الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The main goal of this thesis focuses on the investigation of the electric field distributions inside a typical 500/220 kV open distribution substation under actual loading conditions and during different working conditions, Hot-Stick position and Bare-Hand position. Moreover, the assessment of the human exposure to these fields is investigated by calculating the induced currents and current densities inside the workers body during different working conditions and at different positions inside this substation. This study will serve for planning service works or for inspection of equipment inside high voltage (HV) substations with regarding the safety of workmen.
The developed computer model for this substation is based on three dimensional (3D) charge simulation technique (CSM). To validate the electric fields calculated by the computer model, real measurements are performed inside this typical substation. The electric field distribution is investigated also at height levels of 8m, 11m, 14m and 17m above ground to represent the positions of live line maintenance (Bare-Hand position). Moreover these values of electric field are compared to international guidelines for personnel exposure to electric field to stand upon how much of deviation and how much of risk to which the workers are exposed.
In the final phase in this thesis, a computer model is developed to simulate the human body in proximity to substation’s equipment. This model is used to calculate the induced current densities and currents inside the different tissues of human body, and compare these values with the recent published standards for electric field exposures to ensure worker safety and to ensure safe operation inside this substation. The human body is allocated in different positions inside this substation and at different working conditions (Hot-Stick positions and Bare-Hand positions) taking into account the different profiles and shapes for human body.
This thesis is a preliminary example of the work of engineers. It is the actual application of pure science in the design and construction of a practical system such as design of high voltage substations, transmission system. Implementing the results of this thesis will decrease the impact of high voltage substations on the surrounding environment while maintaining the safety of the workers and the reliability of the equipment.