Pub Date : 2019-10-01DOI: 10.1109/ICEPE-ST.2019.8928664
Tengyu Huo, C. Niu, Hailong He, Yi Wu, Longlong Wang, M. Rong
The paper deals with a principle of AC/DC interruption for low voltage air circuit breakers. When fault occurs, by squeezing the arc into constricted insulating slits, the arc resistance would be elevated, resulting in an arc voltage that is higher than system voltage. Hence, the fault current would decrease till the arc plasma cannot be maintained. The AC and DC interruption performance of a test switch based on this method were experimentally studied and analyzed. The breaking waveforms of AC/DC interruption using proposed method were analyzed and presented. The influence of insulating slit dimensions on DC interruption characteristics is experimentally studied. The research shows that a narrower insulating slit would benefit the DC interruption process, resulting in higher arc voltage and shorter interruption time.
{"title":"Air Arc Squeezed into Insulating Slits - AC/DC Interruption","authors":"Tengyu Huo, C. Niu, Hailong He, Yi Wu, Longlong Wang, M. Rong","doi":"10.1109/ICEPE-ST.2019.8928664","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928664","url":null,"abstract":"The paper deals with a principle of AC/DC interruption for low voltage air circuit breakers. When fault occurs, by squeezing the arc into constricted insulating slits, the arc resistance would be elevated, resulting in an arc voltage that is higher than system voltage. Hence, the fault current would decrease till the arc plasma cannot be maintained. The AC and DC interruption performance of a test switch based on this method were experimentally studied and analyzed. The breaking waveforms of AC/DC interruption using proposed method were analyzed and presented. The influence of insulating slit dimensions on DC interruption characteristics is experimentally studied. The research shows that a narrower insulating slit would benefit the DC interruption process, resulting in higher arc voltage and shorter interruption time.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"31 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":"126547628","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.2019.8928891
Yuanjing Lu, Jin Guo, Xu Jiang
The arc current-zero period phenomenon is directly related to the interruption performance of the high-voltage gas circuit breaker, which can be used to evaluate its breaking performance. The corresponding simulation study can quickly and effectively select the better prototype design of circuit breaker, reduce the product development cost, and accelerate the research and development process. This paper calculates the MHD arc simulation for the circuit breaker under various conditions. With the inputs of arc current and arc voltage obtained from simulation, we obtain the approximately optimal arc current-zero period model by using the generic algorithm and the high precision Runge-Kutta numerical calculation method. Based on this model, we calculate the post-arc current corresponding to the recovery voltage under various conditions. This paper obtains the zero-zone state evaluation by the simulation results and the experiment results, which can be efficiently used for qualitative analysis of the interruption performance of high voltage circuit breakers in engineering.
{"title":"Simulation Study on Current-zero Period Phenomenon and Analyse of High Voltage Gas Circuit Breaker","authors":"Yuanjing Lu, Jin Guo, Xu Jiang","doi":"10.1109/ICEPE-ST.2019.8928891","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928891","url":null,"abstract":"The arc current-zero period phenomenon is directly related to the interruption performance of the high-voltage gas circuit breaker, which can be used to evaluate its breaking performance. The corresponding simulation study can quickly and effectively select the better prototype design of circuit breaker, reduce the product development cost, and accelerate the research and development process. This paper calculates the MHD arc simulation for the circuit breaker under various conditions. With the inputs of arc current and arc voltage obtained from simulation, we obtain the approximately optimal arc current-zero period model by using the generic algorithm and the high precision Runge-Kutta numerical calculation method. Based on this model, we calculate the post-arc current corresponding to the recovery voltage under various conditions. This paper obtains the zero-zone state evaluation by the simulation results and the experiment results, which can be efficiently used for qualitative analysis of the interruption performance of high voltage circuit breakers in engineering.","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":"128006996","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.2019.8928695
Misato Shibata, Y. Enami, M. Sakata
This paper describes effects of changing parameters of arc root model on arc behavior in arc gas flow analysis.Fuji Electric has developed arc simulation technology that couples thermal fluid analysis with electromagnetic field analysis to predict the behavior of arc generated by contact switching. The arc simulation technology has been applied to the development of our many products.At the surface where the arc is in contact with the electrode (arc root), temperature and electric potential change rapidly and complicated non-equilibrium phenomena occur, such as electron emission or absorption. To simplify these phenomena and to simulate with less computing power, we have been adopted the arc root model which is the voltage drop of arc root defined as a function of current density.It is known that electrode materials (e.g., Cu, Ag, Cu-W alloy) affect the behavior of arc root immobility, which has the strong relationship with the arc root model in our study. The effects of the arc root model parameters on arc behavior is shown with the result of arc simulations under various parameters. This study is the first step to reproduce changes of immobility behaviors by electrode materials with the arc simulation.
