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Measurement performance evaluation is important, because measurement results depend usually on the method used for measurement. The analysis of the repeatability has to be made under some exact conditions: the same measurement procedure, observer, measuring instruments. Also using the same laboratory and conditions, the measurements must be repeated over a short period of time. Usually, repeatability...
Nowadays great efforts are done in order to improve the performance of soft magnetic materials due to their wide use in industrial applications. This paper deals with a comparative analysis of the influence of the alloying elements on magnetic properties of several grades of electrical steels. The magnetic characteristics are obtained in the sinusoidal magnetization regime at low frequency, of 1 Hz,...
The international guidelines (including European Directive 2013/35/EU) set out limits for limb contact currents in the frequency up to 110 MHz, in order to protect workers against the indirect effects of exposure to electromagnetic field. The aim of the study was to analyse the practical role of that kind of metric for an evaluation of the electromagnetic hazards at the workplace. For the practical...
This paper describes the magnetic field measurements performed in a public access area — a market place, situated in the close vicinity of a transformer substation part of the Romanian national power grid. The measurement results were compared to the limits, regarding the human exposure to electromagnetic fields, imposed by normative documents. An analytical simplified estimation was performed too...
Achieving mathematical model and simulation is essential in the design of complex installations. This allows analysis of different operating modes and behavior evaluation system. This enables notification of possible errors and their correction, avoiding additional costs involved in achieving and testing facility in real conditions. Some operating modes may be degraded modes would be very difficult...
In this paper is developed a flexible virtual instrument using LabVIEW for relative humidity measurement. The resulting virtual instrument eliminates the disadvantages of traditional measuring instruments whose functions cannot be changed by the user according to their needs, predefined by the manufacturer. Data acquisition interface (virtual instrument) was made in LabVIEW and give user the possibility...
The Distributed Generation (DG) systems of today face a multitude of problems, among which the pollutant emissions and the energy efficiency play a key role. In this sense, the study of optimal operation strategies for such systems becomes highly important. Thus, the purpose of this work will be to investigate using the Nondominated Sorting Genetic Algorithm II (NSGA II) the operation of a 4 gas microturbine...
This paper is concerned with the study of electrical contacts between the components used in building key parts of high temperature superconducting (HTS) electromagnets, e.g., HTS coils, HTS current leads, etc. Some preliminary tests on two types of junctions are presented, Cu — HTS and HTS — HTS, and some details of their manufacturing process are shown. Experimental and numerical results on the...
This paper presents numerical simulation results of a passive magnetic bearing (PMB) used in Flywheel Energy Storage Systems FESS. The magnetic design, the modal analysis, aimed to outline the first six eigenmodes, and a kinetic analysis for the PMB with and without radial eccentricity are presented. These methods and results are valuable in the design phase of the PMB, for sizing its main parameters.
This work deals with the numerical analysis of the electromagnetic field problem for one proposed Ferrite — Cored Eddy Current Sensor, using the Quick Field software; this sensor can be used in the waste management for metal separation. Using this software, many specific cases are analysed, namely, when sensor probe coil is placed on different types of metallic samples (ferromagnetic and non ferromagnetic);...
This paper proposes a solution for crimped connection temperature measurement using data acquisition system NI PCI 6221, LabVIEW and thermocouple. The solution offers a modern alternative to traditional temperature measurement systems: a flexible virtual instrument with the advantages of changing the functionality by the users according to their needs. Virtual instrument was design in LabVIEW and...
This paper presents a case study for monitoring the quality of electric energy in an industrial consumer. The measurements were carried in the power supply point and the data processing was achieved using LabVIEW software. It was made an interface to allow reading of files and processing them (creation of data tables and charts). Based on the data obtained from the measurements and using the interface...
This paper is concerned with the implementation of the Fryze-Buchholz-Depenbrock theory in the control of an active DC-traction substation. The active DC-traction substation taken into consideration is obtained by adding a specific system for active filtering and regeneration to a classical DC-traction substation with twelve-pulse uncontrolled rectifier. The main component is a voltage source inverter-based...
The article presents an industrial application from a plant regarding the automatic movement of some trucks transporting building materials from one sector to another. It presents an alternative solution to conventional control installation of trucks (with electromechanical relays, timers) with a modern control installation made with PLC, static frequency converter, and touch panel.
Nowadays the development of electric and electronic equipment with applications in industry, medicine, and telecommunications or in outer space imposes the new requirements regarding the reduction of the risk of the electrostatic discharges occurrence. New researches have been developed to obtain polymeric compounds as answer to this demand and new multifunctional polymeric compounds with antistatic...
In a world of continuous changes, environmental protection and energy conservation are becoming real concerns. The development of renewable energy technology has taken on an accelerated pace to fulfill these needs. Wind energy conversion has been considered to be one of the most promising renewable energy, owing to its fast developing technology. In the present paper, three-phase 12/8 switched reluctance...
The paper presents the energetic performances of a system used for drying of current transformer from 110 kV Ciungetu power station. In fact, the drying process is based on an induction heating system that contains a half-controlled rectifier and a voltage source inverter that operates with resonant load. Two frequencies are taken into consideration for the inverter control. The former is the resonance...
This paper reflects the evolution from the 2D to the 3D finite element analysis of the squirrel-cage induction motors related to the evaluation on the influence of the broken bar fault and the investigation of methods for the efficient fault detection. Based on the scalar 3D formulation of the electromagnetic field and through the step by step in time domain finite element solution, the time dependence...
Achieving a high-level of stability represents one major concern in autonomous microgrids (MGs) with high penetration levels of renewable energy sources. The aim of this paper is to study how photovoltaic (PV) power plants can provide dynamic frequency support in an MG, in order to obtain an improved stability for the entire power system. On the PV side an energy storage subsystem is added, which...
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