Probabilistic evaluation of distribution power transformers reliability indices considering load transfers and mobile unit substations

Costa, João Guilherme de C.; Silva, Armando M. Leite da; Hamoud, G.; Pureza, Izabela M.; Neto, N.S.A.

doi:10.1016/j.epsr.2020.106501

Cited by 18 publications

(9 citation statements)

References 12 publications

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“…The periodic mineral oil model is established, and the initial density is set to 0.3 g/cm 3 . All the simulation steps contain three parts, including model optimization, structure relaxation, and molecular dynamics.…”

Section: Molecular Dynamics Simulation Methodsmentioning

confidence: 99%

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Diffusion Mechanisms of Dissolved Gases in Transformer Oil Influenced with Moisture Based on Molecular Dynamics Simulation

Jiang

Yang

et al. 2022

ACS Omega

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Dissolved Gas Analysis (DGA) of insulating oil is widely used for diagnosing transformer incipient faults. Moisture is a major contaminant and degradation byproduct of transformer insulating oil. In this paper, molecular dynamics simulation was used to study the influence of moisture on the diffusion movement of dissolved gases in the insulating oil. Cycloalkanes (C20H42), alkanes (C20H38), and aromatic hydrocarbons (C20H26) are selected as the basic structural units in the constructed transformer oil simulation system. 0%, 1%, 3%, and 5% moisture molecules are added to insulating oil, respectively, and the insulating oil generates seven kinds of gas molecules through cracking. With an anhydrous model used as a benchmark, we researched the diffusion trajectory, the diffusion coefficient (D), free volume (V F), and the moisture–gas interaction energy of each gas molecule as a function of moisture content. Through this study, we found that the increase of moisture content enlarges the V F value of dissolved gas in insulating oil, which makes the gas in oil easier to diffuse. Besides, the moisture can also alter the mean square displacement (MSD) of dissolved gases; the mutual energy of molecules is mainly affected by the electrostatic interaction energy. This study can contribute to a better understanding of the influence of different moisture contents on the diffusion movement of dissolved gas in transformer oil from the micro level.

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Section: Molecular Dynamics Simulation Methodsmentioning

confidence: 99%

“…This paper takes the mixture system containing 10 H 2 O molecules as an example to construct a transformer oil model without moisture, 1%, 3%, and 5% moisture, respectively. The oil density was set to 0.9 g/cm 3 , and the side length of the box was 25.1 Å. The simulation model is shown in Figure 3.…”

Section: Construction Of Transformer Oil Modelmentioning

confidence: 99%

Diffusion Mechanisms of Dissolved Gases in Transformer Oil Influenced with Moisture Based on Molecular Dynamics Simulation

Jiang

Yang

et al. 2022

ACS Omega

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“…According to the actual operation experience and relevant national standards, the five indicators such as load rate, voltage deviation, three-phase unbalance, power grid harmonics and frequency deviation are divided into five different grades from high quality to unqualified [3]. The specific classification is shown in Table 1 and Figure 1.…”

Section: Establishment Of Operational Status Index System Of Distribu...mentioning

confidence: 99%

Reliability Relation Extraction Technology of Power Distribution Equipment Based on Machine Learning

Dai

Shi

et al. 2022

J. Phys.: Conf. Ser.

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As the key link of power transmission in the power distribution system, the distribution transformer is the core of the entire power distribution system and is responsible for the electrical connection between the medium voltage side and the low voltage side, and based on this to further ensure the stable operation of the power distribution system. Data types, sources, selection principles and data processing methods relate to the operating state of distribution transformers; then expound the meaning of operating state indicators, and build a distribution transformer operating state index model; finally, an improved weight method is used to determine the distribution transformers of the weight coefficient of the running status indicator. Therefore, it is appropriate to verify the membership function and membership matrix selected in this paper. It is suitable for the fuzzy comprehensive evaluation calculation of the reliability of distribution transformers, which verifies the accuracy of the reliability evaluation results. The maintenance strategy of distribution transformers based on reliability assessment can be optimized according to the operation status of the equipment so as to improve the operation reliability of distribution transformers and ensure the safe, reliable and economical operation of the equipment. The maintenance strategy of distribution transformers based on reliability assessment can be optimized according to the operation status of the equipment, which is to improve the operation reliability of distribution transformers and ensure the safe, reliable and economical operation of the equipment.

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“…Chronological Monte Carlo Simulation (MCS) is a probabilistic method and realistic system representation than other which is used for evaluating RI. This method is used to find the maximum number of mobile unit substations (MUS), optimal acquisition time within DG and spares to stock for a similar power transformer [32].…”

Section: Related Workmentioning

confidence: 99%

Reliability Analysis Techniques in Distribution System: A Comprehensive Review

Kafle¹,

Bhandari²,

Rana³

2022

IJEM

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Quality of electricity with continuity is the reliability of the power system which is inversely proportional with the duration of power supply interruption. It depends on some expected or unexpected faults/failures on the systems, speed of protecting systems, preventive maintenance, and motivation of technical staffs. The detailed study of the distribution system is more crucial as its reliability is the concern of utility's fame, service, customers' satisfactions and reflects to the overall revenue. The relevant articles from the various sources has been collected and analyzed different reliability indices with their significance. Also, to realize the methodology related with reliability analysis, a comparative study among its different components has been carried out and the best techniques for maintaining system reliability are suggested.

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Probabilistic evaluation of distribution power transformers reliability indices considering load transfers and mobile unit substations

Cited by 18 publications

References 12 publications

Diffusion Mechanisms of Dissolved Gases in Transformer Oil Influenced with Moisture Based on Molecular Dynamics Simulation

Diffusion Mechanisms of Dissolved Gases in Transformer Oil Influenced with Moisture Based on Molecular Dynamics Simulation

Reliability Relation Extraction Technology of Power Distribution Equipment Based on Machine Learning

Reliability Analysis Techniques in Distribution System: A Comprehensive Review

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