The switching surges of a cable collector system can cause equipment failure in a wind power plant (WPP). The study on the switching over-voltage caused by operation of medium voltage breaker in the cable collector system is important. In this paper, a laboratory test system was set up to reproduce a part of a cable collector system in a WPP. Based on the way the load was connected to the cable collector, four test approaches were proposed to measure the switching over-voltage. A vacuum circuit breaker (VCB) with point on wave control was used in the circuit to study the effect of current chopping characteristics while breaking the inductive load. These switching tests were conducted to simulate the possible switching operations in a WPP. The test results have shown that the over-voltages caused in a cable system are closely related to the cable length and inductive load. The maximum over-voltage was observed during the breaking of the inductive load at zero phase voltage in which multi re-ignitions of the VCB were recorded.
{"title":"Study on switching transients of cable collector system in wind power plant","authors":"Xianzong Wang, Xuezhong Liu, Yishan Li, Abdul Saboor, Junshuai Cao, Yuchen Shang","doi":"10.1109/ICEPE-ST.2011.6122995","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6122995","url":null,"abstract":"The switching surges of a cable collector system can cause equipment failure in a wind power plant (WPP). The study on the switching over-voltage caused by operation of medium voltage breaker in the cable collector system is important. In this paper, a laboratory test system was set up to reproduce a part of a cable collector system in a WPP. Based on the way the load was connected to the cable collector, four test approaches were proposed to measure the switching over-voltage. A vacuum circuit breaker (VCB) with point on wave control was used in the circuit to study the effect of current chopping characteristics while breaking the inductive load. These switching tests were conducted to simulate the possible switching operations in a WPP. The test results have shown that the over-voltages caused in a cable system are closely related to the cable length and inductive load. The maximum over-voltage was observed during the breaking of the inductive load at zero phase voltage in which multi re-ignitions of the VCB were recorded.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114691012","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6123032
Junmin Zhang, Chao Gao, Hao Feng, Guang-chao Yan, F. Zhao, D. Yuan, Hongchao Zhao
In the design process of switch cabinet, the heat dissipation of current-carrying loop is one of the key problems. By introducing the heat conduction differential equation, Navier-Stokes equations and radiation heat transfer equation, the multi-physical field coupled mathematical models are established for researching the heat dissipation problem in the switch cabinet in this paper. The mathematical models and the finite volume method are presented to compute the three-dimensional thermal and fluid fields of KYN28A-12 switch cabinet. And wall function method is used to deal with convection heat transfer boundary conditions. Then the hexahedral finite element mesh method is used in the numerical calculation. The thermal and fluid fields are calculated respectively in two different conditions, natural convection and forced convection. Compared with natural convection, the temperature in the forced convection is obviously lower. The heat dissipation of the current-carrying loop is increased in the situation of forced convection.
{"title":"A coupled three-dimensional fluid-thermal fields analysis of KYN28A-12 switch cabinet","authors":"Junmin Zhang, Chao Gao, Hao Feng, Guang-chao Yan, F. Zhao, D. Yuan, Hongchao Zhao","doi":"10.1109/ICEPE-ST.2011.6123032","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6123032","url":null,"abstract":"In the design process of switch cabinet, the heat dissipation of current-carrying loop is one of the key problems. By introducing the heat conduction differential equation, Navier-Stokes equations and radiation heat transfer equation, the multi-physical field coupled mathematical models are established for researching the heat dissipation problem in the switch cabinet in this paper. The mathematical models and the finite volume method are presented to compute the three-dimensional thermal and fluid fields of KYN28A-12 switch cabinet. And wall function method is used to deal with convection heat transfer boundary conditions. Then the hexahedral finite element mesh method is used in the numerical calculation. The thermal and fluid fields are calculated respectively in two different conditions, natural convection and forced convection. Compared with natural convection, the temperature in the forced convection is obviously lower. The heat dissipation of the current-carrying loop is increased in the situation of forced convection.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114961227","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6122996
Sheng Chunhong, Zhang Kuwa, Guan Qun
With the development of the work that “constructing strong intelligent power grid”, intelligent substation system become into the main develop direction. This paper mainly takes research on the on-line monitoring technology about GIS breaker mechanical properties, partial discharge and SF6 gas pressure. By analyzing various on-line monitoring technologies and contrasting the advantages and disadvantages of them, the paper summarize the monitoring technology suitable for GIS equipment and put forward the viewpoint that the integrated design of the traditional high voltage switch equipment and intelligent elements should give first place to the primary equipment. This paper proposes the monitoring technology suitable for GIS based on keeping the primary equipment safe and reliable. The research would provide reference and basis for the subsequent development of intelligent GIS on-line monitoring system.
