Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279524
Ke Wang, Jinyuan Liu, Gang Li, Jinzhong Li, Shuqi Zhang, Yang Yan, Chao Wu
High voltage (HV) current transformer with oil-impregnated paper insulation is one of the most important electrical apparatus in power substation, where the temperature distribution as well as maximum hot-spot temperature have significant impacts on its long-term safe operation. In the current work, the loss and temperature distribution of 550kV inverted current transformer with oil-impregnated paper insulation are investigated by three-dimensional (3-D) finite element method (FEM) and computation. The electro-magnetic-thermal field coupling model is designed according to the rated operation condition. The computational results show that the Joule loss of conductive rod on the primary side is 180W which is the main heat source of the transformer in rated operation. The dielectric loss of insulating layer and the eddy current loss of cores are 63.2W and 69.3W, respectively, which cannot be ignored. The hot-spot temperature of current transformer is near the core. And the maximum temperature rise is obtained as 31K relevant to the rated current of 4000A.
{"title":"3-D FEM Analysis of Loss and Temperature Distribution in Steady State for 550kV Oil Immersed Current Transformer","authors":"Ke Wang, Jinyuan Liu, Gang Li, Jinzhong Li, Shuqi Zhang, Yang Yan, Chao Wu","doi":"10.1109/ICHVE49031.2020.9279524","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279524","url":null,"abstract":"High voltage (HV) current transformer with oil-impregnated paper insulation is one of the most important electrical apparatus in power substation, where the temperature distribution as well as maximum hot-spot temperature have significant impacts on its long-term safe operation. In the current work, the loss and temperature distribution of 550kV inverted current transformer with oil-impregnated paper insulation are investigated by three-dimensional (3-D) finite element method (FEM) and computation. The electro-magnetic-thermal field coupling model is designed according to the rated operation condition. The computational results show that the Joule loss of conductive rod on the primary side is 180W which is the main heat source of the transformer in rated operation. The dielectric loss of insulating layer and the eddy current loss of cores are 63.2W and 69.3W, respectively, which cannot be ignored. The hot-spot temperature of current transformer is near the core. And the maximum temperature rise is obtained as 31K relevant to the rated current of 4000A.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"7 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86884889","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}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279649
Sihan Liu, R. Han, Chenyang Zhang, Manyu Wang, Tongkai Zhang, J. Ouyang
Plasma has shown excellent potential prospects in sterilization applications nowadays. In this paper, we firstly design a novel sterilizer based on bipolar corona discharge of needle-dielectric-needle configuration. With the help of the dielectric plate, the new sterilizer can effectively avoid spark or arc discharge and eventually converge into a neutral ionic wind. The electrical and optical characteristics of bipolar corona discharge were studied in detail, and the ionic wind velocity with different electrode spacings was measured. The results revealed that the average current had a quadratic relationship with the overvoltage following Townsend relation, and the ionic wind velocity was positively correlated with the overvoltage. Furthermore, we simply estimated the sterilization effect of bipolar corona discharge. It was found that the sterilization efficiency increases with the increase of exposure time, and decreases with the rise of distance from the grounded electrode to the petri dish. In particular, the bipolar corona has a satisfactory sterilization efficiency which can reach 100% at 6 minutes.
