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The identification of defects supporting Partial Discharge (PD) phenomena in insulation systems of HV machines and components, is a fundamental requirement of any diagnostic procedure because different defect typologies can affect in different ways the insulation reliability. Once a defect is correctly identified, it can be monitored and a repair action can be planned to prevent catastrophic failures...
Evaluation of reliability, availability and capability of electric supply is left to skill and expertise of single engineers. Standardizations of single line diagrams integrated with predicted immunity of fault common causes, thanks to a faults analysis, could help to save culture of strategic aspects, spread good practice in different industrial disciplines and sectors, constitute a tool to certificate...
The design of electrical power distribution system of Marinas requires a special architecture to supply the distributed loads constituted by pleasure crafts. It must also provide for solutions to possible stray currents circulating through the earth and the water that can cause electrical hazards and corrosions. The authors suggest the adoption of a distribution operated at 1 kV and the TN-island...
The main protection against electric shock is the “active” measure based on preventing the persistence of the electrical hazards limiting the time duration of the risk exposure to the electric contact. For the electrical risk assessment, the analysis of the risk exposure is treated by an innovative approach in analogy with collisions problems. Therefore, in practice the protection against the indirect...
Here we review the possible application of carbon nanotubes and hybrid carbon/metal or metal-oxide nanostructures as chemiresistor for gas chemical sensors produced and analyzed at the Elettra Synchrotron facility. The endeavor of this paper is to understand the key facts emerging from these systems, that seem to demonstrate their high sensitivity to several molecular species, with the effort to catch...
A design and implementation of a portable functional Near InfraRed Spectroscopy embedded system prototype is described. In this theoretical and experimental work, we present an embedded system hosting 64 LED sources and 128 Silicon PhotoMultiplier detectors (SiPM). The elementary part of the structure is a flexible probe “leaf” consisting of 16 SiPMs, 4 couples of LEDs, each operating at two wavelengths,...
Temperature plays an important role on the failure rate of electrical cables and their joints as well as of any electrical components. In fact, Arrhenius's Law (1889) states that temperature accelerates any chemical reaction and, hence, it is evident that aging, or a fast degradation, of any insulating materials increases with temperature. For this reason the maximum operational temperature which...
Induction motors are presently the most widespread kind of electric machinery used in industrial and vehicle applications. In the engineering practice, it frequently happens that designers or final users have to roughly estimate the size, weight and some basic performance data of an induction motor based on few specification requirements such as its rated speed and power. This paper describes a heuristic...
The paper deals with the modeling of the magnetic materials used for electrical machines. The model proposed is able to simulate the magnetization processes of the NOG and OG steels which are usually used in the magnetic core of electrical motors, generators and transformers. For the validation of the model we present some experiments about the prediction of transformer inrush currents, in particular...
In the last years important improvements are developing in the electrical systems strong encouragements towards the energy saving and the installation of small renewable power sources. Harbor areas have to be considered as a unique territory, and new management business for electrical distribution systems have to be carried out by port authorities. The ports are required to arrange their electrical...
The paper deals with the modeling of motor drives for electric vehicles, in order to estimate their efficiency. For the experimental validation of the model, a reduced scale version of the system has been realized in our laboratory. Simulation results are compared with measured.
This paper introduces a micromagnetic model able to characterize the magnetization dynamics in three terminal magnetic tunnel junctions, where the effects of spin-transfer torque and spin-orbit torque are taken into account. Our results predict that the possibility to separate electrically those two torque sources is very promising from a technological point of view for both next generation of nanoscale...
The paper presents a project, I-ECO, Inductive Charging Station for Ebike Clever Mobility. It consists of the development of integrated high-tech components for the design and implementation of eco-friendly cycle-stations making use of inductive charging systems or so-called ‘wireless’, with integrated photovoltaic generation systems, for the' power assisted bicycles. In particular, the project aims...
This paper describes the realization of a two-degrees of freedom induction motor prototype with rotor helical motion, suitable for several industrial applications as grinders, augers, drilling and milling spindles, robotic arms and drives for medical tools and prostheses. This prototype was realized by combining a three-phase tubular linear induction motor (TLIM) with the stator of a three-phase rotary...
The finite reluctance approach is based on a simple synergy between a basic magnetic domain decomposition rule and the voltage balance at the terminals of any winding acting in the domain. The finite reluctance approach is thought as a tool for fast dynamic simulations of any kind of machine, but it is particularly adapt for irregular flux geometries as in fractional-slot surface-mounted permanent...
The effective management of several distributed devices, even in real time, is one of the mandatory conditions for the design, operation and upgrade of modern particle accelerators control systems. In order to cope with the performance demanded by such plants, the existing equipment has to be continuously improved or new strategies have to be considered to overcome its limitations. The impressive...
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