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- 저자 : Dongxin He (검색결과 3 건)
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Dongxin He,Wenjie Gong,Tao Zhang,Wei Wang,Xiaoran Wang,Qingquan Li 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
Due to the complicated structure composed of diff erent kinds of materials, space charges tend to accumulate within cable accessories, which easily leads to the electrical breakdown. To obtain insights into the space charge accumulation in cable accessories, accelerated aging was performed for 10 kV crosslinked polyethylene (XLPE) insulated cable samples with stress cones, under an AC voltage of 26.1 kV and temperatures of 103 °C and 114 °C. The space charge distribution in the cable insulation was tested at diff erent aging stages. The results show that space charge accumulates in the insulation covered by the stress cones, and the charge density and coaxial distribution region increase during aging. Together with the results for the charge measurement on peeled cable samples, it is concluded that charge accumulation is related to the semiconductor used in the stress cones. It is diffi cult for the space charge generated in the cable insulation to escape through the silicone rubber-based (SR-based) semiconductor in the stress cones, as the ability of this material to conduct charges is lower than that of a cable-shielding ethylene–vinyl acetate-based (EVA-based) semiconductor; therefore, the space charge accumulates near the outer part of the insulation. This research provides insights into the important function of semiconductor on charge accumulation in cable accessories, which will aid in research on optimizing and prolonging the lifetime of cable accessories.
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He Dongxin,Zang Qingjing,Li Junda,Liu Hongshun,Xu Zhe,Li Qingquan 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
The thermal stress at the interface of different materials becomes distorted during the thermal expansion of a cable terminal, leading to cracking and insulation failure. To give a warning of the ultimate thermal stress of cable terminal, this paper presents a warning method for the ultimate thermal stress of the cable terminal based on tailpipe temperature monitoring. Taking a 110 kV gas-insulated switchgear cable terminal as an example, the heat transfer model of the cable terminal is established under the working condition of a through-flow. The relationship between the temperature of the tailpipe, maximum thermal stress of the epoxy casing, and current-carrying capacity of the cable is established based on a data fitting method, the ultimate stress of the epoxy is taken as a threshold value for the detection and calculate the corresponding current-carrying capacity of the cable and temperature of the tailpipe. The results show that the thermal stress concentration in the cable terminal exceeds the limit when the monitoring temperature at the exposed tailpipe reaches 54.25 °C. If the relationship between the external temperature of the cable terminal and maximum thermal stress is known, warning of the ultimate thermal stress of cable terminal by monitoring the temperature of the tailpipe, providing theoretical support for the regulation of the current-carrying capacity of the cable.
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Yang, Guiqin,Zhao, Fei,Tian, He,Li, Jiantao,Guo, Dongxin Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.4
Objective: Substituting starch with digestible fiber (dF) can improve digestive health of rabbits and reduce costs. Therefore, it is necessary to develop a criterion for dF and starch supply. Effects of the dietary dF-to-starch ratio on pellet quality, growth and cecal microbiota of Angora rabbits were evaluated. Methods: Five isoenergetic and isoproteic diets with increasing dF/starch ratios (0.59, 0.66, 0.71, 1.05, and 1.44) were formulated. A total of 120 Angora rabbits with an average live weight of 2.19 kg were randomly divided into five groups with four replicates. At the end of 40 day feeding trial, cecal digesta were collected to analyse microbiota. Results: The results showed that the dF/starch ratio had linear effects on pellet variables (p<0.01). When the dF/starch ratio was 1.44, the pellets had the lowest powder and highest durability. The dF/starch ratio had unfavorable linear effects on growth variables (p<0.001). When analyzed by quadratic regression, the optimal dF/starch ratios for average weight gain and feed/gain were 0.59 and 0.74, respectively. There were differences in wool yield, fiber length and fiber diameter caused by the dF/starch ratio (p<0.05), and the dF/starch ratios that ranged from 0.66 to 1.06 were appropriate for good results. The cecal microbiota operational taxonomic unit (OTU) number index in the 1.05 dF/starch treatment was higher than that in the 0.66 and 0.71 dF/starch treatments. The higher dF/starch ratio resulted in a higher cecal microbiota OTU number index (p<0.05). The proportion of Ruminococcus in the 0.71 dF/starch treatment was higher than that in the 0.59 dF/starch treatment (p<0.05) Conclusion: The most suitable dF/starch ratio for feed pellet quality is 1.44, and for rabbit growth the optimal range of ratios is from 0.59 to 0.74. With combination of the wool growth, output cost, and cecal microbiota, we suggest that a dietary dF/starch ratio ranging from 0.74 to 1.06 is optimal.
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