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National Repository of Grey Literature

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	Synergic effects of multistress ageing of electroinsulating materials Novák, Lukáš ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor) Submitted work deals with monitoring impact of thermal and electric ageing on the dielectric properties of insulating material NKN 0887. In the course of the experiment five sets of dielectric insulating materials were aged. The voltage range has been set from 1,5 kV till 2,2 kV and temperatures were 23 °C and 200 °C. The capacity and loss factor has been directly measured by RLC meter Agilent with attached electrode system. The electrode system operates on the principle of a plate capacitor. The values of relative permittivity and loss number has been calculated from values of capacity and loss factor. For easier confrontation has been frequency dependences of these values plotted in a chart. The Cole-Cole diagrams has been created and factors of Havriliak-Negami function has been calculated. Data has been compared with each other and the effect of ageing factors has been deduced. Detailed record
	Degradation test of polymer material in the high electric fields Čada, Miroslav ; Solčanský, Marek (referee) ; Vaněk, Jiří (advisor) This document includes summary of materials to construct and encasement solar cells and their dielectric properties. Thereinafter includes methods of testing and measuring their properties. The purpose of document is degradation tests of these materials by heat, UV radiation and monitor changes of material properties. Tested samples were prepared in cooperation with Solartec s.r.o. Detailed record
	Accelerated aging of cross-linked polyethylene cable insulation Poloni, Miroslav ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor) The present diploma thesis deals with the issue of accelerated ageing of insulation material of high voltage cables. As part of this work, two accelerated aging experiments were done. The aim of these tests is to achieve accelerated degradation of the insulation material and possibly predict the lifetime of the cables in service. Detailed record
	Accelerated aging of cross-linked polyethylene cable insulation Poloni, Miroslav ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor) The present diploma thesis deals with the issue of accelerated ageing of insulation material of high voltage cables. As part of this work, two accelerated aging experiments were done. The aim of these tests is to achieve accelerated degradation of the insulation material and possibly predict the lifetime of the cables in service. Detailed record
	Degradation test of polymer material in the high electric fields Čada, Miroslav ; Solčanský, Marek (referee) ; Vaněk, Jiří (advisor) This document includes summary of materials to construct and encasement solar cells and their dielectric properties. Thereinafter includes methods of testing and measuring their properties. The purpose of document is degradation tests of these materials by heat, UV radiation and monitor changes of material properties. Tested samples were prepared in cooperation with Solartec s.r.o. Detailed record
	Synergic effects of multistress ageing of electroinsulating materials Novák, Lukáš ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor) Submitted work deals with monitoring impact of thermal and electric ageing on the dielectric properties of insulating material NKN 0887. In the course of the experiment five sets of dielectric insulating materials were aged. The voltage range has been set from 1,5 kV till 2,2 kV and temperatures were 23 °C and 200 °C. The capacity and loss factor has been directly measured by RLC meter Agilent with attached electrode system. The electrode system operates on the principle of a plate capacitor. The values of relative permittivity and loss number has been calculated from values of capacity and loss factor. For easier confrontation has been frequency dependences of these values plotted in a chart. The Cole-Cole diagrams has been created and factors of Havriliak-Negami function has been calculated. Data has been compared with each other and the effect of ageing factors has been deduced. Detailed record

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