Vol. 62 | no. 3 | July - September 2014 Article 10

Ageing of Transformer Ferrofluid Oil as to Capacitance in Frequency Domain at Initial Stage of Ageing
(full text in English)

Roman CIMBALA, Jozef KIRÁLY, Martin GERMAN-SOBEK
Abstract
The article deals with thermal ageing of transformer oil based ferrofluid at initial stage of ageing. Influence of ageing is observed on changes of electric capacitance, whose represents structural changes in liquid insulation. For a better evaluation are all experiments made in frequency range from 100 Hz to 2 MHz. Except the influence of frequency on capacitance of these samples, it have to be noted that concentration of magnetic nanoparticles in these fluids, which also affects capacitance of samples.
Keywords: magnetic fluid, transformer oil, thermal ageing, oleic acid

 

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