2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)最新文献_第6页

Simulation Research on Driving Technology and Influence Factors of Double-layer Coil Type Rapid Repulsive Mechanism of 40.5kV Vacuum Circuit Breaker 40.5kV真空断路器双层线圈式快速排斥机构驱动技术及影响因素仿真研究

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928877

Lijun Wang, Jinwei Ma, Jing Jiang, S. Jia, Shengbin Wu, Feng Pan, Haibo Su, Yong Wang

{"title":"Simulation Research on Driving Technology and Influence Factors of Double-layer Coil Type Rapid Repulsive Mechanism of 40.5kV Vacuum Circuit Breaker","authors":"Lijun Wang, Jinwei Ma, Jing Jiang, S. Jia, Shengbin Wu, Feng Pan, Haibo Su, Yong Wang","doi":"10.1109/ICEPE-ST.2019.8928877","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928877","url":null,"abstract":"Circuit breakers are important control and protection devices in power systems and are essential for ensuring safe and reliable operation of power systems. In recent years, the application of fast electromagnetic repulsive mechanism based on the principle of eddy current in vacuum circuit breaker has gradually become a hot research topic. However, due to the large mass of the moving mechanism and the large opening distance in the high voltage vacuum circuit breaker, it is difficult for the ordinary mechanism to break quickly. Therefore, a double-layer coil type fast electromagnetic repulsive mechanism is proposed, which can generate a larger electromagnetic repulsive force to achieve fast driving of the mechanism. Taking the 40.5kV/50kA vacuum circuit breaker as an example, the 2D finite element model was built by MAXWELL software, and its motion characteristics were simulated. In addition, the effect of the metal plate thickness, coil inner radius, number of coil turns and initial gap on the motion characteristics of the fast electromagnetic repulsive mechanism is investigated. The results show that the rise time of the electromagnetic repilsive force is very short. In contrast, the electromagnetic repilsive force has a long time to fall, and the peak value of the electromagnetic repilsive force is large. Thickening the metal plate, increasing the inner radius of the coil plate, increasing the number of coil turns and reducing the initial gap can increase the speed of the rapid electromagnetic repulsive mechanism. The simulation analysis provides a basis for further design of the electromagnetic repilsive mechanism.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"19 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":"132169203","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}

引用次数: 0

Numerical Thermofluid Simulation on 10 kA-class High Current Fault Arcs in Air Contaminated with Metal Vapor from Evaporation of Metal Electrodes in Open Air 露天金属电极蒸发金属蒸气污染空气中10 ka级大电流故障电弧的热流体数值模拟

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928812

T. Takeshima, Yasunori Tanaka, Y. Nakano, Y. Uesugi, T. Ishijima

引用次数: 0

A New Prediction Model of SF6 Alternative Gases in Electrical Strength SF6替代气体电强度预测新模型

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928678

Luqi Liang, Yi Wu, Haonan Sun, M. Rong, Chunlin Wang, Haodong Chang

{"title":"A New Prediction Model of SF6 Alternative Gases in Electrical Strength","authors":"Luqi Liang, Yi Wu, Haonan Sun, M. Rong, Chunlin Wang, Haodong Chang","doi":"10.1109/ICEPE-ST.2019.8928678","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928678","url":null,"abstract":"Sulfur-Hexafluoride (SF6) has been widely used for gas insulation in power industry. However, due to its high Global Warming Potential (GWP), considerable effort has been undertaken to find eco-friendly replacement gases but without significant success for decades. In the study of alternative gas searching, the large number of candidate alternative gases limits the searching approach by the experiments. And in this work, different prediction models for gas electrical strength proposed by different researchers with their respective advantages are compared and concluded. Moreover, a new efficient model is developed. According to a comprehensive sample set of 73 gas species, different molecular properties are calculated based on the density functional theory. Strong correlations between electrical strength and above predictors are obtained by multiple regression. This model has a low computational cost and can be used for molecular screening of SF6 alternative gas from the point of insulation property. In addition, by studying above predictors with clear physical meaning, it can be helpful to analyze how to make considerable improvements in the electrical strength, which can prompt the process of molecular design of SF6 alternative gases.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"67 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":"115985503","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}