{"title":"Relationship between Arc Behavior and Parameters of the Arc Root Model in the Arc Gas Flow Analysis","authors":"Misato Shibata, Y. Enami, M. Sakata","doi":"10.1109/ICEPE-ST.2019.8928695","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928695","url":null,"abstract":"This paper describes effects of changing parameters of arc root model on arc behavior in arc gas flow analysis.Fuji Electric has developed arc simulation technology that couples thermal fluid analysis with electromagnetic field analysis to predict the behavior of arc generated by contact switching. The arc simulation technology has been applied to the development of our many products.At the surface where the arc is in contact with the electrode (arc root), temperature and electric potential change rapidly and complicated non-equilibrium phenomena occur, such as electron emission or absorption. To simplify these phenomena and to simulate with less computing power, we have been adopted the arc root model which is the voltage drop of arc root defined as a function of current density.It is known that electrode materials (e.g., Cu, Ag, Cu-W alloy) affect the behavior of arc root immobility, which has the strong relationship with the arc root model in our study. The effects of the arc root model parameters on arc behavior is shown with the result of arc simulations under various parameters. This study is the first step to reproduce changes of immobility behaviors by electrode materials with the arc simulation.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"175 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":"125800474","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.2019.8928687
M. Mohammadhosein, K. Niayesh, A. Akmal, H. Mohseni
Dynamic resistance measurement (DRM) is utilized as a non-invasive method to assess the condition of arc contacts in high voltage gas circuit breakers. The main objective of this study is to determine how sensitive the dynamic resistance of a gas circuit breaker is to the contact erosion caused by arcing in gas circuit breakers. For this purpose, short-circuit current interruption experiments have been performed on a puffer type 24 kV SF6 circuit breaker. The results show that the contact erosion does not occur uniformly on the surface of contacts, therefore until the whole surface is not eroded, the DRM is not able to detect any arc contact length variation. However, the amplitude of average arc contact resistance is in agreement with the amount of erosion.
{"title":"Sensitivity of Dynamic Resistance of Gas Circuit Breakers to the Arc-induced Contact Erosion","authors":"M. Mohammadhosein, K. Niayesh, A. Akmal, H. Mohseni","doi":"10.1109/ICEPE-ST.2019.8928687","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928687","url":null,"abstract":"Dynamic resistance measurement (DRM) is utilized as a non-invasive method to assess the condition of arc contacts in high voltage gas circuit breakers. The main objective of this study is to determine how sensitive the dynamic resistance of a gas circuit breaker is to the contact erosion caused by arcing in gas circuit breakers. For this purpose, short-circuit current interruption experiments have been performed on a puffer type 24 kV SF6 circuit breaker. The results show that the contact erosion does not occur uniformly on the surface of contacts, therefore until the whole surface is not eroded, the DRM is not able to detect any arc contact length variation. However, the amplitude of average arc contact resistance is in agreement with the amount of erosion.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"80 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":"115778560","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 discharge mechanism of the supercritical nitrogen (SCN2) at the critical point 127 K and 3.4 MPa were discussed, and the key parameters showing the discharge behaviors of the SCN2 were calculated numerically by the BOLSIG+. Furthermore, the dynamical behaviors of the SCN2 clustering are carefully demonstrated by the molecule dynamics theory and some distinctively phenomena are discovered by the simulating calculation under the 50, 100, 150, 200, 250, 300, 350, 400, 450 and 500 Td. The results show that SCN2 is a promising new dielectric in the future.
