Pub Date : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928913
Jinkun Tu, B. Xiang, Lei Gao, Jianhua Wang, Zhiyuan Liu, Yingsan Geng
Voltage Sourced Converter based High Voltage Direct Current (VSC-HVDC) technology is an advanced DC transmission technology. The short circuit fault current of VSC system is difficult to break because of its high amplitude and high rate of rise. Appling resistance type Superconducting Fault Current Limiter (RSFCL) is beneficial to VSC-HVDC system. When VSC system works normally, the RSFCL has no effect on the system. However, due to the resistance of RSFCL will be large after the complete quench, RSFCL can reduce the amplitude of the short-circuit current, reduce the decreasing rate of system voltage sag. It will also impact the strategies of failure protection due to large quenched resistance. Because Flexible DC Transmission System of Offshore Oil Production Platform uses VSC-HVDC technology, RSFCL is also useful. In this paper, the basic working principles of RSFCL and Offshore Oil Production Platform are described. The performance of DC circuit breaker is not good in high pollution environment, RSFCL can limit short circuit current and is less affected by the environment. So it is a good idea to combine RSFCL with DC circuit breaker in this condition. Then, referring to the parameters of China National Offshore Oil Corporation (CNOOC) Wenchang Flexible DC Transmission System and RSFCL, a simulation model of this system based on PSCAD/EMTDC is built. The results show that when the flexible DC system works normally, the RSFCL operates at a steady state and low loss, has no obvious influence on the system. When there is a short circuit fault, the impedance of the RSFCL increases. The RSFCL will limit the short circuit current to 2.33 times of the rated current and effectively delay the system voltage sag. The DC voltage of Flexible DC Transmission System of Offshore Oil Production Platform without RSFCL drops rapidly to 0 V within 7ms after short-circuit fault occurs. But after appling RSFCL, the DC voltage recovers to more than 80 % of its peak , so the converter stations will not blocking.
{"title":"Effects of Current Limiting Characteristics of Resistive Type Superconducting Fault Current Limiter on Flexible DC Transmission System of Offshore Oil Production Platform","authors":"Jinkun Tu, B. Xiang, Lei Gao, Jianhua Wang, Zhiyuan Liu, Yingsan Geng","doi":"10.1109/ICEPE-ST.2019.8928913","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928913","url":null,"abstract":"Voltage Sourced Converter based High Voltage Direct Current (VSC-HVDC) technology is an advanced DC transmission technology. The short circuit fault current of VSC system is difficult to break because of its high amplitude and high rate of rise. Appling resistance type Superconducting Fault Current Limiter (RSFCL) is beneficial to VSC-HVDC system. When VSC system works normally, the RSFCL has no effect on the system. However, due to the resistance of RSFCL will be large after the complete quench, RSFCL can reduce the amplitude of the short-circuit current, reduce the decreasing rate of system voltage sag. It will also impact the strategies of failure protection due to large quenched resistance. Because Flexible DC Transmission System of Offshore Oil Production Platform uses VSC-HVDC technology, RSFCL is also useful. In this paper, the basic working principles of RSFCL and Offshore Oil Production Platform are described. The performance of DC circuit breaker is not good in high pollution environment, RSFCL can limit short circuit current and is less affected by the environment. So it is a good idea to combine RSFCL with DC circuit breaker in this condition. Then, referring to the parameters of China National Offshore Oil Corporation (CNOOC) Wenchang Flexible DC Transmission System and RSFCL, a simulation model of this system based on PSCAD/EMTDC is built. The results show that when the flexible DC system works normally, the RSFCL operates at a steady state and low loss, has no obvious influence on the system. When there is a short circuit fault, the impedance of the RSFCL increases. The RSFCL will limit the short circuit current to 2.33 times of the rated current and effectively delay the system voltage sag. The DC voltage of Flexible DC Transmission System of Offshore Oil Production Platform without RSFCL drops rapidly to 0 V within 7ms after short-circuit fault occurs. But after appling RSFCL, the DC voltage recovers to more than 80 % of its peak , so the converter stations will not blocking.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124365499","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}
TiB2 granules have the characteristics of high hardness, small volume resistance and not easy to be oxidized. As a pressure control material, its contact resistance will change significantly under the external pressure. It can be applied in the field of current transfer due to its fast change in resistance, including transfer current limiting and DC transfer breaking. In this paper, the pressure-resistance characteristics of the pressure control material are measured, and the relationship between pressure and resistance is obtained and fitted into a function. Then, a mathematical model of the pressure control material is established in the PSCAD, and the model is series connected with a vacuum interrupter to form a current transfer module. The module is connected in parallel with the current limiting reactor to form a new type of fault current limiter and connected in parallel with the IGBT module to form a DC circuit breaker. The current transfer during the resistance change is studied. The simulation results show that the current can be quickly transferred within a few milliseconds. During the current transfer, overvoltage will generate. Therefore, overvoltage protection and timing control need to be considered.