引用次数: 2

Analysis of Ferromagnetic Resonance in 550 kV GIS Electromagnetic Voltage Transformer 550kv GIS电磁电压互感器铁磁共振分析

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928683

Shuang Leng, Sha Hao, Xin Lin, Chen Cao, Xiaolong Li

{"title":"Analysis of Ferromagnetic Resonance in 550 kV GIS Electromagnetic Voltage Transformer","authors":"Shuang Leng, Sha Hao, Xin Lin, Chen Cao, Xiaolong Li","doi":"10.1109/ICEPE-ST.2019.8928683","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928683","url":null,"abstract":"Over-voltage caused by many reasons in the power system, where the voltage transformer ferromagnetic resonant over-voltage occur frequently, has great harmfulness. Based on the complexity of the ferromagnetic resonance phenomenon, this paper started from a 550 kV gas insulated metal-closed switchgear (GIS) project, and established a distributed parameter model of ferromagnetic resonance calculation. 12 typical ferromagnetic resonance conditions are selected, and calculated from the simulation software of ferromagnetic resonance. According to the result of the regularity occurrence of ferromagnetic resonance, this paper proposed preventive countermeasures that minimize harm. The calculation result shows that the resonant over-voltage with higher amplitude appears in the case of two circuit breakers running side-by-side or three circuit breakers running side-by-side, with a maximum of about 1.34p.u. and a primary frequency of 1/3 frequency division. The input voltage transformer secondary side detuning device accelerates the attenuation of primary voltage low-frequency oscillation to a certain extent. At the same time, a high amplitude excitation current is produced, the maximum is about 0.986A, and the continuous oscillatory excitation current will cause the VT to burn out in operation.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"129 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":"117208420","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}

引用次数: 1

Research on the Interruption Characteristics of Wan-type Transverse Magnetic Field Contacts 万型横向磁场触点中断特性研究

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928837

Li Zhao, S. Xiu, Jiashuo Cui, Zepeng Chen, Mengru Li, Bo Yuan

{"title":"Research on the Interruption Characteristics of Wan-type Transverse Magnetic Field Contacts","authors":"Li Zhao, S. Xiu, Jiashuo Cui, Zepeng Chen, Mengru Li, Bo Yuan","doi":"10.1109/ICEPE-ST.2019.8928837","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928837","url":null,"abstract":"With the outstanding advantages of short current path, small on-resistance and low cost, the transverse magnetic field (TMF) contacts have been widely applied in medium voltage power systems. In this paper, the vacuum arc experimental system was established using the inductor-capacitor (LC) oscillation circuit, wan-type transverse magnetic field contacts were installed in the demountable vacuum chamber, and the vacuum arc behavior was recorded by the high-speed video camera to research arc characteristics during the arcing process, which including the initial ignition stage, the expansion stage, the arc motion stage and the diffuse stage. In addition, the impact of opening moments was analyzed, and the relationship between arc voltage and arc appearances was summarized. It was found that the change of arc column number in the expansion stage would cause sudden fluctuations of the arc voltage, and unstable arc motion and plasma splash would give rise to arc voltage noise. Then tested contacts were installed into the vacuum interrupters with the same structure and size, the interrupting characteristic experiments of vacuum interrupters with TMF contacts and vacuum interrupters with axial magnetic field (AMF) contacts were completed, and the power frequency withstand tests and the lightning impulse tests of the vacuum interrupters were carried out. The results showed that the wan-type TMF contacts used in this paper had equivalent interruption characteristics as the six-slot cup-shaped AMF contacts.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"90 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":"116290957","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}

引用次数: 0

Influence of Oscillating Frequency of External Transverse Magnetic Field on DC Vacuum Arc Evolution 外横磁场振荡频率对直流真空电弧演化的影响

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928702

Jingyi Wang, Hui Ma, Shaoweihua Liu, Feiliang Hu, Zhiyuan Liu, Yingsan Geng, Jianhua Wang