{"title":"Study on Ionic Wind of Bipolar Corona and Its Sterilization Effect","authors":"Sihan Liu, R. Han, Chenyang Zhang, Manyu Wang, Tongkai Zhang, J. Ouyang","doi":"10.1109/ICHVE49031.2020.9279649","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279649","url":null,"abstract":"Plasma has shown excellent potential prospects in sterilization applications nowadays. In this paper, we firstly design a novel sterilizer based on bipolar corona discharge of needle-dielectric-needle configuration. With the help of the dielectric plate, the new sterilizer can effectively avoid spark or arc discharge and eventually converge into a neutral ionic wind. The electrical and optical characteristics of bipolar corona discharge were studied in detail, and the ionic wind velocity with different electrode spacings was measured. The results revealed that the average current had a quadratic relationship with the overvoltage following Townsend relation, and the ionic wind velocity was positively correlated with the overvoltage. Furthermore, we simply estimated the sterilization effect of bipolar corona discharge. It was found that the sterilization efficiency increases with the increase of exposure time, and decreases with the rise of distance from the grounded electrode to the petri dish. In particular, the bipolar corona has a satisfactory sterilization efficiency which can reach 100% at 6 minutes.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"59 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86891625","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}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279602
Bo Niu, Yuhua Xu, Feiyue Ma, Xiu Zhou, Lei Chen, Yin Wei
Pre-insertion resistors (PIR) is used to suppress the inrush current and transient over voltages in the closing of circuit breaker, and its special application results in a high failure rate. This paper first takes 750 kV AC filter banks circuit breaker PIR as a model, and three typical defects of PIR are simulated by COMSOL. Then, according to the simulation results, the defect analysis methods of dynamic resistance fitting method, and PIR current impulse, PIR voltage impulse are presented. Finally, the combined circuit breaker control strategy which combining the series of PIR circuit breaker with the phase-selecting closing device is proposed, and the optimal combination strategy is given through PSCAD.
{"title":"Reliability Analysis of Pre-insertion Resistors for EHV/UHV SF6 Circuit Breakers","authors":"Bo Niu, Yuhua Xu, Feiyue Ma, Xiu Zhou, Lei Chen, Yin Wei","doi":"10.1109/ICHVE49031.2020.9279602","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279602","url":null,"abstract":"Pre-insertion resistors (PIR) is used to suppress the inrush current and transient over voltages in the closing of circuit breaker, and its special application results in a high failure rate. This paper first takes 750 kV AC filter banks circuit breaker PIR as a model, and three typical defects of PIR are simulated by COMSOL. Then, according to the simulation results, the defect analysis methods of dynamic resistance fitting method, and PIR current impulse, PIR voltage impulse are presented. Finally, the combined circuit breaker control strategy which combining the series of PIR circuit breaker with the phase-selecting closing device is proposed, and the optimal combination strategy is given through PSCAD.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"18 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86931242","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}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279767
Jianying Zhong, G. Han, Jia Zhang, Xin Lin, Zhenxin Geng, Jianyuan Xu, Guanglei Sun
The insulation strength of high-voltage switchgear opening and closing break is the basis to ensure its safe operation, and it is also one of the important factors affecting its successful closing and breaking. In order to study the break insulation characteristics of the mixed gas of perfluoroisobutyronitrile (C4F7N) and carbon dioxide (CO2), Build a test and research platform for dynamic insulation characteristics of C4F7N/CO2 mixed gas break of the prototype circuit breaker closing-opening process under no-load high DC voltage, Measure the base pressure of 0.7MPa arc extinguishing chamber, the dynamic breakdown voltage of pure SF6, 5%C4F7N/95%CO2, 9%C4F7N/91%CO2 and 13%C4F7N/ 87%CO2 mixed gas, study mixed gas break insulation strength changes. The results show that, compared with pure SF6, C4F7N/CO2 mixed gas break dynamic breakdown voltage dispersion is greater, the expected penetration time is longer than SF6; increase the content of C4F7N in the mixed gas, The rate of change of the dielectric strength of the mixed gas break is improved.
