Title
Performance of the recursive methods applied to compute the transient responses on grounding systems
Date Issued
01 July 2021
Access level
metadata only access
Resource Type
journal article
Author(s)
São Paulo State University-UNESP
Publisher(s)
Elsevier Ltd
Abstract
Ground Potential Rise (GPR) is an important factor for a grounding system that must be properly designed to protect people against any dangerous induced voltages and to avoid damages in equipment. In this context, several approaches to assess GPR are available in the literature which can be developed either directly in time domain or frequency-to-time transforms. The purpose of this paper is to investigate the performance of two time-domain recursive methods to compute the transient GPR in grounding systems generated by different lightning currents. First, the grounding impedances are calculated by a full-wave electromagnetic software FEKO with numerical Method of Moments from 100 Hz to 5 MHz. The GPRs are assessed by a recursive convolution method (M1) and by a recursive trapezoidal integration method (M2). Both methods employ the Vector Fitting technique on each impedance curve adjusted into a poles-residues form. Then, simulation results from the recursive methods are compared with those obtained with frequency-to-time method using the Numerical Laplace Transform (NLT) and with the equivalent circuit incorporated in the ATP-software. Results show a good agreement between the responses from recursive methods in comparison with those from NLT and ATP-software. As advantages, the recursive methods are an alternative tool when no analytical expressions for lightning currents are known or only measured data is provided. Additionally, the circuit implementation in Electromagnetic Transient (EMT)-type software tools is not needed to compute the transient GPRs in time domain. This work is an extension of a 2019-SIPDA conference paper [1].
Volume
196
Language
English
OCDE Knowledge area
Sistemas de automatización, Sistemas de control
Ingeniería eléctrica, Ingeniería electrónica
Subjects
Scopus EID
2-s2.0-85104640196
Source
Electric Power Systems Research
ISSN of the container
03787796
Sponsor(s)
This study was financed by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001, by the Brazilian National Council for Scientific and Technological Development (CNPq) and by the São Paulo Research Foundation (FAPESP grant: 2019/01396-1)
Sources of information:
Directorio de Producción Científica
Scopus