{"title":"Electron Impact Ionization, Attachment, Drift Velocities and Longitudinal Diffusion of SCN2 at the Critical Point 127 K and 3.4 MPa","authors":"Xinlong Dai, Chuntian Chen, Hongqing Wei, Hanan Zhu, Zhiyong Liu, D. Zheng, Shu-Ping Zhao","doi":"10.1109/ICEPE-ST.2019.8928773","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928773","url":null,"abstract":"The discharge mechanism of the supercritical nitrogen (SCN2) at the critical point 127 K and 3.4 MPa were discussed, and the key parameters showing the discharge behaviors of the SCN2 were calculated numerically by the BOLSIG+. Furthermore, the dynamical behaviors of the SCN2 clustering are carefully demonstrated by the molecule dynamics theory and some distinctively phenomena are discovered by the simulating calculation under the 50, 100, 150, 200, 250, 300, 350, 400, 450 and 500 Td. The results show that SCN2 is a promising new dielectric in the future.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"21 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":"132302169","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.2019.8928723
T. Miyazaki, Yasunori Tanaka, Y. Nakano, Y. Uesugi, T. Ishijima, Gaku Asanuma, T. Onchi
This paper describes calculation results on copper vapor dynamics in reduced pressure arcs between the copper electrodes with and without a metal shield wall surrounding. Such a reduced pressure arc can be seen during high current interruption between the electrodes in vacuum circuit breakers (VCBs). This arc plasma is established from metal vapor itself from the electrodes. We have originally developed a numerical model for vapor behavior in reduced pressure arcs on the basis of a hybrid method: vapor dynamics including ions and neutral atoms were simulated in low pressure using the particle method of moving particle semi-implicit (MPS) method, whereas the finite volume method (FVM) was used to simulate electron temperature and electro-magnetic fields. The arc behavior is well known to be influenced by vapor dynamics and also the presence of the metal shield wall. Influence of the presence of metal shield wall was here studied on the vapor dynamics, the heavy particle temperatures and the ionization degrees. Calculation results showed that copper vapor was more concentrated around the center of the electrode axis because of the reflection of particles by the wall. Ionization degree was also decreased due to the vapor neutralization.
{"title":"Numerical Modelling of Vapor Dynamics in Vacuum Arcs between Electrodes with Metal Shield Wall using Moving Particle Method","authors":"T. Miyazaki, Yasunori Tanaka, Y. Nakano, Y. Uesugi, T. Ishijima, Gaku Asanuma, T. Onchi","doi":"10.1109/ICEPE-ST.2019.8928723","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928723","url":null,"abstract":"This paper describes calculation results on copper vapor dynamics in reduced pressure arcs between the copper electrodes with and without a metal shield wall surrounding. Such a reduced pressure arc can be seen during high current interruption between the electrodes in vacuum circuit breakers (VCBs). This arc plasma is established from metal vapor itself from the electrodes. We have originally developed a numerical model for vapor behavior in reduced pressure arcs on the basis of a hybrid method: vapor dynamics including ions and neutral atoms were simulated in low pressure using the particle method of moving particle semi-implicit (MPS) method, whereas the finite volume method (FVM) was used to simulate electron temperature and electro-magnetic fields. The arc behavior is well known to be influenced by vapor dynamics and also the presence of the metal shield wall. Influence of the presence of metal shield wall was here studied on the vapor dynamics, the heavy particle temperatures and the ionization degrees. Calculation results showed that copper vapor was more concentrated around the center of the electrode axis because of the reflection of particles by the wall. Ionization degree was also decreased due to the vapor neutralization.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132479843","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.2019.8928931
Fabian Rademacher, K. Venna
Generator Circuit-Breakers (GCB), which are installed between the synchronous generator and the Generator Step-Up Transformer (GSUT), are not only used to interrupt the system source and generator source short-circuit currents but also to synchronize the generator with grids. During the process of the synchronization an Out-of-phase (Oop) fault can occur due to the wiring errors either from commissioning or from maintenance activities on the plant equipment. The angle of Oop decides the stresses on the equipment where a higher Oop angle leads to higher transient recovery voltages (TRV) and fault currents. At lower Oop angles, the DC time constant of the fault current will be longer that could lead to delayed current zeros. Thus, the stresses on the GCB while clearing the fault currents will be higher. This requires a GCB that is able to withstand longer arcing times and be interrupt these currents reliably.The vacuum interruption technology is well established in the medium voltage range up to 52 kV especially in the distribution circuits. The new dual logo standard IEC/IEEE 62271-37-013 (2015) describes the test procedure for testing generator circuit breaker with Out-of-phase faults and defines a maximum Out-Of-Phase angle of 90 °. The aim of this paper is to show the impact of Out-Of-Phase faults on generators and GCBs implementing vacuum interruption technology. Based on multiple simulations with different generator types using the commercial software PSS Netomac the impact of generator’s electrical & mechanical parameters on the Out-Of-Phase fault current behavior is studied. VGCBs have a special advantage in handling such Oop faults due to their capacity to withstand longer arcing times when compared to SF6. This makes VGCBs as a reliable technology in generator switching applications than other existing technologies today.
