Pub Date : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928890
Fanglin Chen, X. Pan, H. Zeng, Yongmin Chen, Yi Wu, Yife Wu, Yi Jiang
The DC circuit breaker is the key equipment in the DC power transmission and distribution system. IGCT devices have important application prospects in DC breaking, providing the advantages of large surge current capability and low current conduction losses. Aiming at the on-off electrical characteristics of IGCT, this paper provides the optimized design method for improving the current turn-off capability and reducing the on-state voltage drop of IGCT, in which the GCT longitudinal optimization structure for DC breaking conditions is obtained. Meanwhile, for IGCT compact modular application, the gate unit (GU) is miniaturized and isolated, and GU can be replaced without decompression. Moreover, the GU power supply, series-parallel application and control protection technology optimization are carried out for the practical application requirements. Finally, the validity and feasibility of proposed method are verified by simulation and module test.
{"title":"Study on Performance Optimization of IGCT Device for DC Circuit Breaker","authors":"Fanglin Chen, X. Pan, H. Zeng, Yongmin Chen, Yi Wu, Yife Wu, Yi Jiang","doi":"10.1109/ICEPE-ST.2019.8928890","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928890","url":null,"abstract":"The DC circuit breaker is the key equipment in the DC power transmission and distribution system. IGCT devices have important application prospects in DC breaking, providing the advantages of large surge current capability and low current conduction losses. Aiming at the on-off electrical characteristics of IGCT, this paper provides the optimized design method for improving the current turn-off capability and reducing the on-state voltage drop of IGCT, in which the GCT longitudinal optimization structure for DC breaking conditions is obtained. Meanwhile, for IGCT compact modular application, the gate unit (GU) is miniaturized and isolated, and GU can be replaced without decompression. Moreover, the GU power supply, series-parallel application and control protection technology optimization are carried out for the practical application requirements. Finally, the validity and feasibility of proposed method are verified by simulation and module test.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"62 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":"124739640","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.2019.8928709
Jianying Zhong, S. Pang, Yanwei Nan, Haonan Sun, Wenkui Liu
Due to its environment-friendless and excellent insulation performance, C4F7N and its mixtures with CO2 have received extensive attention as SF6 substitute gas in recent years. However, the experimental test on arc distinguish performance of C4F7N and its mixtures is quite expensive and time consuming. Therefore, it is very important to investigate the arc plasma behavior in C4F7N and to make a comparation with arc plasma in SF6 by means of simulation. In this thesis, a 2D axial symmetry nozzle model based on the magneto-hydrodynamics theory has been built and calculated. The basic arc parameters are described by the coupled equations of fluid field and electromagnetic field. The temperature distribution of arc plasma in C4F7N, CO2 and SF6 has been calculated. The C4F7N arc has a similar arc radius to SF6 arc in steady state. And the turbulence effect may need to be consider in the C4F7N arc simulation.
