Single bubble of an electronegative gas in transformer oil in the presence of an electric field

Gadzhiev, M. Kh.; Tyuftyaev, A. S.; Il’ichev, M. V.

doi:10.1134/s1063784217100103

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…According to Hastert's thermogenetic theory, if the temperature and molecular activation energy of insulating oil remains unchanged, the products will eventually be hydrocarbon gas and free carbon particles regardless of the process experienced during oil cracking. At present, gas chromatography is mainly used to study the gas production characteristics of insulating oil under high energy discharge conditions [16] .…”

Section: Gas Generation Mechanism Of Oil-paper Insulation Systemmentioning

confidence: 99%

Gas Production Characteristics of UHV Oil immersed Shunt Reactor with Vibration Defects

Gu,

Zhu,

Zhu

et al. 2023

J. Phys.: Conf. Ser.

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The special multi-air gap structure of Ultra high voltage (UHV) oil-immersed shunt reactor determines that its magnetic leakage is far greater than that of a power transformer of the same voltage level, and it is more prone to vibration and other problems. Overheating and suspended discharge caused by vibration are important sources of excessive gas production in UHV shunt reactors. In this paper, the source of gas production under reactor vibration is analyzed, and a reactor defect simulation gas production platform is built. Using oil chromatography analysis, partial discharge detection, and other means, the gas production characteristics, discharge characteristics and insulation degradation characteristics of typical defects such as suspended discharge and partial overheating under vibration have been experimentally studied. Then, the correlation analysis model between the vibration type, intensity, overheating degree, and the reactor performance change was established. Finally, the gas production and discharge characteristics of the reactor under different defect types were obtained. Besides, gas production characteristics under vibration with 50 Hz, 100 Hz, and 150 Hz were carried out, and it was found that the gas will continue to increase with the increase of vibration frequency, and the growth has been stabilized after exceeding 100 Hz. The relevant research results of this paper can provide technical support for the application of UHV oil-immersed shunt reactor state assessment and diagnosis, and improve the level of equipment operation and maintenance.

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Section: Gas Generation Mechanism Of Oil-paper Insulation Systemmentioning

confidence: 99%

Gas Production Characteristics of UHV Oil immersed Shunt Reactor with Vibration Defects

Gu,

Zhu,

Zhu

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…The larger the bubble size, the lower the corresponding initial discharge voltage and the more intense the PD. Gadzhiev [5] of the Joint Institute of High Temperature of the Russian Academy of Sciences compared the effect of air bubbles and SF6 bubbles on the insulation properties of transformer oil and found that air bubbles reduce the breakdown voltage of transformer oil more significantly, so the type of gas also affects the PD characteristics. The literature [6][7][8][9] made an indepth study on bubbles' kinetic characteristics and migration mechanism under extremely inhomogeneous electric fields.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Bubble Motion Characteristics in Oil Based on Level Set Method

Zeng,

Ren,

Bao

2023

HSET

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At present, transformer oil is the primary insulation method for large power transformers, and the dynamic behavior of bubbles in transformer oil can impact the insulation performance of transformer oil. Therefore, based on the level set method in this paper, the motion characteristics of bubbles in two structures, a horizontal oil channel and a vertical oil channel, under various conditions of different bubble numbers, different flow velocities, and different bubble sizes are studied using finite element simulation. The simulation results show that the kinetic behavior of bubbles becomes more complicated as the radius increases, the number of bubbles increases, and the flow velocity increases. At the same time, the bubble expansion and deformation is a cyclic process due to the electric field force, laminar flow and surface tension in the bubble suspension process.

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Enhancement of Electrical Distribution Networks Performance Using the Load Management Methodology

2020

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Single bubble of an electronegative gas in transformer oil in the presence of an electric field

Cited by 7 publications

References 10 publications

Gas Production Characteristics of UHV Oil immersed Shunt Reactor with Vibration Defects

Gas Production Characteristics of UHV Oil immersed Shunt Reactor with Vibration Defects

Analysis of Bubble Motion Characteristics in Oil Based on Level Set Method

Enhancement of Electrical Distribution Networks Performance Using the Load Management Methodology

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