Giant Barrier Layer Capacitance Effects in CaCu3Ti4O12 Ceramics.
Abstract For Abstract see ChemInform Abstract in Full Text.
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Multifactor-surface-tests of organic insulating materials in the early stage of degradation
Ageing due to multifactor stresses of the surface of organic materials has to be divided into two different stages named "early" and "late" stage of ageing. While standardized tests such as the inclined plane test or the rotating wheel dip test aim at verifying only the performance of insulating materials in the late…
Partial discharge diagnostics for DC equipment
Partial discharges (PD) are an indication of weak spots in the insulation of DC high voltage equipment. For AC equipment, classification of the type of defect can be achieved if statistical tools are used on the PD phase distributions. In this paper, the authors propose the use of a similar technique for classificatio…
Aging of XLPE cable insulation under combined electrical and mechanical stresses
Extruded crosslinked polyethylene (XLPE) insulation is widely used in high-voltage cables since it presents such attractive features as excellent dielectric properties and good thermomechanical behavior. However, its performance is affected by long-term degradation when it is subjected to the various thermal, mechanic…
Accelerated environmental and electrical aging of polymer insulators
Experimental results of accelerated aging tests conducted on two types of high voltage polymeric outdoor insulators are presented. The investigated housing polymers were ethylene propylene diene monomer (EPDM) and silicone rubber (SR). The polymer performance under environmental stresses and electrical stresses were s…
Heat capacity of SrFeO3–δ; δ = 0.50, 0.25 and 0.15 – configurational entropy of structural entities in grossly non-stoichiometric oxidesElectronic supplementary information (ESI) available: the experimental molar heat capacities of SrFeO2.54, SrFeO2.725 and SrFeO2.833 at sub-ambient temperatures and the corresponding data for SrFeO2.50, SrFeO2.74, SrFeO2.82, SrFeO2.833 and SrFeO2.85 at super-ambient temperatures. See http://www.rsc.org/suppdata/dt/b2/b209236k/
The heat capacity of SrFeO3−δ; δ = 0.50, 0.25 and 0.15 has been determined for 10 < T/K < ≈ 800 K by adiabatic calorimetry. The total heat capacity has been analysed and the entropy of the magnetic and structural order–disorder transitions derived. The excess heat capacity of SrFeO2.50 relative to the mixture of the b…
Dielectric properties of sol-gel derived ZnO thin films
Sol-gel derived ZnO thin films were prepared on platinized Si wafers and fired to temperatures ranging from 550C to 700C. Multiple spincoating was performed with an intermediate firing at 400C between coatings to obtain films up to 6000 A thick. Top Pt electrodes were sputtered to form monolithic capacitors. Dielectri…
Intercalation Compounds of Graphite
Abstract For Abstract see ChemInform Abstract in Full Text.
Classification of partial discharges for DC equipment
Computer aided partial discharge detection, recognition and classification at AC voltage has become common practice in recent years. Characteristic discharge phase distributions have been found, thus providing the possibility to recognise and assess possible defects in HV apparatus. For diagnostic purposes, fingerprin…
Microcontroller-based switch for three-phase transformer inrush current minimization
This paper presents a novel method for the minimization of three-phase transformer inrush current in the case of sustained switching-on operations. First, a simple mathematical model of the three-phase transformer was derived taking the residual flux and the switching-on instant into consideration. A table of optimum…
Leakage current performance of naturally aged non-ceramic insulators under a severe marine environment
The leakage current and material performance of various naturally aged nonceramic distribution class insulators, referenced to glass cap and pin insulators, are presented and discussed. The insulators were energised under a severe marine environment for a period of six months, on a 22 kV insulator test rig situated at…
Protoporphyrin IX Zinc(II) Organization at the Air/Water Interface and Its Langmuir−Blodgett Films
Protoporphyrin IX zinc(II) (ZnPP) and its mixtures with N -hexadecylethylenediamine, hexadecyltrimethylammonium bromide, and didodecyldimethylammonium bromide in a molar ratio of 1:2 were used to investigate the Langmuir monolayer and Langmuir−Blodgett (LB) film behaviors. The well-defined Langmuir monolayers were for…
Intramolecular Excimer Formation in a Naphthalene-Appended Dinuclear Iron−Oxo Complex
The synthesis, structure, and physical properties of a Heisenberg exchange-coupled cluster containing naphthalene groups are described. [Fe2(O)(O2CCH2C10H7)2(TACN-Me3)2]2+ (3) crystallizes in space group P1 with unit cell parameters a = 12.94(2) A, b = 14.84(2) A, c = 15.23(2) A, alpha = 101.12(7) degrees, beta = 90.8…
Anhydrous tris(dibenzoylmethanido)( o -phenanthroline)europium(III), [Eu(DBM) 3 (Phen)]
The hydrated tris(dibenzoylmethanido)(o-phenanthroline)europium(III) complex, [Eu(DBM)3(Phen)]·xH2O, is converted efficiently into anhydrous tris(dibenzoylmethanido)(o-phenanthroline)europium(III), [Eu(DBM)3(Phen)] or [Eu(C15H11O2)3(C12H8N2)], by heating under vacuum. The title compound has been characteriz…
Patterning of Narrow Au Nanocluster Lines Using V2O5 Nanowire Masks and Ion-Beam Milling
A shadow mask technique employing V 2 O 5 nanowires and ion-beam milling is used to define narrow lines of monolayer-encapsulated Au nanoclusters. When positioned between electrodes these lines are shown to be conducting and to have nonlinear I−V characteristics with nonzero threshold voltages consistent with Coulomb…
A proposed type test for interturn insulation in multi-turn coils
Stator insulation failures are a significant cause of forced outages of electrical machines. Accelerated aging tests or type tests have been developed and are now applied routinely to groundwall insulation in coils and bars used in machines to ensure satisfactory life time performance. It is generally accepted that ma…
RadScan 600-a portable instrument for the remote imaging of gamma contamination: its design and use in aiding decommissioning strategy
BNFL Instruments RadScan 600 has been developed to allow the remote surveying of gamma radiation in a wide variety of environments. The device is based on a CsI crystal located in a tungsten collimator and is capable of detecting gamma rays with energies between 100 keV and 10 MeV. A colour CCD camera produces a visua…
Measurement of space charge distribution in XLPE cable using PEA system with flat electrode
The Pulsed Electro-Acoustic (PEA) method has been used for the measurement of space charge distribution in solid dielectric films or cable shape samples. However, the PEA system for cable shape samples had a curved surface electrode, which had the same radius curve to the outer radius of the sample cable. Therefore, i…
The Westinghouse solid oxide fuel cell program-a status report
A MW-class, commercial prototype Westinghouse tubular solid oxide fuel cell (SOFC) power plant is being developed for demonstration by the end of this decade. A 5 MW integrated SOFC/combustion turbine power plant design for distributed power applications is shown which can achieve an efficiency approaching 70%. The re…
Experience with an on-line monitoring system for 400 kV XLPE cables
The use of high voltage cables is today recommended and sometimes mandatory in order to avoid environmental concerns of the public, especially when the power system crosses areas of dense population. The reunion of the former GDR with the Federal Republic of Germany has stimulated the interest in this settlement espec…