{"title":"Research on intelligent GIS on-line status monitoring","authors":"Sheng Chunhong, Zhang Kuwa, Guan Qun","doi":"10.1109/ICEPE-ST.2011.6122996","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6122996","url":null,"abstract":"With the development of the work that “constructing strong intelligent power grid”, intelligent substation system become into the main develop direction. This paper mainly takes research on the on-line monitoring technology about GIS breaker mechanical properties, partial discharge and SF6 gas pressure. By analyzing various on-line monitoring technologies and contrasting the advantages and disadvantages of them, the paper summarize the monitoring technology suitable for GIS equipment and put forward the viewpoint that the integrated design of the traditional high voltage switch equipment and intelligent elements should give first place to the primary equipment. This paper proposes the monitoring technology suitable for GIS based on keeping the primary equipment safe and reliable. The research would provide reference and basis for the subsequent development of intelligent GIS on-line monitoring system.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115099758","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6123062
T. Imae, Y. Kuroki, Kohei Gaja, E. Kaneko, Takehiro Hayashida, Takafumi Nishi
An insulator in a quenching chamber of a switch causes ablation, and releases gases when arcing. These released gases are known to have an influence on the arc characteristics. In this paper, experiments with the eight kinds of insulators and air will be introduced. The experiments were done by observing the arc shapes changes with digital high-speed video cameras. Furthermore, we measured arc conductance from the quenching peak to current zero by measuring arc voltage and current. The shapes of the arc were observed from two directions.
{"title":"Ablation characteristics of the different kinds of polymer insulators","authors":"T. Imae, Y. Kuroki, Kohei Gaja, E. Kaneko, Takehiro Hayashida, Takafumi Nishi","doi":"10.1109/ICEPE-ST.2011.6123062","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6123062","url":null,"abstract":"An insulator in a quenching chamber of a switch causes ablation, and releases gases when arcing. These released gases are known to have an influence on the arc characteristics. In this paper, experiments with the eight kinds of insulators and air will be introduced. The experiments were done by observing the arc shapes changes with digital high-speed video cameras. Furthermore, we measured arc conductance from the quenching peak to current zero by measuring arc voltage and current. The shapes of the arc were observed from two directions.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123602609","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6122902
Jung-Hun Kwon, Sung-Hoon Cho, K. Lim, Kil-Sou Kim
Low voltage circuit breakers are widely used in power distribution systems for rapid interruption of fault currents to assure the reliability of the power supply. While power distribution systems are demanding transformers with higher capacity than ever, there is an increase in the number of short-circuit current accidents. To prevent such accidents, molded case circuit breakers with improved short-circuit current interrupting capacity are needed.
{"title":"An influence of new arc quenching methods for improving the interrupting capacity of low voltage circuit breaker","authors":"Jung-Hun Kwon, Sung-Hoon Cho, K. Lim, Kil-Sou Kim","doi":"10.1109/ICEPE-ST.2011.6122902","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6122902","url":null,"abstract":"Low voltage circuit breakers are widely used in power distribution systems for rapid interruption of fault currents to assure the reliability of the power supply. While power distribution systems are demanding transformers with higher capacity than ever, there is an increase in the number of short-circuit current accidents. To prevent such accidents, molded case circuit breakers with improved short-circuit current interrupting capacity are needed.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124140523","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6123002
Ziqiang Wei, Jingyin Zhang, H. Hong, W. Gong, Y. Xin
This paper introduces a simulation model of Saturated Iron Core Superconducting Fault Current Limiter (SICSFCL) using SIMPOWER of MATLAB and establishes an actual model for the 35kV/90MVA SICSFCL installed in Puji substation at Kunming. The model is used to simulate the artificially imposed three-phase short-circuit and the results are compared to the live grid test results, which were carried out in July 2009. The SICSFCL simulation model is verified effectively.
