Materials Literature
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This work presents a study of the sensitivity of some parameters in magnetic components and their influence on the value of their parasitics. The influence of the insulator thickness, the effect of the air gap, the window height and the variation of the value of the capacitive effects as a consequence of the coil-form…
The title compound, caesium aluminium dimolybdate(VI), CsAl(MoO4)2, belongs to the glaserite type family of double molybdates and tungstates. The crystal structure was studied by in situ X-ray single-crystal and powder diffraction at room temperature. The temperature dependence of the lattice parameters at low tempera…
A study of several configurations used to construct low-profile transformers is presented. Finite-element analysis is used to analyze the behavior of transformer current at high frequency and determine an appropriate winding configuration with low AC-resistance and leakage inductance. It is demonstrated that the foil…
A highly-reliable ferroelectric memory (FeRAM) which ensures retention of data written at a low voltage of 2.5 V and humidity resistance for 10 years under a high temperature of 70/spl deg/C has been successfully developed for the first time. These excellent characteristics have been attained by a newly developed ferr…
Electrical breakdown in high voltage cable insulation is correlated with the presence of a space charge. Beside experimental characterisation, physical and phenomenological modelling, an alternative approach is proposed, based on recent developments in computational chemistry, which can give information on each indivi…
The paper discusses the role and the significance of the radionuclide thermoelectric generators in space power researches while using them as reliable long-life service autonomous sources of power and heat supply. There are considered approaches connected with the RTG design and the provision them with the radiation s…
The reliability of the power supply can be significantly improved by modifying the electric motors' re-acceleration scheme. It will mitigate the affect of lengthy and simultaneous acceleration by staggering the high inrush current demand. Transient simulations were performed at an integrated petrochemical facility to…
This paper presents a shape memory alloy (SMA) actuator aimed to be integrated in the phalanx of a dexterous micro-gripper. Its original design mechanically decouples motion transmission from force transmission. After a brief discussion on the operating principles of the actuator, the kinematics of the mechanism and i…
HVDC components for both energy (HVDC submarine cables) and non-energy (X-ray equipment, television screens, travelling wave tubes) applications can successfully be tested for partial discharges (PD). Contrary to the situation for ac equipment that is used for the electrical energy supply (IEC270), no detailed PD test…
Increased switching frequencies in magnetic components have resulted in renewed attention to the problem of proximity effect losses in layered transformer windings. The ideal situation is to design at the point of minimum AC winding resistance. This paper provides a unified approach which gives exact AC resistance for…
Several types of hot-line diagnostic methods for XLPE power cables are used in Japan. However, these methods have some problems. On this account, we have successfully developed a new hot-line diagnostic method, call "AC superposition method". In this paper, we introduce the fundamental characteristics of the new metho…
High voltage cables that are used for DC transmission are subjected to a range of operating conditions. The resulting distribution of the electric field inside the cable is highly dependent on, for instance loading of the cable and polarity reversals. This is because the conductivity of the insulation is dependent bot…
Oriented lead zirconate-titanate (PZT) thin films have been deposited on silicon substrates by pulsed laser technique and tested in transducer structures. The deposition has been performed in a vacuum chamber in oxygen atmosphere, by using a pulsed Nd-YAG laser of wavelength 1064 nm. The targets have been PZT sintered…
The performances of Peltier cooling depend first of all, on the thermoelectric properties of the thermoelectric (TE) materials and secondly on the thermal design. A survey will be given of present and future TE materials, bulk and thin film. The technologies of manufacturing the materials and of manufacturing TE modul…
Results of measurements and analyses of leakage current (LC) patterns on field-aged and non-aged insulators are presented. The field-aged insulators were exposed to marine and industrial pollutions as well as to tropical weather conditions for one year. The LC measurements were performed on them under natural and arti…
Since 1960, polymer insulator has been employed as an outdoor insulator for high voltage ascribed to its excellent aging characteristics compared to those of ceramic insulator. However, in spite of various investigations related to the polymer insulator, its aging mechanism due to acid rain have not been well elucidat…
This paper describes the influence of high voltage harmonics on partial discharge (PD) phase resolved images. The evolutions of these images as a dependency of total harmonic distortion (THD) parameter as an assessment factor, calculated by means of Fast Fourier Transform (FFT) are shown.
Following an initial elastic strain, a crystal responds to an increasing external stress by either breaking up into pieces, or else plastically changing its shape before failure. In this paper, the different behaviours of a crystal—brittle cleavage versus ductile deformation—are briefly discussed, and the transition f…
A description is given of a straightforward physical model, which is based on only a few physically meaningful parameters and that allows to describe the PD behaviour resulting from specific insulation defects. It is demonstrated that computer simulations of PD pulse sequences on the basis of this model correspond clo…
The determination of the thermal conductivity of thin films is of great interest both for understanding the structure and conduction mechanism and for numerous technical applications of these films. The thermal conductivity /spl lambda/ is a crucial term of the thermoelectric figure of merit z=/spl alpha//sup 2//spl s…