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学者姓名：何桐桐
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Abstract ：
The improvement of the transmission capacity of the line of EHV submarine cable has become urgent issues that need to be addressed. The transmission capacity of the EHV submarine cable is mainly determined by the operating temperature of the submarine cable. Therefore, several cooling schemes are compared to analyze their cooling effect on the cable core temperature in this paper. For the water pipe cooling scheme, the cooling effect is the most significant when the velocity of the cooling water is slower than 0.1 m/s, increasing the number of cooling water pipes can effectively reduce the cable core temperature. For the wind cooling scheme, the cooling effect is the most significant when the velocity of the air is slower than 0.1 m/s, and the cooling effect is more significant with the air velocity. For the backfill soil cooling scheme, the cooling effect is more significant with the thermal conductivity of the backfill soil. © Beijing Paike Culture Commu. Co., Ltd 2024.
Keyword ：
Air Air Cooling Cooling Cooling water Cooling water EHV power transmission EHV power transmission Submarines Submarines Thermal conductivity Thermal conductivity Water pipelines Water pipelines
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| GB/T 7714 | Zhang, Hao , Ma, Guoqing , Li, Pengfei et al. Transmission Ampacity Improvement of EHV Submarine Cable [C] . 2024 : 387-395 . |
| MLA | Zhang, Hao et al. "Transmission Ampacity Improvement of EHV Submarine Cable" . (2024) : 387-395 . |
| APA | Zhang, Hao , Ma, Guoqing , Li, Pengfei , Huang, Youcong , He, Tongtong , Zheng, Yuesheng . Transmission Ampacity Improvement of EHV Submarine Cable . (2024) : 387-395 . |
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Mixing helium and argon as the working gas of cold plasma jet is expected to combine the advantages of helium plasma jet and argon plasma jet. Surface distributions of ROS on model tissue treated by a He+Ar+O2 plasma jet were investigated in this study. The results show that the effective treatment area of He+Ar+O2 plasma jet on model tissue increases with the argon volume fraction in the working gas. When the argon volume fraction was 60%, the effective treatment area of the He+Ar+O2 plasma jet is 9 times greater than that of the He+O2 plasma jet, and the surface distribution uniformity of ROS on model tissue is even greater than that of Ar+O2 plasma jet. Furthermore, mixing helium and argon as the working gas of the plasma jet diminishes the effect caused by variations in the treatment angle of the plasma jet, maintaining the effective treatment area of the plasma jet directly below the jet nozzle. These results suggest that He+Ar+O2 plasma jet is advantageous for precisely controlling the dosage of ROS in clinical applications. © 2024 IEEE.
Keyword ：
cold plasma jet cold plasma jet model tissue model tissue reactive oxygen species reactive oxygen species surface distribution surface distribution
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| GB/T 7714 | Wang, Y. , Song, L. , He, T. et al. Surface Distributions of ROS on Model Tissue Treated by a He+Ar+O2 Plasma Jet [未知]. |
| MLA | Wang, Y. et al. "Surface Distributions of ROS on Model Tissue Treated by a He+Ar+O2 Plasma Jet" [未知]. |
| APA | Wang, Y. , Song, L. , He, T. , Zheng, Y. . Surface Distributions of ROS on Model Tissue Treated by a He+Ar+O2 Plasma Jet [未知]. |
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Mixing helium and argon as the working gas of cold plasma jet is expected to combine the merits of He plasma jet and Ar plasma jet and has great potential for medical applications. For this reason, the discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet were studied in this paper. The result shows that the Penning effect between He and Ar is strongest when the volume fraction of Ar in the working gas is 10%, and the plasma jet propagates the longest distance. A low drive voltage and a wide pulse width will weaken the Penning effect between He and Ar, resulting in a decrease in the ionization efficiency of the plasma jet. Gelatin gel was used as the model human tissue, and the effective treatment area of He + Ar + O2 plasma jet on the model tissue increases with the volume fraction of Ar in the working gas. When the volume fraction of Ar is 50%, the effective treatment area of He + Ar + O2 plasma jet is 9 times that of He + O2 plasma jet, and the surface distribution of reactive oxygen species on the model tissue is almost uniform. Moreover, with the increase of volume fraction of Ar, the influence of the change of the plasma jet treatment angle on the surface distribution of reactive oxygen species is significantly weakened, indicating that He + Ar + O2 plasma jet can precisely control the reactive species dosage on the living tissue for clinical application. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
Keyword ：
Air Air Atmospheric pressure Atmospheric pressure Diagnosis Diagnosis Electric discharges Electric discharges Ionization of gases Ionization of gases Medical applications Medical applications Oxygen Oxygen Plasma jets Plasma jets Tissue Tissue Volume fraction Volume fraction
