Influence of temperature on developing process of surface flashover in oil-paper insulation under combined AC-DC voltage

Zhou, Yuanxiang; Fu, Jin; Huang, Meng; Sha, Ye; Zhang, Ling; Huang, Jianwen

doi:10.1109/ceidp.2013.6748251

Cited by 10 publications

(13 citation statements)

References 8 publications

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“…In a nonuniform electric field, assuming that the fluid (i.e., transformer oil and the gas in the bubbles) is incompressible, the force on the bubbles consists mainly of electrodynamic, drag, and buoyancy forces; the latter two being due to the liquid viscosity and gravity, respectively. Therefore, the equation of motion for bubbles in the liquid is (4) where m is the bubble mass, v is the bubble velocity, t is time, FE is the electric-field force of bubbles; FD is the drag force on the bubble, FB is the buoyancy force on the bubble, and FG is…”

Section: A Numerical Model Of Bubble Migrationmentioning

confidence: 99%

See 1 more Smart Citation

The Generation and Migration of Bubbles in Oil-Pressboard Insulation Needle-Plate System

Liu

Xue

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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Bubbles in transformer oil can easily lead to partial discharge, which can deteriorate the transformer oil and even breakdown the transformer insulation. To clarify the migration process and the characteristics of bubbles generated in an oilimmersed power transformer exposed to an extremely uneven electric field, we experimentally monitor these phenomena under an extremely nonuniform AC electric field and numerically simulate the migration distance and the migration speed of bubbles with different initial positions and sizes. The results show that the streamer discharge channel formed by a partial discharge in oil is gasified into a bubble channel. After it collides with the surface of the pressboard, its morphology is transformed into approximately spherical bubbles due to the surface tension of the gas-liquid interface. After bubbles are generated in the oil, they move away from areas with a strong electric field due to the electric-field force and gradually approach the oil surface due to the buoyancy force. The experimental results are consistent with the simulation results, which verify the rationality of the simulation model.

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Section: A Numerical Model Of Bubble Migrationmentioning

confidence: 99%

“…S the core equipment of power system, the reliable operation of the power transformer is closely related to the safety and stability of the entire system [1][2][3][4]. Unfortunately, transformer-insulation failure has been an alltoo-common occurrence in recent years [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The Generation and Migration of Bubbles in Oil-Pressboard Insulation Needle-Plate System

Liu

Xue

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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“…According to the requirements of DL/T 810-2002, the surface of the sample was first washed with absolute ethanol, and then the surface of the sample is washed with deionized water. They were stored in a dust free container for 24 h, and finally they were placed in UV accelerated aging chamber for different times to prepare samples of different degrees of aging [23][24][25][26].…”

Section: Ultraviolet Accelerated Aging Devicementioning

confidence: 99%

“…The entire electrode was made of stainless steel, and the electrode configuration parameters were shown in the figure 1. In order to improve the stability of the electrode structure in the study, polytetrafluoroethylene was used to strengthen electrode configuration, thereby reducing the experimental error [23][24][25][26].…”

Section: Electrode Configurationmentioning

confidence: 99%

Effect of UV radiation aging on creepage discharge characteristics of high temperature vulcanized silicon rubber at high altitude

Zhou

Liang

2019

Plasma Sci. Technol.

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The physicochemical properties and creepage discharge characteristics of aged high temperature Vulcanized (HTV) silicone rubber materials were investigated by ultraviolet radiation (UV) aging method in this study. The experimental results show that as the aging time increases, the creepage discharge flashover voltage increases first and then decreases. But the aging time has little effect on the creepage discharge inception voltage. With the aging time prolonged, the discharge endurance time of HTV silicone rubber is shortened, and the creepage discharge development velocity is accelerated. In the short time of applying voltage to aging material, the magnitude of discharge increases rapidly. According to the partial discharge characteristic parameters of creepage discharge, the whole creepage discharge process is partitioned into four stages. Compared with unaged HTV silicone rubber, the aged HTV silicone rubber has less fluctuation in performance parameters and a clear trend. The study found that UV aging not only affects the physicochemical and hydrophobic properties of the HTV silicone rubber, but also accelerates the development of creepage discharge under AC voltage.

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“…Owing to the special operating conditions of the converter transformer, the oil-paper insulation suffers different electrical fields in the value side bushings [2]. Under electrical fields, charges caught by traps accumulate on the surface of oilpaper insulation, which can distort the electric field, lead to surface discharge and even cause the insulation failure of the system, especially at higher operation temperature [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Temperature‐dependent surface charge and discharge behaviour of converter transformer oil–paper insulation under DC voltage

Kong

Chang

Zhu

et al. 2019

IET Science, Measurement & Technology

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Influence of temperature on developing process of surface flashover in oil-paper insulation under combined AC-DC voltage

Cited by 10 publications

References 8 publications

The Generation and Migration of Bubbles in Oil-Pressboard Insulation Needle-Plate System

The Generation and Migration of Bubbles in Oil-Pressboard Insulation Needle-Plate System

Effect of UV radiation aging on creepage discharge characteristics of high temperature vulcanized silicon rubber at high altitude

Temperature‐dependent surface charge and discharge behaviour of converter transformer oil–paper insulation under DC voltage

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