{"title":"Simulation and Comparison of Arc Characteristics in C4F7N,CO2 and SF6","authors":"Jianying Zhong, S. Pang, Yanwei Nan, Haonan Sun, Wenkui Liu","doi":"10.1109/ICEPE-ST.2019.8928709","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928709","url":null,"abstract":"Due to its environment-friendless and excellent insulation performance, C<inf>4</inf>F<inf>7</inf>N and its mixtures with CO<inf>2</inf> have received extensive attention as SF<inf>6</inf> substitute gas in recent years. However, the experimental test on arc distinguish performance of C<inf>4</inf>F<inf>7</inf>N and its mixtures is quite expensive and time consuming. Therefore, it is very important to investigate the arc plasma behavior in C<inf>4</inf>F<inf>7</inf>N and to make a comparation with arc plasma in SF<inf>6</inf> by means of simulation. In this thesis, a 2D axial symmetry nozzle model based on the magneto-hydrodynamics theory has been built and calculated. The basic arc parameters are described by the coupled equations of fluid field and electromagnetic field. The temperature distribution of arc plasma in C<inf>4</inf>F<inf>7</inf>N, CO<inf>2</inf> and SF<inf>6</inf> has been calculated. The C<inf>4</inf>F<inf>7</inf>N arc has a similar arc radius to SF<inf>6</inf> arc in steady state. And the turbulence effect may need to be consider in the C<inf>4</inf>F<inf>7</inf>N arc simulation.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"47 5 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":"125025037","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.2019.8928714
Yufei Cui, Yi Wu, M. Rong, Haodong Chang, Weiping Guan
an in-situ diagnostic system with respect to the determination of the surface temperature and the splashing erosion quantities was established. Comparative study on the transition phenomenon of the erosion mode of W70Cu30 anode was carried out in Ar and H2. Two erosion modes were identified, namely an evaporation-dominated mode and a splash-dominated mode. The results indicate that the detachment of the splashing droplet is driven by the explosion of surface bubbles. Moreover, it is found that the discrepancy in the melting and boiling points of the copper phase and the tungsten skeleton limits the anode surface temperature at first, but promotes the molten ejections through the bubble burst which originates from the copper vapor, when the copper layer above the tungsten skeleton is depleted. These characteristics control the formation of molten pool on the W70Cu30 anode, and lead to the transition of two erosion modes.
{"title":"Comparative Study on the Erosion Mechanism of W70Cu30 Anode in DC Gaseous Arcs","authors":"Yufei Cui, Yi Wu, M. Rong, Haodong Chang, Weiping Guan","doi":"10.1109/ICEPE-ST.2019.8928714","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928714","url":null,"abstract":"an in-situ diagnostic system with respect to the determination of the surface temperature and the splashing erosion quantities was established. Comparative study on the transition phenomenon of the erosion mode of W70Cu30 anode was carried out in Ar and H2. Two erosion modes were identified, namely an evaporation-dominated mode and a splash-dominated mode. The results indicate that the detachment of the splashing droplet is driven by the explosion of surface bubbles. Moreover, it is found that the discrepancy in the melting and boiling points of the copper phase and the tungsten skeleton limits the anode surface temperature at first, but promotes the molten ejections through the bubble burst which originates from the copper vapor, when the copper layer above the tungsten skeleton is depleted. These characteristics control the formation of molten pool on the W70Cu30 anode, and lead to the transition of two erosion modes.","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":"126009869","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.2019.8928829
Q. Yi, Fei Yang, Yife Wu, Wentao Liu, Yi Wu, M. Rong, S. Bai
Hybrid DC circuit breakers (HDCCB) based on high-power full-control semiconductor devices have attracted extensive attention and research for their large current conduction and fast current breaking capability. The IGCT device possesses a strong surge current withstand capability and low on-state voltage drop, making it a promising full-controlled semiconductor candidate. To meet the requirements of the increasing DC power capacity, the current turn-off capability of DC circuit breakers must be improved, this paper studies the power electronic switch based on parallel IGCT devices. Firstly, the modular IGCT component circuit topology which is easy to be series connected is proposed, and the mechanism analysis of the parallel current distribution imbalance is carried out. The single-stage laboratory prototype is built up to study the switch on-off characteristics. To promote the parallel current distribution effect, an asynchronous control method is proposed, and the control effects of different time differences are studied. Finally, the validity and feasibility of the differential control are verified by experiments.
