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

Improvement of the CERN SPS electrostatic septa ion traps CERN SPS静电隔离阱的改进

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-12 DOI: 10.1109/DEIV.2016.7764034

B. Balhan, R. Barlow, J. Borburgh, G. Raffaele

{"title":"Improvement of the CERN SPS electrostatic septa ion traps","authors":"B. Balhan, R. Barlow, J. Borburgh, G. Raffaele","doi":"10.1109/DEIV.2016.7764034","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7764034","url":null,"abstract":"At CERN, the SPS synchrotron is equipped with a slow extraction channel towards the fixed target beam lines in the North Area This channel includes five consecutive electrostatic septa, where the field free region and the active high field region are separated by an array of tungsten-rhenium wires. The field-free region provides for the circulating beam, while the high field region is used to deflect the extracted beam. Since the residual gas can be ionized by the orbiting beam, low energy ions could cross the wire array and enter the high field region and cause high voltage breakdown when accelerated onto the cathode. To prevent low energy ions from entering this high electric field region, a vertical field is applied to the orbiting beam using so-called `ion traps' for active protection. The vertical field is created by electrodes placed inside the region containing the circulating beam. Due to electromagnetic coupling onto the ion trap electrodes observed with the high frequency LHC beam (25 ns spaced bunches), the efficiency of the ion traps is greatly reduced. This leads to increased vacuum activity (electron cloud related) as well as high spark rates both in the main field and between the ion trap electrodes and their grounded support. In view of the SPS performance increase required for HL-LHC, this paper highlights the upgrades and improvements required to obtain a stable ion trap field and significantly reduce the number of breakdown events observed with the LHC beam in the accelerator.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131091174","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

Effective arcing contact gap of a 126 kV horseshoe type axial magnetic field vacuum interrupter 126kv马蹄型轴向磁场真空灭弧器的有效电弧接触间隙

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748712

Haomin Li, Yingsan Geng, Zhiyuan Liu, Chunhong Shen, Peng Li, Zhe Yang

{"title":"Effective arcing contact gap of a 126 kV horseshoe type axial magnetic field vacuum interrupter","authors":"Haomin Li, Yingsan Geng, Zhiyuan Liu, Chunhong Shen, Peng Li, Zhe Yang","doi":"10.1109/DEIV.2016.7748712","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748712","url":null,"abstract":"The objective of this paper is to determine the arcing contact gap for a 126 kV horseshoe type bipolar axial magnetic field (AMF) vacuum interrupter. A pair of contacts with contact material of CuCr50 was arranged in a demountable vacuum chamber. Movable contact was driven by a spring driven permanent magnetic actuator. The full contact gap was 60 mm. Arc current reached up to 40 kA rms, and arc duration was set as 9ms. Evolution of vacuum arc behaviors was observed by a high-speed digital camera. A long arcing contact gap is the maximum gap above which vacuum arcs cannot be controlled by the bipolar AMF. A short arcing contact gap is the minimum gap below which vacuum arcs are constrict. Experimental results show that the long arcing contact gap of the horseshoe type AMF contact is determined as 35 mm, in which the vacuum arc can be controlled by the AMF effectively. The short arcing contact gap is determined as 14 mm. In addition, a recommended arcing contact gap without arc distorting outside is determined as 27 mm. The long arcing contact gap and short arcing contact gap can be used to determine opening speed curve of the 126 kV horseshoe type bipolar AMF vacuum interrupter.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"46 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":"123166223","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

Investigation on the high current interruption principle for series gaps of vacuum gap and CO2 gas gap 真空间隙与CO2气隙串联间隙大电流中断原理研究

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7763962

Xian Cheng, Zhanqing Chen, G. Ge, Lian-yao Jiao

引用次数: 0

Investigation of welding characteristics and NSDD probabilities of different contact materials under capacitive load conditions 电容性负载条件下不同接触材料焊接特性及非损伤损伤概率研究

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748708

Gleb A. Kumichev, I. N. Poluyanova

引用次数: 1

Cathode spot plasma parameters in the breakdown stage of vacuum discharge 真空放电击穿阶段阴极点等离子体参数

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748674

A. Batrakov, S. Popov, E. Dubrovskaya

引用次数: 4

Boron-rich plasma of high current pulsed vacuum arc with lanthanum hexaboride cathode 六硼化镧阴极高电流脉冲真空电弧富硼等离子体

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7764032

V. Frolova, A. Nikolaev, E. Oks, K. Savkin, M. Shandrikov, A. Vizir, G. Yushkov

引用次数: 0

Experimental investigation on the current of cathode spot of vacuum arc in axial magnetic fields 轴向磁场下真空电弧阴极点电流的实验研究

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748716

Bingzhou Wu, Z. Shi, Cong Wang, S. Jia, Lijun Wang

引用次数: 2

Performance of vacuum interrupters in electrical power systems with an effectively earthed neutral 中性点有效接地的电力系统中真空灭弧器的性能