{"title":"Research on Pressure Control Material Based on Granular System in Current Transfer","authors":"Yu Zhu, Enyuan Dong, Mingjie Li, Huan He, Zirong Zhang, X. Guo","doi":"10.1109/ICEPE-ST.2019.8928808","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928808","url":null,"abstract":"TiB2 granules have the characteristics of high hardness, small volume resistance and not easy to be oxidized. As a pressure control material, its contact resistance will change significantly under the external pressure. It can be applied in the field of current transfer due to its fast change in resistance, including transfer current limiting and DC transfer breaking. In this paper, the pressure-resistance characteristics of the pressure control material are measured, and the relationship between pressure and resistance is obtained and fitted into a function. Then, a mathematical model of the pressure control material is established in the PSCAD, and the model is series connected with a vacuum interrupter to form a current transfer module. The module is connected in parallel with the current limiting reactor to form a new type of fault current limiter and connected in parallel with the IGBT module to form a DC circuit breaker. The current transfer during the resistance change is studied. The simulation results show that the current can be quickly transferred within a few milliseconds. During the current transfer, overvoltage will generate. Therefore, overvoltage protection and timing control need to be considered.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"21 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114400913","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928732
Kyoya Nonaka, T. Koshizuka, T. Shinkai, E. Haginomori, H. Ikeda
In the measurement of the transient recovery voltage (TRV) for short line fault (SLF) artificial line, distinctive TRV waveforms were measured. In the measured waveforms, a center of the TRV voltage oscillation was not constant. Due to the fact, the amplitude factor of the measured TRV was very low. When the SLF artificial line components are composed by linear elements, the center of the TRV oscillation must be constant. And the amplitude of the TRV will be large. This distinctive TRV waveform was generated by the frequency dependence of the air core main reactor for the SLF artificial line. It is shown that the inductance of the main reactor becomes small at high frequency like TRV frequency by skin effect.
{"title":"Investigation of TRV Measurement for SLF Artificial Line","authors":"Kyoya Nonaka, T. Koshizuka, T. Shinkai, E. Haginomori, H. Ikeda","doi":"10.1109/ICEPE-ST.2019.8928732","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928732","url":null,"abstract":"In the measurement of the transient recovery voltage (TRV) for short line fault (SLF) artificial line, distinctive TRV waveforms were measured. In the measured waveforms, a center of the TRV voltage oscillation was not constant. Due to the fact, the amplitude factor of the measured TRV was very low. When the SLF artificial line components are composed by linear elements, the center of the TRV oscillation must be constant. And the amplitude of the TRV will be large. This distinctive TRV waveform was generated by the frequency dependence of the air core main reactor for the SLF artificial line. It is shown that the inductance of the main reactor becomes small at high frequency like TRV frequency by skin effect.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123502620","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928698
Lei Gao, B. Xiang, Jinhui Luo, Zhiyuan Liu, Yingsan Geng, Jianhua Wang, S. Yanabu
Resistive-type superconducting fault current limiter (R-SFCL) is one of the most promising superconducting power equipment. Liquid nitrogen (LN2) and cryogenic nitrogen gas (CGN2) are not only the cooling but also the insulation media for the R-SFCLs. In the R-SFCLs, CGN2 will coexist with the LN2 surface. The objective of this paper is to study the effect of barrier effect on DC dielectric strength of the CGN2 above the LN2 surface. In this paper, firstly the DC breakdown voltage VB of rod-to-plane electrodes with insulation barrier were tested. The gap distance is 13.6 mm. The distance from the rod electrode to the insulation barrier is 1/7, 3/7 and 5/7 of the rod-to-plane gap distance. Secondly the discharge path was observed and analysed by the discharge traces on the insulation barrier. Finally, the discharge model and equivalent circuit were proposed in the paper. The results shown that when the a/b is 1/7, the VB is about two times larger than without the barrier. When the a/b is 5/7, the VB is nearly the same as that without the barrier. The discharge traces shown that the discharge was started in the CGN2, then the insulation barrier broke down. The equivalent circuit shown that the smaller the electrical conductivity of the insulation barrier is , the higher of the breakdown voltage is.
