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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 29
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...

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...

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,...

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...

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&...

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...

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&...

Michal, Ondřej , Mentlík, Václav
Area density of polyimide nanofibers and its influence on the properties of epoxy based nanodielectrics

Recent demands for thin and more resistant materials, that can be used in rotating machines, is causing the evolution of the new generations of materials. Conventional electroinsulating materials include a variety of composite materials, such as the combination of resin, mica and glass&...

Hornak, Jaroslav , Kubeš, Tomáš , Trnka, Pavel
Effect of nanometric oxides on dielectric and mechanical properties of epoxy resin

The main aim of this research is to present the effect of different nanostructured fillers (single metal oxides) on dielectric and mechanical properties. Silicon dioxide (SiO2), Magnesium oxide (MgO), Aluminium oxide (Al2O3), Zinc oxide (ZnO) and Titanium dioxide (TiO2) with average size...

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...

Netolický, Petr , Kupka, Lukáš , Tůmová, Olga
Analysis of a measurement process in the field of variability

The paper deals with the analysis of a measurement process in the field of the variability in the measurement process. In the beginning it defines some variability sources in the measurement process, more precisely in the measurement process setting. These variability sources are t...

Šlauf, Josef , Pavec, Martin , Řeboun, Jan
Orientation of carbon nanotubes using electric field for applications of electrochemical sensors

This paper describes an initial experiment involving the action of an electric field on carbon nanotubes (CNTs). The spatial orientation of nanotubes is assumed due to the influence of electric field. An arrangement of nanotubes could provide better sensor properties of carbon nanotubes...

Kalčík, Jan , Kalaš, David , Suchý, Stanislav , Soukup, Radek
A contact structure for the hybrid resistive embroidery threads

This publication is a follow-up to the study of an embroidered temperature sensor based on the hybrid resistive thread. It is necessary to be able to create a reliable electrical contact of the resistive thread by techniques which will be suitable for textile series production...

Steiner, František , Hirman, Martin , Rous, Pavel , Hornak, Jaroslav
Influence of production and operating conditions on properties of acrylic conformal coatings

This article presents a research focused on a conformal coating used for printed circuit board (PCB) protection. Conformal coatings are an integral part of electronic assemblies to increase resistance to the effects of harmful environments and to improve reliability. An experiment for i...

Hirman, Martin , Navrátil, Jiří , Steiner, František , Hamáček, Aleš
Reliability of glued SMD components on smart textile

The paper deals with temperature ageing reliability of joints glued by non-conductive adhesive (NCA) onto the conductive ribbon. The samples prepared with NCA were accelerated aged at 85°C temperature for 1000 hours. The samples were also stretched on 150% of their relaxed length d...

Blecha, Tomáš , Moravcová, Daniela
Planar textile transmission lines

This paper deals with the design and realisation of planar transmission lines on the textile substrate. Many types of different planar transmission lines are known very well and are commonly used for connection of electronics components, electronic equipment, and system. Currently, there...

Michal, David , Suchý, Stanislav , Moučková, Kateřina , Řeboun, Jan
Parameters of tensiometric textile threads based on material composition

The range of available materials to be used in the field of Smart textile is vast, but not thoroughly analysed in depth. This paper presents analysis and testing of textile materials suitable for tensiometric functioning in Smart textile applications. The research was focused on&#x...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 29