Pub Date : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928665
A. Kadivar, K. Niayesh
This paper is devoted to fundamental physics and numerical simulation of arcs initiated by an exploding wire. That is primarily used to perform simplified experiments on switching arcs without having complex moving contacts or for study the switching arc under controlled conditions. One of the main issues in the accuracy of these experiments is that a certain amount of metal vapor is inserted into the arcing medium, which can affect the switching arc characteristics through affecting the thermodynamic characteristics of the gas mixture.The current study aims to address this issue by solving the magneto-hydrodynamics (MHD) equations in local thermodynamic equilibrium (LTE) for temperature and electric potential. Impact of copper vapor on arc characteristics has been considered throughout modeling thermal and electrical conductivity as well as radiation properties for metal vapor percentage in the gas mixture.Current magnitude effect on arc characteristics is studied through increasing arc current to 300 and 600 A in experimentally verified MHD model for the free-burning arc. Results of the experimental setup are utilized to support and verify this study.Effects of severely arc quenching through very narrow tubes (150 A through nozzle diameter of 2 mm) on thermal arc behavior, maximum current density inside the tube and arc voltage oscillations near current zeros are investigated through MHD simulations. The simulation results show good agreement with the experimental results except at current zeros, where the LTE conditions are not fulfilled.
{"title":"Simulation of Free Burning Arcs and Arcs Inside Cylindrical Tubes Initiated by Exploding Wires","authors":"A. Kadivar, K. Niayesh","doi":"10.1109/ICEPE-ST.2019.8928665","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928665","url":null,"abstract":"This paper is devoted to fundamental physics and numerical simulation of arcs initiated by an exploding wire. That is primarily used to perform simplified experiments on switching arcs without having complex moving contacts or for study the switching arc under controlled conditions. One of the main issues in the accuracy of these experiments is that a certain amount of metal vapor is inserted into the arcing medium, which can affect the switching arc characteristics through affecting the thermodynamic characteristics of the gas mixture.The current study aims to address this issue by solving the magneto-hydrodynamics (MHD) equations in local thermodynamic equilibrium (LTE) for temperature and electric potential. Impact of copper vapor on arc characteristics has been considered throughout modeling thermal and electrical conductivity as well as radiation properties for metal vapor percentage in the gas mixture.Current magnitude effect on arc characteristics is studied through increasing arc current to 300 and 600 A in experimentally verified MHD model for the free-burning arc. Results of the experimental setup are utilized to support and verify this study.Effects of severely arc quenching through very narrow tubes (150 A through nozzle diameter of 2 mm) on thermal arc behavior, maximum current density inside the tube and arc voltage oscillations near current zeros are investigated through MHD simulations. The simulation results show good agreement with the experimental results except at current zeros, where the LTE conditions are not fulfilled.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"48 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":"126597927","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.2019.8928700
Hailong He, Jiaze Li, Yi Wu, Peng Zhao, Lingxiao Li
The limitation of fault current in the DC system is an urgent but difficult problem. An active triggered liquid metal fault current-limiting method is proposed based on an external trigger circuit to ignite the arc in the current-through channel to realize the current limitation. Besides, the test setup as well as method is adopted to verify its limiting property of this new triggered method. It indicates that the new method can response quickly in case of a fault and ignites the arc to limit the current. Finally, the non-linear relationship between the arc properties and current density is mathematically revealed and discussed.
