Search results for "Earthing system"

showing 10 items of 33 documents

Finite-Difference Time-Domain Simulation of Tower and Grounding Subjected to Lightning

2015

In this paper the behavior of a tower and its grounding system, subjected to a lightning, is faced. Finite difference time domain (FDTD) method has been chosen in order to study the non-linear time domain behavior of the system. The electromagnetic problem has been described by using two type of first order time derivative equations: Maxwell's equations and Telegraph equations. Aim of this work is to evaluate the possibility of a flashover between tower and power line, by considering different cases of study.

EngineeringGroundbusiness.industryMathematical analysisElectrical engineeringFinite-difference time-domain methodSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciEarthing systemLightningPower (physics)Settore ING-IND/31 - Elettrotecnicalightning grounding towerTime derivativeTime domainbusinessTower
researchProduct

A Method to Evaluate Voltages to Earth During an Earth Fault in an HV Network in a System of Interconnected Earth Electrodes of MV/LV Substations

2008

An easy and swift method to evaluate, in a system of interconnected earth electrodes, earth potentials on earthing systems of medium-voltage/low-voltage (MV/LV) substations, in an event of single-line-to-earth fault inside a high-voltage/medium- voltage (HV/MV) station, is presented. The advantage of the method is the simplicity of the mathematical model for solving complex systems of any size with a sufficient accuracy for practical purposes. This paper shows the results of simulations, performed on networks with different extensions and characteristics, organized in easy-to-read graphs and tables. A comparison of these results with the values obtained according to the procedure explained …

EngineeringGroundbusiness.industryinterconnected earthing systemElectrical engineeringGESEnergy Engineering and Power TechnologyHigh voltageEarthing systemFault (power engineering)earth faultElectronic engineeringglobal earthing systemElectrical and Electronic EngineeringEarthing global earthing systems power systems faultsbusinessPower-system protectionLow voltageElectrical impedanceVoltageIEEE Transactions on Power Delivery
researchProduct

A new model for a safety analysis in a system of earthing systems interconnected through bare‐buried conductors

2009

PurposeThe purpose of this paper is to present a mathematical model for studying the effects of the interconnection through bare‐buried conductors (BBC) of the secondary substations' earthing system of an urban area.Design/methodology/approachThe developed methodology is based on three main points: the solution of the transmission lines' equations for the formulation of a lumped parameters model of a BBC considering the conductive effect; the division of the distribution network into simpler sub‐systems; and the calculation of all the voltages and currents of the medium voltage (MV) network and of the earthing systems using a multiport approach.FindingsThe methodology has been applied to va…

EngineeringInterconnectionDistribution networksbusiness.industryApplied MathematicsElectrical engineeringDivision (mathematics)Earthing systemComputer Science ApplicationsElectric power transmissionComputational Theory and MathematicsElectronic engineeringElectrical and Electronic EngineeringbusinessReduction (mathematics)Electrical conductorVoltageCOMPEL - The international journal for computation and mathematics in electrical and electronic engineering
researchProduct

DOUBLE EARTH FAULT EFFECTS IN PRESENCE OF INTERCONNECTED EARTH ELECTRODES

2009

The paper presents a study on the effects of double earth faults in Medium Voltage (MV) networks, in presence of electrical interconnection of the earthing systems of the secondary substations. In urban areas, indeed, the earth electrodes of the secondary substations are interconnected and, in many cases, they are also connected to the earth electrodes of the primary stations, in order to realize quasi-equipotential surfaces, intrinsically safe against electric shocks, named Global Earthing Systems (GES). The concept of GES has been introduced in the technical literature ten years ago in the Document HD 637 S1 by CENELEC, with the aim of providing a solution to the problems of designing and…

EngineeringInterconnectionbusiness.industryElectrical engineeringEarthing systemPhysics::GeophysicsGround Fault Safety Circuit MethodComputer Science::Hardware ArchitecturePhysics::Space PhysicsElectrodeAstrophysics::Earth and Planetary AstrophysicsbusinessEarth (classical element)Voltage
researchProduct

The Quest for Global Safety

2007

The authors present a systematic study on the factors that have influence on the establishment of the safety conditions ensuring the rise of Global Earthing Systems. Starting from the definition of Global Earthing System given by CENELEC Document HD 637 SI and from the results of the studies done on the last years on the interconnected earthing systems inside MV networks, the paper proposes some directions of deepening on the topic of Global Safety. Some of the themes whom the paper deals with are: the correct definition of proximity, interconnection and quasi-equipotentiality of the earth electrodes belonging to a Global Earthing System; the influence of the presence of HV/MV stations on h…

EngineeringInterconnectionbusiness.industryGroundElectrical engineeringEarthing systemFault (power engineering)Reliability engineeringlaw.inventionSettore ING-IND/33 - Sistemi Elettrici Per L'EnergialawCLARITYGrounding Earth Electrodes Substations Voltage High definition video Satellite ground stations Enterprise resource planning Electrical safety Electrical accidentsbusiness
researchProduct

On the effects of HV/MV stations on global grounding systems

2016

The METERGLOB project has faced the issue of the identification of Global Grounding Systems. One of the main point of the problem is to define if an interconnection of single grounding systems gives place to a Global Grounding System in any condition and for every kind of ground fault. This paper focuses the attention on what happens in the case of single line to ground fault inside a HV/MV station whose ground electrode is connected to the cable' shields of the MV lines outgoing the station and supplying the secondary substations of a given area.

