Aging phenomena of paper-oil insulating system under different voltage stress

Mentlík, Václav; Trnka, Pavel; Svoboda, Michal; Hornak, Jaroslav; Totzauer, Pavel; Harvanek, Lukas

doi:10.1109/icpadm.2015.7295330

Cited by 9 publications

(1 citation statement)

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“…Insulation systems of modern electrical equipment are exposed to operational and environmental stress during operation [3], [4]. The technical lifetime of the transformer mainly depends on the thermal aging of its electric insulation system.…”

Section: Introductionmentioning

confidence: 99%

Study of the Complex Permittivity of a Polyurethane Matrix Modified by Nanoparticles

et al. 2021

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This study presents the influence of various types of nanoparticle (NP) fillers incorporated into a polyurethane (PU) (VUKOL 022) matrix and its subsequent changes in complex permittivity. Two types of surface modification of SiO 2 fillers were investigated. The frequency dependence of the real and imaginary parts of complex permittivity was measured within the frequency range of 1 mHz to 1 MHz using the capacitance method. The 1 wt.% NPs in PU caused an increase (MgO, TiO 2 , n-SiO 2 , and f-SiO 2 ) or a decrease (d-SiO 2 ) in the real permittivity. The α-relaxation and intermediate dipolar effect were observed at the temperature dependence of the imaginary permittivity. The change in permittivity by various surface modifications of SiO 2 and other nanofillers was discussed based on the multi-core model. Moreover, the NPs caused a shift in the local maximum of the permittivity, which was a result of the interfacial polarisation and a charge multiplication of the α-relaxation process.

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Section: Introductionmentioning

confidence: 99%