Particle-in-cell simulation on effect of outgassing on flashover and breakdown on dielectric surface in high-power microwave environment

Dong, Ye; Qian-Hong, Zhou; Yang, Wenyuan; Zhou, Haijing

doi:10.7498/aps.63.027901

Cited by 18 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The vibration and movement of electrons are enhanced with higher operating temperature. Then, more electrons are generated by collision ionization with the molecules or neutral atoms, which result in increased conductivity and breakdown path inside the dielectrics. − Besides, greater environmental humidity during the test can reduce the dielectric breakdown strength. Last but not the least, tested conditions also influence the breakdown phenomenon. − Generally, the breakdown strength obtained by immersing the tested sample in silicone oil is higher than that obtained in air, which is due to the avoidance of creeping discharge. − However, the precise understanding of the breakdown process of dielectrics is still not completely clear due to the numerous influencing factors and complicated mechanisms of breakdown.…”

Section: Basic Theories On Dielectric Capacitors For Energy Storagementioning

confidence: 99%

Recent Progress and Future Prospects on All-Organic Polymer Dielectrics for Energy Storage Capacitors

et al. 2021

View full text Add to dashboard Cite

With the development of advanced electronic devices and electric power systems, polymer-based dielectric film capacitors with high energy storage capability have become particularly important. Compared with polymer nanocomposites with widespread attention, all-organic polymers are fundamental and have been proven to be more effective choices in the process of scalable, continuous, and large-scale industrial production, leading to many dielectric and energy storage applications. In the past decade, efforts have intensified in this field with great progress in newly discovered dielectric polymers, fundamental production technologies, and extension toward emerging computational strategies. This review summarizes the recent progress in the field of energy storage based on conventional as well as heat-resistant all-organic polymer materials with the focus on strategies to enhance the dielectric properties and energy storage performances. The key parameters of all-organic polymers, such as dielectric constant, dielectric loss, breakdown strength, energy density, and charge–discharge efficiency, have been thoroughly studied. In addition, the applications of computer-aided calculation including density functional theory, machine learning, and materials genome in rational design and performance prediction of polymer dielectrics are reviewed in detail. Based on a comprehensive understanding of recent developments, guidelines and prospects for the future development of all-organic polymer materials with dielectric and energy storage applications are proposed.

show abstract

Section: Basic Theories On Dielectric Capacitors For Energy Storagementioning

confidence: 99%

Recent Progress and Future Prospects on All-Organic Polymer Dielectrics for Energy Storage Capacitors

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Compared to experimental research, more theoretical studies were devoted to exploring the effect of desorbed gas on microwave window breakdown in vacuum [12,[15][16][17][18][19]. Wang used the electrostatic particle-in-cell-Monte Carlo collision (PIC-MCC) model to numerically simulate the window breakdown involving desorbed gas [15].…”

Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

“…The effect of desorbed gas yield on the evolution of electron number density and mean electron energy was analyzed. Cheng investigated numerically the suppression of window breakdown by an external magnetic field when considering the influence of desorbed gas [16]. Under different yields and speeds of desorbed gas molecular, the electrostatic PIC-MCC model was employed by Dong to simulate the changes in the number and mean energy of electrons over time [17][18][19].…”

Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window

ZHAO 赵,

LIU 刘,

WANG 王

et al. 2024

Plasma Sci. Technol.

View full text Add to dashboard Cite

The gas desorbed from the dielectric surface has a great influence on the characteristics of microwave breakdown on the vacuum side of the dielectric window. In this paper, the dielectric surface breakdown is described by using the electromagnetic particle-in-cell-Monte Carlo collision (PIC-MCC) model. The process of desorption of gas and its influence on the breakdown characteristics are studied. The simulation results show that, due to the accumulation of desorbed gas, the pressure near the dielectric surface increases in time, and the breakdown mechanism transitions from secondary electron multipactor to collision ionization. More and more electrons generated by collision ionization drift to the dielectric surface, so that the amplitude of self-organized normal electric field increases in time and sometimes points to the dielectric surface. Nevertheless, the number of secondary electrons emitted in each microwave cycle is approximately equal to the number of primary electrons. In the early and middle stages of breakdown, the attenuation of the microwave electric field near the dielectric surface is very small. However, the collision ionization causes a sharp increase in the number density of electrons, and the microwave electric field decays rapidly in the later stage of breakdown. Compared with the electromagnetic PIC-MCC simulation results, the mean energy and number of electrons obtained by the electrostatic PIC-MCC model are overestimated in the later stage of breakdown because it does not take into account the attenuation of microwave electric field. The pressure of the desorbed gas predicted by the electromagnetic PIC-MCC model is close to the measured value, when the number of gas atoms desorbed by an incident electron is taken as 0.4.

show abstract

“…The other carbon radicals recouple with low binding energy to form an amorphous C-C structure on the surface of insulation (figure 10(e)), resulting in an increase in sp 3 C of the EP molecules and severe carbonization of the insulation. The generated low molecular gases may increase the content of absorbed gases on the EP surface [19] and promote the outgassing process of the insulation in flashover, thereby affecting its flashover voltage [20]. Also, the amorphous carbon chains formed on the surface of insulation have higher electroconductivity than that of the matrix of EP.…”

Section: Destruction Of Ep Surface Molecule Structure After Suffering...mentioning

confidence: 99%

Effects of arc ablation on surface electrical performance of epoxy resin insulation

Sima¹,

Yin²,

Sun³

et al. 2018

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Operation of a high-voltage, direct current circuit breakers can cause irreversible damage to the surface electrical performance of insulation due to arc ablation. To analyze the failure mechanism, the epoxy resin (EP) insulation was ablated under experimental arcs of different energy values. The rated current of the experimental arc is 5 A, and the ablation energy values were set as 0 J, 31.3 J, 78.2 J, 109.6 J and 156.5 J respectively by changing the arc duration. The destruction of the EP surface molecule structure was investigated by using x-ray photoelectron spectroscopy and gas chromatography. Furthermore, the surface potential decay and distribution characteristics of surface traps were studied by using the isothermal surface potential decay (ISPD) method. The test results indicate that when arc energy reaches 156.5 J, the DC flashover voltage of EP decreases by 64.7% and the surface conductivity increases by 3.22 times, compared with that of the virgin sample. Reductive groups in EP molecules are oxidized when suffering arc ablation, thereby leading to the breakage of molecular chains and severe carbonization, forming amorphous carbides with high conductivity on EP surface. ISPD results show that the density of deep traps and the center energy level of traps on the EP surface increase when the arc energy increases. These traps can form multiple charge centers and distort the electric field distribution on the EP surface. Thus, the partial discharge is promoted and flashover finally occurs, thereby decreasing the surface electrical strength of EP.

show abstract

Particle-in-cell simulation on effect of outgassing on flashover and breakdown on dielectric surface in high-power microwave environment

Cited by 18 publications

References 15 publications

Recent Progress and Future Prospects on All-Organic Polymer Dielectrics for Energy Storage Capacitors

Recent Progress and Future Prospects on All-Organic Polymer Dielectrics for Energy Storage Capacitors

Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window

Effects of arc ablation on surface electrical performance of epoxy resin insulation

Contact Info

Product

Resources

About