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7763965

E. Taylor, Joachim Oemisch, M. Eiselt, Marco Hinz

{"title":"Performance of vacuum interrupters in electrical power systems with an effectively earthed neutral","authors":"E. Taylor, Joachim Oemisch, M. Eiselt, Marco Hinz","doi":"10.1109/DEIV.2016.7763965","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7763965","url":null,"abstract":"Circuit breakers using vacuum interrupters (VI) are often tested according to the IEC standard 62271-100. This standard specifies a series of current interruption tests to verify the operation of the circuit breaker under a variety of different failure conditions. The IEC 62271-100 standard will be updated at the end of 2016 to include additional new tests for medium voltage circuit breakers, designed to verify successful interruption in electrical power systems with an effectively earthed neutral. In the current version of the standard, three-phase tests are performed in the non-effectively earthed neutral case. This situation is referred to as kpp = 1.5, where kpp is the first-pole-to-clear factor. In the updated standard, additional three-phase tests are performed with an effectively earthed neutral, referred to as kpp = 1.3. This setup leads to higher stress on the second phase to clear. In order to evaluate the effect of the new tests, two different VI designs, in regular commercial use which previously passed the 62271-100 standard, were tested according to the new requirements. One VI style was an axial magnetic field (AMF) design for 40.5kV/31.5kA, and the other a radial magnetic field (RMF) design for 17.5kV/31.5kA. Both VI designs were first tested with symmetric and asymmetric close/open operations for kpp = 1.5. The VI's were then tested with symmetric operations (T100s) and a large number of asymmetric operations (T100a) with kpp = 1.3. Both VI types passed these test duties, which greatly exceeded the requirements of the updated IEC 62271-100. This performance indicates that well-designed VI's that pass the current version of IEC 62271-100 will also be able to pass the new kpp = 1.3 tests for systems with an effectively earthed neutral.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"37 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":"126750129","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

Fast video registration of transition processes from diffuse mode to anode spot mode in high-current arc with copper-chromium electrodes 铜铬电极在大电流电弧中从漫射模式到阳极点模式过渡过程的快速视频配准

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748756

S. Popov, A. Schneider, V. Lavrinovich, A. Batrakov, S. Gortschakow, A. Khakpour

{"title":"Fast video registration of transition processes from diffuse mode to anode spot mode in high-current arc with copper-chromium electrodes","authors":"S. Popov, A. Schneider, V. Lavrinovich, A. Batrakov, S. Gortschakow, A. Khakpour","doi":"10.1109/DEIV.2016.7748756","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748756","url":null,"abstract":"Transition process from a diffuse to anode spot mode in high-current vacuum arc discharge with Cu-Cr electrodes has been studied experimentally. Images of the arc were recorded with a frequency of about 25000 frames per second synchronously with the acquisition of current and voltage waveforms. Experiments clarify that after the current reaches a certain threshold value (4 to 5 kA for bulk-type, 2-cm electrodes), the arc discharge passes from diffuse mode to the mode with anode spot and voltage increased by ~20 V. In this mode, bright anode jet appears; cathode micro spots are reduced in number and grouped in front of the anode jet with the formation the cathode macro spot. In such a threshold regime, the discharge can change to the anode-spot mode and back to diffuse mode many times, with transition time in the microsecond range. With increasing current amplitude, anode spot mode becomes more stable, cathode and anode macro-jets are coming closer together forming a quasi-continuous radially-constricted discharge channel. The constriction of discharge is accompanied by increasing power density on both electrodes. In the case of TMF type electrodes, the constricted plasma channel moves azimuthally along the electrode lobe.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"34 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":"115054536","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

Method to determine rotation velocity of constricted vacuum arcs driven by transverse magnetic field 测定横向磁场驱动的压缩真空电弧旋转速度的方法

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI: 10.1109/DEIV.2016.7748709

Hui Ma, Zaiqin Zhang, S. Ferrari, Jianhua Wang, Yingsan Geng, Zhiyuan Liu

{"title":"Method to determine rotation velocity of constricted vacuum arcs driven by transverse magnetic field","authors":"Hui Ma, Zaiqin Zhang, S. Ferrari, Jianhua Wang, Yingsan Geng, Zhiyuan Liu","doi":"10.1109/DEIV.2016.7748709","DOIUrl":"https://doi.org/10.1109/DEIV.2016.7748709","url":null,"abstract":"The objective of this paper is to propose a new method to quantitatively determine the arcing rotation velocity of the constricted vacuum arc driven by a transverse magnetic field (TMF). This method is based on a split anode and TMF cathode configuration system. Experiments were set in a demountable vacuum chamber. Both electrodes have a contact diameter of 60 mm. The anode surface was divided into four regions: one central region (Area I) and three symmetrically peripheral annular regions (Area II, III and IV). The currents of the four areas on the anode contact were measured using four Rogowski coils situated outside the vacuum chamber. The observed arc modes were recorded by a high-speed CCD video camera. The rotation velocity of the constricted arc column is calculated from the arc current waveforms of the four split areas. The experimental results indicate that the maximum speed is approximately 471 m/s with the arc current of 16 kA rms. The results also reveal the corresponding anode current distribution characteristics under TMF in different arc stages during the arcing time.","PeriodicalId":296641,"journal":{"name":"2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)","volume":"9 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":"122761599","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: 5