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Project MON4-GRID 2017

Management, monitoring and control of the transmission grid

Power System Research


Giovanni Pirovano

The document presents a summary of the results achieved in the researches whose objective was the study and evaluation of the operating status of the components of the transmission and distribution networks through the use of monitoring, diagnostics and communication systems, with the aim of improving the reliability and availability of the network.

This document provides a summary of the main results of the activities in the Annual Realization Period 2017 of the project "Management, monitoring and control of the transmission grid".

The document is divided into an introductory chapter which illustrates the main national and international research programs, and the main objectives of the three-year project, which is followed by the description of the project activities. The report shows the main results, the objectives and reasons for the research and development phases thereof, and a brief summary of the activities carried out in the previous Annual Realization Period. Then follows a brief description of the activities in the work of research groups and standardization at national and international level.

The action of results dissemination has been practiced continuously through the publication of articles and conference presentations, for details, see the concluding chapter.

The overall objective of the project is the study, the development and use of innovative management techniques, monitoring and diagnosis of transmission networks, in order to assess the operating performance, including also the relation to environmental conditions and to the decisive influence these have on the network.

In particular the main activities are relevant to:

Monitoring on the territory

LANPRIS experimentation and aging station for insulators: the monitoring of the behavior of polymer isolators or in the presence of different types of coatings was carried out; the experimentation was carried out on 4 types of insulators with three different creepage lengths, reduced compared to normal sizing, to accelerate aging phenomena. 

Dispositivo AMICO DC: the level of pollution and the remote adjustment of the system were monitored. A comparison was also made with AC measurements coming from the AMICO II system and with data from insulators installed in the LANPRIS station. The realization and experimentation in the laboratory of the prototype of the new McMel compact conductance meter (low voltage) was also carried out to monitor the level of contamination of insulators. 

• Mapping of the level of contamination of air insulation on the national territory: the measurement of the ESDD and NSDD contaminants on the samples taken from over 200 sites in the Italian territory continued. First analyses were made of the data obtained from the measurement campaigns and the first set-up of the modeling systems used for the realization of the first mapping. A first consolidation of the contamination levels forecasting system was performed for the assessment of the deposit of soluble and insoluble atmospheric pollutants on insulators. 

• Monitoring and laboratory tests of the contamination level and degradation of line and station insulators: the analysis of data from monitoring systems (ILCMS) of surface currents installed in high-voltage stations and overhead lines continued, in parallel with the analysis of composite isolators taken from the service. The activities are aimed at comparing the deterioration over time, due to the aggressiveness of the environment and the action of solar radiation, of the mitigation solutions adopted.

Diagnostic of grid components

Pre-engineered optical system for electric field measurement on live components (with a Lithium Niobate sensor): the characterization of the optical system for measuring electric fields in DC has been carried out. 

Accelerated aging tests on samples reproducing the paper-oil insulating system of a transformer: the validation of non-traditional and off-line diagnostic methodologies for the control of accelerated aging parameters of transformers was carried out through a constant comparison with the results of oil analysis performed by TERNA. 
• Development of optical sensors for monitoring of network components: the validation of innovative optical methodologies developed for the detection of furans and corrosive sulphur has been carried out by comparison with traditional and consolidated techniques. 

• Development of the corona simulation code: validation of the code in AC cases and development of chemical databases stable from a thermal point of view (the temperature remains bounded, as it happens in the case of un-stable databases). 

Development of the simulation code of partial discharges: the simulation algorithm of the movement of surface charges has been improved (in order to allow the treatment of cases characterized by very high surface conductivity). 

Design and implementation of the electro-optical field sensor: validation tests and complete characterization of the system were carried out 

Development of transparent and conductive visor masks for live protection devices: a research activity was carried out aimed at increasing the electrical conductivity of the visors and at their characterization in the laboratory. 

Chemical modeling of polyethylene aging: a kinetic modeling of low-energy aging and quantum-mechanical characterization of the crystalline structure was carried out to estimate the energy of electronic extraction, supported by laboratory tests.

Asset and components management 

Eye safe system for measuring the distance from the ground of overhead conductors: field installation of the device for the measurement of the sag was carried out in conditions associated with the formation of ice sleeves. 

System prototype for the continuous monitoring of the overhead line clearance: the tests of the main components of a demonstrative with a modular structure prototype were carried out. Hardware and software for system management, image acquisition and analysis was also developed. 

Guidelines for the LCA analysis of electrical network components in the Italian context: the application of the guidelines to a case study was carried out: LCI of the innovative conductor (HTLS) and of future Italian electrical mixes; LCA of electricity transmission by means of an AT line with innovative conductors. 

Modeling and metrological characterization of inductive voltage transformers in comparison to harmonics: the identification and validation of inductive measurement transformer models has been carried out.

Methodologies and instruments for calibration verification or field calibration and high voltage measurement of energy measurement chains: medium-term stability test of the LiOnHV equipment for the verification of the accuracy of instrument transformers for energy measurements. 

Stand-Alone Merging Unit (SAMU) prototype: the realization of a first laboratory prototype of SAMU with advanced functionalities (Smart - SAMU) and its metrological characterization in collaboration with the National Institute of Metrological Research (I.N.Ri.M.) was carried out.