{"title":"Experimental Research on Break Dynamic Insulation Characteristics of C4F7N/CO2Mixed Gas","authors":"Jianying Zhong, G. Han, Jia Zhang, Xin Lin, Zhenxin Geng, Jianyuan Xu, Guanglei Sun","doi":"10.1109/ICHVE49031.2020.9279767","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279767","url":null,"abstract":"The insulation strength of high-voltage switchgear opening and closing break is the basis to ensure its safe operation, and it is also one of the important factors affecting its successful closing and breaking. In order to study the break insulation characteristics of the mixed gas of perfluoroisobutyronitrile (C<inf>4</inf>F<inf>7</inf>N) and carbon dioxide (CO<inf>2</inf>), Build a test and research platform for dynamic insulation characteristics of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixed gas break of the prototype circuit breaker closing-opening process under no-load high DC voltage, Measure the base pressure of 0.7MPa arc extinguishing chamber, the dynamic breakdown voltage of pure SF<inf>6</inf>, 5%C<inf>4</inf>F<inf>7</inf>N/95%CO<inf>2</inf>, 9%C<inf>4</inf>F<inf>7</inf>N/91%CO<inf>2</inf> and 13%C<inf>4</inf>F<inf>7</inf>N/ 87%CO<inf>2</inf> mixed gas, study mixed gas break insulation strength changes. The results show that, compared with pure SF<inf>6</inf>, C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixed gas break dynamic breakdown voltage dispersion is greater, the expected penetration time is longer than SF<inf>6</inf>; increase the content of C<inf>4</inf>F<inf>7</inf>N in the mixed gas, The rate of change of the dielectric strength of the mixed gas break is improved.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"15 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87763304","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}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279997
Yongsen Han, Jian Sun, Guanyu Chen, Zihan Xu, Zhonghua Li
As titanium carbide (TiC) shows excellent electrical and mechanical properties, polyethylene (PE)/TiC nano-composites are prepared. The filler loading is 0, 0.5, 1, 5 and 10 wt%. The different scanning thermal analyzer, dielectric spectrum instrument and conduction measurement are, respectively, used to measure the crystallinity, relative permittivity and dc conductivity of PE/TiC nano-composites. Experimental results show that the crystallinity of PE/TiC nano-composites firstly increases and then deceases with filler loading. The 0.5 wt% and 1 wt% PE/TiC nano-composites show lower relative permittivity than pure PE. The 5 wt% and 10 wt% PE/TiC nano-composites show higher relative permittivity than pure PE. The dc conductivity of PE/TiC nano-composites firsly decrease then increase with the increasing filler loading. In addition, compared with pure PE, PE/TiC nano-composites have smaller change with the increasing temperature. The PE/TiC nano-composites are beneficial to improve the electrical performance of cables.
{"title":"Study on Electrical Properties of PE/TiC Nano-composites","authors":"Yongsen Han, Jian Sun, Guanyu Chen, Zihan Xu, Zhonghua Li","doi":"10.1109/ICHVE49031.2020.9279997","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279997","url":null,"abstract":"As titanium carbide (TiC) shows excellent electrical and mechanical properties, polyethylene (PE)/TiC nano-composites are prepared. The filler loading is 0, 0.5, 1, 5 and 10 wt%. The different scanning thermal analyzer, dielectric spectrum instrument and conduction measurement are, respectively, used to measure the crystallinity, relative permittivity and dc conductivity of PE/TiC nano-composites. Experimental results show that the crystallinity of PE/TiC nano-composites firstly increases and then deceases with filler loading. The 0.5 wt% and 1 wt% PE/TiC nano-composites show lower relative permittivity than pure PE. The 5 wt% and 10 wt% PE/TiC nano-composites show higher relative permittivity than pure PE. The dc conductivity of PE/TiC nano-composites firsly decrease then increase with the increasing filler loading. In addition, compared with pure PE, PE/TiC nano-composites have smaller change with the increasing temperature. The PE/TiC nano-composites are beneficial to improve the electrical performance of cables.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"145 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88443624","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}
Pub Date : 2020-09-06DOI: 10.1109/ichve49031.2020.9279949
Hao Wen, Lin Cheng, Yi Jiang, Taiyun Zhu, Zhong Chen
In this paper, the EP/SrTiO3and EPIBaTiO3nanocomposite were prepared by adopting SrTiO3or BaTiO3nanoparticles as fillers respectively. Thermal conductivity, dielectric spectrum, breakdown strength and flashover characteristics of the composites were investigated. The results reveal thermal conductivity and dielectric constant of EP/SrTiO3nanocomposite are higher than that of EP/BaTiO3nanocomposite with the same mass fraction. Owing to uniform distribution of nanoparticles in the epoxy resin matrix, both EP/SrTiO3and EP/BaTiO3nanocomposite have an improved breakdown field strength which increase with the mass fraction of filler. Moreover, incorporation of nanoparticles can help repair the potential defects inside the epoxy resin, creating a denser and smoother structure. Flashover experiment on the surface of sample under the microsecond pulse voltage proves that the flashover voltages of the nanocomposite are higher than that of the pure epoxy resin. Flashover voltages of EP/SrTiO3are slightly higher than that of EP/BaTiO3. To draw a conclusion, filling SrTiO3or BaTiO3nanoparticles can improve the thermal conductivity and insulating property of epoxy resin, especially the flashover voltage increases significantly. The novel composite would lay a foundation for the development of energy storage material and multifunctional dielectric material.
