Niclas Björsell, Peter Händel
One method to characterize ADCs is to use a histogram, where Gaussian noise may be used as stimulus signal. However, a Gaussian noise signal that excites all transition levels also generates input values outside working range of the ADC. Modern signal generators can generate arbitrary signals. Hence, excluding undesired values outside the ADC full scale can minimize test sequences. Truncating the signal to the working range gives further advantages, which are explored in this paper. The statistical properties is theoretically evaluated and compared. It is shown that accuracy increases for a...
Charis N. Orfanos, Frangiskos V. Topalis
This paper presents an energy analyser with the required specifications for the investigation of the electrical performance of non-linear loads and especially of discharge lamps. The instrument is a virtual digital oscilloscope and a spectrum and energy analyser but the emphasis is given to record the energy. It has been developed using a graphical programming language. All the necessary measurements are taken in real time, on line. A DAQ board through two analogue input channels samples the voltage and current waveforms. Their frequency spectra are determined using FFT and DFT. Moreover,...
TC4 Symposium 2004
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· 2004
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Daniele Gallo, Carmine Landi, Nicola Pasquino, Nello Polese
Continuous monitoring of power grid aimed at assuring compliance of power quality indexes to standard requirements, calls for a wide range of instruments, each devoted to a different measurement. Metrological confirmation of the whole set of devices and instruments turns out to be a complex task – because of the variety of characteristics to be tested – that requires time to be com-pleted which eventually determines high costs, not to mention that during confirmation activities in-struments cannot be used. The purpose of the laboratory presented is to provide a complete set of con-firmation...
TC4 Symposium 2004
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· 2004
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A. Bernieri, L. Ferrigno, M. Laracca, P. Verde
The paper proposes a distributed sensor network based on a wireless BlueTooth communication system or Power Quality (PQ) assessment in power systems. The architecture of the sensor node is described and characterized, together with the analysis of the measurement and communication procedure able to perform the PQ indices evaluation according the IEC 61000-4-30 norm.
TC4 Symposium 2004
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· 2004
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G. Andria, L. Filotico, A.M.L. Lanzolla, F. Piccininni, T. Scialpi
This work proposes the development and characterization of innovative domestic heating system driven by solar assisted heat pump in order to increase the system efficiency. A suitable on-line measurement system of overall observable quantities has been integrated in the plant, to give accurate and updated measurements of all the variables interesting the whole system. A more detailed analysis of quantities that main influence the system performances has been carried out, developing a suitable mathematic model able to describe and control the behaviour of interested phenomena. Finally some...
TC4 Symposium 2004
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S. Taranov, Y.Tesik, A. Olencki
It is necessary to carry out two selective operations for high accuracy measurement some of Electric Power Quality Indexes (EPQI): first of all it is necessary to pick up fundamental harmonic voltages from a spectrum of three phase voltage system, then, a positive, negative and zero symmetrical components. A selective devise must provide minimal amplitude and phase error in the real conditions – variation of an angular frequency of voltages. It is proposed an adaptive amplifier with spectrum conversion. The adaptive amplifier is described by non-linear differential equations with variable...
TC4 Symposium 2004
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· 2004
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Stanislaw Galla, Beata Palczynska, Ludwik Spiralski
The paper analyses the random components influence on the values characterising periodic disturbances in the supply line voltage on the example of the total harmonic distortion coefficient (THD). It presents the method to determine the uncertainty in the THD coefficient measurement, which takes into account the correlations appearing between the fundamental component and the successive harmonics of the supplying voltage, and also between particular harmonics. The analysis of the results from the total harmonic distortion coefficient measurements in the supplying voltage of a motor drive...
TC4 Symposium 2004
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C. Donciu, M. Cretu, S. Hanganu, E. Lunca
In the present paper is presented a method for on-line narrow spike detention from distorted signals. The method consists of successive derivations of the distorted signal till the only event remains significant in the sequence. A study for narrow spike form influence in detection will be performs.
TC4 Symposium 2004
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Claudio De Capua, Annalisa Liccardo, Emilia Romeo
In recent years, particular attention has been focused about problems regarding Power Quality. In 1995, IEEE technical committee defines some fundamental indexes capable of quantifying the quality of the power generation and transmission. In authors’ opinion, the list of the proposed indexes seems to be inadequate to exhaustively detect voltage or current disturbances at all. In this paper, the authors propose for new indexes and a respective original procedure for measuring and evaluating voltage sags, according to the standards definitions.
TC4 Symposium 2004
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· 2004
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Daniele Gallo, Carmine Landi, Nicola Pasquino
A new instrument for the evaluation of disturbances caused by variations in lamp voltage (light flicker) is proposed, based on light intensity measurements. Unlike current standard (IEC EN 61000-4-15), which determines flicker severity by filtering powering voltage measurements with a standard lamp model (230V/60W), the presented methodology includes the lamp itself in the measurement process, thus realizing an objective measurement of flicker. A testing station for the metrological characterization of the device has been implemented and measurements have been compared to a standard IEC...
TC4 Symposium 2004
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· 2004
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