{"title":"Calculation and verification of current limiting properties for Saturated Iron Core Superconductive Fault Current Limiter","authors":"Ziqiang Wei, Jingyin Zhang, H. Hong, W. Gong, Y. Xin","doi":"10.1109/ICEPE-ST.2011.6123002","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6123002","url":null,"abstract":"This paper introduces a simulation model of Saturated Iron Core Superconducting Fault Current Limiter (SICSFCL) using SIMPOWER of MATLAB and establishes an actual model for the 35kV/90MVA SICSFCL installed in Puji substation at Kunming. The model is used to simulate the artificially imposed three-phase short-circuit and the results are compared to the live grid test results, which were carried out in July 2009. The SICSFCL simulation model is verified effectively.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124409871","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6123045
Shengwen Shu, J. Ruan, Daochun Huang, Gao-bo Wu
For vacuum circuit breaker (VCB), the contact surface temperature is still high after high current arcing, evaporation of metal vapor continues with considerable rates. The metal vapor and residual charge at current zero, i.e., the arc memory which depends on arcing conditions, determines the post-arc dielectric strength recovery of VCB. Considering the well-known continuous transition model (CTM) proposed by Andrews and Varey only shows the effect of residual charge on dielectric strength during sheath expanding period, thus, a submodel including metal vapor density and breakdown criteria corresponding to Paschen limit is added to the existing CTM. Moreover, it has taken into account the charge exchange between ions and vapor atoms. Its accuracy is verified by comparing simulation result with test and the other simulation data. Then based on the improved CTM, influence of arcing conditions including arcing time t0, interrupted current amplitude ip and ramp di/dt on the post-arc dielectric strength recovery of VCB are simulated and analyzed.
{"title":"Influence of arcing conditions on post-arc dielectric strength recovery of VCB—Simulation based on an improved CTM","authors":"Shengwen Shu, J. Ruan, Daochun Huang, Gao-bo Wu","doi":"10.1109/ICEPE-ST.2011.6123045","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6123045","url":null,"abstract":"For vacuum circuit breaker (VCB), the contact surface temperature is still high after high current arcing, evaporation of metal vapor continues with considerable rates. The metal vapor and residual charge at current zero, i.e., the arc memory which depends on arcing conditions, determines the post-arc dielectric strength recovery of VCB. Considering the well-known continuous transition model (CTM) proposed by Andrews and Varey only shows the effect of residual charge on dielectric strength during sheath expanding period, thus, a submodel including metal vapor density and breakdown criteria corresponding to Paschen limit is added to the existing CTM. Moreover, it has taken into account the charge exchange between ions and vapor atoms. Its accuracy is verified by comparing simulation result with test and the other simulation data. Then based on the improved CTM, influence of arcing conditions including arcing time t0, interrupted current amplitude ip and ramp di/dt on the post-arc dielectric strength recovery of VCB are simulated and analyzed.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114959809","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6122903
Junmin Zhang, Tian Lei, G. Chao
Based on the MHD (magnetohydrodynamic) equations, a 2-D dynamic mathematical model of nozzle arc considering the nozzle ablation is established in this paper, in which the interactions of the arc, the gas flow and the electromagnetic field are emphasized. A CFD software is used to simulate the process of interrupting the symmetrical and asymmetrical short-circuit current of a high voltage SF6 self-expansion circuit breaker, respectively. The dynamic characteristics of the nozzle arc as well as the pressure characteristics in the expansion chamber in the two cases are analysed and compared, more specifically, including the temperature and the pressure of arc at the current peak and at the current zero. Therefore, the interactions and influence between the DC component of the short-circuit current and the dynamic characteristics of arc during the arcing period are analyzed. The results show that the DC component of the short-circuit current increases the energy of the arc and raises the pressure of the expansion chamber; and it increases significantly the temperature, the pressure and the radius of arc at the current peak and the current zero.
{"title":"Research on the influence of the DC component of short-circuit current on arc dynamic characteristics during the arcing period","authors":"Junmin Zhang, Tian Lei, G. Chao","doi":"10.1109/ICEPE-ST.2011.6122903","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6122903","url":null,"abstract":"Based on the MHD (magnetohydrodynamic) equations, a 2-D dynamic mathematical model of nozzle arc considering the nozzle ablation is established in this paper, in which the interactions of the arc, the gas flow and the electromagnetic field are emphasized. A CFD software is used to simulate the process of interrupting the symmetrical and asymmetrical short-circuit current of a high voltage SF6 self-expansion circuit breaker, respectively. The dynamic characteristics of the nozzle arc as well as the pressure characteristics in the expansion chamber in the two cases are analysed and compared, more specifically, including the temperature and the pressure of arc at the current peak and at the current zero. Therefore, the interactions and influence between the DC component of the short-circuit current and the dynamic characteristics of arc during the arcing period are analyzed. The results show that the DC component of the short-circuit current increases the energy of the arc and raises the pressure of the expansion chamber; and it increases significantly the temperature, the pressure and the radius of arc at the current peak and the current zero.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115810248","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 : 2011-10-01DOI: 10.1109/ICEPE-ST.2011.6123021
S. Yamasaki, T. Matsumoto, K. Oyama, H. Kato, M. Ogura, D. Takeuchi, T. Makino, S. Nishizawa, H. Oohash, H. Okushi
As widely known, diamond has a higher break-down voltage than other semiconductor materials, 30 times than silicon and 3 times than silicon-carbide. Because of its superior property, diamond has a high potential of high voltage power devices. In addition diamond has unique properties, namely transport property of heavily doped material over 1020 cm−3, high density exciton being stable even at room temperature, negative electron affinity with hydrogen terminated surface, etc. We have fabricated diamond devices using these properties, such as ultraviolet light emitting diodes, a new type of diode with high breakdown voltage and low ON resistance, high current density flow diode using heavily doped layers, and so on. In this key note lecture, we show the recent achievements of these electronic devices and discuss the potential of diamond semiconductor as a high voltage power device.
