Devising a method for reducing active power corona losses based on changing the structural parameters of a power transmission line

Olubakinde, Eniola; Danylchenko, Dmytro; Nazarenko, Ihor; Савченко, Наталя; Shylkova, Larysa

doi:10.15587/1729-4061.2022.253384

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…Пер-ший з них -час 1τ від початку застосування номінального робітника напруги до зародження будь-яких первинних дефектів (для полімерів у виді деревоподібних каналів, заповнених газом). В нормальних умовах експлуатації 1τ може досягати значень порядку багатьох років [2], [7] без помітне зниження електричної міцності.…”

Section: аналіз досліджень і публікаційunclassified

Simulation of the electric field of a polymeric insulator bushing to determine the field concentration points

Shevchenko¹,

Danylchenko²,

Vyazovichenko³

et al. 2022

Elektroteh. elektroenerg.

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Purpose. The use of modeling as a tool that allows you to identify design weaknesses in electrical equipment and, on their basis, perform its optimization in order to level weaknesses due to design imperfections. Designation of a real problem in the design of polymer bushings, which negatively affects their technical, economic and operational characteristics and makes them less competitive compared to other types of insulators. Methodology. Analysis of experiments to detect partial discharges, simulation of electric field strength, synthesis of analyzed works and simulation results. Findings. As a result of the performed scientific research, it was found that the process of partial discharges has a direct effect on the electrical strength of the polymer bushing insulator. This fact is taken as the basis for searching for methods of further influence on the design of the insulator in order to increase its service life. It was found in the work that the reason for the occurrence of partial discharges is the uneven distribution of the electric field strength. This was the reason for further study of the electric field strength of the pass-through insulator and its modeling. As a result of the simulation, points of concentration of the electric field strength in the bushing polymer insulator were found and designated as points of action to increase the electrical strength of the bushing polymer insulator. Originality. The scientific novelty of the performed research work lies in the use of the simulation of the electric field of a polymer bushing as a tool for detecting weak points in its design, when exposed to which, a positive effect on its technical characteristics can be observed. Practical value. The practical value of the research work done is that the results of the research serve as a solid foundation for further optimization of the design of polymer bushings, which will lead to a positive impact on their technical characteristics and make them competitive compared to other types of insulators.

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Section: аналіз досліджень і публікаційunclassified

Simulation of the electric field of a polymeric insulator bushing to determine the field concentration points

Shevchenko¹,

Danylchenko²,

Vyazovichenko³

et al. 2022

Elektroteh. elektroenerg.

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“…Для прийнятих висоти та взаємного розташування фазних проводів та грозозахисних тросів розраховуються напруженості поля на поверхні проводів залежно від відстані між фазами для різних поєднань кількості проводів у фазі, діаметра одиночного проводу та кроку розщеплення [12].…”

Section: вступunclassified

Investigation of the influence of bundled conductor capacitance on power loses associated with corona discharge

Olubakinde

2022

Bull. Nat. Tech. Univ. "KhPI". Ser.: Energy: Reliab. Energy Eff

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The determining factor for the presence of a corona is the value of the charge of the wire, which determines the intensity of the electric field. Quantitative characteristics of the charge value of the line phase depend on the capacity and voltage. If the influence of voltage on corona losses has been studied by many authors, the influence of capacity is practically not studied. This is primarily due to the fact that the constructive implementation of the split phase of the overhead line was very carefully determined by regulatory documents. In our opinion, today there are all possibilities for changing the designs of phases and, accordingly, their capacities. This became possible thanks to a change in approaches to the design of the structure of the phase wire on the substation. Determination of the electric capacity of the overhead line with bundled conductors is quite often performed using equivalent parameters, such as equivalent suspension height and equivalent radius. This approach makes it possible to obtain average values of the phase capacity of the overhead line. For a detailed analysis of the effect of capacity on corona losses, it is necessary to determine more reliable values of capacities and use them in calculations of corona losses. The capacity of the phase is determined by the geometric dimensions of the split phase. The obtained results indicate a very strong dependence of corona losses on the capacity of the split phase. When approaching a grounded object, the phase capacity can significantly increase. A vivid example of such an increase is the approach of bundled conductors to the elements of overhead line supports. The distances to the ground in this case will be smaller than the equivalent height of the suspension, which is used in the calculations of the specific losses per crown to determine the capacity of the phases of the overhead line. It is necessary to take into account possible changes in the capacity of the split phase at the stage of designing the overhead line. Another result of the calculations was a much greater influence of the capacity of the middle phase on the amount of losses per corona. This makes it possible to reduce corona losses due to the appropriate design of the middle phase of the overhead line, for example, by changing its splitting radius.

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