{"title":"Comparative study on thermal and electrical properties of EP/SrTiO3and EP/BaTiO3nanocomposites","authors":"Hao Wen, Lin Cheng, Yi Jiang, Taiyun Zhu, Zhong Chen","doi":"10.1109/ichve49031.2020.9279949","DOIUrl":"https://doi.org/10.1109/ichve49031.2020.9279949","url":null,"abstract":"In this paper, the EP/SrTiO3and EPIBaTiO3nanocomposite were prepared by adopting SrTiO3or BaTiO3nanoparticles as fillers respectively. Thermal conductivity, dielectric spectrum, breakdown strength and flashover characteristics of the composites were investigated. The results reveal thermal conductivity and dielectric constant of EP/SrTiO3nanocomposite are higher than that of EP/BaTiO3nanocomposite with the same mass fraction. Owing to uniform distribution of nanoparticles in the epoxy resin matrix, both EP/SrTiO3and EP/BaTiO3nanocomposite have an improved breakdown field strength which increase with the mass fraction of filler. Moreover, incorporation of nanoparticles can help repair the potential defects inside the epoxy resin, creating a denser and smoother structure. Flashover experiment on the surface of sample under the microsecond pulse voltage proves that the flashover voltages of the nanocomposite are higher than that of the pure epoxy resin. Flashover voltages of EP/SrTiO3are slightly higher than that of EP/BaTiO3. To draw a conclusion, filling SrTiO3or BaTiO3nanoparticles can improve the thermal conductivity and insulating property of epoxy resin, especially the flashover voltage increases significantly. The novel composite would lay a foundation for the development of energy storage material and multifunctional dielectric material.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"14 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86171937","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}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279906
Ruishuang Zhong, Y. Qian, Y. Zang, Hui Wang, Xiuchen Jiang, G. Sheng, Su Zhao, Yunkun Deng, D. Xiao
In order to study an alternative SF6 gas medium, molecular theory and density functional theory (DFT) were used to analyze $mathrm{C}_{3}mathrm{F}_{8}$ as a substitute for SF 6 gas from microscopic properties. This paper aimed to adopt the Boltzmann equation method to calculation the electron transport coefficients and synergistic effect of $mathrm{C}_{3}mathrm{F}_{8}/text{CF}_{3}mathrm{I}/text{CO}_{2}$ ternary gas mixtures, and compared with $mathrm{c}-mathrm{C}_{4}mathrm{F}_{8}/text{CF}_{3}mathrm{I}/text{CO}_{2}$ of same proportion. The results indicate that when E/N is lower than 400Td, the performance of $mathrm{C}_{3}mathrm{F}_{8}$ gas mixtures is better than that of $mathrm{c}-mathrm{C}_{3}mathrm{F}_{8}$ gas mixtures in terms of diffusion coefficient and electron drift velocity. When the proportion of $mathrm{C}_{3}mathrm{F}_{8}$ is less than 7%, the insulation strength of gas mixtures is higher than that of $30%mathrm{SF}_{6} /70%mathrm{CO}_{2}$ gas mixtures. As for synergistic effect, for $mathrm{C}_{3}text{Fs}/text{CF}_{3}mathrm{I}/text{CO}_{2}$ is most obvious when the content of $mathrm{C}_{3}mathrm{F}_{8}$ is about 10%. The research results in this paper provide a theoretical basis for $mathrm{C}_{3}mathrm{F}_{8}$ ternary gas mixtures as a potential replacement gas for SF6.
