Evaluation of Errors of the Wattmeter Method for Determining Magnetic Losses in Transformers

2021 ◽  
Author(s):  
S. M. Plotnikov
Keyword(s):  
Magnetic Losses

scholarly journals The temperature dependence of magnetic losses in CoO-doped Mn-Zn ferrites

2019 ◽  
Vol 126 (14) ◽  
pp. 143902 ◽  
Author(s):  
Cinzia Beatrice ◽  
Samuel Dobák ◽  
Vasiliki Tsakaloudi ◽  
Carlo Ragusa ◽  
Fausto Fiorillo
Keyword(s):  
Temperature Dependence ◽  
Magnetic Losses

Losses in ac of BSCCO-2223 superconducting monofilament and multifilament tapes at power frequencies

1997 ◽  
Vol 12 (11) ◽  
pp. 3085-3089
Author(s):  
S. Mench ◽  
M. Lelovic ◽  
T. Deis ◽  
N. G. Eror ◽  
U. Balachandran ◽  
...  
Keyword(s):  
Eddy Current ◽  
Anisotropy Field ◽  
Magnetic Losses ◽  
Field Orientation ◽  
Eddy Current Losses ◽  
Order Of Magnitude

The ac magnetic losses at power frequencies (60 Hz) were investigated for mono- and multifilament Ag-sheathed (Bi, Pb)2Sr2Ca2Cu3Oy (BSCCO-2223) tapes with similar Ic values at 77 K. The multifilament sample exhibited higher losses than the monofilament under the same conditions. Loss peaks are discussed in terms of intergranular, intragranular, and eddy current losses. Because of BSCCO's anisotropy, field orientation has a large effect on the magnitude of these peaks, even at relatively small angles. Losses for fields applied parallel to the c-axis of the textured BSCCO grains are larger by over an order of magnitude than those applied perpendicular.

ON THE EFFECT OF GRAIN SIZE ON MAGNETIC LOSSES OF 3% NON-ORIENTED SiFe

1985 ◽  
Vol 46 (C6) ◽  
pp. C6-385-C6-388 ◽  
Author(s):  
G. Bertotti ◽  
G. Di Schino ◽  
A. Ferro Milone ◽  
F. Fiorillo
Keyword(s):  
Grain Size ◽  
Magnetic Losses

Magnetic losses in V2Zr and V2Hf laves phase compounds

1985 ◽  
Vol 88 (2) ◽  
pp. 575-585 ◽  
Author(s):  
J. Sosnowski ◽  
K. Kuentzler ◽  
R. Clad
Keyword(s):  
Laves Phase ◽  
Magnetic Losses ◽  
Laves Phase Compounds

Magnetic losses versus sintering treatment in Mn-Zn ferrites

2017 ◽  
Vol 429 ◽  
pp. 129-137 ◽  
Author(s):  
Cinzia Beatrice ◽  
Vasiliki Tsakaloudi ◽  
Samuel Dobák ◽  
Vassilios Zaspalis ◽  
Fausto Fiorillo
Keyword(s):  
Magnetic Losses

scholarly journals Enabling highly efficient and broadband electromagnetic wave absorption by tuning impedance match in high-entropy transition metal diborides (HE TMB2)

2021 ◽  
Author(s):  
Weiming Zhang ◽  
Fu-Zhi Dai ◽  
Huimin Xiang ◽  
Biao Zhao ◽  
Xiaohui Wang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Transition Metal ◽  
Impedance Match ◽  
Magnetic Losses ◽  
High Entropy ◽  
Wave Absorption ◽  
Highly Efficient ◽  
Absorbing Materials ◽  
Metal Diborides ◽  
Transition Metal Diborides

AbstractThe advance in communication technology has triggered worldwide concern on electromagnetic wave pollution. To cope with this challenge, exploring high-performance electromagnetic (EM) wave absorbing materials with dielectric and magnetic losses coupling is urgently required. Of the EM wave absorbers, transition metal diborides (TMB2) possess excellent dielectric loss capability. However, akin to other single dielectric materials, poor impedance match leads to inferior performance. High-entropy engineering is expected to be effective in tailoring the balance between dielectric and magnetic losses through compositional design. Herein, three HE TMB2 powders with nominal equimolar TM including HE TMB2-1 (TM = Zr, Hf, Nb, Ta), HE TMB2-2 (TM = Ti, Zr, Hf, Nb, Ta), and HE TMB2-3 (TM = Cr, Zr, Hf, Nb, Ta) have been designed and prepared by one-step boro/carbothermal reduction. As a result of synergistic effects of strong attenuation capability and impedance match, HE TMB2-1 shows much improved performance with the optimal minimum reflection loss (RLmin) of −59.6 dB (8.48 GHz, 2.68 mm) and effective absorption bandwidth (EAB) of 7.6 GHz (2.3 mm). Most impressively, incorporating Cr in HE TMB2-3 greatly improves the impedance match over 1–18 GHz, thus achieving the RLmin of −56.2 dB (8.48 GHz, 2.63 mm) and the EAB of 11.0 GHz (2.2 mm), which is superior to most other EM wave absorbing materials. This work reveals that constructing high-entropy compounds, especially by incorporating magnetic elements, is effectual in tailoring the impedance match for highly conductive compounds, i.e., tuning electrical conductivity and boosting magnetic loss to realize highly efficient and broadband EM wave absorption with dielectric and magnetic coupling in single-phase materials.

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