Study of the impact of the technical state of the transformers with the LTC on the parameters of the EES modes optimal control

Rubanenko, Olexander; Kazmiruk, O I; Zyska, Tomasz; Gromaszek, Konrad; Junisbekov, M.

doi:10.1201/9781351243179-7

Cited by 2 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As paper and oil insulation of 330-750 kV equipment is one of the most widespread and responsible elements of electrical equipment of power systems [2,3], special control systems have been created and developed to evaluate its technical condition [4]. In [5,6,7] various methods of operation and diagnosis on the example of power transformers are considered. However, for one diagnostic parameter, it is difficult to detect with certainty a defect of a certain kind.…”

Section: Figure 3 Examples Of Damaged High-voltage Equipment and Pape...mentioning

confidence: 99%

Research processes of oil and paper insulation of high-voltage equipment during operation

Lakshmi¹,

Oleksandr²,

Olena³

et al. 2020

International Conference on Multifunctional Materials (Icmm-2019)

View full text Add to dashboard Cite

The article analyzes the factors that accelerate the aging process of the oil-paper insulation of the condenser type and shorten its service life. Attention is drawn to the fact that the breakdown of flat insulation made of condenser paper occurs at the location of the inclusion, which approximately corresponds to the field of uniform field. An example of damage to the insulation of a current transformer due to its aging and moisture is given. This work was analysed the influence of thickness and density of paper, grade of mineral oil on short-term electrical strength. The characteristics of the insulating papers of the permeable composition largely determine the electrical strength of the paper-oil insulation.Since paper-oil insulation consists of a series of successive layers of paper and oil, it is advisable to present such insulation by the equivalent scheme shown in fig. 1, in which the thickness of the paper-oil dielectric is divided into two layers: paper (fiber) and mineral oil, connected in series. a) b) FIGURE 1.Equivalentpaper-oilinsulationscheme: a -tocalculatethevoltageontheoillayer;btocalculatethedielectriclossininsulation.The increase in the dielectric constant of the paper is accompanied by an increase in the tension in the oil layers of paper and oil insulation, which promotes the development of discharges in these layers and facilitates the breakdown of the insulation. As a result, the effect of paper density has a different effect on the short-term and long-term strength of the insulation. In determining the short-term strength, the influence of the first factor prevails, which contributes to its increase with increasing paper density. For example, by increasing the density of paper from 0.7 to 1.3 g/cm 3 , the electrical strength of sheet insulation (flat samples) increases by 60%.However, in determining the long-lasting strength, partial breakdowns in the oil layers lead to considerable destruction of the insulation. In this case, as the paper density increases, the breakdown strength is reduced and the insulation life is shortened.

show abstract

Section: Figure 3 Examples Of Damaged High-voltage Equipment and Pape...mentioning

confidence: 99%

Research processes of oil and paper insulation of high-voltage equipment during operation

Lakshmi¹,

Oleksandr²,

Olena³

et al. 2020

International Conference on Multifunctional Materials (Icmm-2019)

View full text Add to dashboard Cite

show abstract

Assessment of Environmental, Social, Governance and Technogenic Components of Investment Risks

Atoyev

Knopov

2022

Cybernetics and Computer Technologies

View full text Add to dashboard Cite

Introduction. To assess the investment attractiveness (IA) and development opportunities for investment objects (IO), non-financial factors characterizing the environmental, social, governance and technogenic (ESGT) features of objects of possible financing have been increasingly used recently. The purpose of this data analysis is to establish how the ESGT-parameters of IO may reflect their financial health and performance prospects in a rapidly changing world. Having built an ESGT risk profile with the help of mathematical models, the IA of the object of study and the strategy of practical measures to increase it are determined. When modeling these processes, one should consider the growing uncertainty of the modern world due to the emergence of new risks; a large number of systemic links between the structures of the modern technosphere; the power-law nature of the distribution of the probability density of catastrophe damage, which decreases more slowly than the Gaussian dependence. In addition, the efficiency of complex production systems is largely determined by the balance of their individual links. Therefore, to assess investment risks, new methods are required to formalize the dependence of IA on ESGT-factors for the integrated management of the level of credit, market, insurance and operational risks under conditions of uncertainty. The purpose of the article is to develop mathematical methods for quantifying IA and determining real costs to improve the management, social and technological structure of IO, and minimize environmental pollution. Results. A mathematical model has been developed for assessing the environmental, social, managerial and technogenic leaving risks of investment, which makes it possible to determine the optimal strategies for increasing the IA of a possible IO. For a comprehensive risk assessment, methods of the theory of singularities of smooth reflections (TOGO) and the method of analysis of hierarchies (MAH) are used. The following algorithm for estimating IA is proposed: 1) determining the indices of the ESGT-components of risk; 2) calculation of bifurcation index values; 3) determination of the weakest links, which are associated with a decrease in IA; 4) identification of priority measures to prevent the reduction of IA or restore it to a predetermined level and minimize the negative impacts of extreme events and ensure sustainable development. Conclusions. The obtained results show that mathematical models based on the use of TOGO and MAH methods are an important tool for estimating IA under conditions of uncertainty. They allow: 1) to calculate the degree of approximation of the parameters characterizing the functioning of the object to their critical values ??when the IA changes; 2) to determine effective controls to minimize the risk of losing IA or minimize the time and losses for returning IA; 3) to consider the uncertainty factor associated with the features of the decision-making process. The development of this work is aimed at creating an information system for assessing IA for the integrated management of the level of credit, market, insurance and operational risks in the face of uncertainty and determining effective scenarios for minimizing investment risks. Keywords: mathematical modeling, system analysis, investment risks.

show abstract

Study of the impact of the technical state of the transformers with the LTC on the parameters of the EES modes optimal control

Cited by 2 publications

References 1 publication

Research processes of oil and paper insulation of high-voltage equipment during operation

Research processes of oil and paper insulation of high-voltage equipment during operation

Assessment of Environmental, Social, Governance and Technogenic Components of Investment Risks

Contact Info

Product

Resources

About