FutureGrid II

FutureGrid II – Democratizing energy markets through the introduction of innovative flexibility-based demand response tools and novel business and market models for energy  cooperatives
  • Dates: June 2017 – May 2020
  • Project web:
  • Leader: PTB
  • Grant agreement number: 727961
  • Financed by



The first generation of analogue measurement and control systems in power grid substations are approaching the end of their useful lifespan. Increasingly more often their replacement is based on digital substation automation solutions according to IEC 61850. To support the European electrical power industry, this project will provide yet missing solutions for the calibration and timing of the new type of substation instrumentation. The project will also support standardisation organisations in their work on revision of the related standards, with the specific aim on proposing solutions, which would enable more precise measurements in the future.

The decarbonisation of energy systems is causing significant and unprecedented changes in electrical power grids, due to the wide-scale introduction of decentralised renewable energy resources. Consequently, future electrical power grids will require real-time capable control and monitoring systems to ensure stability under increasingly complex and challenging conditions. The associated digital high voltage sensors and digital metering systems must be managed through accurate and reliable time synchronisation in a wide area. This is reflected in the objective 4.

New standards in the IEC 61869 have recently been published for low power instrument transformers (LPIT), or are expected to be released for the electronic current and voltage transformers in the future, as well as the for stand-alone merging units (SAMU) in 2018. Due to introduction of these new standards, the movement from traditional analogue instrument transformer (IT) technology towards the new digital instrumentation technology is expected to gain speed, both on transmission (>100 kV) and on distribution (<100 kV) level. To support this change, new metrological tools and methodologies are needed. The need to provide test systems for new LPIT and SAMU technology is addressed in objectives 1 and 2. Also, test systems are needed to prove performance of intelligent electronic devices, like digital energy meters or real-time critical all-digital PMU’s. This is addressed in objective 3. Lastly, in order to enable industrial uptake and uniformity, active support of standardisation organisations is required, which is addressed in objective 5.


  1. To establish calibration methods to support dynamic testing of digital instrument transformers (IT) for rated voltages up to 400/√3 kV and at least 2 kA.
  2. To develop reference standards for the calibration of instruments with digital input or output, in order to support the transition to digital substations.
  3. To develop metrological tools for the characterisation of devices that exploit sampled values in digital substations, such as all-digital power and power quality meters and phasor measurement units (PMUs).
  4. To develop traceable reference standards for the verification of time and synchronisation methods.
  5. To facilitate the take up of the technology and measurement infrastructure developed in the project.


  • CIRCE will review the in-force IEC/IEEE standards and technical reports and will investigate most recent literature data and waveform database on PQ/PMU testing and propagation phenomena.
  • CIRCE, with support of UNIBO, will update its PQ algorithms (based on the Spanish PQ measurement standard owned by CEM and developed by CIRCE) to include the latest standards (e.g. IEC 61000-4-30 Ed3) applicable to PQ calibrations. Besides, CIRCE will adapt the PQ reference system to receive digital input information coming from the EUT (Equipment under test) (A1.1.1) via digital communication networks (IEC 61869-9:2016) and include advanced timing synchronisation features like the one specified in IEC 61588 Ed2 (PTP, also known as IEEE 1588v2).
  • Moreover, CIRCE will upgrade and extend its PQ calibration platform to take advantage of the digital approach and the advanced interfaces of SV values extraction, guaranteeing the compatibility of the SV interface with these features


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