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Live, On-site Verification of Metering HV Instrument Transformer Accuracy: Improvements and Perspectives

pubblicazioni - Articolo

Live, On-site Verification of Metering HV Instrument Transformer Accuracy: Improvements and Perspectives

Accuracy of measuring chains used for metering is essential for the energy market correct operation.

By consequence, as happens for meters, the possibility of a check, periodical or on demand, should be granted, both for transducers in service since long time and for the new ones. At this aim, new equipment prototypes and methodologies were set up and successfully tested on site, demonstrating the feasibility of a live, on site, HV instrument transformer accuracy check, not interfering with normal service conditions. In the present paper are discussed the necessary improvements carried on in order to make on-site operation cost effective, both from equipment and methodology point of view; at present, accuracy check cannot substitute laboratory calibration at present based on laboratory tests performed at stated current and voltage rms values, since is performed at voltage and current values given by system operation; nevertheless, high accuracy standard equipment availability and cost effective, non intrusive, installing methods could lead, in the future, to a new conception of on site instrument transformer true calibration.

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