{"title":"Insulation Characteristics of C3F8 Ternary Gas Mixtures from Electron Transport Parameters and Microscopic Properties","authors":"Ruishuang Zhong, Y. Qian, Y. Zang, Hui Wang, Xiuchen Jiang, G. Sheng, Su Zhao, Yunkun Deng, D. Xiao","doi":"10.1109/ICHVE49031.2020.9279906","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279906","url":null,"abstract":"In order to study an alternative SF6 gas medium, molecular theory and density functional theory (DFT) were used to analyze $mathrm{C}_{3}mathrm{F}_{8}$ as a substitute for SF 6 gas from microscopic properties. This paper aimed to adopt the Boltzmann equation method to calculation the electron transport coefficients and synergistic effect of $mathrm{C}_{3}mathrm{F}_{8}/text{CF}_{3}mathrm{I}/text{CO}_{2}$ ternary gas mixtures, and compared with $mathrm{c}-mathrm{C}_{4}mathrm{F}_{8}/text{CF}_{3}mathrm{I}/text{CO}_{2}$ of same proportion. The results indicate that when E/N is lower than 400Td, the performance of $mathrm{C}_{3}mathrm{F}_{8}$ gas mixtures is better than that of $mathrm{c}-mathrm{C}_{3}mathrm{F}_{8}$ gas mixtures in terms of diffusion coefficient and electron drift velocity. When the proportion of $mathrm{C}_{3}mathrm{F}_{8}$ is less than 7%, the insulation strength of gas mixtures is higher than that of $30%mathrm{SF}_{6} /70%mathrm{CO}_{2}$ gas mixtures. As for synergistic effect, for $mathrm{C}_{3}text{Fs}/text{CF}_{3}mathrm{I}/text{CO}_{2}$ is most obvious when the content of $mathrm{C}_{3}mathrm{F}_{8}$ is about 10%. The research results in this paper provide a theoretical basis for $mathrm{C}_{3}mathrm{F}_{8}$ ternary gas mixtures as a potential replacement gas for SF6.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"16 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86300240","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}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279976
Zhenguo Wang, Te Li, Shaohua Wang, Xiangxian Zhou, Luyao Zhou, L. Ni
The detour lighting has become the primary factor affecting the reliability of UHVDC transmission lines, and the surge arrester is one of the most important measures in lightning protection. This paper takes $pm 800mathrm{kV}$ Yibin-Jinhua UHVDC transmission line as example evaluating the performance of the surge arrester based on the lightning simulation. The protective performance of the arrester for two typical towers under single return stroke are calculated and analyzed. The detour lightning resistance level with and without the lighting arrester is compared, and the influence of the tower wave impedance and the grounding resistance is obtained. The simulation results show that with the installation of the arrester, the detour lightning resistance level of the UHVDC transmission lines can be significantly improved. The tower wave impedance has little effect on the detour lightning resistance level which can be ignored. With the increase of the tower ground resistance, the arrester shows slight decrease in peak current and absorbed energy.
