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On site live verification of the accuracy of instrument trasformers for metering purposes

pubblicazioni - Articolo

On site live verification of the accuracy of instrument trasformers for metering purposes

The importance of the measurements performed by voltage and current transformers installed in transmission and distribution networks, has been increasing with the energy market liberalization: even tiny measuring errors, integrated over a long period, may result in significant financial unbalance in trading energy.

Unfortunately at the moment, despite to their importance, voltage and current transformers, due to economical and technical reasons, are not subjected to periodical controls to check the stability of their metrological characteristics. In the paper a possible methodology to verify the accuracy of installed Instrument Transformers is considered and the experience of CESI RICERCA on the subject is described.

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