Sensitivity analysis of experimentally determined grounding grid impulse characteristics

Abstract

The paper presents an experimental determination of the grounding grid impulse characteristics procedure. The measuring circuit configuration and characteristics of the applied equipment arc given. Some of the numerous experimental results for three grounding grid configurations are presented. The paper provides the analysis of the results obtained for various impulse current shapes, magnitudes and discharge points. The results shown are related to the cases without soil ionization around the grid elements.

Fixed-Image-Method-Based Transient Electromagnetic Model of Grounding System in Horizontally Stratified Multilayer Medium

“…In the following three numerical examples results obtained using the presented transient electromagnetic model will be compared to measured data [18] and to results computed using full electromagnetic models from literature [19,20]. In the first numerical example comparison is made with results computed using a full electromagnetic model and results obtained by measurement in two-layer earth on a simple grounding system [18,19].…”

“…In the first numerical example comparison is made with results computed using a full electromagnetic model and results obtained by measurement in two-layer earth on a simple grounding system [18,19]. In the second numerical example comparison is made with results obtained using a full electromagnetic model in homogeneous earth on a complex grounding system [20].…”

“…In this example, results obtained by the proposed model will be compared to measured data from [18] and results obtained by a full electromagnetic model which numerically solves Sommerfeld integrals [19]. The observed grounding system is depicted in Fig.…”

“…The resistivity of the first layer is 50 Ωm, and relative permittivity of the first layer is 10, whereas the resistivity of the second layer is 26 Ωm with the same permittivity as the first layer. In the conducted experiment from [18], impulse current is injected into the grounding system in point A, and scalar electric potential is measured and computed in that same point. Actual measured injected current along with its double-exponential approximation used for simulation is depicted in Fig.…”

Time-Harmonic Current Distribution on Conductor Grid in Horizontally Stratified Multilayer Medium

“…It needs to be stated that contrary to the vast number of simulation oriented papers, there is a great deficiency of carefully documented papers concerned with experimental works on transient grounding grid behavior. Noteworthy exemptions to this rule are given in, e.g., [13][14][15].…”