Modelling and live measurements of step and touch voltages at LV customers in urban areas caused by MV faults

Erp, F. T. J. Van; Provoost, F.; Deursen, A.P.J. van; Hesen, P.L.J.

doi:10.1049/cp:20051001

Cited by 9 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So grid "properties" like neutral point's treatment, short-circuit power, fault location, fault type, cable properties, pylon grounding impedances, ground wire properties and LV grid configuration (TT-or TN-system) with MV connected neutral have an influence on voltage hazards such as touch and step voltages [10]. Different simulation models to calculate the current distribution during a phase to ground fault in a CGS have been published in the last years [6], [10] and [12]. Also experimental work carrying out field tests concerning safety in CGS has been done and published in [7], [12] and [13].…”

Section: Global Earthing Systemsmentioning

confidence: 99%

See 1 more Smart Citation

Verification of global earthing systems

Fickert

Schmautzer

Raunig

et al. 2013

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013)

View full text Add to dashboard Cite

This paper is dealing with the verification of global earthing systems (CGS) with a special focus on dangerous voltages to people (touch and step voltages) and to technical systems (telecommunication lines). CGS are defined in a way that no dangerous voltages occur [2], which might be a weak or incomplete definition. In this paper results from own and published earthing measurements [4], [5], [7], [8] (especially touch voltages) in different areas (city, villages, rural areas) are analyzed and compared to simulation results [6], [9] of global earthing systems. Additionally these results are compared to values of earthing systems of large substations and power plants. Measurements of touch and step voltages inside global earthing systems show that these values are far below given limits in standards. The question arises if this is true in all cases or if there are exceptions.

show abstract

Section: Global Earthing Systemsmentioning

confidence: 99%

“…Different simulation models to calculate the current distribution during a phase to ground fault in a CGS have been published in the last years [6], [10] and [12]. Also experimental work carrying out field tests concerning safety in CGS has been done and published in [7], [12] and [13]. Stockholm, 10-13 June 2013…”

Section: Global Earthing Systemsmentioning

confidence: 99%

Verification of global earthing systems

Fickert

Schmautzer

Raunig

et al. 2013

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013)

View full text Add to dashboard Cite

show abstract

“…One of the possible solutions to this problem is related to the dependence of the currents at the source end of a line on the distance to the short circuit point [5]- [9]. However, there are reasons that decrease the accuracy of the short current point detection, namely: variations in the effective values of the voltage at the transmission line connection point, as well as the dependence of the current amplitude on the voltage phase at the time of short circuit.…”

Section: Introductionmentioning

confidence: 99%

On-Line Determination of the Coordinates of a Short Circuit Point in Transmission Lines

Suslov

Solonina

2017

PEE

View full text Add to dashboard Cite

-One of the challenges facing electric power systems is the failure of overhead and cable transmission lines. Short circuits pose a particular danger. This fact requires increasingly faster information acquisition and processing for estimating a system state and making preventive measures to ensure sustainable power supply with minimum loss of time. This paper is devoted to the problem of on-line determination of the coordinates of a short circuit point in the transmission line. The suggested methods are based on the assumption that the short circuit current at the transmission line beginning depends on the distance to the short circuit point.

show abstract

“…Various methods have been defined for stating under which conditions a group of interconnected earthing systems can be defined a GES. Most of these methods are based on the measurements of the touch voltages (van Erp et al, 2005) or on geometrical criteria (Desmedt et al, 2001;Mosciatti, 2000). While the first approach requires a long time and a considerable monetary commitment for performing the required measurements, the second does not allow to take into account all the electrical elements that contribute to the creation of a GES and is based only on the practical experiences of the utilities on their medium voltage (MV) networks and not on universal parameters.…”

Section: Introductionmentioning

confidence: 99%

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

Zizzo

Campoccia²,

Sanseverino³

2009

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

View full text Add to dashboard Cite

Purpose -The 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/approach -The 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. Findings -The methodology has been applied to various situations giving precious information on the behaviour of the earthing systems interconnected by means of BBC in presence of conductive effect. The results of the simulation allow to quantify the reduction of the dangerous voltages appearing during an earth fault, in presence of interconnection between the secondary substations' earthing systems, realized by means of BBC. Research limitations/implications -Some factors can influence the precision of the methodology. Indeed, for a correct simulation of the system it is necessary to know several electrical and geometrical parameters, among all the resistivity of the soil that, often, is known with a large degree of uncertainty. Practical implications -Utilities are quite interested in this topic. The study of interconnected earthing systems in MV networks with the purpose of identifying safe extended areas named global earthing systems (GES) has important management and economic consequences. Originality/value -The paper presents an original lumped parameters model of the BBC, able to simulate these elements with a high accuracy, also in presence of the conductive effect, and that can be easily included in the more general model of a distribution line, in order to perform the analytical study of the GES in MV networks. The model proposed allows one to overcome the limits of the application to the MV networks of similar models present in the literature for the study of the same topic in the high-voltage networks.

show abstract

Modelling and live measurements of step and touch voltages at LV customers in urban areas caused by MV faults

Cited by 9 publications

References 0 publications

Verification of global earthing systems

Verification of global earthing systems

On-Line Determination of the Coordinates of a Short Circuit Point in Transmission Lines

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

Contact Info

Product

Resources

About