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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 38
Nikolić, Valentino , Kadlec, Petr , Polanský, Radek , Utrera-Barrios, Saul , Santana, Marianella Hernandez
Dielectric and thermal properties of self-healing carboxylated nitrile rubber ionically cross-linked with zinc oxide

Dielectric and thermal properties of carboxylated nitrile rubber (XNBR), ionically cross-linked with zinc oxide (ZnO), were characterized to verify its suitability for a high-voltage insulation application. Moreover, the material self-healing (SH) capabilities were assessed after dielectric strength measurement...

Kadlec, Petr , Musil, Ondřej , Nikolić, Valentino , Polanský, Radek
Effect of inhomogeneities in epoxy-glass-mica composites on conductive channel formation

Epoxy-glass-mica composites consisting of an epoxy matrix, glass fibers, and a mica paper are commonly used in insulation systems where high dielectric strength is expected. Such insulating systems are typically made from partially cured and flexible prepregs that are layered and shaped ...

Kadlec, Petr , Pihera, Josef , Prosr, Pavel , Polanský, Radek
Dielectric analysis of selected polyimide films and derived epoxy-based sandwich composites

Composites with the epoxy matrix are still the most common composites used in high voltage electrical insulation systems. Polyimides are materials with excellent heat resistance and high electrical strength for application, where high overall endurance and reliability even under harsh operating&#...

Kadlec, Petr , Polanský, Radek
Influence of fillers based on different types of tubular halloysite on dielectric properties of epoxy-based composites

The addition of tubular halloysite as a perspective type of mineral filler, even in only a few weight percent, can significantly affect the dielectric properties of base polymer. The resulting dielectric properties of the composite could also depend on the type of selected tubular&...

Hardoň, Štefan , Kúdelčík, Jozef , Hornak, Jaroslav , Trnka, Pavel , Tamus, Zoltán Adam , Koltunowicz, Tomasz
Effect of ZnO nanoparticles on the dielectric properties of polyurethane and epoxy resins

This study aims to present the influence of Zinc Oxide (ZnO) filler on the dielectric properties of two types of commercial potting compounds. For this purpose, the methods of dielectric spectroscopy were used to measure the changes in dielectric responses of polyurethane and epoxy...

Hornak, Jaroslav , Prosr, Pavel , Trnka, Pavel , Kadlec, Petr , Michal, Ondřej , Hardoň, Štefan
Effect of MgO nanoparticles on material properties of cold-curing epoxy and polyurethane mixtures

Potting compounds are an integral part of a large number of electrical devices, in which play the role of mainly mechanical or photosensitive protection. So-called cold-curing resins are one of the subgroups of potting mixtures. This article focuses on this type of potting compound...

Michal, Ondřej , Mentlík, Václav , Hornak, Jaroslav
Impact of ultrasonic mixing on the electrical properties of PEI/SiO2 nanocomposites

The usage of nanoparticles in various applications is a widely discussed topic in the science community. One of these applications is dielectrics and the proposition of nanoparticles as modification of matrix material in composites. Epoxy resins are highly used resin material. However, ...

Zemčík, Robert , Zemčík, Hana , Krystek, Jan , Kroupa, Tomáš , Pihera, Josef , Prosr, Pavel , Komárek, Josef , Friedl, Jan
Experimental tests of braided composite tubes with Kapton tape

Kapton is a material developed by DuPont company. It is commonly used for insulation of electric and electronic devices. It offers excellent, physical, electrical, thermal and chemical resistant characteristics. It is a polyimide and it is usually available in a form of a homogeneo...

Krystek, Jan , Kaňáková, Sandra , Kroupa, Tomáš , Zemčík, Robert , Zikmund, Petr , Rous, Pavel , Steiner, František , Vaňková, Tereza
Influence of position in 3D printing process on mechanical properties of metal prints

This paper researches the influence of the placement during the 3D printing process on the quality of the final product. The tensile tests were carried out on standard dog-bone specimens, which were printed both horizontally or vertically with three orientation angles 0°, 45°, 90°&...

Hirman, Martin , Navrátil, Jiří , Steiner, František , Hamáček, Aleš
Effect of washing cycles on glued conductive joints used on stretchable smart textile ribbons

The article presents a research focused on reliability testing of glued joints on conductive textile ribbons during the washing and drying cycles. For the experiment, the textile ribbons with electrically conductive silver coated copper threads were used. The SMD chip resistors were con...

