A VIRTUAL ENERGY ANALYSER FOR HARMONIC MEASUREMENTS ON DISCHARGE LAMPS

Charis N. Orfanos, Frangiskos V. Topalis

Abstract

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, the system performs energy analysis. So the total active and reactive energy is recorded, as well as the similar energies of each harmonic component. The energy is recorded in time bands that are independent each other so can be overlapped. Also there is no limit of the number of bands that can be used. A time band can last from less than a second to years. The recording can be chosen to take place in every iteration of the programme, several seconds or hours. Within the bands all the power related parameters are recorded. The maximum and minimum values of them are also taken.

Keywords

virtual instrument, power measurement, energy measurement, power quality, energy analyzer

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IMEKO-TC4-2004-136.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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