Numerical calculation of floating potentials for large earthing system

Zildzo, Hamid; Muharemović, Alija; Turkovic, Irfan; Matoruga, Halid

doi:10.1109/icat.2009.5348400

Cited by 8 publications

(9 citation statements)

References 4 publications

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“…But then, an additional equation is needed. This equation is precisely the charge condition in (4). This condition can be expressed as…”

Section: B Discontinuous Galerkin Formulationmentioning

confidence: 96%

“…Furthermore, in many applications these conductors are isolated, in other words, the value of the potential on their surface is not defined or fixed [1]- [10]. For example, electrode core of high-voltage inductors [1], floating electrodes of IEC surge arresters [2], defects in ultra-high-voltage gas-insulated switchgear [3], passive electrodes of earthing systems [4], conductor of floating-gate transistors [5], plasma analyzer for spacecraft floating potential measurements [6], and metallic nanostructures in optoelectronic devices [7] can all be modeled as isolated conductors in electrostatic simulations. In the rest of this paper, these conductors are referred to as floatingpotential conductors (FPCs).…”

Section: Introductionmentioning

confidence: 99%

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Modeling Floating Potential Conductors Using Discontinuous Galerkin Method

2020

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Isolated conductors appear in various electrostatic problems. In simulations, an equipotential condition with an undefined/floating potential value is enforced on the surface of isolated conductors. In this work, a numerical scheme making use of the discontinuous Galerkin (DG) method is proposed to model such conductors in electrostatic problems. A floating-potential boundary condition, which involves the equipotential condition together with a total charge condition, is ''weakly'' enforced on the conductor surfaces through the numerical flux of the DG method. Compared to adaptations of the finite element method used for modeling conductors, this proposed method is more accurate, capable of imposing charge conditions, and simpler to implement. Numerical results, which demonstrate the accuracy and applicability of the proposed method, are presented. INDEX TERMS Discontinuous Galerkin method, electrostatics, finite element method, floating potential conductors, magnetostatics, plasmonic-enhanced photoconductive antenna.

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“…But then, an additional equation is needed. This equation is precisely the charge condition in (4). This condition can be expressed as…”

Section: B Discontinuous Galerkin Formulationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Modeling Floating Potential Conductors Using Discontinuous Galerkin Method

2020

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“…On the other, the soil is considered to be homogeneous, or with limited inhomogeneity, and the size and resistivity of the conductors are neglected. The first limitation has been overcome by using a layered soil model in the application of BEM while maintaining the other simplifications [34,35]. In the case of multiple layer models, the application of the "method of images" enables relevant improvement in convergence rate while managing the maximum admissible error [36], but the computation of the boundary integrals remains a very hard task due to the presence of singularity and of Green functions expressed by series.…”

Section: Overview Of Finite Element Analysis For the Evaluation Of The Potential Transfer From Isolated Grounding Systemsmentioning

confidence: 99%

Thin Conductor Modelling Combined with a Hybrid Numerical Method to Evaluate the Transferred Potential from Isolated Grounding System

Aiello¹,

Alfonzetti²,

Rizzo³

2019

Energies

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Grounding systems are essential parts of substations and power generation stations. The evaluation of transferred potentials from an active grounding system to other passive ones or to any near conductors is an important aspect to be considered, because transferred potentials may cause serious and fatal events. Moreover, it is an intrinsic issue of the Smart Grid where the ground systems of the power and ICT systems could be close to each other. Therefore, the estimation of the transferred potential is necessary at grounding system design stage for people safety and electric components safeguard. Numerical methods are the best choice to perform a truthful estimation, especially when large and complex grounding systems have to be designed. However, this task is complicated by the “unbounded” nature of the electromagnetic field and by the presence of components of extremely different size in the analysis domain. In this paper, an efficient hybrid finite element method is applied for the accurate and fast computation of transferred earth potentials from grounding systems. Moreover, the small dimensions of the components in the analysis domain are taken into account by the use of one-dimensional finite elements inserted in the tetrahedral mesh. It is worth mentioning the additional advantage of obtaining the electric potential on the earth surface without any post-processing operation.

