NDLI: A numerical approach to the evaluation of uncertainty in nonconventional measurements on power systems

Content Provider	IEEE Xplore Digital Library
Author	Locci, N. Muscas, C. Peretto, L. Sasdelli, R.
Copyright Year	2001
Description	Author affiliation: Dipartimento di Ingegneria Elettrica ed Elettronica, Cagliari Univ., Italy (Locci, N.)
Abstract	The use of digital signal processing techniques allows measuring any quantity mathematically defined. However, the application of the rules endorsed by the ISO "Guide to the expression of uncertainty in measurement" to evaluate the measurement uncertainty can turn into a difficult task, for instance, when quantities different from those usually measured to characterize the operation of power systems must be determined. In this paper, a numerical approach is proposed to easily tackle this task. Contrary to the closed-form approach, which allows to evaluate the output uncertainty by analytically solving the uncertainty propagation law, as prescribed by the ISO Guide, the method proposed numerically finds the uncertainty by applying a recursive algorithm. First, first the validity of the numerical approach is proved in the case of the spectral analysis of a periodic signal, which is the first step for nonconventional measurement. Then, the approach is used to evaluate the uncertainty in the measurement of the harmonic losses of a power transformer supplying nonsinusoidal load currents. The results confirm that these losses can be accurately determined from the difference between two powers measured as correlated quantities at the transformer output terminals.
Sponsorship	IEEE Instrum. & Meas. Soc.
Starting Page	698
Ending Page	703
File Size	850387
Page Count	6
File Format	PDF
ISBN	0780366468
ISSN	10915281
DOI	10.1109/IMTC.2001.928909
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-21
Publisher Place	Hungary
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power measurement Measurement uncertainty ISO Loss measurement Power transformers Digital signal processing Power system analysis computing Power system measurements Algorithm design and analysis Signal processing algorithms
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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