{"title":"Introduction of an Active Triggered Liquid Metal Fault Current-limiting Method","authors":"Hailong He, Jiaze Li, Yi Wu, Peng Zhao, Lingxiao Li","doi":"10.1109/ICEPE-ST.2019.8928700","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928700","url":null,"abstract":"The limitation of fault current in the DC system is an urgent but difficult problem. An active triggered liquid metal fault current-limiting method is proposed based on an external trigger circuit to ignite the arc in the current-through channel to realize the current limitation. Besides, the test setup as well as method is adopted to verify its limiting property of this new triggered method. It indicates that the new method can response quickly in case of a fault and ignites the arc to limit the current. Finally, the non-linear relationship between the arc properties and current density is mathematically revealed and discussed.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"518 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":"123111964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The gas spark switch, because of simple structure, wide working voltage range and huge charge quantity conversion, is widely applied to nuclear physics, electron beam accelerators, etc. However, the stability of the breakdown voltages could deteriorate due to repetitive discharging, which degrades the performance of the switch significantly. The objective of this paper is to experimentally study the influence of gas-insulating media properties and electrode surface morphologies on the breakdown stabilities. Nitrogen at pressure of 10 bar was chosen as the working gas. The experiments were conducted based on the laser scattering and laser shadow photography to detect particle generation during discharging and gas recovery after discharging. After that, Scanning Electron Microscope (SEM) technology was employed to observe the microscopic geometry. The results show the electrodes were damaged by honeycomb-like cavities, cracks and erosion protuberance, which is the consequence of particles emitting or hitting. In addition, the gas flow field was disturbed tempestuously following the current extinction and the recovery period may take tens of microseconds. When the switch worked with high repetition rates, its breakdown voltage could be reduced due to the residual flow disturbance of previous discharges. A great number of particles were generated during per pulse discharge and they could accumulate gradually to fill up the whole gap, which transform the insulating media from pure gas to mixture with abundant solid particles. All factors above may cause abnormal breakdown thus affects the stability of the gas spark switch.
{"title":"Study on Breakdown Stability of Gas Spark Switches","authors":"Wenlong Yan, Boyang Chen, Zhenxing Wang, Liqiong Sun, Zhiyuan Liu, Yingsan Geng, Jianhua Wang","doi":"10.1109/ICEPE-ST.2019.8928701","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928701","url":null,"abstract":"The gas spark switch, because of simple structure, wide working voltage range and huge charge quantity conversion, is widely applied to nuclear physics, electron beam accelerators, etc. However, the stability of the breakdown voltages could deteriorate due to repetitive discharging, which degrades the performance of the switch significantly. The objective of this paper is to experimentally study the influence of gas-insulating media properties and electrode surface morphologies on the breakdown stabilities. Nitrogen at pressure of 10 bar was chosen as the working gas. The experiments were conducted based on the laser scattering and laser shadow photography to detect particle generation during discharging and gas recovery after discharging. After that, Scanning Electron Microscope (SEM) technology was employed to observe the microscopic geometry. The results show the electrodes were damaged by honeycomb-like cavities, cracks and erosion protuberance, which is the consequence of particles emitting or hitting. In addition, the gas flow field was disturbed tempestuously following the current extinction and the recovery period may take tens of microseconds. When the switch worked with high repetition rates, its breakdown voltage could be reduced due to the residual flow disturbance of previous discharges. A great number of particles were generated during per pulse discharge and they could accumulate gradually to fill up the whole gap, which transform the insulating media from pure gas to mixture with abundant solid particles. All factors above may cause abnormal breakdown thus affects the stability of the gas spark switch.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"4 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":"117276873","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.2019.8928872
Xin Yang, Xixiu Wu, Jin Qiu, Chao Li, Bo Wen, Hui Hou, Tao Yang, Liang Huang
GIS switchgear operation is the main EMI source of the smart substation which will disturb the normal work of intelligent component and results severe electric power accident. To ensure the safety and reliability of smart GIS substation, it is quite necessary to carry out research on the EMI characteristics of GIS spatial radiation caused by disconnector operation. For this reason, a 550kV GIS experimental platform with very complex measurement system is set up and biconical antenna is applied to measure the electric filed radiation during the test. The measurement results show that: ① The amplitude of electric filed radiation is very high, which fluctuates at the range of 1.931kV/m~2.458kV/m; ② The EMI duration of DS operation last for long time, 5-7 cycle time for open operation and 3-5 cycle time for close operation respectively; ③The electric filed radiation has abundant frequency component and 1MHz,7.5MHz,14.5MHz and 46.5MHz are the characteristic frequency of it.