{"title":"Barrier Effect on the DC Breakdown Characteristics of Cryogenic Nitrogen Gas for the Designing of the Superconducting Fault Current Limiter","authors":"Lei Gao, B. Xiang, Jinhui Luo, Zhiyuan Liu, Yingsan Geng, Jianhua Wang, S. Yanabu","doi":"10.1109/ICEPE-ST.2019.8928698","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928698","url":null,"abstract":"Resistive-type superconducting fault current limiter (R-SFCL) is one of the most promising superconducting power equipment. Liquid nitrogen (LN2) and cryogenic nitrogen gas (CGN2) are not only the cooling but also the insulation media for the R-SFCLs. In the R-SFCLs, CGN2 will coexist with the LN2 surface. The objective of this paper is to study the effect of barrier effect on DC dielectric strength of the CGN2 above the LN2 surface. In this paper, firstly the DC breakdown voltage VB of rod-to-plane electrodes with insulation barrier were tested. The gap distance is 13.6 mm. The distance from the rod electrode to the insulation barrier is 1/7, 3/7 and 5/7 of the rod-to-plane gap distance. Secondly the discharge path was observed and analysed by the discharge traces on the insulation barrier. Finally, the discharge model and equivalent circuit were proposed in the paper. The results shown that when the a/b is 1/7, the VB is about two times larger than without the barrier. When the a/b is 5/7, the VB is nearly the same as that without the barrier. The discharge traces shown that the discharge was started in the CGN2, then the insulation barrier broke down. The equivalent circuit shown that the smaller the electrical conductivity of the insulation barrier is , the higher of the breakdown voltage is.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121996152","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928675
Kaimiao Liu, Peng Li, Shi SongZhang, Xiaojun Wang, Bin Yang, Gang Li, X. Shi, Xiao Juan Zhu
This paper compared the interruption , anti-welding and voltage withstand abilities of CuCr30 manufactured by three different ways, in which the influence of different manufactured ways on the electrical performance of vacuum interrupter (VI) was investigated. These results can worked as a reference for the selection of CuCr contacts used in the VI. The tested results compared the electrical performance under various CuCr30 manufactured by three different ways. Firstly, the results indicate that for arc-melted(VAR), powder metallurgy(PM) and vacuum casting(VIM) contacts power frequency withstand ability of those contacts can up to 65.9kV to 55.45kV 56.1kV respective.Secondly interruption times of those contacts is 20±3, 15±4 and 19±3 times and average welding force is 522.8N , 441.8N and 908.8N.
