Ocena wybranych właściwości metrologicznych liczników energii elektrycznej prądu stałego

W artykule przedstawiono stanowisko pomiarowe, przeznaczone do oceny właściwości metrologicznych nowoczesnych liczników energii elektrycznej prądu stałego. Stanowisko to składa się z dwóch wielofunkcyjnych kalibratorów, oraz skonstruowanej na potrzeby tego stanowiska specjalizowanej przystawki wysokonapięciowej umożliwiającej generację napięć stałych do 4 kV o odpowiednio wysokiej dokładności. Opisano szczegółowo poszczególne elementy tego stanowiska wraz z wynikami wzorcowania.

The paper presents a method for evaluating the accuracy of indications of the direct current Watt-hour meters in a designed and constructed measuring system. Such system is composed of two multi-function calibrators, and a specialized high-voltage attachment, designed for the needs of this system, which makes it possible to generate direct voltages in a required range up to 4 kV with suitable high precision. The values of voltages supplying the of the Watt-meter – extorted a suitable configuration of the equipment on the constructed measuring system, which guarantees proper galvanic separation of particular components of the measuring system as well as its safe operation. Both calibrators with specialised high-voltage attachment, dedicated for the measuring system, were calibrated in order to evaluate the accuracy of the whole system. The calibration results, together with the determined value of expanded uncertainty, were included in the calibration certificate. The authors described in detail particular elements of the measuring system together with the results of its calibration. The function of direct current Watt-hour meters is the measurement of power and electrical energy in circuits of direct current supply in a railway traction network 3.3 kV. The measurement results were completed with a presentation of uncertainty budgets.