Examination of the Instrument for Power Quality Estimation - Case Study

Romuald Masnicki, Janusz Mindykowski

Abstract

Evaluation of measurement properties of digital instrument can be performed in several ways. The calibration procedures relay mainly on the use of one of two standard methods: using the pattern input data set or applying the pattern reference instrument. In paper, the case of measurement experiment with use of ten instruments for electrical power quality assessment is cited. All instruments met the terms of respective standards, and measured this same network voltage. But their indications differed significantly. The question is: what are the reasons of these differences in indications? Case study - based considerations concerning calibration procedures are presented, taking into account the configuration of the measurement channel as well as the way of the measurement information handling in separate parts of measuring channel. The performed methods of the channel calibration or its characteristics verification were presented, along with obtained exemplary results. The conclusions related to the reasons of instruments indications dispersion are formulated. Another approach to measurement characteristics verification, especially performed in software part of instrument, is proposed.

Keywords

measurement channel examination, calibration procedures, measurement algorithms, electrical power quality estimation

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IMEKO-TC4-2016-46.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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