{"title":"Investigate of Electrical Performance of CuCr30 Manufactured by Three Different Ways","authors":"Kaimiao Liu, Peng Li, Shi SongZhang, Xiaojun Wang, Bin Yang, Gang Li, X. Shi, Xiao Juan Zhu","doi":"10.1109/ICEPE-ST.2019.8928675","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928675","url":null,"abstract":"This paper compared the interruption , anti-welding and voltage withstand abilities of CuCr30 manufactured by three different ways, in which the influence of different manufactured ways on the electrical performance of vacuum interrupter (VI) was investigated. These results can worked as a reference for the selection of CuCr contacts used in the VI. The tested results compared the electrical performance under various CuCr30 manufactured by three different ways. Firstly, the results indicate that for arc-melted(VAR), powder metallurgy(PM) and vacuum casting(VIM) contacts power frequency withstand ability of those contacts can up to 65.9kV to 55.45kV 56.1kV respective.Secondly interruption times of those contacts is 20±3, 15±4 and 19±3 times and average welding force is 522.8N , 441.8N and 908.8N.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125702781","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928772
Fuminori Kondo, H. Kojima, H. Fukuda, M. Sakaki, N. Hayakawa
Spark conditioning is an effective method to improve electrical insulation strength of vacuum circuit breakers. We discuss the spark conditioning process in consideration of the generation of micro-protrusions on cathode surface by breakdown. We conducted the spark conditioning on three pairs of rod-plane electrodes made of OFHC Cu. For one pair, the voltages were applied until conditioning saturation, namely 600 times voltage applications. For the others, a smaller number of voltage applications (100 times and 300 times) before conditioning saturation were given. After these conditioning experiments, we observed the surface of rod cathodes with a microscope. After the conditioning by about 600 times voltage applications, many micro-protrusions appeared on the cathode surface. Some of them had a diameter larger than 20 µm. They would be caused by adhesion of metallic particles from anode and remained through the conditioning process. On the other hand, few micro-protrusions were found on the cathodes with 100 and 300 times voltage applications. This means that the micro-protrusions were generated at the last period of the conditioning process. In other words, the generation of micro-protrusions can be a dominant factor of suppression and saturation of conditioning effect.
{"title":"Suppression of Conditioning Effect in Vacuum by Micro-protrusions from Anode","authors":"Fuminori Kondo, H. Kojima, H. Fukuda, M. Sakaki, N. Hayakawa","doi":"10.1109/ICEPE-ST.2019.8928772","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928772","url":null,"abstract":"Spark conditioning is an effective method to improve electrical insulation strength of vacuum circuit breakers. We discuss the spark conditioning process in consideration of the generation of micro-protrusions on cathode surface by breakdown. We conducted the spark conditioning on three pairs of rod-plane electrodes made of OFHC Cu. For one pair, the voltages were applied until conditioning saturation, namely 600 times voltage applications. For the others, a smaller number of voltage applications (100 times and 300 times) before conditioning saturation were given. After these conditioning experiments, we observed the surface of rod cathodes with a microscope. After the conditioning by about 600 times voltage applications, many micro-protrusions appeared on the cathode surface. Some of them had a diameter larger than 20 µm. They would be caused by adhesion of metallic particles from anode and remained through the conditioning process. On the other hand, few micro-protrusions were found on the cathodes with 100 and 300 times voltage applications. This means that the micro-protrusions were generated at the last period of the conditioning process. In other words, the generation of micro-protrusions can be a dominant factor of suppression and saturation of conditioning effect.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129706026","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928703
M. Terada, Yuki Nakai, H. Hashimoto, Daisuke Ebisawa, H. Urai, Y. Yokomizu
This paper presents the design of a dual motion mechanism for a high-voltage gas circuit breaker to give good capacitive current switching (CCS) when high voltage is applied during the half cycle from contact separation. The dual motion system drives two electrodes in opposite directions from one other, which reduces the operating energy because of shortening the movable-side stroke. To achieve high CCS performance with a lower operating energy, a fixed-side arc electrode requires quick operation in the CCS period with a short stroke. A driven-side stroke expressed with an arbitrarily shaped speed curve is proposed to increase the withstand voltage during the period for CCS and decrease the load acting on the dual motion mechanism. The dual motion mechanism is composed of two arbitrary-shaped grooved cams that cross each other. A pin positioned at the intersection point of the grooved cams rotates a lever linked to both electrodes while changing the lever ratio that shortens the path length of the pin movement. A dual motion mechanism having the optimal shape was manufactured, and the stroke curve was measured. The measured stroke curve was in good agreement with the ideal stroke characteristics.