Hornak, Jaroslav , Michal, Ondřej , Trnka, Pavel , Mentlík, Václav , Vuity, G. , Nouini, O. , Tamus, A.
Current and voltage response measurements on nanodielectrics

Dielectric materials are an essential part of all electrical devices. One of the reasons, their properties are studied, is that they are most impacted by internal and external influences during the lifetime of the electrical device. Composite materials are commonly used as a dielec...

Šťastný, Ladislav , Mego, Roman , Pihera, Josef , Hornak, Jaroslav
Selectivity of inductive coupling for partial discharge measurement in MV cables

The aim of this article is to verify the possibility of using inductive coupling for the on-line measurement of partial discharges MV cables. At its principle, inductive coupling records partial discharges that cause current changes over this coupling only. This natural selectivity can&...

Pihera, Josef , Kadlec, Petr , Prosr, Pavel , Polanský, Radek , Kroupa, Tomáš
Dielectric breakdown analysis of composites consisting of epoxy resin and polyimide film

The breakdown phenomena and determination of dielectric strength is one of the essential topics in the field of insulating materials for high-voltage applications. In the case of basic thermosetting plastics, including epoxy resins, dielectric breakdown analysis has been performed many times,...

Mužík, Martin , Trnka, Pavel , Hornak, Jaroslav , Michal, Ondřej , Mentlík, Václav
Compatibility of polymer materials with natural-based insulation oils

Natural oils with their price and environmentfriendly behaviour are more used these days like insulation fluids in transformers. There are often based on eg. rapeseed, soy, sunflower etc. oils. Compatibility between new materials used in transformers needs to be further discussed. Few p...

Leffler, Jan , Rauner, Ondřej , Trnka, Pavel
Comparison of two different approaches to the design of an online diagnostic system

The current trend in the field of industrial diagnostics of the electrical appliances is to lower the maintenance costs by appropriate procedures of optimization of all processes from design, manufacturing, operation to decommissioning and recycling. Online monitoring of the current state of...

Skala, Bohumil , Kindl, Vladimír , Turjanica, Pavel , Voborník, Aleš , Poláček, Libor , Štengl, Josef , Pavlíček, Vladimír , Fořt, Jiří
Intelligent high current sensor for various frequency

The paper proposes a design procedure of a current sensor. The winding design is analyzed regarding its impact on the operational characteristics and is evaluated for a preferred application. The paper also discusses the measurement results and given frequency characteristic and quality ...

Prosr, Pavel , Polanský, Radek , Pihera, Josef , Kadlec, Petr , Hirman, Martin , Krejnická, Tereza , Musil, Ondřej , Komárek, Josef , Pavlica, Richard
Effects of accelerated climatic aging on volume and surface resistivity of glass fiber reinforced thermoset composites

This paper is focused on the analysis of selected dielectric parameters stability under the conditions of selected accelerated climatic aging. This stability is analyzed for glass fiber reinforced composites with different thermosetting matrix suitable for the production of electrical insulating ...

Hirman, Martin , Navrátil, Jiří , Steiner, František , Hamáček, Aleš
Comparison of conductive ribbons reliability during electrical current ageing

This paper deals with reliability of soldered / glued joints on electrically conductive textile ribbons during the electrical current ageing. The soldering was realized with tin-bismuth solder paste by hand soldering with hot air. The gluing was realized by UV curable non-conductive...

Nikolić, Valentino , Polanský, Radek
Assessing the reliability of electrical insulating materials using accelerated againg tests

The paper summarizes the theoretical background of the accelerated aging test method of electrical insulating materials and its reliability by using the Arrhenius approach. Arrhenius equation presents generally accepted practice for assessing reliability, life-time, and degree of decomposition of a&#x...

Švarný, Jiří , Pušman, Lukáš , Turjanica, Pavel , Sýkora, Martin
Data acquisition unit for on-site diagnostics of air compressors

Based on the experience of Atmos Chrast company - a leading Czech manufacturer of the air compressors, there was initiated a development of specialized data acquisition unit for on-site diagnostics of the air compressors. The unit allows systematic and long-term monitoring of operating&...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 38