{"title":"Asynchronous Control Method of Parallel IGCT Components in Hybrid DC Circuit Breakers","authors":"Q. Yi, Fei Yang, Yife Wu, Wentao Liu, Yi Wu, M. Rong, S. Bai","doi":"10.1109/ICEPE-ST.2019.8928829","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928829","url":null,"abstract":"Hybrid DC circuit breakers (HDCCB) based on high-power full-control semiconductor devices have attracted extensive attention and research for their large current conduction and fast current breaking capability. The IGCT device possesses a strong surge current withstand capability and low on-state voltage drop, making it a promising full-controlled semiconductor candidate. To meet the requirements of the increasing DC power capacity, the current turn-off capability of DC circuit breakers must be improved, this paper studies the power electronic switch based on parallel IGCT devices. Firstly, the modular IGCT component circuit topology which is easy to be series connected is proposed, and the mechanism analysis of the parallel current distribution imbalance is carried out. The single-stage laboratory prototype is built up to study the switch on-off characteristics. To promote the parallel current distribution effect, an asynchronous control method is proposed, and the control effects of different time differences are studied. Finally, the validity and feasibility of the differential control are verified by experiments.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"71 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":"129315258","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.2019.8928759
Liqiong Sun, Yuecheng Li, Jiankun Liu, Yi Li, Zhenxing Wang, Jianhua Wang, Yingsan Geng, Zhiyuan Liu
Vacuum arc cathode spots are centers of metal vapor evaporation, electron emission and plasma production. Arc properties are dominated by the behavior of the cathode spots. A systematic investigation on the density of copper metal vapor emitted from a single cathode spot is benefit for understanding the mechanism of vacuum arc discharge. The objective of this paper is to get the spatial density distribution of copper neutral atoms emitted from a single cathode spot in ~55A vacuum arc by planar Laser Induced Fluorescence (LIF) method. The experiments are conducted with CuCr10 (Cr weight of 10%) butt contacts in a demountable vacuum chamber. 2D distribution of copper metal vapor density is photographed by an intensified CCD cameral (i-CCD) with an exposure time of 50 ns. The uniform constant Axial Magnetic Field (AMF) within the inter-contacts region is supplied by Helmholtz coils. 2D copper vapor density distribution between two electrodes as well as the influence of external AMF on vapor density distribution are investigated. When the arc current is ~55 A, a typical cathode spot or two spots are observed in the experiments. Copper vapor density reaches the maximum value 6×1019 m-3 in the center of cathode spot.
{"title":"Two-Dimensional Observation of Single Cathode Spot Copper Vapor in Vacuum Arcs by Laser-Induced Fluorescence","authors":"Liqiong Sun, Yuecheng Li, Jiankun Liu, Yi Li, Zhenxing Wang, Jianhua Wang, Yingsan Geng, Zhiyuan Liu","doi":"10.1109/ICEPE-ST.2019.8928759","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928759","url":null,"abstract":"Vacuum arc cathode spots are centers of metal vapor evaporation, electron emission and plasma production. Arc properties are dominated by the behavior of the cathode spots. A systematic investigation on the density of copper metal vapor emitted from a single cathode spot is benefit for understanding the mechanism of vacuum arc discharge. The objective of this paper is to get the spatial density distribution of copper neutral atoms emitted from a single cathode spot in ~55A vacuum arc by planar Laser Induced Fluorescence (LIF) method. The experiments are conducted with CuCr10 (Cr weight of 10%) butt contacts in a demountable vacuum chamber. 2D distribution of copper metal vapor density is photographed by an intensified CCD cameral (i-CCD) with an exposure time of 50 ns. The uniform constant Axial Magnetic Field (AMF) within the inter-contacts region is supplied by Helmholtz coils. 2D copper vapor density distribution between two electrodes as well as the influence of external AMF on vapor density distribution are investigated. When the arc current is ~55 A, a typical cathode spot or two spots are observed in the experiments. Copper vapor density reaches the maximum value 6×1019 m-3 in the center of cathode spot.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"13 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":"130872203","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}
When a vacuum interrupter (VI) is used in a high pressure of insulating gas with a high opening velocity, a high electrical insulation level can be achieved. However, it will increase the risk of the bellows fatigue failure after a number of mechanical operations. Through empirical formulas and simulation calculation, one can get the stress and mechanical endurance of the vacuum interrupter bellows, however, there is no experiments revealing the mechanical endurance of the bellows when it is subjected to high gas pressure and high opening velocity. The objective of this paper is to experimentally determine the mechanical endurance of the VI bellows subjected to high gas pressure and high opening velocity. A 40.5 kV electromagnetic repulsion actuator is used to drive a bellows component to achieve a high velocity, and a semi-sealed tank is used as the gas pressure regulating unit. Two cases were experimentally investigated, in which the inner surface and the outer surface of the bellows suffered the high gas pressure, respectively. In the first case, the gas pressure subjected to the inner surface was 0.5MPa, and that of the outer surface was 0.1 MPa, respectively, the opening velocity was 2.8 m/s. In the second case, the gas pressure subjected to the inner surface was 0.1MPa, and that of the outer surface was 0.6 MPa, respectively. The opening velocity was 3.5 m/s, 5 m/s and 6.5 m/s, respectively. The experiments results showed that the mechanical endurance of the first case was 1410 cycles. The mechanical endurance of the second case was 705, 437, and 288 cycles when the opening velocity was 3.5, 5 and 6.5 m/s, respectively.
