2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)最新文献

{"title":"Overall Improvements in Outdoor Performance of ATH-free Silicone Rubbers by Direct Fluorination","authors":"Jingtao Xu, Yanming Qin, Z. An","doi":"10.1109/ICHVE53725.2022.9961556","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961556","url":null,"abstract":"This report summarizes previous studies on direct fluorination of ATH-free silicone rubbers (SRs) with different types or formulations to improve the outdoor application performance of SR, and gives overall improvements in the outdoor performance of ATH-free SRs by direct fluorination. The overall performance improvements contain the hydrophobicity, moisture barrier properties, dc flashover performance, corona or arc discharge resistance, and tracking and erosion resistance. Physicochemical characteristics of the fluorinated layers are also described, and the related mechanisms for these performance improvements are explained.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132892770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Thermal Aging on SiC/Epoxy Resin Micro-composites","authors":"Yongsen Han, Feng Yang","doi":"10.1109/ICHVE53725.2022.9961454","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961454","url":null,"abstract":"The effects of thermal aging on nonlinear conductivity and dielectric properties of functionally gradient materials are studied. The 30 wt% silicon carbide (SiC)/epoxy resin (EP) micro-composites are prepared. The composites are subjected to thermal aging for 1080 h at 180 °C. The nonlinear conductivity, dielectric properties, and DC breakdown strength of the composite are measured, respectively. The experimental results show that when the aging temperature is 180 °C, the current density of SiC/epoxy micro-composites decreases first and then increases with the increasing aging time at 5kV/mm. When the aging time reaches 720 h, the nonlinear coefficient of the composites increases obviously, but the switching electric field decrease distinctly. With the increasing aging time, the relative permittivity and loss tangent of composites increase gradually, and the DC breakdown strength decreases gradually. DRIFT analysis shows that the degradation of the composites is mainly caused by the fracture of ether bond and the formation of carbonyl group in epoxy matrix.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132163965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research Status of Ultra-High Voltage Large-Diameter Post Composite Insulators in China","authors":"Songsong Zhou, Tianfang. Zhao, Yunpeng Liu, Le Li","doi":"10.1109/ICHVE53725.2022.10014504","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.10014504","url":null,"abstract":"Continuous promotion and sustainable development of ultra-high voltage(UHV) transmission engineering construction in China has brought significant attention to the UHV post composite insulator owing to its unique advantages. However, the core diameter of ±800kV post composite insulator used in UHV engineering is almost larger than φ280mm.From the aspects of structural design, component preparation and performance test, the research of ‘large-diameter’ is highly significant. In terms of structural design, the researchers mainly use the mechanical load theory calculation or finite element simulation to explore the key nodes and the overall stress of the post composite insulator, and put forward the theory of optimizing the section design and the fixture fixing method, which lays the foundation for the structural design, improvement and optimization of large-diameter post composite insulator. The research on component preparation could be divided into two aspects: material formulation and molding process. For ‘large-diameter’ core cracking, insulation degradation and other issues, many studies have been carried out on toughening modification of epoxy resin, hydrophobic migration and recovery ability of sheds materials (high temperature vulcanized silicone rubber, hydrophobic aliphatic epoxy resin (HCEP)), optimization of curing conditions, and improvement of interfacial strength. However, there is still progressive space. The long-term operation reliability of toughened large-diameter core has not been studied yet. Moreover, the application of HCEP has not yet formed a general formula system. In terms of performance testing, have been done and obtained engineering conclusions research on the mechanical and electrical properties, seismic performance and aging characteristics of large-diameter post composite insulators. With the development of UHV transmission projects, the Chinese national standards have been gradually improved, while the post composite insulator materials still need to be continuously studied. In this work, the development trend of UHV large-diameter post composite insulators research were prospected. The summary of these research results would provide reference for the development of UHV large-diameter post composite insulators in the future.