Title :
Dielectric spectroscopy of transformer oil based ferrofluid from view of i(t) characteristics at initial stage of ageing
Author :
Cimbala, Roman ; Kiraly, Jozef ; German-Sobek, Martin ; Pavlik, Marek
Author_Institution :
Dept. of Electr. Power Eng., Tech. Univ. of Kosice, Kosice, Slovakia
Abstract :
The article deals with thermal ageing of transformer oil based ferrofluid at initial stage of ageing. Influence of ageing in this article observes changes caused by polarization current, which triggers structural changes in liquid insulation. Except the influence of ageing of polarization current on these samples it has to be noted, that concentration of magnetic nanoparticles in these fluids can also affects capacitance of samples. This assumption is confirmed in article.
Keywords :
magnetic fluids; transformer oil; capacitance; dielectric spectroscopy; ferrofluid; liquid insulation; magnetic nanoparticles; polarization current; thermal ageing; transformer oil based ferrofluid; Aging; Dielectrics; Magnetic domains; Magnetic field measurement; Magnetic fields; Nanoparticles; Power transformers; dielectric relaxation spectroscopy; ferrofluid; magnetodielectric anizotropy; polarization current; transformer oil;
Conference_Titel :
Electric Power Engineering (EPE), Proccedings of the 2014 15th International Scientific Conference on
Conference_Location :
Brno
DOI :
10.1109/EPE.2014.6839485