{"title":"Evaluation of the Impact of Out-Of-Phase Faults on Generators and Generator Circuit-Breakers implementing Vacuum Interruption Technology","authors":"Fabian Rademacher, K. Venna","doi":"10.1109/ICEPE-ST.2019.8928931","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928931","url":null,"abstract":"Generator Circuit-Breakers (GCB), which are installed between the synchronous generator and the Generator Step-Up Transformer (GSUT), are not only used to interrupt the system source and generator source short-circuit currents but also to synchronize the generator with grids. During the process of the synchronization an Out-of-phase (Oop) fault can occur due to the wiring errors either from commissioning or from maintenance activities on the plant equipment. The angle of Oop decides the stresses on the equipment where a higher Oop angle leads to higher transient recovery voltages (TRV) and fault currents. At lower Oop angles, the DC time constant of the fault current will be longer that could lead to delayed current zeros. Thus, the stresses on the GCB while clearing the fault currents will be higher. This requires a GCB that is able to withstand longer arcing times and be interrupt these currents reliably.The vacuum interruption technology is well established in the medium voltage range up to 52 kV especially in the distribution circuits. The new dual logo standard IEC/IEEE 62271-37-013 (2015) describes the test procedure for testing generator circuit breaker with Out-of-phase faults and defines a maximum Out-Of-Phase angle of 90 °. The aim of this paper is to show the impact of Out-Of-Phase faults on generators and GCBs implementing vacuum interruption technology. Based on multiple simulations with different generator types using the commercial software PSS Netomac the impact of generator’s electrical & mechanical parameters on the Out-Of-Phase fault current behavior is studied. VGCBs have a special advantage in handling such Oop faults due to their capacity to withstand longer arcing times when compared to SF6. This makes VGCBs as a reliable technology in generator switching applications than other existing technologies today.","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":"128921233","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 objective of this paper is to reveal the breakdown mechanism of double breaks in air under lightning impulse voltage. Two sphere-to-sphere air gaps was connected in series to model double break circuit breakers. The two air gaps in series underwent standard lightning impulse voltage (1.2/50μs). The two air gaps in series was vertically arranged to form a upper break and a lower break and the total gap distance was 50 mm. Gap distance of the upper break was manually adjusted from 5mm to 45 mm with a step of 5mm. The breakdown photographs were captured by a Canon E80D camera. Experimental Results shows the breakdown phenomenon can be classified into three types. The first type is the breakdown only occurred in the upper break, while there was no breakdown occurring in the lower break. It happened when the upper gap was in the range between 5mm to 15mm The second type is that breakdown occurred in both breaks almost simultaneously. It happened when the upper air gap distance ranged from 5 to 45 mm. The third type is the breakdown only occurred in the lower break, while there was no breakdown occurring in the upper break. It happened when the upper air gap distance was 45mm. The results implied that the breakdown in the double breaks in air was determined by a competition between a dielectric recovery time of a breakdown in one break and the voltage withstanding time of the other non-breakdown break.
{"title":"Breakdown Mechanism of Double Breaks in Air Under Lightning Impulse Voltage","authors":"Jiali Chen, Yingsan Geng, Jianhua Wang, Jian’gang Ding, Zhiyuan Liu, Xue Liu, X. Yao, Liqiong Sun, Xiuguagn Li, Feiyue Ma, Xiu Zhou","doi":"10.1109/ICEPE-ST.2019.8928797","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928797","url":null,"abstract":"The objective of this paper is to reveal the breakdown mechanism of double breaks in air under lightning impulse voltage. Two sphere-to-sphere air gaps was connected in series to model double break circuit breakers. The two air gaps in series underwent standard lightning impulse voltage (1.2/50μs). The two air gaps in series was vertically arranged to form a upper break and a lower break and the total gap distance was 50 mm. Gap distance of the upper break was manually adjusted from 5mm to 45 mm with a step of 5mm. The breakdown photographs were captured by a Canon E80D camera. Experimental Results shows the breakdown phenomenon can be classified into three types. The first type is the breakdown only occurred in the upper break, while there was no breakdown occurring in the lower break. It happened when the upper gap was in the range between 5mm to 15mm The second type is that breakdown occurred in both breaks almost simultaneously. It happened when the upper air gap distance ranged from 5 to 45 mm. The third type is the breakdown only occurred in the lower break, while there was no breakdown occurring in the upper break. It happened when the upper air gap distance was 45mm. The results implied that the breakdown in the double breaks in air was determined by a competition between a dielectric recovery time of a breakdown in one break and the voltage withstanding time of the other non-breakdown break.","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":"130973236","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.2019.8928747
Zhihui Huang, W. Tan, Q. Mao, L. Zou, J. Zou
At present, it is all three-phase simultaneous breaking when conventional vacuum circuit breaker breaks a 35KV shunt reactor. The traditional breaking method often produces serious switching overvoltage phenomena, which in turn causes equipment fault. All research experiments have shown that the main factor generating overvoltage is the continuous reignition of the first opening phase and the equivalent chopping current of the last two clearing poles during the breaking period, that is, the simultaneously breaking overvoltage of three phases. In the paper, the electromagnetic transient model for breaking 35 k V shunt reactor is set up by the use of PSCAD/EMTDC, and the overvoltage mechanism was simulated and analyzed. For the overvoltage caused by three-phase simultaneous breaking, phase-controlled switching strategy based on fast vacuum switch was proposed in the paper, which uses the fast vacuum switch and phase-controlled switching technology. The last two clearing phases are opened until the first opening phase is successfully broken. It is hoped that the probability of reignition of the first opening phase and equivalent chopping current of the latter two clearing phases are reduced fundamentally, which makes it possible to eliminate the switching overvoltage to the utmost extent.