{"title":"Study on the Spatial Radiation EMI Characteristics of GIS Caused by Disconnector Operation","authors":"Xin Yang, Xixiu Wu, Jin Qiu, Chao Li, Bo Wen, Hui Hou, Tao Yang, Liang Huang","doi":"10.1109/ICEPE-ST.2019.8928872","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928872","url":null,"abstract":"GIS switchgear operation is the main EMI source of the smart substation which will disturb the normal work of intelligent component and results severe electric power accident. To ensure the safety and reliability of smart GIS substation, it is quite necessary to carry out research on the EMI characteristics of GIS spatial radiation caused by disconnector operation. For this reason, a 550kV GIS experimental platform with very complex measurement system is set up and biconical antenna is applied to measure the electric filed radiation during the test. The measurement results show that: ① The amplitude of electric filed radiation is very high, which fluctuates at the range of 1.931kV/m~2.458kV/m; ② The EMI duration of DS operation last for long time, 5-7 cycle time for open operation and 3-5 cycle time for close operation respectively; ③The electric filed radiation has abundant frequency component and 1MHz,7.5MHz,14.5MHz and 46.5MHz are the characteristic frequency of it.","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":"130840854","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.2019.8928693
M. Rong, Zhuo Yang, Qing Wan, Hailong He, Yi Wu, Longlong Wang
Liquid metal current limiter (LMCL) based on forced current commutation is potential to be used in MVDC power system. This LMCL utilizes fast switch (FS) and a parallel connecting path consists of several current limiting elements (CLEs) and an auxiliary magnetic induction module (MIM) in serial. The MIM consists of a pre-charged capacitor C, a thyristor T and a set of magnetic coupling coils (MCC). In this paper, a simulation model of this LMCL is built to investigate the current limiting process. And it is experimentally verified according to current commutation and limitation characteristics. Furthermore, based on this model, the current commutation characteristics are analyzed allowing for different influencing factors including the stray inductance of CLEs path and the parameters of MIM. It can be concluded that the effect of CLEs path stray inductance plays a vital role to current commutation process. Finally, the pre-arcing characteristics of CLE during current commutation process are experimental revealed. The pre-arcing duration tends to decrease with the first 100μs current rising rate (di/dt) increasing. And the arc will not ignite during current commutation when the first 100μs di/dt is 200A/μs at specific conditions.
{"title":"Investigation of Liquid Metal Current Limiter for MVDC Power System","authors":"M. Rong, Zhuo Yang, Qing Wan, Hailong He, Yi Wu, Longlong Wang","doi":"10.1109/ICEPE-ST.2019.8928693","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928693","url":null,"abstract":"Liquid metal current limiter (LMCL) based on forced current commutation is potential to be used in MVDC power system. This LMCL utilizes fast switch (FS) and a parallel connecting path consists of several current limiting elements (CLEs) and an auxiliary magnetic induction module (MIM) in serial. The MIM consists of a pre-charged capacitor C, a thyristor T and a set of magnetic coupling coils (MCC). In this paper, a simulation model of this LMCL is built to investigate the current limiting process. And it is experimentally verified according to current commutation and limitation characteristics. Furthermore, based on this model, the current commutation characteristics are analyzed allowing for different influencing factors including the stray inductance of CLEs path and the parameters of MIM. It can be concluded that the effect of CLEs path stray inductance plays a vital role to current commutation process. Finally, the pre-arcing characteristics of CLE during current commutation process are experimental revealed. The pre-arcing duration tends to decrease with the first 100μs current rising rate (di/dt) increasing. And the arc will not ignite during current commutation when the first 100μs di/dt is 200A/μs at specific conditions.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"6 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":"116948009","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.2019.8928705
Zengbin Wang, Rui Wang, Chao-Bo Yan, Lijun Wang, Ji Wu
As protective equipment of the electrical power systems, switching device is of great importance in the transmission and distribution of the power systems. Switchgear is widely used in the medium power system. Long-term excessive temperature rise will lead to reduction of insulation property and mechanical property, which may finally lead to fatal accidents. To maintain safe and stable operation of switch-gear, long-term excessive temperature rise has to be avoided. The research on the distribution of temperature in the switch-gear is of great importance for the optimum design and improvement of service life of switch-gear. Based on electromagnetic-fluid-temperature coupling, multi-physics simulations are adopted to analyze the temperature rise distribution of switch-gear. In this paper, we conducted simulations and experiments to analyze the temperature rise of a medium-voltage switchgear whose rated current is 4000A. The 3D model of the switch-gear is established in UG with 1:1 ratio. To achieve high accuracy, contact resistance at the vacuum interrupters and the tulip contact is considered in the 3D model. The simulations are conducted with ANSYS Multiphysics and CFX coupling. In the ANSYS section, the heat generated by the alternating current is obtained and later transported to CFX as energy source. In the CFX section, thermal-fluid coupling simulation is conducted and the temperature rise distribution is obtained. Using this method, the temperature rise of the switch-gear is firstly simulated and analyzed, and simulation results also are compared with the experiment result. Comparison result verified the correctness of simulation result. Secondly, a heat dissipation improvement method is put forward to reduce the temperature rise of the medium-voltage switchgear. Simulation and experiment on the modified switchgear model is conducted. By simulation and experiment, it can be found that the method is effective in reduction of the temperature rise of the switch-gear.
