The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An effective operation of data measuring systems is not possible without the timely metrological calibration of measuring channels. Uncertainty of information imparted by uncalibrated channels leads to ineffective monitoring and wrong performance decision making. The reviews on advanced researches in the field of measuring channels calibration show negligible exploratory activity in the field and...
The growing penetration of photovoltaic (PV) systems as well as the increasing presence of time-varying loads exacerbate the variability of electrical quantities in distribution networks, thus posing new challenges for grid monitoring and management. Among the various problems that may originate from the intermittent, periodic and generally random nature of PV generation and dynamic load conditions,...
The development of a current-comparator-based high-voltage reference inductor at the National Research Council of Canada (NRC) for calibrating loss measurement systems of large high voltage shunt reactors is presented. The high voltage reference inductor features an adjustable loss angle equivalent to a power factor from zero to 0.01. It has an uncertainty of less than 10×10−6 in both magnitude and...
A bridge-based mains frequency power standard has been operated at MSL for the last 16 years. Over this time there have been some improvements to the bridge components and some refinements to the procedures used for calibrating the bridge. These changes have reduced the standard uncertainty from 19 µW/W to 11 µW/W at unity power factor.
The results of a bilateral comparison on active/reactive power meter calibrations between the National Institute of Standards and Technology (NIST) and the National Research Council (NRC) will be presented. The comparison was implemented using a transfer standard consisting of a highly stable commercial sampling-type power/energy meter. The measurements were made at 120 V, 5A, 50 Hz and 60 Hz, at...
An improved power standard derived from a current comparator power bridge for calibrating active/reactive power and energy meters under sinusoidal conditions is described. Measurements can be made at any power factor from zero lag through unity to zero lead, positive or negative power, at 120 V, 5 A, and 50 or 60 Hz. The improved power standard has an estimated basic uncertainty of 2.5 µW/VA at k...
This paper describes the results of a bilateral three-phase power comparison between SP, Sweden and MIKES, Finland. A three-phase precision electricity meter was used a transfer reference. Both active and reactive three-phase power measurements were compared.
Measurement of electrical power or energy in the area of electroenergetic, power systems and electric drivers is closely linked with use of instrument current or voltage transformers (ICT, IVT). Accuracy of these appliances substantially affects the resulting accuracy of the measurement. An important parameter which affects ICT or IVT accuracy is their burden. Therefore the calibration of instrument...
The development of a computer-controlled current-comparator-based test system for calibrating high-voltage revenue metering equipment under actual operating conditions of high voltage/high current with sinusoidal or nonsinusoidal voltage and current waveforms is described. Measurements can be made at any power factor from zero lead or lag through unity, at line-to-ground voltages up to 100 kV and...
The problem of how to choose the best estimation method for a measurand value when repeated measurements of the input quantities to a nonlinear model are performed is not clearly addressed in the guide to the expression of uncertainty in measurement. In this paper, this issue is tackled by analyzing and comparing the effect of both definitional and acquisition uncertainty contributions on the overall...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.