient bias algorithm can reduce...
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