{"title":"Design of Dual Motion Mechanism Moving along Optimized Stroke Curve to Improve Capacitive Current Switching Performance for Gas Circuit Breaker","authors":"M. Terada, Yuki Nakai, H. Hashimoto, Daisuke Ebisawa, H. Urai, Y. Yokomizu","doi":"10.1109/ICEPE-ST.2019.8928703","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928703","url":null,"abstract":"This paper presents the design of a dual motion mechanism for a high-voltage gas circuit breaker to give good capacitive current switching (CCS) when high voltage is applied during the half cycle from contact separation. The dual motion system drives two electrodes in opposite directions from one other, which reduces the operating energy because of shortening the movable-side stroke. To achieve high CCS performance with a lower operating energy, a fixed-side arc electrode requires quick operation in the CCS period with a short stroke. A driven-side stroke expressed with an arbitrarily shaped speed curve is proposed to increase the withstand voltage during the period for CCS and decrease the load acting on the dual motion mechanism. The dual motion mechanism is composed of two arbitrary-shaped grooved cams that cross each other. A pin positioned at the intersection point of the grooved cams rotates a lever linked to both electrodes while changing the lever ratio that shortens the path length of the pin movement. A dual motion mechanism having the optimal shape was manufactured, and the stroke curve was measured. The measured stroke curve was in good agreement with the ideal stroke characteristics.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129891471","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}
During the breaking process of the self-blasting circuit breaker, the pressure characteristics greatly affect the action characteristics of the valve and the pressure in the expansion chamber, thus affecting the arc blowing effect. Therefore, a 550kV single-break selfblasting circuit breaker is taken as the research object. Based on the theory of magnetohydrodynamics (MHD), a two-dimensional transient model considering arc radiation is established, and the numerical calculation of the breaking process under two typical breaking conditions with short- circuit current of 63kA and 40kA and arcing time of 12ms is completed. The pressure and temperature distribution in the expansion chamber, and the action characteristics of the valve are obtained. Besides, combined with the test conditions, the 63kA short-circuit current, the pressure and temperature characteristics under short, medium and long arcing conditions are studied, and the valve action time under different conditions is obtained. The results show that the maximum temperature of the arc core region is 33219K at 63kA, which is about 3332K higher than the 40kA condition. The maximum pressure in the expansion chamber is 2.94MPa under the condition of 63kA and 2.36MPa at 40kA. The check valve is mainly affected by the temperature and pressure in expansion chamber side under the two breaking conditions, and the force received on the side of the cylinder is substantially same. The action time of the check valve under 63kA is 0.06ms earlier than the 40kA, and relief valve advance acts 0.05ms. Corresponding to different arcing time, the action time of check valve is 16.38ms, 16.28ms and 16.48ms and the time of relief valve is 17.52ms, 17.42ms and 17.67ms.
