Need for the Project

This JRP focuses on the possibilities of novel non-conventional sensors for current or voltage measurement. Many of these technologies are already applied and promise wider bandwidth, and lighter weight, but they are not yet of the required metrological accuracy. The first generation of measurement systems installed in the European power network is getting old, and the systems are being replaced. Therefore there is a need to ensure that appropriate technology is available that enables reliable and robust control and billing in future power networks.

The European standardisation bodies CEN and CENELEC were invited by EURAMET to put forward their testing and measurement needs relating to the EMRP Call 2013 Energy and Environment. This JRP responds to the needs identified by CENELEC technical committees TC13 and TC38.

From a metrological point of view there is a need to find complementary solutions for the calibration of new non-conventional technologies. The traditional voltage and current transformers work well on power frequency; but new solutions are needed for NMIs to be able to provide accurate calibration of the sensors required for power quality measurements on medium and high voltage networks.

The connection of distributed renewable energy sources to the electrical transmission grid such as wind farms will lead to a higher presence of harmonics in the transmitted waveform. The need to determine these harmonic voltages and currents poses new requirements for the measurement infrastructure associated with the generation, delivery, and protection of the electrical network. In addition, both the bandwidth of these traditional instrument transformers and the capabilities of the current measurement and communication network do not match that of modern low voltage instrumentation.

Due to many factors such as the design, manufacturing tolerances, burden or temperature, the frequency response varies significantly between different makes of traditional voltage transformers. Moreover, the weight of these devices makes their transport for calibration impractical. Solutions based on alternative technologies are not yet mature enough for wider application for on-site calibration or power quality measurements on high voltage grid and thus require further research.