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Branislav Skladan, Peter Fuchs
SYSTEM FOR AUTOMATED CALIBRATION OF DIGITAL ELECTRICITY METERS

The developed calibration software for the automated calibration process of digital sampling electricity meters is described. In present, two types of electricity meters, PEM 6711 (Precise Electricity Meter) and single phase electricity meter based on mixed-signal processor TI MSP430FE427 can undergo a fully automated calibration process. Calibration laboratory with the electronic calibration station EKS 05-3, used to calibrate electricity meters, is also described and its function is explained.

R. Micheletti, R. Pieri
RATIONAL BUILDING ENERGY CONSUMPTION BY ADVANCED CONTROL TECHNOLOGIES BASED ON INSTANTANEOUS AVERAGE ACTIVE POWER MEASUREMENT

Fast and accurate measurement of the instantaneous average active power (IAAP) is useful for building Energy Management System (EMS) in order to assure quality of service such as continuity, optimize energy consumption and reduce carbon dioxide emission. In this paper the problems connected to the measurement of the instantaneous average active power for energy usage improving are discussed, also as the operational processes which deal to solve such problems.

Cesar Alberto Penz, Carlos Alberto Flesch
INFLUENCE OF STANDARD CAPACITORS ON THE QUALITY OF HIGH VOLTAGE TESTS ON ELECTRICAL ENERGY TRANSMISSION EQUIPMENTS

This article proposes and implements actions for guarantee of metrological reliability and safe conformity assessment of tested equipments when using standard capacitors. It is presented: a review on standard capacitor typical behavior and the description of an experiment for reduction the contribution on uncertainty.

Daniele Gallo, Annalisa Liccardo, Nicola Pasquino
PERFORMANCE ANALYSIS OF AN ACTIVE ENERGY INDUCTION METER USING AN INNOVATIVE APPROACH

The paper is focused on the performance analysis of an induction energy meter under different voltage and current waveforms, both sinusoidal and deformed, which resemble possible conditions of supply network encountered during normal operation. The measurement test bench and the experimental plan are presented. Experimental results are compared to a reference watthour meter, and the relative error is characterized in terms of dependence on input quantities.

Wieslaw Barwicz, Andrzej Podgórski, Serghei Duminov, Roman Z. Morawski
NEW PRINCIPLE OF ACOUSTIC CALIBRATORS DESIGN

A new principle of acoustic calibrators design, based on the use of a microprocessor in the control loop of the calibrator, is presented. The mechanical and functional features of the calibrator using this principle are briefly described, and its technical specification is given. The applied algorithms of digital regulation loop and the coherent sampling of the reference signal are described in details. The carried-out experiments are presented as well as the results of the tests. The strong and the weak points of the selected solution in the relation to the traditional analogue techniques are pointed out. The conclusions concerning the practical usefulness of the developed calibrator are drawn.

Pasquale Arpaia, Fabrizio Clemente, Carmine Romanucci, Antonio Zanesco
EXPERIMENTAL CHARACTERIZATION OF AN EIS-BASED METHOD FOR LOWINVASIVE DIAGNOSIS OF PROSTHESIS OSSEOINTEGRATION

A digital measurement method for lowinvasive clinical diagnosis of metallic prosthesis osseointegration was proposed. Electrical impedance spectroscopy is exploited to characterize the quality of the interface bone-prosthesis tissue. In this paper, in vitro and in vivo experimental results of the application of the proposed method to the evaluation of osseointegration of metallic implants used for percutaneous fixation are shown with a specific clinical case study in audiology. In particular, a cochlear implant BAHA ® from Cochlear TM with direct bone conduction was used. In vivo measurements were performed on children with fixtures implanted respectively 7, 9, and 18 months before the test.

Romeo Ciobanu, Cristina Schreiner, Marinel Temneanu
UPON THE DIFFERENCE BETWEEN THE EVOLUTION VERSUS FREQUENCY OF PD AND BREAKDOWN PROCESSES, RELATED TO PAPER FOR DC CABLES INSULATION

Significant differences between the evolution versus frequency of the PD and breakdown processes were emphasized, suggesting that the breakdown analysis, if used as unique method in quality assessment of insulating materials, proves to have limits in accuracy and may lead to errors in results interpretation.

G.A. Kyriazis, R.T.B. Vasconcellos, J. Melcher
UNEQUALIZED CURRENTS IN TWO TERMINAL-PAIR COAXIAL CAPACITANCE BRIDGES

It is necessary to maintain conditions of zero net currents in the cables of ac coaxial bridges. Current equalizers are used for dealing with this problem. It is shown here how they were applied in the construction of a two terminal-pair capacitance bridge with an uncertainty of about one part in 108.

Patrick Boets, Leo Van Biesen
METALLIC 2-WIRE PARAMETRIC LINE MODELS - A SURVEY

A survey of frequency domain models to describe cables of the access network of operators is presented. The cable characteristics of some commercial cables are measured and the parameters of the used models identified. From this, the properties and application areas of physical models as well as rational functions are discussed. It will be demonstrated and explained why some frequently used cable models show an unrealistic impulse behavior.

Umberto Pogliano
A SYSTEM FOR CALIBRATION OF POWER QUALITY ANALYSERS

Power quality analyzers utilized in the measurements have to be calibrated and a system for both developing proper methodologies and for their calibration is now under development at I.N.RI.M. The system can supply two synchronized voltage and current signals, with the possibility of generating both calibrated periodic distorted waveforms and suitable preprogrammed aperiodic events.

Page 848 of 912 Results 8471 - 8480 of 9113