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| GB/T 7714 | He, Tongtong , Wang, Yunzheng , Chen, Zeyu et al. Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure [J]. | European Physical Journal D , 2024 , 78 (6) . |
| MLA | He, Tongtong et al. "Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure" . | European Physical Journal D 78 . 6 (2024) . |
| APA | He, Tongtong , Wang, Yunzheng , Chen, Zeyu , Zheng, Yuesheng . Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure . | European Physical Journal D , 2024 , 78 (6) . |
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In order to clarify the positive ion mobility in nitrogen (N2) containing tiny amounts of oxygen (O2), experimental measurements were carried out for further analysis. A closed testing box including coaxial cylindrical electrodes with different parameters was built up. Under the same temperature and humidity conditions inside the box, DC positive corona was applied to produce the positive ions. The voltage and current values were recorded with different O2 concentration in high purity N2, then the analytical calculation of positive ion mobility was carried out based on the classic fluid model. The mobilities under different O2 concentration were compared and analyzed. It is found that all the mobilities of positive ions with different electrodes in N2 decreases when the O2 concentration decreases from about 2.1% to 0.9%. The results show that the mobility of positive ions in N2 is increased with the O2 concentration increased, so the presence of dilute O2 will accelerate the movement rate of positive ions in N2. The results can provide a reference for analyzing the ion migration process in N2 containing dilute O2, as found in corona and streamer discharges. © 2023 IEEE.
Keyword ：
coaxial electrode coaxial electrode corona discharge corona discharge ion mobility ion mobility nitrogen nitrogen oxygen oxygen
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| GB/T 7714 | Yu, B. , Wu, Y. , He, T. et al. Effect of Dilute Oxygen on Mobility of Positive Ions in Nitrogen [未知]. |
| MLA | Yu, B. et al. "Effect of Dilute Oxygen on Mobility of Positive Ions in Nitrogen" [未知]. |
| APA | Yu, B. , Wu, Y. , He, T. , Zheng, Y. . Effect of Dilute Oxygen on Mobility of Positive Ions in Nitrogen [未知]. |
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An off-line testing platform for the breakdown in insulating layer of 10 kV overhead insulated conductor is built up. The effect of voltage rising mode, insulating material, breakdown distance and other factors on the breakdown characteristics is analyzed. The influence mechanism of various factors on the breakdown characteristics in insulating layer is explained by Weibull distribution and Schottky thermal emission model. The off-line evaluation method for the breakdown of insulating layer can effectively identify the breakdown characteristics of different insulating materials and avoid safety risks. © 2023 IEEE.
Keyword ：
insulation breakdown insulation breakdown overhead insulated conductor overhead insulated conductor Schottky thermal emission Schottky thermal emission Weibull distribution Weibull distribution
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| GB/T 7714 | Wu, Y. , Yu, B. , He, T. et al. Breakdown in Insulation Layer of 10 kV Overhead Insulated Conductor [未知]. |
| MLA | Wu, Y. et al. "Breakdown in Insulation Layer of 10 kV Overhead Insulated Conductor" [未知]. |
| APA | Wu, Y. , Yu, B. , He, T. , Zheng, Y. . Breakdown in Insulation Layer of 10 kV Overhead Insulated Conductor [未知]. |
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When submarine cable line fails or other lines need load transfer, it often suffers from emergency ampacity that exceeds the steady-state ampacity. The layout environment of the submarine cable is always complex and changeable, and the overload capacity of the submarine cable in different layout environments is also different. Therefore, it is necessary to analyze the overload capacity of the submarine cable. In this paper, a coupled multi-physical field model by finite element method is established for AC 500 kV XLPE extra high voltage submarine cable in landing section, which is the ampacity bottleneck section of the whole line. The overload capacity of submarine cable in two typical layout environments which are direct buried and within pipeline is analyzed. The results show that the overload capacity of submarine cable in the direct buried environment is much higher than that in the pipeline environment. The allowable emergency time in the direct buried environment is 2-3 times that of the pipeline environment under the same condition. In the two typical layout environments, when the emergency current are 2500 A and 3500 A, the ratio of the emergency time allowed to run in the direct buried environment to that in the pipeline environment is about 5 times under the same initial capacity. The proposed model can provide a reference for dynamic capacity control of the extra high voltage submarine cable.
