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Application of the cut‐off resonator for microwave monitoring of transformer oil
Author(s) -
Kapilevich Boris,
Lipsky Anatoly,
Litvak Boris
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25630
Subject(s) - transformer , microwave , resonator , transformer oil , tangent , electrical engineering , materials science , engineering , dissipation factor , insertion loss , acoustics , petroleum engineering , telecommunications , mathematics , physics , dielectric , voltage , geometry
This paper describes a cut‐off resonator designed for testing transformer oil is proposed.The two kinds of transformer oil have been compared—“fresh” (unused) and “old” (used) for a long period in real‐world conditions. The experimental setup has been designed and assembled on the basis of the cut‐off resonator with plastic tube containing the tested oil. There was observed the shift of resonance curves of the measured insertion losses between the “old” and the “fresh” samples. Also, the “old” oil has higher insertion loss that is caused by increasing its loss tangent compared with the “fresh” oil. These parameters can be used for estimating quality of the transformer oils. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:66–68, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25630