{"title":"Research on the Pressure Characteristics of 550kV Single-Break Self-Blasting Circuit Breaker during the Breaking Process","authors":"Ruisong Li, Xin Lin, Yu Song, Jianyuan Xu, Yalong Xia, Zhenxin Geng","doi":"10.1109/ICEPE-ST.2019.8928905","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928905","url":null,"abstract":"During the breaking process of the self-blasting circuit breaker, the pressure characteristics greatly affect the action characteristics of the valve and the pressure in the expansion chamber, thus affecting the arc blowing effect. Therefore, a 550kV single-break selfblasting circuit breaker is taken as the research object. Based on the theory of magnetohydrodynamics (MHD), a two-dimensional transient model considering arc radiation is established, and the numerical calculation of the breaking process under two typical breaking conditions with short- circuit current of 63kA and 40kA and arcing time of 12ms is completed. The pressure and temperature distribution in the expansion chamber, and the action characteristics of the valve are obtained. Besides, combined with the test conditions, the 63kA short-circuit current, the pressure and temperature characteristics under short, medium and long arcing conditions are studied, and the valve action time under different conditions is obtained. The results show that the maximum temperature of the arc core region is 33219K at 63kA, which is about 3332K higher than the 40kA condition. The maximum pressure in the expansion chamber is 2.94MPa under the condition of 63kA and 2.36MPa at 40kA. The check valve is mainly affected by the temperature and pressure in expansion chamber side under the two breaking conditions, and the force received on the side of the cylinder is substantially same. The action time of the check valve under 63kA is 0.06ms earlier than the 40kA, and relief valve advance acts 0.05ms. Corresponding to different arcing time, the action time of check valve is 16.38ms, 16.28ms and 16.48ms and the time of relief valve is 17.52ms, 17.42ms and 17.67ms.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129329694","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928884
Amer Smajkic, S. Delić, Dejan Beslija, Kyong-Hoe Kim, M. Kapetanović
The breakdown voltage during interruption of capacitive currents is defined by two physical quantities: the electric field and the gas density field, which are calculated in different calculation domains and using different mashes. In order to calculate the breakdown voltage, it is necessary to map these two mashes and calculate the ratio density/electric field in every calculation point. The straightforward solution is to pair each density cell with the nearest cell from the electric field mesh, based on their coordinates. Although this solution gives good results, it is very time consuming. Therefore, this paper presents a new approach for mapping of two meshes based on the algebra of fractal vector, so called Bosnian algebra. This approach does not search the meshes for the closest pair based on the coordinates of each point, but instead uses only the assigned cell indexes and simple fractal operations to determine the neighboring cells. This way, the search for the nearest pair is much more efficient and faster.
{"title":"Algebra of Fractal Vector as a Tool for Mapping Two Different Mashes","authors":"Amer Smajkic, S. Delić, Dejan Beslija, Kyong-Hoe Kim, M. Kapetanović","doi":"10.1109/ICEPE-ST.2019.8928884","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928884","url":null,"abstract":"The breakdown voltage during interruption of capacitive currents is defined by two physical quantities: the electric field and the gas density field, which are calculated in different calculation domains and using different mashes. In order to calculate the breakdown voltage, it is necessary to map these two mashes and calculate the ratio density/electric field in every calculation point. The straightforward solution is to pair each density cell with the nearest cell from the electric field mesh, based on their coordinates. Although this solution gives good results, it is very time consuming. Therefore, this paper presents a new approach for mapping of two meshes based on the algebra of fractal vector, so called Bosnian algebra. This approach does not search the meshes for the closest pair based on the coordinates of each point, but instead uses only the assigned cell indexes and simple fractal operations to determine the neighboring cells. This way, the search for the nearest pair is much more efficient and faster.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122353907","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 : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928888
T. Schultz, Patrik Herzog, C. Franck
HVDC circuit breakers are a key technology for the reliable and safe operation of multiterminal HVDC networks. Current injection topologies can perform this duty while offering advantages like low on-state losses and a robust and economical structure. The key component for its performance is the mechanical interrupter.In this paper, four improved injection circuits are proposed. These are designed to influence the injection current shape to facilitate interruption and reduce component cost. Based on a simulation study using synthetic fault cases, interruption performance and component use of the improved injection circuits are compared to a reference CI topology. The results promise that the same performance can be achieved with considerably scaled down components.
{"title":"Current Injection Circuit Breakers for HVDC: Overview on Improved Injection Circuits","authors":"T. Schultz, Patrik Herzog, C. Franck","doi":"10.1109/ICEPE-ST.2019.8928888","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928888","url":null,"abstract":"HVDC circuit breakers are a key technology for the reliable and safe operation of multiterminal HVDC networks. Current injection topologies can perform this duty while offering advantages like low on-state losses and a robust and economical structure. The key component for its performance is the mechanical interrupter.In this paper, four improved injection circuits are proposed. These are designed to influence the injection current shape to facilitate interruption and reduce component cost. Based on a simulation study using synthetic fault cases, interruption performance and component use of the improved injection circuits are compared to a reference CI topology. The results promise that the same performance can be achieved with considerably scaled down components.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121306043","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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