Test for immunity to conducted disturbances in the frequency range

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Dr. Varjú György
Department of Electric Power Engineering

Electricity meters based on Ferraris principle are continously being replaced by electronic meters all over the world. This tendency is also true for Hungary. The DSOs (Distribution System Operator) install only electronic meters to the costumers from the february of 2011. Among electronic meters smart meters can play a key role. These devices can supply the customers and the DSOs with such informations, which can realize a more accurate and more energy efficient measurement method. Smart meters will be one of the most important part of the future’s grid, also known as smart grid. Concerning that these meters form the bases of invoices, it is important to have adequate immunity to disturbances, which can influence the meters accuracy. To ensure immunity, meter manufacturers test their meters according to the related standards and regulations. In the past few years new electromagnetic phenomena occured in the frequency from 2-150 kHz, which may have potentional effects for the accuracy of the meters (for also smart and solid state meters too). The problem is not negligible at all, because EMC standardization is insufficient in this frequency range, and more and more electronic devices will be installed in the future using this frequency range. In my thesis I present the main sources of electromagnetic interference in the frequency range of 2-150 kHz. I show the current situation of EMC standardization and present my test results to conducted disturbances in the case of some smart and some solid state meters, got from ELMŰ-ÉMÁSZ ltd. (Hungarian Dso) department of Measurement and Meter control.


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