{"title":"Heat Dissipation Improvement of Medium-Voltage Switch-gear: Simulation Study and Experimental Validation","authors":"Zengbin Wang, Rui Wang, Chao-Bo Yan, Lijun Wang, Ji Wu","doi":"10.1109/ICEPE-ST.2019.8928705","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928705","url":null,"abstract":"As protective equipment of the electrical power systems, switching device is of great importance in the transmission and distribution of the power systems. Switchgear is widely used in the medium power system. Long-term excessive temperature rise will lead to reduction of insulation property and mechanical property, which may finally lead to fatal accidents. To maintain safe and stable operation of switch-gear, long-term excessive temperature rise has to be avoided. The research on the distribution of temperature in the switch-gear is of great importance for the optimum design and improvement of service life of switch-gear. Based on electromagnetic-fluid-temperature coupling, multi-physics simulations are adopted to analyze the temperature rise distribution of switch-gear. In this paper, we conducted simulations and experiments to analyze the temperature rise of a medium-voltage switchgear whose rated current is 4000A. The 3D model of the switch-gear is established in UG with 1:1 ratio. To achieve high accuracy, contact resistance at the vacuum interrupters and the tulip contact is considered in the 3D model. The simulations are conducted with ANSYS Multiphysics and CFX coupling. In the ANSYS section, the heat generated by the alternating current is obtained and later transported to CFX as energy source. In the CFX section, thermal-fluid coupling simulation is conducted and the temperature rise distribution is obtained. Using this method, the temperature rise of the switch-gear is firstly simulated and analyzed, and simulation results also are compared with the experiment result. Comparison result verified the correctness of simulation result. Secondly, a heat dissipation improvement method is put forward to reduce the temperature rise of the medium-voltage switchgear. Simulation and experiment on the modified switchgear model is conducted. By simulation and experiment, it can be found that the method is effective in reduction of the temperature rise of the switch-gear.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"9 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":"116961549","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.2019.8928794
Ryutaro Kusa, Issei Fujita, Y. Yamano, H. Fukuda, K. Yamamura
In a vacuum interrupter (VI), surface flashover events are one of the obstacles for improving its higher voltage performance. To suppress the vacuum flashover along the insulator surface, field relaxation rings apply to it around the connection point between the metal and alumina insulator, which is called as Triple Junction (TJ) in order to reduce the high field around the TJ point. To obtain higher voltage performance in vacuum interrupter, it is necessary to optimize the shape of field relaxation rings for example, its length, tip radius and gap length etc. In this study, we investigated the vacuum flashover voltage in model vacuum interrupter samples which were equipped with the field relaxation rings inside cylindrical alumina insulator. We carried out the flashover tests for the model samples changing the length of field relaxation rings. As a result, it was confirmed that the install of field relaxation ring increased the vacuum flashover voltage in vacuum interrupter. But in case of the short ring length, the flashover performance was inferior to that of sample having a certain length ring. On the other hand, in case of applying a long ring length, the flashover voltage also decreased rather than the certain appropriate ring length. Therefore, the design of ring length is necessary to select the appropriate length considering the field relaxation for TJ point and the tip of shield rings.
