6533b823fe1ef96bd127f53e

RESEARCH PRODUCT

On the distribution of lightning current among interconnected grounding systems in medium voltage grids

Guido AlaGaetano ZizzoSalvatore FavuzzaG. GigliaElisa Francomano

subject

lightning currentlightning strokeControl and Optimization020209 energyEnergy Engineering and Power TechnologyShields02 engineering and technologyFault (power engineering)lcsh:TechnologyBare buried rope; Full-wave; Grounding; Lightning current; Lightning Protection System (LPS); Lightning stroke; Metal shields; Computer Science (all); Renewable Energy Sustainability and the Environment; Energy Engineering and Power Technology; Energy (miscellaneous)Metal shield0202 electrical engineering electronic engineering information engineeringmetal shieldsElectrical and Electronic EngineeringEngineering (miscellaneous)Electrical conductorlcsh:TRenewable Energy Sustainability and the Environmentbusiness.industryGroundComputer Science (all)Electrical engineeringgroundinglightning current; lightning stroke; grounding; full-wave; Lightning Protection System (LPS); metal shields; bare buried ropeLightningConductorSettore ING-IND/33 - Sistemi Elettrici Per L'Energiafull-waveSettore ING-IND/31 - ElettrotecnicaLightning Protection System (LPS)Distribution of lightningbare buried ropebusinessGeologyEnergy (miscellaneous)Voltage

description

This paper presents the results of a first investigation on the effects of lightning stroke on medium voltage installations' grounding systems, interconnected with the metal shields of the Medium Voltage (MV) distribution grid cables or with bare buried copper ropes. The study enables us to evaluate the distribution of the lightning current among interconnected ground electrodes in order to estimate if the interconnection, usually created to reduce ground potential rise during a single-line-to-ground fault, can give place to dangerous situations far from the installation hit by the lightning stroke. Four different case studies of direct lightning stroke are presented and discussed: (1) two secondary substations interconnected by the cables' shields; (2) two secondary substations interconnected by a bare buried conductor; (3) a high voltage/medium voltage station connected with a secondary substation by the medium voltage cables' shields; (4) a high voltage/medium voltage station connected with a secondary substation by a bare buried conductor. The results of the simulations show that a higher peak-lowering action on the lighting-stroke current occurs due to the use of bare conductors as interconnection elements in comparison to the cables' shields.

yearjournalcountryeditionlanguage
2018-03-28
10.3390/en11040771http://www.mdpi.com/journal/energies/