Toward the standardization of limits to offset and noise in electronic instrument transformers

open3noThis research has been partially funded by the European project EURAMET “Future Grid II: Metrology for the next-generation digital substation instrumentation”, co-funded by the European Union's H2020The scenario of instrument transformers has radically changed from the introduction of the Low-Power version, both passive and active. The latter type, typically referred to as Electronic Instrument Transformers (EITs), has no dedicated standard within the IEC 61869 series yet. To this purpose, in the authors’ opinion, it is worth understanding how the limits of typical disturbances affecting EITs should be standardized. In particular, after a brief review of the standards, the work presented a mathematical approach to determine the sources of signal disturbances influence, which affect the rms value, on the ratio error. From the results, we discussed that the emergence of disturbances generated within the EIT is a critical aspect to be studied with data of typical off-the-shelf devices. Therefore, to guarantee a correct operation of the devices, a proper standardization of the sources of disturbance should be provided.openMingotti A.; Peretto L.; Tinarelli R.Mingotti A.; Peretto L.; Tinarelli R