Finite-Element Analysis for Surface Discharge Due to Interfacial Polarization at the Oil-Nanocomposite Interface

Choi, Ji Sun; Kim, Su-Hun; Jang, Kyunghoon; Hikita, Masayuki; Lee, Se-Hee

doi:10.1109/tmag.2017.2751066

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…The interface charges are divided into free surface charge from the space charge, and bound surface charge from the polarization charge, as shown in Fig. 12. J.-H. Choi et al [26] studied the distribution of the charge at interface oil-pressboard. They proposed that the dominant space charge density is due to the positive ions in the streamer head, while the negative bound surface charge is dominant around the streamer head region, and the positive free surface charge remains around the back of the streamer head, as Fig.…”

Section: ) Surface Flashover Difference Analysismentioning

confidence: 99%

“…Compared with the 3EMO-IP, there is more permittivity difference between MO and its impregnated pressboard, FIGURE 13. Process of creepage discharge at the oil-cellulose pressboard interface [26].…”

Section: ) Surface Flashover Difference Analysismentioning

confidence: 99%

“…FIGURE 12.Distribution of surface charges at the interface of oil-cellulose insulation pressboard when an external field was applied[26].…”

mentioning

confidence: 99%

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AC Surface Flashover and Gas Generation Difference of the Cellulose Insulation Pressboard Immersed in Novel 3-Element Mixed Oil and Mineral Oil

et al. 2019

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Surface flashover fault is one of the most challenge issues in oil-cellulose insulation pressboard system used in power transformer. In this study, a comparative study of the AC surface flashover properties of the novel 3-element mixed oil-cellulose insulation pressboard (3EMO-IP) and mineral oil-cellulose insulation pressboard (MO-IP) was performed under needle-plate and finger-finger electrode, respectively, measurement including dielectric property, surface flashover voltage, damage of cellulose pressboard surface and the gas generation behaviors after multiple surface flashover. Results show that the cellulose insulation pressboard immersed in the novel 3-element mixed insulation oil (3EMO) has higher relative permittivity and dielectric loss factor at 50 Hz, and also has slightly lower surface resistivity. The AC surface flashover voltage of the 3EMO-IP is higher than that of MO-IP under needle-plate and finger-finger electrode (electrode distance 5 mm, 10 mm, 15 mm and 20 mm). Compared to MO-IP, the lower electric field intensity at the oil-pressboard interface, as well as more difficult for surface charge accumulation of 3EMO-IP and the higher breakdown voltage of 3EMO lead to the higher AC surface flashover voltage of 3EMO-IP. Moreover, the carbonization of fibers in 3EMO-IP is slightly less. After multiple surface flashover, C 2 H 2 and total hydrocarbon gases are the main differences between 3EMO-IP and MO-IP, which is more marked with the increase of flashover times. This study offers a reference for improving the surface flashover property of oil-pressboard insulation system by using 3EMO.

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Section: ) Surface Flashover Difference Analysismentioning

confidence: 99%

Section: ) Surface Flashover Difference Analysismentioning

confidence: 99%

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AC Surface Flashover and Gas Generation Difference of the Cellulose Insulation Pressboard Immersed in Novel 3-Element Mixed Oil and Mineral Oil

et al. 2019

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“…The low-temperature plasmas can change the surface physical and chemical properties of insulating materials without influencing the bulk. The physical morphology inhibits the accumulation of surface charges, thereby improving the withstand voltage of insulating materials [19,20]. He et al used magnetron sputtering to coat a Cr 2 O 3 nano-film on the surface of the epoxy resin to suppress the homo-polar charge injected from the electrode effectively [21].…”

Section: Introductionmentioning

confidence: 99%

Nano-sized composite improving the insulating performance of insulating paper using low-temperature plasmas

Zhang

et al. 2021

Nanotechnology

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Nanostructured dielectric composite has been considered as a promising manner in improving the flashover performance of oil-paper which has been widely used in power systems. In this paper, plasma-enhanced chemical vapor deposition (PECVD) is used to deposit SiO2 on the ceramic fiber-reinforced insulating paper. Scanning electron microscope images show a large number of SiO2 nanoparticles with diameters of 100 nm–250 nm uniformly attached to the fiber surface after the plasma deposition. The surface flashover voltage of the insulating paper was tested in the air and the transformer oil, respectively. Results show that the corresponding DC surface flashover voltages increased by 15.1% in the air and breakdown between liquid and solid interface increased by 24.6% after the PECVD. It is believed that nanoparticles constructed in ceramic fibers change the electron injection barrier which inhibits the injection of negative charges and hinders the accumulation of charges in the dielectric. Nanoparticles can capture electric charges formed in the transformer oil which affects the generation and development of streamers, resulting in an increased dielectric strength. This study provides a new method to comprehensively improve the surface insulating property which has the prospect of promoting other dielectric materials.

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“…However, in the piecewise analysis of the creeping discharge process and characteristics, the PD pulse of the creeping discharge and the effect of the electric field vertical component are rarely investigated. Furthermore, the behavior of the surface streamer and the relationship between the discharge phenomenon and charge behavior on the PB surface are rarely studied [11].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Creeping Discharge Caused by a Needle Electrode in Oil-Pressboard Insulation under +DC Voltage

Liu

2021

IEEE Trans. Dielect. Electr. Insul.

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This paper presents an analysis of the creeping discharge characteristics caused by a needle electrode in oil-pressboard insulation under a positive DC voltage. The discharge behavior under a strongly (model I) or weakly (model II) vertical component of the electric field is studied using partial discharge (PD) detections, camera observations, and charge distribution simulations. It is found that the development process of the creeping discharge can be divided into three stages according to the stepwise growth trends of apparent charge amplitude and PD repetition rate. The timeresolved PD pattern and equivalent time-frequency pattern are different in the two models. Most discharge pulses are unimodal with underdamped oscillations, but bimodal pulses can occur in model II. The streamer in model I has a tail caused by the stranded charge. A secondary streamer can occur in model II following the initial streamer, causing a bimodal PD pulse. The study findings can provide suggestions for the optimization of insulation design and the promotion of converter transformer maintenance.

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Finite-Element Analysis for Surface Discharge Due to Interfacial Polarization at the Oil-Nanocomposite Interface

Cited by 9 publications

References 12 publications

AC Surface Flashover and Gas Generation Difference of the Cellulose Insulation Pressboard Immersed in Novel 3-Element Mixed Oil and Mineral Oil

AC Surface Flashover and Gas Generation Difference of the Cellulose Insulation Pressboard Immersed in Novel 3-Element Mixed Oil and Mineral Oil

Nano-sized composite improving the insulating performance of insulating paper using low-temperature plasmas

Characteristics of Creeping Discharge Caused by a Needle Electrode in Oil-Pressboard Insulation under +DC Voltage

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