Keyword ：
finite element method finite element method landing section landing section layout environment layout environment overload capacity analysis overload capacity analysis steady-state ampacity steady-state ampacity submarine cable submarine cable
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| GB/T 7714 | Zhang, Hao , Ma, Guoqing , Li, Pengfei et al. Overload capacity analysis of extra high voltage AC XLPE submarine cable [J]. | FRONTIERS IN ENERGY RESEARCH , 2023 , 11 . |
| MLA | Zhang, Hao et al. "Overload capacity analysis of extra high voltage AC XLPE submarine cable" . | FRONTIERS IN ENERGY RESEARCH 11 (2023) . |
| APA | Zhang, Hao , Ma, Guoqing , Li, Pengfei , Huang, Youcong , He, Tongtong , Zheng, Yuesheng . Overload capacity analysis of extra high voltage AC XLPE submarine cable . | FRONTIERS IN ENERGY RESEARCH , 2023 , 11 . |
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该文设计了一套大气压冷等离子体射流处理人体组织模型的多学科交叉实验教学研究方案。该方案将等离子体射流在人体组织模型表面的处理范围可视化，极大地强化了学生对等离子体作用机理的认知，激发了学习兴趣。实验采用明胶水凝胶模拟人体组织，并在其中添加活性粒子显色剂，通过观测等离子体射流处理之后明胶水凝胶表面的显色分布情况，表征等离子体射流在人体组织模型表面的处理范围。该教学方案有助于学生了解学科前沿知识，提升学科交叉意识及科研能力，操作简单、成本低廉，适合国内大部分院校开展。
Keyword ：
人体组织模型 人体组织模型 实验教学 实验教学 等离子体射流 等离子体射流 表面处理范围 表面处理范围
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| GB/T 7714 | 何桐桐 , 何燕鹏 , 郑跃胜 . 大气压冷等离子体射流处理人体组织模型的实验教学研究 [J]. | 实验技术与管理 , 2022 , 39 (06) : 144-147 . |
| MLA | 何桐桐 et al. "大气压冷等离子体射流处理人体组织模型的实验教学研究" . | 实验技术与管理 39 . 06 (2022) : 144-147 . |
| APA | 何桐桐 , 何燕鹏 , 郑跃胜 . 大气压冷等离子体射流处理人体组织模型的实验教学研究 . | 实验技术与管理 , 2022 , 39 (06) , 144-147 . |
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A polymer barrier inserted in the interelectrode gap can significantly improve the insulation performance of air-insulated high-voltage electrical equipment. With the development of power equipment towards integration and miniaturisation, multiple barriers can be used to further increase the insulation level. This paper investigated the withstand characteristics of the air-insulated rod-rod gap with multiple barriers by changing the barrier numbers, the barrier position and the barrier insertion direction. Four control modes were set up based on the assumed breakdown paths under alternating voltages. It was found that the control modes with barriers inserted from the opposite direction had a more significant improvement effect than that from the same direction. When the horizontal barrier position was closer to the electrode and the vertical barrier position was farther to the electrode axis, the breakdown voltage was higher. The vertical barrier position was a key factor affecting the probability of breakdown path type, and the breakdown voltages along different types of breakdown paths were almost the same when the barriers were at the same position. The increase of the breakdown voltage was mainly resulted from the change of electric field distribution in the insulated gap and the extension of the breakdown path length.
