Okun O. A Restriction of the Ecological Impact of High Voltage Power Substations by Reducing Electromagnetic Field Levels

Object of study – a power frequency electromagnetic field of high voltage electrical power objects. Aim of the dissertation study – a definition of the electromagnetic environment produced by high-voltage power substations, located in the city area, and limiting of the impact of the power frequency electromagnetic field of power substations on the population and the environment. Methods of study – theory of the electromagnetic field and theoretical electrical engineering; numerical finite element and finite integration methods; method of images, methods of the measurement of the magnetic flux density of a 110-kV power line. Theoretical and practical results – a possibility of reducing exposure to the power frequency electromagnetic fields, generated by high voltage power substations, at the design stage. Novelty – it has been further developed conditions of current and voltage setting in busbar wires of power substations and power lines with the horizontal arrangement of wires through the replacement of electric and magnetic field calculation at each moment of time during the power frequency period by three instant states that corresponds to maximum field values in proximity to and far from the wires. It has been improved a computational model of metal structures with complex geometry at substations and overhead power lines through the replacement of such structures by polyhedra with zero potential that allowed to unify modeling of these structures. It has been offered a method of limiting the magnetic field generated outside the territory of high voltage power substations by means of symmetric phase sequence of busbar wires of neighboring cells and layers that allows to reduce the impact of the substation's fields on the population and the environment. Implementation level – results of the study have been implemented in "Kharkivoblenergo" (Kharkiv), "Ukrenergomeregproekt" (Kharkiv) as well as in educational process of electric power transmission chair of NTU "KPI", namely in lecture courses "Design of Power Lines and Substations", "System-Forming Networks and Systems" and "Technology and Electrophysics of High Voltage". Area of application – power industry, educational process.