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127980735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intelligent Diagnosis Method of GIS Mechanical Performance Based on VGG16","authors":"Jipan Li, Shoubin Yin, Hongling Liu, Shuofeng Niu, Junjie Zhao, Qiang Wang","doi":"10.1109/ICHVE53725.2022.9961510","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961510","url":null,"abstract":"Mechanical fault is a common fault type in gas insulated switchgear (GIS). The mechanical performance of GIS is very important for the safe and stable operation of power system. In order to achieve accurate diagnosis of GIS mechanical fault, this paper proposes a feature fusion method based on VGG16 and multi-source signals. Firstly, fault simulation test was carried out on a real GIS prototype and feature signals were collected. Wavelet transform was used to obtain the wavelet scale coefficient map of feature signals and then the map was fused. Then adversarial generative network (WGAN) is used to expand the fused samples. Finally, VGG16 network is used to realize sample discrimination, and then complete GIS mechanical fault diagnosis. Experimental results show that the fault diagnosis accuracy of the proposed method is up to 95%, which is higher than that of traditional diagnosis methods, and the fusion samples have richer features than single signals. Meanwhile, the sample set expanded by data enhancement method can effectively solve the problem of insufficient generalization ability of deep learning classifier caused by the lack of samples.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125341082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on Decommissioning Strategy of Old Transformer Based on Economic Life","authors":"L. Bao, Xi Zhang, Yao Yuan, Jiahui Yang, Y. Lei, Kejie Huang, Shuaibing Wang","doi":"10.1109/ICHVE53725.2022.9961474","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961474","url":null,"abstract":"The aging of transformer is a challenging problem faced by power grid system. When the transformer approaches the end of its service life or the test cannot pass and cannot be repaired, the risk of accidents in the continuous operation of the transformer increased. At this time, the equipment needs to be retired according to the relevant decommissioning guidelines, especially the design life of the transformer. In practice, the design life of transformers was 30~40 years. But at present, the vast majority of retired transformers do not exceed the their design life. The investment benefit of transformer was low, resulting in huge waste and loss. In order to improve the asset utilization of transformers, it is necessary to study and quantify the use cost and operation risk of the whole life cycle of transformers, which can be used to support the formulation of decommissioning strategy for old transformers. Firstly, the operation risks of old transformers and the reasons for the decommissioning of transformers were summarized and analyzed in this paper. Then the the method to determine the economic life of transformers was put forward. Taking 220kV power transformer as an example, its LCC cost curve and annual average cost curve were calculated, and its economic life was obtained. Finally, the decommissioning principles and decommissioning disposal strategies of old transformers was put forward, so as to improve the utilization rate of transformer assets.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125398917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of Characteristic Gases Diffusion Coefficients in Transformer Oil","authors":"Dan Zhou, Zhiqin Ma, L. Zhong, Yuan La, M. Fu, Xian Yang, Yuhui Jin, R. Zhuo, Zhiming Huang, Chunyao Lin, Xiang Shu, Shuo Jiang","doi":"10.1109/ICHVE53725.2022.10014480","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.10014480","url":null,"abstract":"Due to various reasons, large power transformers will inevitably produce bubble impurities with characteristic gases such as hydrogen, carbon monoxide, carbon dioxide, methane, ethane, ethylene, and acetylene as the main components. The content of characteristic gases at different locations provides important information for the operating status of the transformer. In order to simulate the transport of characteristic gases, it is necessary to obtain their diffusion coefficients in transformer oil. In this paper, the basic principle of the bubble dissolution method was used to build an experimental platform to efficiently determine the diffusion coefficients of hydrogen, ethane and ethylene in transformer oil at $25^{circ}mathrm{C}$., the measured values are $1.4times 10^{-5}text{cm}^{2}/mathrm{s}$ for H2, $1.6times 10^{-6}text{cm}^{2}/mathrm{s}$ for $mathrm{C}_{2}mathrm{H}_{6}$, and $1.1times 10^{-6}$ cm ${}^{2}/mathrm{s}$ for $mathrm{C}_{2}mathrm{H}_{4}$, with transformer oil degassed at 2 Pa for 20 min. It was found that inadequate degassing led to notably underestimated diffusion coefficients.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125601393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on soil conductive path based on micro-element statistical method","authors":"Zude Lu, Yaozheng Ji, Xiaobin Cao, Qiheng Ma, Tao Li, Ruifang Li","doi":"10.1109/ICHVE53725.2022.9961570","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961570","url":null,"abstract":"Soil conductivity will directly determine the stability of grounding system, and the cost of grounding system will vary up to 100 times due to the difference of soil resistivity in different areas under the same grounding resistance. Soil, as a porous medium, has a large number of pores between solid mineral particles, and ions can migrate through the channels formed by pore water, thus forming electric currents. Existing studies have found that the resistivity of the soil will change constantly with the change of water content, and there is a mutation phenomenon, but considering the soil water conductivity is highest, so can only guess at mutation reason is caused by the connectivity of water distribution. In this paper, MATLAB software was used to write a program to establish a soil fractal model, and then ANSYS simulation software was used to solve the problem, so as to analyze the conductivity of the soil model, and statistical analysis of the apparent