2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)最新文献_第8页

Erosion rate in a vacuum arc and in a gas arc at threshold currents 真空电弧和气体电弧在阈值电流下的腐蚀速率

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748757

A. Murzakaev

{"title":"Erosion rate in a vacuum arc and in a gas arc at threshold currents","authors":"A. Murzakaev","doi":"10.1109/DEIV.2016.7748757","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748757","url":null,"abstract":"The present paper reports an experimental study of the erosion rate of pulsed arcs in vacuum under the influence of surface conditions (contaminants and clean), and ambient gases (argon, nitrogen with high purity introduced with pressures 600 Torr) with cold cathodes. Erosion rates have been studied of wires cathodes from Au, Ag, Cu, W prepared by heating less then melting temperature prior to arcing. Such surfaces may be sufficiently clean also without preceding erosion. In both systems the ion current streaming was measured by a biased collector. It appears that the erosion rates are not changed by outer influences background gas. The discrepancy between the ion collection and weighing methods clearly points to the contribution of macroparticles to cathode erosion. It has been shown that macroparticle mass losses are indeed important. Experimental results show that the mass of cathode material removed by the macroparticles flux is greater than the mass of cathode material leaving in form of ions. Besides ion current measurements also used the weighing method to determine the total erosion rate of cathode materials. From the analysis of the erosion rate as a function of charge transferred by the vacuum arc and arc in gases were concluded that the total erosion rate approaches the ion erosion rate if the charge transferred by the arc is small. The dependence of the ion current from vacuum arc current is in linear relation. The approximate independence of arc current is consistent with findings that increasing the arc current leads to an increase in the number of emission centers rather than changing the character of these centers.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122201253","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

Improvement the stability of operation of a high-current, plasma-filled electron gun 提高高电流等离子体填充电子枪的工作稳定性

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7764030

P. Kiziridi, G. Ozur, E. Yakovlev

引用次数: 0

Determination of opening velocities for vacuum circuit breakers at transmission voltage 传输电压下真空断路器开断速度的测定

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748703

X. Yao, Jianhua Wang, Yingsan Geng, Zhiyuan Liu, Xiaoshe Zhai

{"title":"Determination of opening velocities for vacuum circuit breakers at transmission voltage","authors":"X. Yao, Jianhua Wang, Yingsan Geng, Zhiyuan Liu, Xiaoshe Zhai","doi":"10.1109/DEIV.2016.7748703","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748703","url":null,"abstract":"The objective of this paper is to propose a quantitative method to determine opening velocities for VCBs at transmission voltage. A couple of 2/3 coil-type axial magnetic field (AMF) contacts, which are used in a 126 kV vacuum interrupter, are arranged in a demountable vacuum chamber. The movable contact is opening with three different kinds of opening travel-curves. Each curve is adjusted by two opening velocities, v1 and v2, respectively. The v1 is an average opening velocity within 1/3 full contact gap, which is with 1.8 m/s, 2.4 m/s and 2.7 m/s, respectively. The v2 is an average opening velocity within 2/3 full contact gap, which is with 2.4 m/s, 2.7 m/s, and 3.0 m/s, respectively. The test current ranges from 4 kA to 40 kA, stepped by 4 kA. When a VCB is used to interrupt a short-circuit current, the preferred opening velocity is determined by reducing the arcing interval tI for the intense arc mode and increasing the arcing interval tII until the formation of high-current anode mode (HAM). The preferred v1 is higher than a threshold value v1_th, at which there is a peak critical contact gap dI_peak, for the evolving from intense arc mode into diffuse arc mode. The preferred value v2 is lower than another threshold value v2_th, at which there also exists a peak critical contact gap dII_peak, for the evolving from diffuse arc mode into the footpoint mode and anode spot mode.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123325506","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: 4

Flashover time delay characteristics of grooved insulators under nanosecond pulse voltage in vacuum 真空纳秒脉冲电压下槽形绝缘子闪络延迟特性研究