{"title":"Influence of Field Relaxation Ring Length on Vacuum Flashover Voltage in Model Sample of Vacuum Interrupter","authors":"Ryutaro Kusa, Issei Fujita, Y. Yamano, H. Fukuda, K. Yamamura","doi":"10.1109/ICEPE-ST.2019.8928794","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928794","url":null,"abstract":"In a vacuum interrupter (VI), surface flashover events are one of the obstacles for improving its higher voltage performance. To suppress the vacuum flashover along the insulator surface, field relaxation rings apply to it around the connection point between the metal and alumina insulator, which is called as Triple Junction (TJ) in order to reduce the high field around the TJ point. To obtain higher voltage performance in vacuum interrupter, it is necessary to optimize the shape of field relaxation rings for example, its length, tip radius and gap length etc. In this study, we investigated the vacuum flashover voltage in model vacuum interrupter samples which were equipped with the field relaxation rings inside cylindrical alumina insulator. We carried out the flashover tests for the model samples changing the length of field relaxation rings. As a result, it was confirmed that the install of field relaxation ring increased the vacuum flashover voltage in vacuum interrupter. But in case of the short ring length, the flashover performance was inferior to that of sample having a certain length ring. On the other hand, in case of applying a long ring length, the flashover voltage also decreased rather than the certain appropriate ring length. Therefore, the design of ring length is necessary to select the appropriate length considering the field relaxation for TJ point and the tip of shield rings.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"82 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":"114331468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The high-voltage dis-connector, as a key substation equipment in the power grid structure, is vitally important to the quality of the power grid operation. Due to the geographic location of Guangdong Province of China, many strong typhoons have caused great damage to power facilities in recent years. And the loss of the dis-connector is the most serious, which severely affects the reliability of the power supply. However, the research on the wind resistance of the dis-connector is still few, so the improvement work of the device is quite difficult. The phenomenon of strong typhoon destroying the dis-connector mainly includes the fracture of post insulator and the conductive arm. In the study of the mechanical properties of post insulator and the conductive arm, almost all wind loads are treated as a concentrated force, but the surfaces of the post insulator and the conductive arm are actually subjected to a continuous wind pressure distribution. The magnitude of the wind load and the error of its application method will inevitably lead to inaccurate stress and strain data obtained in the calculation of the strength of the post insulator and the conductive arm, so that the post insulator and the conductive arm cannot be accurately designed. In this paper, the wind resistance of the dis-connector are studied by using the fluid-structural coupling analysis method. Firstly, the hydrodynamic RNG k-ε turbulence model is used to simulate the wind field around the dis-connector, so as to obtain the accurate result of the wind pressure distribution on the surface of the dis-connector. Then the surface pressure of the dis-connector calculated by hydrodynamics simulation is introduced into the structural module of Ansys software as the applied load. The finite element method is used to simulate and calculate the stress and strain of the dis-connector, so as to obtain the mechanical characteristics of the dis-connector under strong wind. In addition, this paper analyzes the effects of different wind speeds and different wind directions on the wind load applied to the surface of dis-connector, and provide a basis for wind resistance design of dis-connector.
