On Testing the Electronic Revenue Energy Meters

Ferrero, Alessandro; Faifer, Marco; Salicone, Simona

doi:10.1109/tim.2009.2016821

Cited by 39 publications

(29 citation statements)

References 9 publications

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“…These studies lead us to the conclusion that testing energy meters supplying their voltage and current input channels with formerly unknown signals (RH tests), characterized by a number of randomly generated spectral components is not effective, which is in contrast to conclusions drawn by the authors in 13 . Consequently, the authors of this paper suggest performing a test containing 24 points.…”

Section: Suggestionsmentioning

confidence: 92%

“…Adaptation of this condition (3) allows one to obtain standard uncertainty of type A -uA<0.02%. Many authors 13 do not apply standard uncertainty of type A at uncertainty evaluation of energy meters test results -this leads to unreasonable measurement time increase or to test results not meeting the required quality. …”

Section: Experimental Performance Evaluationmentioning

confidence: 99%

“…Next article [13] proposes application of randomly distorted waveforms for voltage and current signals with total harmonic distortion (THD) factor equal to 10% for voltage and 40% for current. These values are equal to the ones applied in the 5 th harmonic presence test according to the EN 50470.…”

Section: Introductionmentioning

confidence: 99%

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Testing Of Energy Meters Under Three-Phase Determined And Random Nonsinusoidal Conditions

Olencki¹,

Mróz²

2014

Metrology and Measurement Systems

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Electric energy meters are designed to account energy under sinusoidal and nonsinusoidal conditions, because both, old and new standards for energy meters require testing their accuracy under different conditions. The latest EN 50470 standard increases the range of meter testing under nonsinusoidal conditions, introducing new shapes of test signals such as the phase fired waveform or the burst fired waveform. This paper discusses calibration problems of electronic revenue energy meters for direct connection and for connection through current transformers, and it proposes a new calibration procedure which reproduces normal operating conditions better: three-phase configurations of measurement systems, load range during meter testing or shapes of test signals. Recently, modern Electrical Power Standards, also known as Power Calibrators, enable automatic testing of various types of electrical devices, including electricity meters in their normal operating conditions. This article presents examples of single and multi position fully automatic test systems, which employ Power/Energy Calibrator from Poland as the precision source with programmed waveforms of three phase voltages up to 560 V and currents up to 120 A conforming to EN 50470, or with random waveforms generated by PC software random wave generator. Measurement uncertainty of the energy meters under different nonsinusoidal conditions using a test system with reference to accuracy of the power calibrator or to the reference meter, are discussed.Comparative analysis of test results for different shapes of voltage and current signals is presented in the conclusions of this paper.

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Section: Suggestionsmentioning

confidence: 92%

Section: Experimental Performance Evaluationmentioning

confidence: 99%

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Testing Of Energy Meters Under Three-Phase Determined And Random Nonsinusoidal Conditions

Olencki¹,

Mróz²

2014

Metrology and Measurement Systems

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“…Accuracy-related issues, when Static meters are exposed to distorted waveform conditions have been reported in literature during the last years [1], [8], [9]. The results of distorted load sets tests in [1] shows that static meters could have accuracy errors from -6.6% to 6.5%, compared with the measures of a calibrated energy system analyser.…”

Section: B Static Electricity Metermentioning

confidence: 97%

“…In [6] and [7], analogue meters under non-sinusoidal condition tend to register less energy consumption (negative error), but such error seems to be negligible and favourable to the consumer [9].…”

Section: A Electromechanical Electricity Metermentioning

confidence: 99%

A review of electrical metering accuracy standards in the context of dynamic power quality conditions of the grid

Cetina

Roscoe

Wright

2017

2017 52nd International Universities Power Engineering Conference (UPEC)

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Numerous changes in electrical grid schemes, like the inclusion of renewable energy, the rise of non-linear loads and the emergence of electric vehicle charging, increases variable power quality conditions of the grid. In this dynamic scenario where energy could flow in both directions and the waveforms could be highly distorted, accuracy becomes a crucial factor for the correct measurement of electrical energy and power values. Errors in the assessment of these values have significant ramifications for revenue, billing and/or control. This non-ideal power quality scenario produces an error in electricity meters, that is not yet well known since there is no standardised procedure to calibrate meters under typical or emerging distorted waveform conditions. Current standards relevant for revenue energy meters like EN 50470-3:2006 allows measurements error up to ±2.5% while local regulations could be even more permissive. In order to establish an electricity fair trade market and meet expectations from consumers and utilities, electricity meters should arguably comply with higher accuracy standards. In this paper, the pertinence and possible impact of including tests under distorted waveform conditions, as well as new accuracy requirements on standards applicable to electricity meters for billing purposes will be discussed.

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