Riccardo Tommasini

Increasing of the electric safety in HV systems by means of the ground resistance of the body

Riccardo Tommasini, R. Pertusio

The dangers of personnel in high voltage stations can be very elevated, so the sharp evaluation of the resistance to ground of human body ( Reb ) is very useful to establish and improve the safety levels and the plan interventions. The …

Progress on fusion target gain using 2.2MJ of laser energy at the National Ignition Facility

A. L. Kritcher, Dave Schlossberg, Chris Young, Riccardo Tommasini et autres

Inertial confinement fusion (ICF) with lasers is a leading approach for generating and confining nuclear fusion, and it is the only method to date that has attained target gain and ignition, as defined by the Lawson criterion, in a controlled laboratory setting. …

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Validation and Testing of an Analytical Formulation to Compute the Reduction Factor in MV Grids

Pietro Colella, Enrico Pons, Cristian Piran, Riccardo Tommasini

Global Earthing Systems (GESs) are defined by International Standards IEC 61936-1 and EN 50522 as an equivalent Earthing System (ES) created by the interconnection of local ESs. Thanks to this interconnection, just a percentage of the total fault current is injected to …

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Optimization of Digital Overcurrent Protection Settings in DC Urban Light Railway Systems

Enrico Pons, Pietro Colella, Roberto Rizzoli, Riccardo Tommasini

DC urban light railway systems are used for public transportation in many towns worldwide. In these systems, short-circuit currents are often similar, both in steady-state magnitude and in rate-of-rise, to normal operation currents. In order to properly set the protection relays, to …

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Fall of Potential Measurement of the Earth Resistance in Urban Environments: Accuracy Evaluation

Pietro Colella, Enrico Pons, Riccardo Tommasini, Maria Luisa Di Silvestre et autres

Both Standards EN 50522 and IEEE 81 propose the fall of potential method (FPM) to carry out the measurement of the resistance to earth (RES) of an earthing system (ES). However, in urban areas, the recommended distances between the ES and auxiliary …

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Electrical Safety of Plug-In Electric Vehicles: Shielding the Public from Shock

Fabio Freschi, Massimo Mitolo, Riccardo Tommasini

This article discusses fundamental electrical safety issues, especially protection against electric shock, for those interacting with electric vehicles (EVs). The safety of users may be challenged by the vehicle's increased operating voltages, at different frequencies, possibly making the protection against direct and …

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Ground Resistance of Buried Metallic Parts in Urban Areas: An Extensive Measurement Campaign

Giuseppe Cafaro, Pietro Colella, Pasquale Montegiglio, Enrico Pons et autres

In urban and industrial areas, a relevant presence of buried metallic objects (e.g., gas and water pipes, etc.) can be detected. Usually, these elements are imagined as widespread meshed metallic grids in a good contact with the soil. In the last years, …

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Analysis of Causation of a Flour Dust Explosion in an Industrial Plant

Fabio Freschi, Massimo Mitolo, Riccardo Tommasini

Common solids (e.g., flour, sugar, etc.,) can be suspended and transported in air via pneumatic conveying systems. Finely divided solid substances dispersed into a dust cloud (e.g., into a silo) can form a potential explosive atmosphere, if in the right concentration with …

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Distinguishing short circuit and normal operation currents in DC urban light railway systems

Enrico Pons, Pietro Colella, Roberto Rizzoli, Riccardo Tommasini

DC urban light railway systems are used as public transportation systems in many towns worldwide. In these systems, short circuit currents are often similar, both in steady state magnitude and in rate-of-rise, to normal operation currents. In order to properly set the …

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Earth resistance measurements in urban contexts: Problems and possible solutions

Pietro Colella, Enrico Pons, Riccardo Tommasini, Eleonora Riva Sanseverino et autres

Both EN 50522 and IEEE Std. 81 propose the Fall of Potential Method (FPM) to carry out the measurement of the resistance to earth of an Earthing System (ES). However, in urban areas, the recommended distances between the ES and auxiliary electrodes …

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MV ground fault current distribution: An analytical formulation of the reduction factor

Pietro Colella, Enrico Pons, Riccardo Tommasini

Global Earthing Systems (GESs) are defined by international standards IEC 61936-1 and EN 50522 as an equivalent Earthing System (ES) created by the interconnection of local ESs. Thanks to this interconnection, just a percentage of the total fault current is injected to …

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Ground currents in a photovoltaic power plant: Theoretical approach and experimental tests

Alessandro Ciocia, Valeria Cocina, Pietro Colella, Paolo Di Leo et autres

Arrays of photovoltaic (PV) modules, mounted on metallic structures, always create stray capacitances between active conductors and ground. Thus, leakage currents flowing in these ground capacitances are formed. If the number of PV modules array is high, these currents can reach some …

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