{"title":"Experimental Study on the Mechanical Endurance of Vacuum Interrupter Bellows Subjected to High Gas Pressure and High Opening Velocity","authors":"Xue Liu, L. Hong, X. Yao, Liqiong Sun, Zhiyuan Liu, Jianhua Wang, Yingsan Geng","doi":"10.1109/ICEPE-ST.2019.8928885","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928885","url":null,"abstract":"When a vacuum interrupter (VI) is used in a high pressure of insulating gas with a high opening velocity, a high electrical insulation level can be achieved. However, it will increase the risk of the bellows fatigue failure after a number of mechanical operations. Through empirical formulas and simulation calculation, one can get the stress and mechanical endurance of the vacuum interrupter bellows, however, there is no experiments revealing the mechanical endurance of the bellows when it is subjected to high gas pressure and high opening velocity. The objective of this paper is to experimentally determine the mechanical endurance of the VI bellows subjected to high gas pressure and high opening velocity. A 40.5 kV electromagnetic repulsion actuator is used to drive a bellows component to achieve a high velocity, and a semi-sealed tank is used as the gas pressure regulating unit. Two cases were experimentally investigated, in which the inner surface and the outer surface of the bellows suffered the high gas pressure, respectively. In the first case, the gas pressure subjected to the inner surface was 0.5MPa, and that of the outer surface was 0.1 MPa, respectively, the opening velocity was 2.8 m/s. In the second case, the gas pressure subjected to the inner surface was 0.1MPa, and that of the outer surface was 0.6 MPa, respectively. The opening velocity was 3.5 m/s, 5 m/s and 6.5 m/s, respectively. The experiments results showed that the mechanical endurance of the first case was 1410 cycles. The mechanical endurance of the second case was 705, 437, and 288 cycles when the opening velocity was 3.5, 5 and 6.5 m/s, respectively.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"33 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":"126927224","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}
With the development of DC grid technology, the application of hybrid DC switches is more and more extensive, and the reliability and life requirements of hybrid DC contactors are also increasing. As the core unit of hybrid DC contactor, mechanical switch is optimized to improve the reliability and life of the switch. In this paper, based on the 6 Sigma design method, the optimization design of the monostable permanent magnet mechanism is studied. The structural parameters were optimized with the closing force as the objective function, and the significant factors and non-significant factors were analyzed. The best factor level combination was selected to reduce the fluctuation of quality characteristics to improve the reliability of the switch and make the tolerance design reach the level of 6 Sigma. This method combines parameter optimization with reliability design and has great practical value. Finally, the experimental platform was built to verify the mechanical characteristics of the mechanical switch prototype. The experimental results verified that the opening and closing characteristics meet the design requirements.