{"title":"Evaluation of the Protective Performance of the Lightning Arrester for the Lightning Shielding Failure of $pm 800mathrm{kV}$ Yibin-Jinhua UHVDC Transmission Line","authors":"Zhenguo Wang, Te Li, Shaohua Wang, Xiangxian Zhou, Luyao Zhou, L. Ni","doi":"10.1109/ICHVE49031.2020.9279976","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279976","url":null,"abstract":"The detour lighting has become the primary factor affecting the reliability of UHVDC transmission lines, and the surge arrester is one of the most important measures in lightning protection. This paper takes $pm 800mathrm{kV}$ Yibin-Jinhua UHVDC transmission line as example evaluating the performance of the surge arrester based on the lightning simulation. The protective performance of the arrester for two typical towers under single return stroke are calculated and analyzed. The detour lightning resistance level with and without the lighting arrester is compared, and the influence of the tower wave impedance and the grounding resistance is obtained. The simulation results show that with the installation of the arrester, the detour lightning resistance level of the UHVDC transmission lines can be significantly improved. The tower wave impedance has little effect on the detour lightning resistance level which can be ignored. With the increase of the tower ground resistance, the arrester shows slight decrease in peak current and absorbed energy.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86381000","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}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279567
Jian Zou, Xia Zheng, N. Zeng, Xingdong Jiang, Tianjue Zhang
In order to study the key technology of pulse x-ray for breast cancer diagnosis in medical system, a pulse punctual X-ray source system is developed. The system is composed of pulse source, pulse x-ray tube and optical focusing lens. The pulse source is composed of Marx generator, spark gap switch, capacitor voltage divider and output section, and the compact and movable design is adopted; the pulse x-ray tube is designed with a This method can effectively improve the repetition rate of x-ray point source location, and adjust the material and distance of anode and cathode according to different driving voltage; the focusing lens adopts the design of poly-capillary Xray lens, and uses the total reflection mechanism of X-ray in the lens, which has a large flux focusing Characteristic. The experimental results show that when the output voltage of the pulse source is 165kv, the rise time is about 10ns, and the pulse width is about 100ns, the system can radiate a pulse width nanosecond X-ray with a diameter of about 100 µ m and an energy of about 15kev, and the image of the organism can be obtained by using this ray.
{"title":"Design and research of the discharge system of the pulse collimator","authors":"Jian Zou, Xia Zheng, N. Zeng, Xingdong Jiang, Tianjue Zhang","doi":"10.1109/ICHVE49031.2020.9279567","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279567","url":null,"abstract":"In order to study the key technology of pulse x-ray for breast cancer diagnosis in medical system, a pulse punctual X-ray source system is developed. The system is composed of pulse source, pulse x-ray tube and optical focusing lens. The pulse source is composed of Marx generator, spark gap switch, capacitor voltage divider and output section, and the compact and movable design is adopted; the pulse x-ray tube is designed with a This method can effectively improve the repetition rate of x-ray point source location, and adjust the material and distance of anode and cathode according to different driving voltage; the focusing lens adopts the design of poly-capillary Xray lens, and uses the total reflection mechanism of X-ray in the lens, which has a large flux focusing Characteristic. The experimental results show that when the output voltage of the pulse source is 165kv, the rise time is about 10ns, and the pulse width is about 100ns, the system can radiate a pulse width nanosecond X-ray with a diameter of about 100 µ m and an energy of about 15kev, and the image of the organism can be obtained by using this ray.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"35 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82669927","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}
The characteristics of residual charges on the inserted barrier surfaces in different air-insulated insulation systems after alternating breakdowns are investigated. High voltage withstand tests and surface potential measurements were carried out. The results show that the potential polarity on the barrier surface is related to the voltage polarity at the moment of breakdown. The barrier surface potential where the discharge passes through is lower. Compared with the barrier position, the electrode radius has a more significant effect on the surface potential distribution after breakdown. As the electrode radius increases, the positive surface potential is higher and the area with the potential higher than 3 kV is larger. The surface potential decays slowly when the barrier is suspended. At last, the effect of residual charges revealed by the surface potential is discussed.
{"title":"Residual Charges on Barrier Surface Revealed by Potential Distribution in a Hybrid Gas-Solid Insulation System","authors":"Yilong Wang, Qiongqiong Li, Shengwen Shu, Yuesheng Zheng","doi":"10.1109/ICHVE49031.2020.9279551","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279551","url":null,"abstract":"The characteristics of residual charges on the inserted barrier surfaces in different air-insulated insulation systems after alternating breakdowns are investigated. High voltage withstand tests and surface potential measurements were carried out. The results show that the potential polarity on the barrier surface is related to the voltage polarity at the moment of breakdown. The barrier surface potential where the discharge passes through is lower. Compared with the barrier position, the electrode radius has a more significant effect on the surface potential distribution after breakdown. As the electrode radius increases, the positive surface potential is higher and the area with the potential higher than 3 kV is larger. The surface potential decays slowly when the barrier is suspended. At last, the effect of residual charges revealed by the surface potential is discussed.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"18 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82706894","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}
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