Measurements, Models, Systems and Design

531 s.

Methods for checking a circuit with energy meter and current transformer

W artykule opisano specyfikę sprawdzania układów półpośrednich dla potrzeb oceny dokładności systemów pomiarowych stosowanych w rozliczeniach energii elektrycznej. Opisano i porównano dwie metody: dwufunkcyjną i proponowaną jednofunkcyjną sprawdzania układów półpośrednich. Przedstawiono teoretyczne podstawy stosowania obu metod oraz schematy aplikacyjne z zastosowaniem opracowanych testerów.The paper presents methods for checking an energy measuring circuit including an energy meter and current transformer (Fig. 1). In Paragraph 2 there are described and compared two methods: a double and single function method. Circuits for measuring the errors of the energy meter with a current transformer (Fig. 2), energy meter (Fig. 3) and current transformer (Fig. 4) are presented in Paragraphs 3-5. The analysis of the discussed methods is given in Table 1. The double function method makes it possible to check the accuracy of the circuit with an energy meter and current transformer and full diagnostics of this scheme. The double function method is dedicated to multifunction (double function) testers of energy meters with additional function of an instrument current transformer tester. Double function testers Calport 100 Plus accuracy class 0,1 and 0,2 and Caltest 300 accuracy class 0,05 and 0,1 have been produced in Poland since 2009. The single function method is dedicated for single function energy meter testers - these popular testers, for example Calport 100, have been manufactured in Poland for 10 years