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This paper presents an extended TLM-2D numerical technique. Extensions include simultaneous consideration of non-homogenous media and ionization phenomena representation. Performance evaluation and representation of impulsive grounding systems embedded in concrete are considered as a study case. Analysis based on the Alternative Transients Program (ATP) and field measurements with different grounding...
The power distribution sector is facing high operational costs due to penalties related to poor power quality delivered to sensitive customers. In order to improve the power quality a broader assessment is needed. This paper proposes a harmonic distortion assessment method based in the state estimation technique. This method is intended to assess harmonic distortion where there are not measurement...
This paper presents a comparative study of impulsive grounding systems encased in concrete (namely UFER grounding). Several topologies used in transmission and distribution networks as well as in industrial plants were evaluated considering soils with different properties. Scale measurements (in an electrolytic tank with soil) were carried out in order to quantify the performance of this grounding...
This paper presents a systematic study of impulsive grounding systems embedded in concrete. Several topologies used in transmission and distribution networks as well as in industrial plants were evaluated considering soils with different properties. Case study analysis using the Alternative Transients Program (ATP) and real life measurements in scaled configurations were carried out. The aim of this...
This paper presents the development of an analytical formulation for estimating the potential on the soil surface, caused by electric current calculated on a grounding conductor. The formulation has a great significance in its use in conjunction with 1-D numerical methods, which are not able to determine such potentials directly. The proposed study focuses on lightning surges considering the frequency...
This paper presents the EMC (Electromagnetic Compatibility) philosophy applied to design the grounding systems of GIS Insulated Substation - GIS indoor substation. The grounding systems are characterized by the following subsystems: Main Grounding grid (60 Hz Grounding System), Equipotential Grounding grid (HF Grounding system) and Lightning Grounding system. The real case measurements for 100 MVA,...
This paper presents a study which analyzes the performance of rural distribution lines against the occurrence of lightning. The ATP-Draw program was used to simulate the electromagnetic phenomena and to evaluate the transients caused by lightning discharges. The model of the distribution system is based on the representation of its elements (poles, insulators, equivalent circuit, cross-arm and grounding...
This paper presents a sensitivity assessment of a 23kV distribution feeder subject of indirect lightning. The study focuses in a comparative performance analysis of different configurations poles. Four distribution lines topologies performance are assessed. ATP program was used to simulate the electromagnetic phenomena and to evaluate the transients caused by induced lightning discharges.
Energy supply is a significant resource for economic and social development. Power systems statistics shows that the lightning phenomenon is one of the most important causes of power systems outage. In this context, the paper present a study of the performance of a 23kV distribution line related to the occurrence of direct lightning in a particular point of the system, with focus in a comparative...
This paper presents a study of the behavior of distribution feeders against lightning, where the magnitude of the surge caused by this phenomenon is calculated. The feeder model and the lightning phenomena have been implemented in the electromagnetic transients program ATP-Draw. The magnitudes of the surges are obtained by numerical simulations in this program. Simulations were performed for cases...
The focus of this study is to analyze the performance of a distribution line struck by direct lightning in a particular point of its length. In this paper the analysis is based on the flashover and backflashover calculation due to lightning using the Alternative Transients Program — ATP. Parametric studies using this software are also performed to determine the sensitivity of the flashover and backflashover...
This paper presents a study about the influence of the wire-guard as a protection system in overhead distribution line in comparison with unprotected topology against lightning. A real feeder was considered as a case study using ATP-EMTP software. Practical aspects related to the modeling of a distribution line are presented. Simulation results show that the shielding configuration ensures a protection...
This article addresses a wide three-phase voltage sag characterisation, including sag magnitude, phase-angle jump, and duration. A signal-processing algorithm is proposed to obtain voltage sag characteristics for phase voltages and positive sequence voltage. The proposed methodology is applied to a set of actual measurements obtained from a power quality monitor and from a synchrophasor measurement...
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