Working group report
WG A3.31

Accuracy and Calibration of Instrument Transformers with Digital Output

Issues related to the accuracy and calibration of instrument transformers with digital output are presented, addressing both laboratory and field calibration. Both IEC and IEEE accuracy definitions are considered, and appropriate circuits for high-accuracy calibration are reviewed. An update on EURAMET EMPIR Futuregrid II project is provided, showing the latest efforts in enabling deployment of digital voltage and current sensors in the evolving grid. Finally, examples of the use of digital low power instrument transformers for practical field calibration of other instrument transformers are presented.

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Transmission and distribution equipment

The scope of the SC A3 covers theory, principles and concepts, functionality, technological development, design, performance and application of materials, efficiency and operation for all devices for switching, interrupting and limiting currents, load switches, re-closers, ring-main units disconnecting switches, earthing switches surges arresters, capacitors, busbars, equipment insulators and instrument transformers and all other equipment within the substation not specifically covered under another equipment Study
Committee’s scopes.

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