conductivity of water micro-element in the soil and study its distribution in the soil model. In addition, the connectivity of soil resistivity at different times before and after the mutation was further studied and the number of cells contained in the conduction path of soil was counted. By controlling the variation of soil water content parameter, the distribution of cell number in soil conduction path in each column of soil model was studied. It was found that with the increase of soil water content, the distribution range of cell number in each column increased, and the fluctuation of numerical value decreased significantly. Therefore, the mean value and variance were introduced to analyze the variation rule of data. On the basis of this study, the influence of porosity on soil conductive path can be studied by changing the size of porosity.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126773072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A 10kV Modular Solid Boost-Marx Pulse Generator With Inductive Isolation","authors":"Yaobin Jin, Wenjie Sun, Liang Yu, Dazhao He, Shoulong Dong, C. Yao","doi":"10.1109/ICHVE53725.2022.9961378","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961378","url":null,"abstract":"Solid-state Marx pulse generators are widely used in biomedical electroporation, food processing, and plasma material modification. It uses parallel charging of energy storage capacitors and series discharging to achieve high-voltage pulse output. However, the isolation resistance used to charge the energy storage capacitor seriously affects the generator's charging speed and overall efficiency during high-frequency pulse output. In this paper, an inductor is selected as an isolation device in a traditional solid-state Marx circuit. And only add a switch in the circuit to form a solid-state boost-Marx pulse generator (BMPG). The added switch is equal to the voltage level of each module in the circuit. The output pulse amplitude is several times, and the efficiency is increased through the use of energy during the charging and discharging of the inductor. The proposed circuit retains the Marx circuit's advantages in simple structure, stability, reliability, and modularization and improves the output pulse gain and parameter control flexibility. It also reduces the input DC power supply requirement. When using 12 modules, the input DC voltage is only 235V, which can achieve 10kV high-voltage pulse output. The pulse voltage boost multiple can reach 42.5 times.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126878264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cable Loading in Tunnels Based on Efficient Multi-physics Simulation Method","authors":"L. Gu, G. Zhang, Z. Han, L. Li, Y. Liu, Y. Li, X. Zhao","doi":"10.1109/ICHVE53725.2022.9961768","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961768","url":null,"abstract":"Electricity-heat-flow calculation supports cable loading design in tunnels. Analytical method based on IEC-60287 does not consider the corrugated sheath in detail. This paper proposes an efficient simulation approach for cables with corrugated sheath based on finite element method. The efficiency of the proposed mothed is 4 times as the original one, based on which a 200m tunnel with 24 high voltage cables is established to study the influence of wind velocity on temperature distribution. The cooling effect is more obvious with wind velocity lower than 3m/s. Maximum cable loading is also derived for different wind velocities. Furthermore, cable position and tunnel structure effect on the temperature are analyzed. Simulation results show that further away from the tunnel wall with 0.3m can reduce the temperature by about 3°C. While round shape tunnel leads to lower temperature than rectangular one with the same area.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"231 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121454027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative Assessment Model of Moisture Equilibrium in Paper-oil Insulation","authors":"Meng Gao, R. Zhuo, M. Fu, L. Jia, Guoli Wang, Yuan La","doi":"10.1109/ICHVE53725.2022.9961441","DOIUrl":"https://doi.org/10.1109/ICHVE53725.2022.9961441","url":null,"abstract":"This paper presents a quantitative method to obtain the rule of water balance between oil and paper efficiently, which can be used in both engineering and laboratory conditions. Firstly, the mechanism of moisture migration in the oil-paper system was clarified, based on which the method of diffusion potential was proposed to quantitatively describe the water diffusion trend of insulating paper and insulating oil. By setting up the experimental platform, the moisture content in the insulating paper under different vapor pressures and temperatures was obtained, and a mathematical formula was established to describe the quantitative relationship. Since the difference in water solubility of mineral insulating oils was small, the mathematical relation between water vapor pressure and temperature and water content of insulating oils in standard IEC-60422 could be referred. The temperature control equation of moisture content in insulating paper and oil was obtained according to the pressure balance rule. Finally, the equation to describe the variation of moisture content in paper with oil moisture, time, and the temperature was established. Besides, a mathematical model is set for the estimation of moisture content in single-layer paper at varying temperatures.","PeriodicalId":125983,"journal":{"name":"2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126070385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}