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| GB/T 7714 | Zheng, Yuesheng , Zhang, Peibin , Wang, Yilong et al. Breakdown path control by barrier effect for improving withstand characteristics of air-insulated gaps under alternating voltages [J]. | HIGH VOLTAGE , 2022 , 7 (4) : 753-762 . |
| MLA | Zheng, Yuesheng et al. "Breakdown path control by barrier effect for improving withstand characteristics of air-insulated gaps under alternating voltages" . | HIGH VOLTAGE 7 . 4 (2022) : 753-762 . |
| APA | Zheng, Yuesheng , Zhang, Peibin , Wang, Yilong , He, Tongtong . Breakdown path control by barrier effect for improving withstand characteristics of air-insulated gaps under alternating voltages . | HIGH VOLTAGE , 2022 , 7 (4) , 753-762 . |
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PM2.5 and other fine particles are one of the indoor air pollutants that pose a great threat to human health. Long-term exposure to dust will cause heart and lung diseases and even cancer. A large number of high-energy electrons and active particles in low-temperature plasma can directly act on harmful substances in the air, which has high potential in purifying PM2.5. In order to achieve high purification efficiency of PM2.5, multi-needle electrode was used to generate large area plasma through negative DC corona discharge, and the purification characteristics of PM2.5 were investigated. It is found that increasing the number of electrode needles can improve the purification efficiency of PM2.5 under different applied voltages, but saturation effect may exist. The electrode humidity will affect the efficiency of PM2.5, and the efficiency in wet state is slightly higher than that in dry state. © 2022 IEEE.
Keyword ：
Air cleaners Air cleaners Electric corona Electric corona Electrodes Electrodes Health risks Health risks Indoor air pollution Indoor air pollution Needles Needles Temperature Temperature
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| GB/T 7714 | Huang, Huifen , Zheng, Yuesheng , He, Tongtong . Suspended Particle Purification by Negative Corona Discharges of Multi-needle Electrode [C] . 2022 : 2974-2977 . |
| MLA | Huang, Huifen et al. "Suspended Particle Purification by Negative Corona Discharges of Multi-needle Electrode" . (2022) : 2974-2977 . |
| APA | Huang, Huifen , Zheng, Yuesheng , He, Tongtong . Suspended Particle Purification by Negative Corona Discharges of Multi-needle Electrode . (2022) : 2974-2977 . |
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In this article, the effect of residual charges on the lightning impulse voltage testing in the air insulation gap and the hybrid gas-solid insulation gap within the range of 30-50 cm gap distances was studied using the modified up-and-down test (UDT) method. The impulse voltage testing was performed by changing the gap distance, the resting time, and the initial voltage. Experimental results show that the residual charges cause continuous breakdown and withstand during the testing when the gap distance is 30 cm, which cannot be considered by the standard UDT. When the residual charges are removed after the gap breakdown, the continuous breakdown and withstand phenomenon is disappeared, and the 50% impulse breakdown voltage U-50 is decreased under different gap distances, resting times, and initial voltages. The effect of the residual charges is strengthened with the decrease in the gap distance. When the breakdown path length is close to 30 cm in the air insulation gap and the hybrid gas-solid insulation gap, the effect of residual charges is significant. The modified UDT method is recommended when residual charges are present during impulse testing, which can be indicated by the number of tests.
Keyword ：
Barrier effect Barrier effect breakdown voltage breakdown voltage impulse testing impulse testing insulation gap insulation gap residual charge residual charge
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| GB/T 7714 | Zheng, Yuesheng , Chen, Shaokang , Kang, Zheng et al. Effect of Residual Charges on Lightning Impulse Voltage Testing in Insulation Gaps [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (1) : 334-342 . |
| MLA | Zheng, Yuesheng et al. "Effect of Residual Charges on Lightning Impulse Voltage Testing in Insulation Gaps" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 29 . 1 (2022) : 334-342 . |
| APA | Zheng, Yuesheng , Chen, Shaokang , Kang, Zheng , Wang, Yiqi , He, Tongtong . Effect of Residual Charges on Lightning Impulse Voltage Testing in Insulation Gaps . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (1) , 334-342 . |
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