EngineeringInterconnectionbusiness.industryGroundRenewable Energy Sustainability and the EnvironmentElectrical engineeringShieldsEnergy Engineering and Power TechnologyEarthing systemSingle lineGlobal Grounding SystemSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaGround-penetrating radarGround faultElectronic engineeringPoint (geometry)Electrical and Electronic EngineeringbusinessElectrical conductorHV/MV station
researchProduct

A practical method to test the safety of HV/MV substation Grounding Systems

2015

The adequacy of a Grounding System (GS) to the safety conditions has to be periodically tested by measurements. The test methods and techniques used to verify the electrical characteristics of the GS include the measurements of step and touch voltages. The goal of the test is to verify that touch voltage and step voltage remain below a safe value in all the zones of the installation. The measurements can present some operational difficulties. The purpose of this paper is to present the procedure, step-by-step, of a practical method of measuring touch/step voltages in grounding systems located in urban or industrial areas with reduced accessibility. The suggested method uses auxiliary curren…

Engineeringbusiness.industryGroundEnergy Engineering and Power Technologyglobal grounding systemground potentialgrounding systemEarthing systemelectrical safety; global grounding system; ground potential; grounding system; electrical and electronic engineering; energy engineering and power technologyElectrical safety; grounding system; Global Grounding System; Ground potentialTest (assessment)Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaElectronic engineeringElectrical and Electronic EngineeringbusinessSimulationVoltageElectrical safety
researchProduct

Finite-Difference Time-Domain Simulation of Towers Cascade Under Lightning Surge Conditions

2015

In this paper, the simulation of towers cascade under lightning surge conditions is presented. Finite-difference time-domain method is used to solve both the Maxwell's and telegraph equations. Maxwell's equations and the time-domain resistivity model of Darveniza are used to simulate the nonlinear behavior of the grounding system. Telegraph equations are used to describe the propagation in the overhead lines. Multiple ionizations, on different grounding electrodes belonging to various towers, can be implemented simultaneously, without making assumptions on the shape of the ionized areas.

Engineeringbusiness.industryGroundFinite difference methodElectrical engineeringFinite-difference time-domain methodMechanicsSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciEarthing systemIndustrial and Manufacturing EngineeringFinite-difference time domain (FDTD) grounding ionization lightning Maxwell’s equationsNonlinear systemSettore ING-IND/31 - ElettrotecnicaControl and Systems EngineeringCascadeLightning surgesOverhead (computing)Electrical and Electronic Engineeringbusiness
researchProduct

The Global Grounding System: Definitions and guidelines

2015

The present paper presents the preliminary results of the ongoing Italian METERGLOB project on the contribution given by the exposed conductive parts to a Global Grounding System. One of the expected results of METERGLOB is to carry out guidelines for the identification of a Global Grounding System. These guidelines must be defined on the basis of the definitions and methods present in the current international standards on grounding and safety. In the paper some definitions and elements to be taken into account for the identification of a Global Grounding System are given.

Engineeringbusiness.industryGroundMechanical engineeringEnergy Engineering and Power TechnologyDefinitionsDefinitionGuidelinesGuidelineEarthing systemGlobal Grounding System; Ground Fault; Guidelines; DefinitionsGlobal Grounding SystemSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaIdentification (information)Definitions; Global Grounding System; Ground Fault; Guidelines; Electrical and Electronic Engineering; Energy Engineering and Power TechnologySettore ING-IND/31 - ElettrotecnicaRisk analysis (engineering)Ground FaultElectrical and Electronic Engineeringbusiness
researchProduct

Earthing system’s design in presence of non-uniform soil

2007

The authors propose a practical approach for facing the problem of the design of the earthing systems in two-layer soils. The approach is based on the calculation of an equivalent resistivity of the non-uniform soil through which the designer can treat this one as it was uniform. The purpose of the Authors is to provide an innovative simple method and some easy-to-use graphs for an easy earthing systems' design in two-layer soils.

Engineeringbusiness.industrySimple (abstract algebra)GroundControl engineeringbusinessEarthing systemGeneralLiterature_MISCELLANEOUSReliability engineering2007 9th International Conference on Electrical Power Quality and Utilisation
researchProduct