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748686

Guo-Qiang Su, Baipeng Song, Yi-Bo Wang, H. Mu, Guanjun Zhang

{"title":"Flashover time delay characteristics of grooved insulators under nanosecond pulse voltage in vacuum","authors":"Guo-Qiang Su, Baipeng Song, Yi-Bo Wang, H. Mu, Guanjun Zhang","doi":"10.1109/DEIV.2016.7748686","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748686","url":null,"abstract":"For dielectric-vacuum compound insulation systems, the discharges usually occur across the insulator surface with an onset voltage much lower than the breakdown voltage for vacuum gap of the same length, which is the main cause leading to insulation failure. It has always been a hot topic to improve the surface insulation strength in vacuum. In this paper, the relationship between the flashover time delay and electric field is studied under nanosecond impulse voltage. Experiment results suggest that the flashover time delay was proportional to N-th power of electric field for grooved insulators with different parameters. For grooved insulator, the flashover channel prefer to develop along the grooves rather than pass over the groove wall. The blocking effect of grooves to the electron multiplication in cathode-anode direction leads to the increased time delay. A narrow band of electric field with respect to time delay is formed over the flat samples. The breakdown electric field of a grooved insulator was increased by more than 100% than that of a flat one. The flashover electric field tends to be saturated when the groove depth is more than 2 mm for both PTFE and PMMA, which is correlated with the trajectory of electrons travelling across insulator surface. Grooves near electrode is more effective to increase surface insulation strength than grooves in middle area, which can be of great help to guide the structure optimization in engineering application.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125550867","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

A new copper based hermetic sealing material: A comparison with AgCu28GeCo0.3 一种新型铜基密封材料:与AgCu28GeCo0.3的比较

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7763984

S. Hildebrandt, G. Wiehl

引用次数: 0

The experimental investigation of a charged particle flows in a submicrosecond vacuum arc at a threshold current 带电粒子在阈值电流下亚微秒真空弧内流动的实验研究

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748753

Y. Zemskov, I. Muzyukin

{"title":"The experimental investigation of a charged particle flows in a submicrosecond vacuum arc at a threshold current","authors":"Y. Zemskov, I. Muzyukin","doi":"10.1109/DEIV.2016.7748753","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748753","url":null,"abstract":"A time dependence of in generation during a lifetime of a single cathode spot is of a great importance. To obtain such a dependence it is necessary to investigated vacuum discharge at a threshold current with small size electrode setup. Vacuum arc was feed by capacitor with restrictive resistor. After arc ignition the arc current decreases in time of 300-500ns up to threshold current. When threshold current was achieved there was only single cathode spot operating in a vacuum arc. A small discharge setup was used to obtain nanosecond time resolution on the ion flow measurement. Cathode-anode gap and anode - collector gap was established as 0.1mm. The average time of fly of ions from cathode spot to the collector can be estimated as 10ns. The estimated lifetime of cathode spot on a molybdenum cathode is 20-50ns. Thus the electrode setup built at the present experiments can be used to obtain ion generation dependence during a single cathode spot lifetime. The electron flow time dependence was obtained too. The results obtained make it possible to connect charged particle flow fluctuations with cathode spot life cycle.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116588720","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

Voltage conditioning effect on CuCr contacts CuCr触点的电压调节效应

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748672

S. Lagotzky, H. Schellekens, A. Papillon, G. Muller

{"title":"Voltage conditioning effect on CuCr contacts","authors":"S. Lagotzky, H. Schellekens, A. Papillon, G. Muller","doi":"10.1109/DEIV.2016.7748672","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748672","url":null,"abstract":"A dc field emission scanning microscope (FESM) was used to characterize the electron emission current of CuCr25 sintered contacts. Field emission scans at 20-50 MV/m using a truncated cone anode of 300 μm in diameter localized emitting defects with a positioning accuracy of ~150 μm in the measured area (~25 mm2) of the contact. The strongest activation of emitters was noticed at 30-40 MV/m resulting in 15 emitters at 50 MV/m. Afterwards, the I(E)-characteristic of the 10 dominant emission sites was measured locally. Two different types of emission could be observed: a normal Fowler-Nordheim-like emission where the current depends only on the applied voltage, and an abnormal emission where the current shows a strong hysteresis between the rising voltage branch and the decreasing voltage branch. The abnormal behavior can lead to an emission current increase once a critical electric field is exceeded. Possible surface effects influencing the emission current are either open pores or dielectric inclusions at the grain boundaries. The field emission enhancement factor β of these sites vary from 115 to 300 similar to values reported before. The number density of emitters is well above 0.5/mm2. In sealed vacuum interrupters only one emitter is active at a specific moment in time, shadowing the other emitters.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128285951","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

Lightning impulse voltage breakdown characteristics of vacuum interrupters with different contact materials 不同触点材料真空灭弧雷击电压击穿特性

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748681

Yingyao Zhang, Xinye Xu, Lijun Jin, Yewen Zhang

引用次数: 0

Simulation and analysis of a HVDC vacuum circuit breaker based on artificial current zero 基于人工零流的高压直流真空断路器仿真与分析

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7763952

Qiaosen Wang, Z. Shi, Yingkui Zhang, S. Jia, Lijun Wang

引用次数: 5

Numerical simulation of HCVA with considering the micro process of anode vapor 考虑阳极蒸汽微过程的HCVA数值模拟

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748727

Xiaolong Huang, Lijun Wang, Xiao Zhang, S. Jia, Z. Shi

引用次数: 2