{"title":"Optimization Design of Permanent Magnet Mechanism Based on 6 Sigma Design Method","authors":"Hao Qin, Guogang Zhang, Lu Qi, Yakui Liu, Jianhua Wang, Yingsan Geng","doi":"10.1109/ICEPE-ST.2019.8928739","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928739","url":null,"abstract":"With the development of DC grid technology, the application of hybrid DC switches is more and more extensive, and the reliability and life requirements of hybrid DC contactors are also increasing. As the core unit of hybrid DC contactor, mechanical switch is optimized to improve the reliability and life of the switch. In this paper, based on the 6 Sigma design method, the optimization design of the monostable permanent magnet mechanism is studied. The structural parameters were optimized with the closing force as the objective function, and the significant factors and non-significant factors were analyzed. The best factor level combination was selected to reduce the fluctuation of quality characteristics to improve the reliability of the switch and make the tolerance design reach the level of 6 Sigma. This method combines parameter optimization with reliability design and has great practical value. Finally, the experimental platform was built to verify the mechanical characteristics of the mechanical switch prototype. The experimental results verified that the opening and closing characteristics meet the design requirements.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"11 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":"125443035","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.2019.8928804
Haonan Sun, H. Joo, Yi Wu, M. Rong, C. Bae, Young-geun Kim
During the interruption, the separation of the contacts plays an important role in different kinds of switch gears since the arc motion or the arc elongation will be affected. The movement of the contact could increase the arc length and then decide the arc behavior. In reverse, the arc current will be changed during the interruption and the Lorentz force will then influence the movement of the contact. It is necessary to consider this phenomenon to make the arc simulation more accurate and universal. In this work, low voltage arc plasma simulation in 3D with contact opening process has been established. Both the sheath and nonlinear magnetic material were taken into consideration. Calculation was based on magneto-hydrodynamic arc model, and a method of coupling different software to separately calculate fluid and electromagnetic field has been developed to fulfill the requirements above. Furthermore, a low voltage circuit breaker has been tested to validate the simulation with U-I characteristics.
{"title":"Calculation of the Switch Arc in Low Voltage Circuit Breaker Considering the Interaction Between the Contact Movement and the Arc Force","authors":"Haonan Sun, H. Joo, Yi Wu, M. Rong, C. Bae, Young-geun Kim","doi":"10.1109/ICEPE-ST.2019.8928804","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928804","url":null,"abstract":"During the interruption, the separation of the contacts plays an important role in different kinds of switch gears since the arc motion or the arc elongation will be affected. The movement of the contact could increase the arc length and then decide the arc behavior. In reverse, the arc current will be changed during the interruption and the Lorentz force will then influence the movement of the contact. It is necessary to consider this phenomenon to make the arc simulation more accurate and universal. In this work, low voltage arc plasma simulation in 3D with contact opening process has been established. Both the sheath and nonlinear magnetic material were taken into consideration. Calculation was based on magneto-hydrodynamic arc model, and a method of coupling different software to separately calculate fluid and electromagnetic field has been developed to fulfill the requirements above. Furthermore, a low voltage circuit breaker has been tested to validate the simulation with U-I characteristics.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"283 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":"132569553","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.2019.8928853
Ryul Hwang, I. Choi, Jae-Hong Koo, Yumi Kim, Bang-wook Lee
Sulfur hexafluoride (SF6), a greenhouse gas, is used as an insulating medium for power equipment due to its excellent insulating properties. However, as global warming and climate change become a global concern, the development of products that minimize the environmental impact is increasing, and SF6 replacement gas is being studied as an environmentally friendly alternative. Currently, there are N2, CO2, and fluorine mixed gas as substitute gas of SF6 in medium voltage classes, and research on insulation characteristic for substitute gas is actively proceeding. In this paper, we present the results of a comparative study of breakdown voltage of C5F10O/CO2 and SF6 gases under lightning impulse voltage in a sphere-to-plate electrodes arrangement. The equivalencies between breakdown voltage of SF6 and those of SF6 replacement gases with respect to pressure and percentage of SF6 and C5F10O/CO2 are presented and discussed.
