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Liu J.,Safe Engineering Services and Technologies Ltd | Dawalibi F.P.,Safe Engineering Services and Technologies Ltd
Proceedings - International Conference on Future Power and Energy Engineering, ICFPEE 2010 | Year: 2010

The design of a wind farm grounding system including the substation and wind turbine generators of the collector network is a very comprehensive task. Powerful integrated grounding simulation methods and design techniques that are appropriate for carrying out this kind of work are presented and discussed in this paper. They include soil structure model selection based on in-situ soil resistivity test data, current distribution calculations for phase-to-ground faults at the substation and wind turbines, design of the substation and wind turbine grounding systems and safety evaluations of the grounding systems. The methods and techniques presented in this paper can be used as a reference guide when designing grounding systems of a large wind farm network. © 2010 IEEE. Source


Ma J.,Safe Engineering Services and Technologies Ltd | Dawalibi F.P.,Safe Engineering Services and Technologies Ltd
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2010

This paper presents a grounding study for a solar power generation facility. The procedures of the grounding study are described and computation results are presented. The special considerations introduced in the grounding study by the physical characteristics of solar power generation facilities are discussed. The procedures and the special considerations presented in this paper can be used as a guide when carrying out grounding analysis of a solar power generation facility. ©2010 IEEE. Source


Ma J.,Safe Engineering Services and Technologies Ltd | Dawalibi F.P.,Safe Engineering Services and Technologies Ltd
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2012

The effect of backfill on the performance of the grounding system of a substation is studied in this paper. The backfill is simply the replacement of the existing soil surrounding the grounding grid with a different soil. When the backfill soil resistivity is higher than the original soil resistivity, the touch voltage is higher compared with the case where no backfill is used; the step voltage can also be slightly higher. When the backfill soil resistivity is lower than the original soil resistivity, the touch voltage is lower compared with the case where no backfill is used but the step voltage is significantly higher. An approximate method for modeling the backfill in a multilayer soil is also presented. © 2012 IEEE. Source


Li Y.,Safe Engineering Services and Technologies Ltd | Dawalibi F.P.,Safe Engineering Services and Technologies Ltd | Ma J.,Safe Engineering Services and Technologies Ltd
Advanced Materials Research | Year: 2012

Grounding system analysis and design considerations for large hydroelectric power plant are analyzed and discussed in this paper. The main work that has been carried out includes: constructing adequate soil structures and analyzing the effects of the finite heterogeneous soil structure, the modeled river length and the water reservoir levels; conducting accurate fault current distribution calculations and studying the influence of circulating current on the touch and step voltages. The paper discusses the design of the grounding system and its safety performance while considering the impact of the circulating current and inductive coupling from cables and long parallel conductors inside the plant. Two practical examples have been provided in this paper. Furthermore, the paper demonstrates the effectiveness of using heterogeneous finite soil volumes to analyze large hydroelectric power stations and confirms that accurate grounding software packages are required to account for large circulating currents within the ground conductors and strong inductive coupling that exists between metallic elements within the substation. The results and discussions presented here can be used as a reference for engineers to analyze extensive grounding systems and to design appropriate grounding systems for large hydroelectric power plant. © (2012) Trans Tech Publications. Source


Hajiaboli A.,Safe Engineering Services and Technologies Ltd | Fortin S.,Safe Engineering Services and Technologies Ltd | Dawalibi F.P.,Safe Engineering Services and Technologies Ltd
IEEE Transactions on Industry Applications | Year: 2015

This paper presents an analysis of high-voltage direct current sea electrodes using different numerical techniques. The large volume of sea water that must be included in the analysis is represented using infinite (inclined layer model) and finite models (finite volume and hemispheroidal models). The comparison between the results obtained using these models is based on the potential rise of the electrode, the sea potential rise in the vicinity of the electrode, and the computational burden for utilizing each model. The analysis shows that the results obtained using finite models can predict the performance of the electrode more accurately and realistically. © 1972-2012 IEEE. Source

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