{"title":"Simulation Study on Wind Load and Mechanical Characteristics of High Voltage Dis-Connector","authors":"Liuhuo Wang, Jinwei Ma, Xiaofeng Pang, Tong Jiang, Lijun Wang, Zengbin Wang","doi":"10.1109/ICEPE-ST.2019.8928733","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928733","url":null,"abstract":"The high-voltage dis-connector, as a key substation equipment in the power grid structure, is vitally important to the quality of the power grid operation. Due to the geographic location of Guangdong Province of China, many strong typhoons have caused great damage to power facilities in recent years. And the loss of the dis-connector is the most serious, which severely affects the reliability of the power supply. However, the research on the wind resistance of the dis-connector is still few, so the improvement work of the device is quite difficult. The phenomenon of strong typhoon destroying the dis-connector mainly includes the fracture of post insulator and the conductive arm. In the study of the mechanical properties of post insulator and the conductive arm, almost all wind loads are treated as a concentrated force, but the surfaces of the post insulator and the conductive arm are actually subjected to a continuous wind pressure distribution. The magnitude of the wind load and the error of its application method will inevitably lead to inaccurate stress and strain data obtained in the calculation of the strength of the post insulator and the conductive arm, so that the post insulator and the conductive arm cannot be accurately designed. In this paper, the wind resistance of the dis-connector are studied by using the fluid-structural coupling analysis method. Firstly, the hydrodynamic RNG k-ε turbulence model is used to simulate the wind field around the dis-connector, so as to obtain the accurate result of the wind pressure distribution on the surface of the dis-connector. Then the surface pressure of the dis-connector calculated by hydrodynamics simulation is introduced into the structural module of Ansys software as the applied load. The finite element method is used to simulate and calculate the stress and strain of the dis-connector, so as to obtain the mechanical characteristics of the dis-connector under strong wind. In addition, this paper analyzes the effects of different wind speeds and different wind directions on the wind load applied to the surface of dis-connector, and provide a basis for wind resistance design of dis-connector.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"14 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":"114608798","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.2019.8928886
Beibei Wang, Hailong He, Yi Wu, C. Niu, M. Rong, Longlong Wang
A new structure of liquid metal fault current limiter (LMFCL), which can shorten pre-arcing time under short circuit faults significantly, is introduced in this paper. The limiter utilizes a current injection method to strengthen the self-pinch effect in liquid metal, thus responding faster to fault currents in power systems. As we know in the previous literature, a narrow channel in the current path through liquid metal leads to an increase in current density, strengthening the self-pinch effect consequently. Obviously, a channel with smaller cross-sectional area will obtain a higher current density and ignite an arc faster, but the rated current-carrying capacity is also decreased. Compared to existing liquid metal fault current limiters, the proposed one has a shorter pre-arcing time and allows a considerable rated current at the same time. First, the model and operation principles of the new structure are presented. Next, simulations of the current and force distributions in the limiter are carried out. It will help to explain how the self-pinch effect is strengthened, so as to make it easier to ignite an arc. Then, the pre-arcing time behavior and current limiting performance of the proposed structure are tested to validate the idea. Finally, the experimental results are concluded, and future research directions are discussed.
{"title":"Investigation of a Liquid Metal Fault Current Limiter Based on Current Injection Method","authors":"Beibei Wang, Hailong He, Yi Wu, C. Niu, M. Rong, Longlong Wang","doi":"10.1109/ICEPE-ST.2019.8928886","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928886","url":null,"abstract":"A new structure of liquid metal fault current limiter (LMFCL), which can shorten pre-arcing time under short circuit faults significantly, is introduced in this paper. The limiter utilizes a current injection method to strengthen the self-pinch effect in liquid metal, thus responding faster to fault currents in power systems. As we know in the previous literature, a narrow channel in the current path through liquid metal leads to an increase in current density, strengthening the self-pinch effect consequently. Obviously, a channel with smaller cross-sectional area will obtain a higher current density and ignite an arc faster, but the rated current-carrying capacity is also decreased. Compared to existing liquid metal fault current limiters, the proposed one has a shorter pre-arcing time and allows a considerable rated current at the same time. First, the model and operation principles of the new structure are presented. Next, simulations of the current and force distributions in the limiter are carried out. It will help to explain how the self-pinch effect is strengthened, so as to make it easier to ignite an arc. Then, the pre-arcing time behavior and current limiting performance of the proposed structure are tested to validate the idea. Finally, the experimental results are concluded, and future research directions are discussed.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"91 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":"124422303","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.2019.8928840
Shijia Wang, Yongxing Wang, Enyuan Dong, J. Zou, Chao Sun, Lu Jiang
Test technology is important to evaluate the performance of DC circuit breaker. The synthetic test method is mainly used in high-capacity breaking test. In this paper, a practical and feasible control scheme is designed to the synthetic test circuit. The control system is based on Digital Signal Processor. It controls the charge and discharge of the synthesis test three power supply, and controls the charge of actuators and its trigger. It also acquires real-time experimental data and analyzes the whole test process. The interference in synthetic test control system is analyzed. To minimize the impact of high frequency and high voltage test environment, electrical signals are converted to optical signals for transmission. The upper monitor can remotely control the whole experiment process and observe the experiment results. A test loop was built to perform the experiment. The test results shows that the control system greatly improve the control accuracy and the success rate of synthetic test.
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