S. Abdullah

Multimedia University, Faculty of Engineering(FOE), Graduate Student

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Investigations of earthing systems under steady-state and transients with FEM and experimental work

International Journal of Electrical Power & Energy Systems, 2013

ABSTRACT In this paper, investigations on the earthing systems with computational method, Finite ... more ABSTRACT In this paper, investigations on the earthing systems with computational method, Finite Element Method (FEM) and experimental work are presented. The earthing systems in this study are of simple built which consist of three earthing systems configurations, 2, 3 and 4 rod electrodes for easy analysis and comparisons. The performance of earthing systems using both simulation and experimental techniques are investigated at power frequency and under transients. It was found that from both FEM and experimental work, the performance of earthing systems under transients is found to be ‘non-linear’ which its non-linearity cannot be neglected. By including the non-linear effect of soil under high currents, more accurate modelling of protective devices and their performance are hoped to be achieved in future.

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Characterizations of a Single Rod Electrode under High Impulse Currents with Different Polarities

by Eng. Nkwa Agbor Etobi (PhD) Arreneke, S. Abdullah, and N. Eng

— Under high impulse currents, an earthing system exhibits different impulse characteristics depe... more — Under high impulse currents, an earthing system exhibits different impulse characteristics depending on the shape and/or design configuration of the earthing system. These characteristics have been seen to be different with respect to its steady-state as highlighted in many studies. Furthermore, in order to ascertain that a correct design of an electrical system is achieved, it is important to evaluate the impulse characteristics of the earthing system under high impulse conditions. So far little emphasis has been given in previous publications to investigate the characteristics of earthing systems under high impulse conditions by field measurements. For this reason, a rather efficient and reliable technique to solve this problem is by conducting a practical analysis (field experiment). This paper investigates the characteristics of a single rod electrode under high impulse conditions by field measurements under different polarities. The single rod is selected in this paper for its simple configuration and installation. It was observed in this study that the resistance of the single rod earthing system was seen to reduce with increasing current magnitudes for both polarities and negative polarity has higher impulse resitance than that of positive polarity.

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S. Abdullah

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