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Silicone Composite Insulators

Author: Konstantin O. Papailiou
Publisher: Springer Science & Business Media
ISBN: 3642153208
Size: 44.99 MB
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Composite insulators have been in service in electric power networks successfully for more than 40 years, and now up to the highest operating voltages. The present book extensively covers such insulators with a special focus on today’s prevalent material, which is silicone rubber. It includes a detailed description of the electrical and mechanical characteristics of composite insulators, their material properties, their design as well as typical applications and service experience. Particular attention is given to the mechanical behavior of long rod and post insulators, insulated cross-arms, interphase spacers and hollow core apparatus insulators. The state of the art on manufacturing procedures and the selection and dimensioning of the necessary power arc and corona fittings is presented as well as evaluation tests of “old” insulators, i.e. insulators after many years in service. The closing chapter deals with an up to date overview of test procedures and IEC standards. The selection and the contents of the various subjects covered in this book are based on the authors’ more than thirty years of experience with a renowned European manufacturer of composite insulators and string hardware. Their long and active participation in the relevant CIGRE and IEC working bodies adding to this experience. This book is therefore addressed to practicing engineers from electric utilities and the industry, as well as to academic professionals.

Electrical Conductivity In Polymer Based Composites

Author: Reza Taherian
Publisher: William Andrew
ISBN: 012812542X
Size: 78.99 MB
Format: PDF, Kindle
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Electrical Conductivity in Polymer-Based Composites: Experiments, Modelling and Applications offers detailed information on all aspects of conductive composites. These composites offer many benefits in comparison to traditional conductive materials, and have a broad range of applications, including electronic packaging, capacitors, thermistors, fuel cell devices, dielectrics, piezoelectric functions and ferroelectric memories. Sections cover the theory of electrical conductivity and the different categories of conductive composites, describing percolation threshold, tunneling effect and other phenomena in the field. Subsequent chapters present thorough coverage of the key phases in the development and use of conductive composites, including manufacturing methods, external parameters, applications, modelling and testing methods. This is an essential source of information for materials scientists and engineers working in the fields of polymer technology, processing and engineering, enabling them to improve manufacture and testing methods, and to benefit fully from applications. The book also provides industrial and academic researchers with a comprehensive and up-to-date understanding of conductive composites and related issues. Explains the methods used in the manufacture and testing of conductive composites, and in the modeling of electrical conductivity Contains specialized information on the full range of applications for conductive composites, including conductive adhesives or pastes Brings scientists, engineers and researchers up-to-date with the latest advances in the field

Electrical Engineer S Reference Book

Author: M. A. Laughton
Publisher: Newnes
ISBN: 9780080523545
Size: 20.44 MB
Format: PDF
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For ease of use, this edition has been divided into the following subject sections: general principles; materials and processes; control, power electronics and drives; environment; power generation; transmission and distribution; power systems; sectors of electricity use. New chapters and major revisions include: industrial instrumentation; digital control systems; programmable controllers; electronic power conversion; environmental control; hazardous area technology; electromagnetic compatibility; alternative energy sources; alternating current generators; electromagnetic transients; power system planning; reactive power plant and FACTS controllers; electricity economics and trading; power quality. *An essential source of techniques, data and principles for all practising electrical engineers *Written by an international team of experts from engineering companies and universities *Includes a major new section on control systems, PLCs and microprocessors

Loss And Recovery Of Hydrophobicity Of Polydimethylsiloxane After Exposure To Electrical Discharges

Author: Henrik Hillborg
Publisher: GRIN Verlag
ISBN: 3656137927
Size: 44.45 MB
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Doktorarbeit / Dissertation aus dem Jahr 2001 im Fachbereich Chemie - Biochemie, KTH Royal Institute of Technology, Sprache: Deutsch, Abstract: Silicone rubber based on polydimethylsiloxane is used as high voltage outdoor insulation, due to its ability to preserve the hydrophobic surface properties during service, and even regain hydrophobicity after exposure to electrical discharges. The underlying processes for the hydrophobic recovery are diffusion of low molar mass siloxanes from the bulk to the surface and reorientation by conformational changes of molecules in the surface region. Only little is known of which factors are responsible for the long-term stability of this hydrophobic recovery. It is therefore important to increase the knowledge about the fundamental mechanisms for the loss and recovery of hydrophobicity of silicone rubbers, exposed to electrical discharges. Addition-cured polydimethylsiloxane networks, with known crosslink densities, were exposed to corona discharges and air/oxygen-plasma and the loss and recovery of hydrophobicity was characterised by contact angle measurements. The degree of surface oxidation increased with increasing exposure time with a limiting depth of 100- 150 nm, as assessed by neutron reflectivity measurements. The oxidation rate increased with increasing crosslink density of the polymer network, according to X-ray photoelectron spectroscopy. Within the oxidised layer, a brittle, silica-like top-layer was gradually developed with increasing exposure time. The hydrophobic recovery following the corona or air/oxygen- plasma exposures occurred at a slow pace by diffusion of cyclic oligomeric dimethylsiloxanes through the micro-porous but uncracked silica-like surface layer, or at a much higher pace by transport of the oligomers through cracks in the silica-like layer. The oligomers were present in the bulk, but additional amounts were formed during exposure to corona discharges. In addition high-temperature vulcanised silicone rubber specimens were aged in a coastal environment under high electrical stress levels (100 V/mm). The changes in surface structure and properties were compared to the data obtained from specimens exposed to corona discharges/plasma. The dominating degradation mechanism was thermal depolymerisation, initiated by hot discharges. This resulted in the formation of mobile siloxanes, of which the low molar mass fraction consisted of cyclic oligomeric dimethylsiloxanes. Oxidative crosslinking resulting in silica-like surface layers was not observed during these conditions.

Silikon Verbundisolatoren

Author: Konstantin O. Papailiou
Publisher: Springer-Verlag
ISBN: 3642238149
Size: 65.47 MB
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In dem Buch stellen die Autoren das Thema Silikon-Verbundisolatoren umfassend dar. Sie beschreiben die mechanischen und elektrotechnischen Grundlagen, berücksichtigen neueste Entwicklungen und gehen auf alle wesentlichen Aspekte ein: von der Auswahl der Werkstoffe über die Dimensionierung bis zur Anwendung in Hochspannungsnetzen. Die Autoren sind Pioniere auf dem Gebiet der Verbundisolatoren und legen höchsten Wert auf die Praxisrelevanz ihres Wissens. So eignet sich der Band als Einführung in das Thema ebenso wie als Nachschlagewerk für die Praxis.