{"title":"Diamond power devices - possbility of high voltage applicatios","authors":"S. Yamasaki, T. Matsumoto, K. Oyama, H. Kato, M. Ogura, D. Takeuchi, T. Makino, S. Nishizawa, H. Oohash, H. Okushi","doi":"10.1109/ICEPE-ST.2011.6123021","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6123021","url":null,"abstract":"As widely known, diamond has a higher break-down voltage than other semiconductor materials, 30 times than silicon and 3 times than silicon-carbide. Because of its superior property, diamond has a high potential of high voltage power devices. In addition diamond has unique properties, namely transport property of heavily doped material over 1020 cm−3, high density exciton being stable even at room temperature, negative electron affinity with hydrogen terminated surface, etc. We have fabricated diamond devices using these properties, such as ultraviolet light emitting diodes, a new type of diode with high breakdown voltage and low ON resistance, high current density flow diode using heavily doped layers, and so on. In this key note lecture, we show the recent achievements of these electronic devices and discuss the potential of diamond semiconductor as a high voltage power device.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115560646","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}
In this paper, the high voltage SF6 circuit breaker (HV SF6CB) was taken as the research object, an axial vortex arc quenching chamber structure with a novel “X-type” guide blade on the nozzle upstream is presented to effectively control the kinetic energy of the free vortex formed by the gas flow and to exchange the energy in the radial direction. During the interruption, the temperature gradient along the radial direction can be generated. In the process of the internal energy exchange, because the outer spin flow of the turbulence gains more kinetic energy than the internal energy loss, which makes the total temperature of the outer rotary flow increase, and the internal gas flow temperature decrease accordingly. In this paper, the novel nozzle is proposed and applied to achieve energy separated vortex movement of the high pressure gas flow to reduce the axial temperature and increase the gas flow capability. And a 550kV SF6 CB was taken as the research object in this paper. By using finite volume method (FVM), the 3D flow field mathematical model under the small capacitive current interruption is proposed and the influence of the X type guide blade structure on flow field is simulated. By solving the gas flow field with complex flow path, supersonic nozzle, viscous, compressible and variable boundaries, the influences of different axial vortex nozzle structure on the velocity and pressure distributions have been achieved. In addition, the comparisons of gas flow distributions in the chamber with and without X type guide blade nozzle were obtained and analyzed.
{"title":"Analysis on the gas flow characteristic of high voltage SF6 circuit breaker with novel energy separated nozzle","authors":"Xiaoming Liu, Liying Li, Yundong Cao, X. Leng, Yunxue Zhao","doi":"10.1109/ICEPE-ST.2011.6123039","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2011.6123039","url":null,"abstract":"In this paper, the high voltage SF6 circuit breaker (HV SF6CB) was taken as the research object, an axial vortex arc quenching chamber structure with a novel “X-type” guide blade on the nozzle upstream is presented to effectively control the kinetic energy of the free vortex formed by the gas flow and to exchange the energy in the radial direction. During the interruption, the temperature gradient along the radial direction can be generated. In the process of the internal energy exchange, because the outer spin flow of the turbulence gains more kinetic energy than the internal energy loss, which makes the total temperature of the outer rotary flow increase, and the internal gas flow temperature decrease accordingly. In this paper, the novel nozzle is proposed and applied to achieve energy separated vortex movement of the high pressure gas flow to reduce the axial temperature and increase the gas flow capability. And a 550kV SF6 CB was taken as the research object in this paper. By using finite volume method (FVM), the 3D flow field mathematical model under the small capacitive current interruption is proposed and the influence of the X type guide blade structure on flow field is simulated. By solving the gas flow field with complex flow path, supersonic nozzle, viscous, compressible and variable boundaries, the influences of different axial vortex nozzle structure on the velocity and pressure distributions have been achieved. In addition, the comparisons of gas flow distributions in the chamber with and without X type guide blade nozzle were obtained and analyzed.","PeriodicalId":379448,"journal":{"name":"2011 1st International Conference on Electric Power Equipment - Switching Technology","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121260962","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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