Search results for "Earthing system"

showing 3 items of 33 documents

Earth resistance measurements in urban contexts: Problems and possible solutions

2017

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 are not easy to respect, due to the presence of buildings and tarmac. Moreover, unknown buried metallic parts, as well as the interconnection among the ESs made by the Distributor System Operator, could modify the earth potential profile of the area, affecting the measurement results. In this paper, the issues that could affect the measurement result if FPM is used in an urban context are presented. A parametric analysis, carried out with Comsol …

earthing systemEngineering020209 energyMultiphysicsContext (language use)02 engineering and technologyEarthing; Grounding; earth resistance measurements; urban context; IEEE Std. 81; EN 50522; fall-of-potential method; earthing system; unknown buried metallic partsField (computer science)Operator (computer programming)0202 electrical engineering electronic engineering information engineeringurban contextGroundingSimulationInterconnectionbusiness.industryGroundEN 50522Potential methodEarthing systemReliability engineeringSettore ING-IND/33 - Sistemi Elettrici Per L'Energiafall-of-potential methodunknown buried metallic partsEarthingearth resistance measurementsIEEE Std. 81businessEarth resistance
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Considering safety issues in minimum losses reconfiguration for MV distribution networks

2009

This paper offers a new perspective over the traditional problem of the multiobjective optimal reconfiguration of electrical distribution systems in regular working state. The issue is indeed here formulated including also safety issues. Indeed, dimensioning the earth electrodes of their own secondary substations, distribution companies take into account the probable future configurations of the network due to transformations of overhead lines into cable lines or realization of new lines. On the contrary, they do not consider that, during normal working conditions. the structure of the network can be modified for long periods as a consequence of reconfiguration manoeuvres, with differences …

earthing systemEngineeringreconfigurationbusiness.industryEvolutionary algorithmEnergy Engineering and Power TechnologyControl reconfigurationEarthing systemFuzzy logicReliability engineeringlaw.inventionSettore ING-IND/33 - Sistemi Elettrici Per L'Energiamultiobjective optimizationelectrical safetylawElectronic engineeringElectrical and Electronic EngineeringTransformerbusinessDimensioningRemote controlVoltageEuropean Transactions on Electrical Power
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A study of the behaviour of earth electrodes connected together in resonant earthed neutral systems

2005

Inside urban areas the earth electrodes of the MV/lv substations are often electrically connected together so as to form a single extended earthing system. The advantages of the realization of an extended earthing system are the reduction of the current that each substation earth electrode injects in the soil during the fault and a better uniformity of the voltages to earth inside the urban area. In previous works, models for the study of extended earthing systems have been proposed. These models were valid for the case of single-line-to earth fault in isolated neutral MV networks. In this paper, the extended earthing system is analyzed in the case of a resonant earthed neutral MV network. …

resonant earthed neutral systeminterconnected earthing systemextended earthing systemMV/lv substations.
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