目前，传统真空断路器开断35KV并联电抗器时，均为三相同时开断。传统的分断方式往往会产生严重的开关过电压现象，进而导致设备故障。所有的研究实验都表明，产生过电压的主要因素是在分断期间第一个开断相的连续重燃和最后两个清极的等效斩波电流，即三相同时分断过电压。本文利用PSCAD/EMTDC建立了35 k V并联电抗器开断的电磁暂态模型，并对其过电压机理进行了仿真分析。针对三相同时开断引起的过电压问题，提出了基于快速真空开关的相控开关策略，该策略将快速真空开关和相控开关技术结合起来。最后两个清除阶段被打开，直到第一个打开阶段被成功打破。希望从根本上降低第一开断相的重燃概率和后两个清相的等效斩波电流，从而最大程度地消除开关过电压。
{"title":"Controlled Breaking Strategy of Shunt Reactor Based on Fast Vacuum Switch","authors":"Zhihui Huang, W. Tan, Q. Mao, L. Zou, J. Zou","doi":"10.1109/ICEPE-ST.2019.8928747","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928747","url":null,"abstract":"At present, it is all three-phase simultaneous breaking when conventional vacuum circuit breaker breaks a 35KV shunt reactor. The traditional breaking method often produces serious switching overvoltage phenomena, which in turn causes equipment fault. All research experiments have shown that the main factor generating overvoltage is the continuous reignition of the first opening phase and the equivalent chopping current of the last two clearing poles during the breaking period, that is, the simultaneously breaking overvoltage of three phases. In the paper, the electromagnetic transient model for breaking 35 k V shunt reactor is set up by the use of PSCAD/EMTDC, and the overvoltage mechanism was simulated and analyzed. For the overvoltage caused by three-phase simultaneous breaking, phase-controlled switching strategy based on fast vacuum switch was proposed in the paper, which uses the fast vacuum switch and phase-controlled switching technology. The last two clearing phases are opened until the first opening phase is successfully broken. It is hoped that the probability of reignition of the first opening phase and equivalent chopping current of the latter two clearing phases are reduced fundamentally, which makes it possible to eliminate the switching overvoltage to the utmost extent.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"54 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":"133589447","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.2019.8928768
Toshifumi Sugimoto, M. Shimizu
It is necessary to identify the abnormal portion and take countermeasures when an operation failure occurs on a circuit breaker in a substation. However, after an operation failure many circuit breakers often operate normally when retried, and as a result, it has been difficult to identify the abnormal portion.The authors have focused attention on the sound generated from the operating mechanism of a circuit breaker, and investigated an operating sound diagnosis technique to identify the difference between normal and abnormal operations using some sample devices of 6.6 kV vacuum circuit breakers. As a result, it was found that the Fast Fourier Transform (FFT) color mapping technique and Partial Over All (P.O.A.) time-trend technique are effective methods for analyzing the operating sound of a circuit breaker. The FFT color mapping technique is an analytic method that visually evaluates the strength of sound pressure in time series for each frequency, and it makes it possible to grasp the qualitative difference in the operating sound of a circuit breaker.The P.O.A. time-trend technique is an analytic method that numerically evaluates the value of generated sound pressure from the 13 kHz to 15 kHz band as a time trend, and makes it possible to grasp the quantitative difference in the operating sound of the circuit breaker.By using these two methods, it has been possible to identify some operating sounds having different abnormal portions. As a result of the above investigation, it has been confirmed that operating sound diagnosis of the circuit breaker is an effective condition monitoring technique for detecting abnormality, since the operating sound is generated in chronological order related to the operation process of the circuit breaker.Then, the operating sound of an actual 500 kV circuit breaker with hydraulic driving gear was analyzed by using the methods. As a result, it was found that both close and open operations can be described by an FFT color map.
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