{"title":"Influence of Oscillating Frequency of External Transverse Magnetic Field on DC Vacuum Arc Evolution","authors":"Jingyi Wang, Hui Ma, Shaoweihua Liu, Feiliang Hu, Zhiyuan Liu, Yingsan Geng, Jianhua Wang","doi":"10.1109/ICEPE-ST.2019.8928702","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928702","url":null,"abstract":"The objective of this paper is to experimentally determinate the influence of the oscillating frequency of transverse magnetic field (TMF) on DC vacuum arc evolution. In this paper, the experimental DC voltage was about 340 V, with the DC current of 340 A. The frequency of oscillating TMF was set as 70 Hz, 230 Hz, 430 Hz and 720 Hz, respectively. A high-speed charge-coupled device (CCD) video camera was selected to record the vacuum arc evolution, with the recording speed of 180,000 frames/s. The experimental results showed that, the duration of total interrupting process decreased with the increasing of the frequency of oscillating TMF. When the oscillating frequency increased from 70 Hz to 230 Hz and 430 Hz, the duration of total interrupting process decreased from 1.60 ms to 1.00 ms and 0.60 ms, respectively. As the frequency of oscillating TMF increased, the velocity of cathode spots increased. When the oscillating frequency increased from 70 Hz to 230 Hz, 430 Hz and 720 Hz, the average velocity of cathode spots increased from 5.25 m/s to 7.30 m/s, 8.47 m/s and 16.71 m/s, respectively. Moreover, when the oscillating frequency was too high, cathode spots would reciprocate on the surface of contacts, resulting in the failure of interruption. This research can provide a novel method for the low-voltage DC breaking technology in vacuum.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"45 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":"114638420","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}

引用次数: 1

Microscopic Electric Field Enhancement on Contact Surface in Vacuum Interrupters with Contact Gap 10-60mm 接触间隙10-60mm真空灭流器接触面微观电场增强

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928935

Yingyao Zhang, Haoyu Wang, Xinye Xu, Manman Ma, He Yang, Biao Hu, Xiaojun Wang

{"title":"Microscopic Electric Field Enhancement on Contact Surface in Vacuum Interrupters with Contact Gap 10-60mm","authors":"Yingyao Zhang, Haoyu Wang, Xinye Xu, Manman Ma, He Yang, Biao Hu, Xiaojun Wang","doi":"10.1109/ICEPE-ST.2019.8928935","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928935","url":null,"abstract":"It is widely known that microscopic electric field on contact surface in vacuum interrupters (VIs) is fundamental to study vacuum breakdown mechanism based on different breakdown initiating theories, such as micro-particles initiating mechanism, field emission initiating mechanism and so on. Furthermore, the microscopic electric field enhancement on the contact surface is influenced by contact gaps. The objective of this paper is to investigate the relationship between the microscopic electric field enhancement and the contact gap based on the modeling of the shape contours and the microscopic rough contours of the micro-protrusions on the contact surface in VIs. In this paper, the shape contours of the micro-protrusions are measured by Scanning Electron Microscope (SEM) and the rough contours of the micro-protrusions are extracted by Atomic Force Microscopy (AFM). In order to establish the microscopic rough contours based on the Weierstrass-Mandelbrot fractal model, wavelet analysis is used to extract the fractal dimension and the genetic algorithm is used to extract the fractal scaling constant. The shape contour which is fitted by polynomial functions is superimposed on the rough contour. Then, a complete micro-protrusion model is established. Finally, the electric field distribution of the micro-protrusion model on the contact surface with the contact gap of 10-60mm is simulated. The results show that the microscopic electric field enhancement depends on the 0.09 power of the contact gap for the 10-60mm contact gap. The results of this paper may provide some useful information to study the vacuum breakdown mechanism.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"3 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":"123658723","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}

引用次数: 0

An Experimental Study on Arc Discharge Occured by Breaking of Line in Low-Voltage PV Systems 低压光伏系统断线产生电弧放电的实验研究

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928818

Akihiro Tsusaka, Toshiya Yokoi, T. Matsumura, K. Yukita, Y. Goto, Atsushi Miyamoto, Hiroyuki Ito

引用次数: 0

Mechanical Condition Assessment of High Voltage Circuit Breakers Based on Improved Dempster-Shafer Theory 基于改进Dempster-Shafer理论的高压断路器力学状态评估

