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.
XVIII IMEKO World Congress · TC4 · 2006 · Download
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.
XVIII IMEKO World Congress · TC4 · 2006 · Download
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.
XVIII IMEKO World Congress · TC4 · 2006 · Download
Wieslaw Barwicz, Andrzej Podgórski, Serghei Duminov, Roman Z. Morawski
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...
XVIII IMEKO World Congress · TC4 · 2006 · Download
Pasquale Arpaia, Fabrizio Clemente, Carmine Romanucci, Antonio Zanesco
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...
XVIII IMEKO World Congress · TC4 · 2006 · Download
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.
XVIII IMEKO World Congress · TC4 · 2006 · Download
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 10 8 .
XVIII IMEKO World Congress · TC4 · 2006 · Download
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.
XVIII IMEKO World Congress · TC4 · 2006 · Download
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.
XVIII IMEKO World Congress · TC4 · 2006 · Download
This paper concerns the problem of proper evaluation of power quality in naval networks. Two aspects of the problem have been addressed. Firstly, the appropriate choice of power quality parameters for the aim has been discussed. Secondly, the methods of their estimation especially concerning aggregating of measurement intervals have been discussed. These considerations will be based on the basis of the original authors’ research carried out in ship electrical power systems and relevant examples from this work will be given. Presented paper is a continuation and complementary part of the...
XVIII IMEKO World Congress · TC4 · 2006 · Download