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“…In real GSs, we should take into account not only the conductors directly involved in the installation to be protected, but also any other conductor, connected to it or not, that can interact with the whole GS in case of activation [3]. The transfer of potentials between the grounding area and outer points by buried conductors, such as communication or signal circuits, neutral wires, pipes, rails, or metallic fences, may produce serious safety problems [4], [5].…”

Section: Introductionmentioning

confidence: 99%

“…The situations in which such a GS is indicated ranges from fault currents in electrical systems due to a malfunction, to an eventual lightning stroke. In any situation, the main target of a GS is to ensure that their electrical resistance is low enough to guarantee that fault currents dissipate mainly through the grounding grid into the earth, while maximum potential differences between close points on the earth's surface must be kept under certain tolerances (step, touch, and meshIn real GSs, we should take into account not only the conductors directly involved in the installation to be protected, but also any other conductor, connected to it or not, that can interact with the whole GS in case of activation [3]. The transfer of potentials between the grounding area and outer points by buried conductors, such as communication or signal circuits, neutral wires, pipes, rails, or metallic fences, may produce serious safety problems [4], [5].…”

mentioning

confidence: 99%

Interaction Between Interconnected and Isolated Grounding Systems: A Case Study of Transferred Potentials

Faleiro

Pazos

Asensio

et al. 2015

IEEE Trans. Power Delivery

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Abstract-The effect caused by ground fault current in a complex system of interacting electrodes is theoretically studied. The calculation applies to a specific case in which a set of interconnected electrodes, which are part of a grounding facility network, are activated by a ground fault current. Transferred potentials to adjacent passive electrodes are calculated and the most relevant parameters of the electrode system are evaluated. Finally, the convenience of connecting the grounding electrodes is discussed.Index Terms-Transferred potentials, grounding analysis, thin wire structures, earth fault, Method of Moments. I. INTRODUCTIONhe grounding systems (GS) are an essential part of the distribution networks of electrical power. Proper design of these systems prevents the occurrence of anomalous potential that can be dangerous to people and damage sensitive equipment and other neighboring facilities. The situations in which such a GS is indicated ranges from fault currents in electrical systems due to a malfunction, to an eventual lightning stroke. In any situation, the main target of a GS is to ensure that their electrical resistance is low enough to guarantee that fault currents dissipate mainly through the grounding grid into the earth, while maximum potential differences between close points on the earth's surface must be kept under certain tolerances (step, touch, and meshIn real GSs, we should take into account not only the conductors directly involved in the installation to be protected, but also any other conductor, connected to it or not, that can interact with the whole GS in case of activation [3]. The transfer of potentials between the grounding area and outer points by buried conductors, such as communication or signal circuits, neutral wires, pipes, rails, or metallic fences, may produce serious safety problems [4], [5]. It is also important to take into account the metal structures of the neighboring buildings of the protected area because there may appear transferred contact potentials out of the tolerance range [6], [7]. The ground potential rise (GPR) due to electrical current dissipation to the ground is a well known and studied phenomenon from the equations of electromagnetism [8]. However, in practical situations, many difficulties may appear which greatly complicate obtaining a solution. The shape of the electrodes and their spatial arrangement together with the possible interconnection of some of them, establish multiple boundary conditions added to the problem which can greatly complicate reaching an acceptable solution, which is obtained in most cases by applying numerical methods [9]-[12].In this paper, we consider a section of the electric power network of an urban area, where several Secondary Substations (SS) can be found together with their corresponding GS. In the case of study, the GSs of all the SS considered, are interconnected via the underground cable shield that transmits power to the SS. Besides ensuring an equal electric potential of all the interconnected GS electrodes, ...

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Numerical calculation of floating potentials for large earthing system

Cited by 8 publications

References 4 publications

Modeling Floating Potential Conductors Using Discontinuous Galerkin Method

Modeling Floating Potential Conductors Using Discontinuous Galerkin Method

Thin Conductor Modelling Combined with a Hybrid Numerical Method to Evaluate the Transferred Potential from Isolated Grounding System

Interaction Between Interconnected and Isolated Grounding Systems: A Case Study of Transferred Potentials

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