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928754

Shishi Fan, Jing Yan, Luyao Han, Mengyuan Xu, Zhiyuan Liu, Yingsan Geng, Chen Guan

{"title":"Mechanical Condition Assessment of High Voltage Circuit Breakers Based on Improved Dempster-Shafer Theory","authors":"Shishi Fan, Jing Yan, Luyao Han, Mengyuan Xu, Zhiyuan Liu, Yingsan Geng, Chen Guan","doi":"10.1109/ICEPE-ST.2019.8928754","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928754","url":null,"abstract":"Among all kinds of faults that affect the operation reliability of high-voltage circuit breakers, mechanical faults account for the highest proportion. Therefore, it’s necessary and urgent to find an effective way for mechanical condition assessment. In this paper, the vibration signal, opening/closing coil current and stroke-time curve are selected to evaluate the mechanical condition of high voltage circuit breakers in order to overcome the shortcomings of single signal diagnosis. Dempster-Shafer evidence theory (DST), as a method of reasoning for dealing with uncertainty, has been widely used in information fusion. Therefore, this paper chooses DST to carry out multi-signal fusion and comprehensively evaluates the running status of the circuit breaker. However, in order to overcome the defects of DST in dealing with conflict evidence, this paper proposes an improved DST. Firstly, various signals are combined to assess the accuracy of the allocation of uncertain information and the evidences are constructed. Secondly, the evidences are corrected based on the similarity coefficient and similarity matrix between the evidences, and then the evidence fusion is performed. Thirdly, based on the evidence distance between the new evidences and the original evidences, the best original evidence is selected and uncertain information of the merged evidence is redistributed. Finally, mechanical condition of the high voltage circuit breaker is determined. Identification experiments are carried out to demonstrate the effectiveness and feasibility of this method, avoiding the misjudgment due to the abnormality of single signal.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"60 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":"131885314","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}

引用次数: 2

Thermodynamic and Transport Characteristics of High Temperature Atmospheric Air Arcs containing Two Different Metal Vapor of Cu, Fe and Al 含Cu、Fe、Al两种不同金属蒸气的高温大气电弧热力学及输运特性

2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST) Pub Date : 2019-10-01 DOI: 10.1109/ICEPE-ST.2019.8928699

Y. Nakano, Yasunori Tanaka, Y. Uesugi, T. Ishijima

{"title":"Thermodynamic and Transport Characteristics of High Temperature Atmospheric Air Arcs containing Two Different Metal Vapor of Cu, Fe and Al","authors":"Y. Nakano, Yasunori Tanaka, Y. Uesugi, T. Ishijima","doi":"10.1109/ICEPE-ST.2019.8928699","DOIUrl":"https://doi.org/10.1109/ICEPE-ST.2019.8928699","url":null,"abstract":"Serious fault of high energy arcing fault (HEAF) can occur in electrical equipment. When a large current is supplied to a possible arc discharge, a sudden temperature rise and a pressure rise would occur inside the arc, which will cause serious damage to the power board and switchboard leading to fire accident. It is not realistic to consider and experimentally verify all the individual switchboard events, but the theoretical explanation of experimental observation data such as current-voltage characteristics and damage degree are necessary. The arc characteristics should be described with melting and vaporization of metal conductors, because it can directly influence on the arc performance due to changes in thermodynamics and transport characteristics. The present work provides the theoretical calculation results on thermodynamic and transport characteristics under atmospheric air from 300 K to 30,000 K considering two different metal vapor contamination of Cu, Fe and/or Al. Equilibrium compositions of air with two different metal vapor were calculated through the Gibbs free energy minimization method. Then, mass density, enthalpy, specific heat, electric conductivity, thermal conductivity and viscosity from 300 K to 30,000 K of air with/without metal vapor were calculated. These numerical calculation data would be very important for theoretical studies of atmospheric arcs of HEAF and thermal plasmas, and for the design of arc devices.","PeriodicalId":392306,"journal":{"name":"2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)","volume":"12 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":"134150368","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}

引用次数: 0