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Report RSE 17000454

Voltage, Current and Energy Measuring Systems for Medium and High Voltage Network

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The research activity presented in this report aims at the improvement of voltage, current and energy measurements in electricity Transmission and Distribution grid, both locally, focusing on each measuring chain, and globally, at system level.

This goal can be achieved by relying on the availability of Reference Measuring Systems, which can be provisionally installed within the live network using noninvasive methods and without impact on normal system conditions; the results obtained, even if self-standing, shall be considered and evaluated in the framework of a wider and multiannual research path.

The activity performed focused on the project of the qualifying components, with particular reference to the Data Acquisition stage, of a prototype of a Stand-Alone Merging Unit (SAMU) with advanced features, aiming at the improvement of the accuracy of data measured by inductive voltage and current transformers, a power frequency and in presence of harmonics and other power quality events. This goal is based on the development of mathematical models taking into account both the hysteresis and the non-linear behaviour, in frequency and in amplitude, of inductive instrument transformers.

Laboratory test activities were performed in order to achieve further improvements in the metrological characterization of one among the very few equipment available at international level for the live, onsite verification of the accuracy of voltage, current and, by consequence, energy measurements in High Voltage Networks. The characterization activity aimed in particular at the improvement of the measurement uncertainty component tied to both short and long term stability versus temperature of the reference measuring system.

Further investigation was performed about study, modelling and test activities performed in cooperation with Milan Polytechnic University in order to evaluate the behavior of inductive instrument transformers in presence of harmonics and other power quality events.

Active contribution within the relevant pre-standardization and standardization technical committees at national and international level (CIGRE, CEI, CENELEC, IEC) finally allowed an effective dissemination of both the results obtained and of the ideas conceived, in order to foster a wide and fast diffusion not only at Academy but also Industrial level, and increasing this way their impact at global level.

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