{"title":"SF6 Alternative Gas Lightning Impulse Insulation Breakdown Characteristic in Medium Voltage","authors":"Ryul Hwang, I. Choi, Jae-Hong Koo, Yumi Kim, Bang-wook Lee","doi":"10.1109/ICEPE-ST.2019.8928853","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928853","url":null,"abstract":"Sulfur hexafluoride (SF6), a greenhouse gas, is used as an insulating medium for power equipment due to its excellent insulating properties. However, as global warming and climate change become a global concern, the development of products that minimize the environmental impact is increasing, and SF6 replacement gas is being studied as an environmentally friendly alternative. Currently, there are N<inf>2</inf>, CO<inf>2</inf>, and fluorine mixed gas as substitute gas of SF<inf>6</inf> in medium voltage classes, and research on insulation characteristic for substitute gas is actively proceeding. In this paper, we present the results of a comparative study of breakdown voltage of C<inf>5</inf>F<inf>10</inf>O/CO<inf>2</inf> and SF<inf>6</inf> gases under lightning impulse voltage in a sphere-to-plate electrodes arrangement. The equivalencies between breakdown voltage of SF6 and those of SF6 replacement gases with respect to pressure and percentage of SF<inf>6</inf> and C<inf>5</inf>F<inf>10</inf>O/CO<inf>2</inf> are presented and discussed.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"32 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":"132098849","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.2019.8928869
Yifan Fu, M. Liao, Hao Zhang, Huaqing Dong, Xiaoli Zhang, Lu Jiang
Previous researches show that synchronous magnetic field applied in arcing time can influence the dynamic voltage distribution (DVD). However, there is a few study on the non-synchronous magnetic field control of multi-break vacuum circuit breakers (VCBs). In order to find a better method to control the non-synchronous magnetic field of multi-break VCBs in series, the Helmholtz coil was designed to generate stable magnetic field. The magnetic field distribution of the coil was simulated and analyzed in Maxwell to verify feasibility. To realize doublebreak non-synchronous control, the double-break nonsynchronous magnetic field control system was designed. The external magnetic field (EMF) experiment platform for double-break VCBs was set up. In the experiment, the applied moment and strength of EMF on each break can be adjusted by the non-synchronous magnetic field control system. By comparing the results of DVD under 7 different combinations of applied moment or strength, the effects and influence mechanism of different EMF applied to two breaks on DVD were obtained. The results of this study provide references for the design of series vacuum arc extinguishing chamber and the magnetic field control of multi-break VCBs.
{"title":"Investigation on the Influence of Non-Synchronous Magnetic Field Control on the Dynamic Voltage Distribution of Vacuum Circuit Breakers in Series","authors":"Yifan Fu, M. Liao, Hao Zhang, Huaqing Dong, Xiaoli Zhang, Lu Jiang","doi":"10.1109/ICEPE-ST.2019.8928869","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928869","url":null,"abstract":"Previous researches show that synchronous magnetic field applied in arcing time can influence the dynamic voltage distribution (DVD). However, there is a few study on the non-synchronous magnetic field control of multi-break vacuum circuit breakers (VCBs). In order to find a better method to control the non-synchronous magnetic field of multi-break VCBs in series, the Helmholtz coil was designed to generate stable magnetic field. The magnetic field distribution of the coil was simulated and analyzed in Maxwell to verify feasibility. To realize doublebreak non-synchronous control, the double-break nonsynchronous magnetic field control system was designed. The external magnetic field (EMF) experiment platform for double-break VCBs was set up. In the experiment, the applied moment and strength of EMF on each break can be adjusted by the non-synchronous magnetic field control system. By comparing the results of DVD under 7 different combinations of applied moment or strength, the effects and influence mechanism of different EMF applied to two breaks on DVD were obtained. The results of this study provide references for the design of series vacuum arc extinguishing chamber and the magnetic field control of multi-break VCBs.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"74 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":"132241431","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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