Pub Date : 2006-02-15DOI: 10.2355/ISIJINTERNATIONAL.46.335
H. Takahashi, T. Nakamura, M. Sugimoto, K. Takeda, M. Usio, M. Tanaka
The cathode spots of a vacuum arc have smart properties such as preferential attack against oxides and their selective removal. Recently cathode spots have been used for cleaning metal surface before the application of coating or prior to surface modification. The effects of pressure on the cleaning action of the cathode spots were investigated in a wide pressure range from 10 to 2000 Pa of insert atmosphere. Experiments were carried out by using hot rolled steel plates, the surfaces of which were covered with thick oxide of 5-10 μm. Experimental observation revealed the following results: (1) The vacuum arc phenomenon of cathode spots is confirmed even under a pressure as high as 20000 Pa. (2) The number of cathode spots on the oxide surface increased with the increase of pressure in the range of 10 ˜2000 Pa. (3) The removal rate of oxide decreased with the increase of pressure. AI pressures higher than 10000 Pa, the cleaning action (oxide removal) by the cathode spots was only negligibly observed. (4) The cathode spot energy density may possibly decrease with an increase in pressure. (5) The higher the pressure increase, the smaller area the movement of the cathode spots was restricted to. The cleaning area decreased with the increase of pressure.
{"title":"Effect of pressure on the behavior of cathode spots in oxide removal by are discharge","authors":"H. Takahashi, T. Nakamura, M. Sugimoto, K. Takeda, M. Usio, M. Tanaka","doi":"10.2355/ISIJINTERNATIONAL.46.335","DOIUrl":"https://doi.org/10.2355/ISIJINTERNATIONAL.46.335","url":null,"abstract":"The cathode spots of a vacuum arc have smart properties such as preferential attack against oxides and their selective removal. Recently cathode spots have been used for cleaning metal surface before the application of coating or prior to surface modification. The effects of pressure on the cleaning action of the cathode spots were investigated in a wide pressure range from 10 to 2000 Pa of insert atmosphere. Experiments were carried out by using hot rolled steel plates, the surfaces of which were covered with thick oxide of 5-10 μm. Experimental observation revealed the following results: (1) The vacuum arc phenomenon of cathode spots is confirmed even under a pressure as high as 20000 Pa. (2) The number of cathode spots on the oxide surface increased with the increase of pressure in the range of 10 ˜2000 Pa. (3) The removal rate of oxide decreased with the increase of pressure. AI pressures higher than 10000 Pa, the cleaning action (oxide removal) by the cathode spots was only negligibly observed. (4) The cathode spot energy density may possibly decrease with an increase in pressure. (5) The higher the pressure increase, the smaller area the movement of the cathode spots was restricted to. The cleaning area decreased with the increase of pressure.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115587160","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 : 2006-02-13DOI: 10.1109/TDEI.2006.1593399
S. Sato, H. Koga
We have discussed the influence of metal vapor contamination for ceramic surface of vacuum interrupters (VIS) on surface flashover characteristics. Firstly, using the metal vapor emission fmm CuCr contacts, we produced disk-shape alumina (A1203,) ceramic samples with surface resistivity (p) of 102-1015 Ω, and measured their surface flashover voltages. It was identified that lightening impulse flashover voltage decreased as p reduced and that both the conditioning effect and scattering of the flashover voltage became small when pwas below 1012 Ω. Secondly, we produced two types of VIS, with CuCr spiral contacts and CuCr axial magnetic field contacts respctively, to conduct forty times of short-circuit current interruptions with 20-40 kArms. It was specified that p f o r the ceramic of the VI with spiral contacts reduced down to 104 Ω, and that breakdown vokage between terminals of the VI also decreased. pand breakdown voltage for the VI with AMF contacts did not decreased.
{"title":"Flashover voltage of alumina ceramic contaminated by metal vapor in vacuum interrupters","authors":"S. Sato, H. Koga","doi":"10.1109/TDEI.2006.1593399","DOIUrl":"https://doi.org/10.1109/TDEI.2006.1593399","url":null,"abstract":"We have discussed the influence of metal vapor contamination for ceramic surface of vacuum interrupters (VIS) on surface flashover characteristics. Firstly, using the metal vapor emission fmm CuCr contacts, we produced disk-shape alumina (A1203,) ceramic samples with surface resistivity (p) of 102-1015 Ω, and measured their surface flashover voltages. It was identified that lightening impulse flashover voltage decreased as p reduced and that both the conditioning effect and scattering of the flashover voltage became small when pwas below 1012 Ω. Secondly, we produced two types of VIS, with CuCr spiral contacts and CuCr axial magnetic field contacts respctively, to conduct forty times of short-circuit current interruptions with 20-40 kArms. It was specified that p f o r the ceramic of the VI with spiral contacts reduced down to 104 Ω, and that breakdown vokage between terminals of the VI also decreased. pand breakdown voltage for the VI with AMF contacts did not decreased.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117341816","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418635
V. Saenko, A. Borisenko
Classical and new types of discharge gaps, discharge plasma parameters , the magnitudes of near-electrode potential jumps, the use of discharges in plasma evaporators and plasma spraying of dielectrics have been described. The main characteristics of discharges have been explained. It is shown that the discharges with the evaporation of anode in vacuum can replace vacuum-arc discharges in the processes hindered by the working substance drops.
{"title":"Discharges with the evaporation of anode substance in vacuum","authors":"V. Saenko, A. Borisenko","doi":"10.1109/DEIV.2004.1418635","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418635","url":null,"abstract":"Classical and new types of discharge gaps, discharge plasma parameters , the magnitudes of near-electrode potential jumps, the use of discharges in plasma evaporators and plasma spraying of dielectrics have been described. The main characteristics of discharges have been explained. It is shown that the discharges with the evaporation of anode in vacuum can replace vacuum-arc discharges in the processes hindered by the working substance drops.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128299528","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418586
A. Emelyanov, E. Emelyanova, T. Safonova, I. Serikov
High-voltage conditioning efficiency of vacuum gap electrodes at the electric field macrointensity, 1.5.107⩽E01.310V/m , by pulses with duration equal to the breakdown delay time is estimated. It's shown that pulse regimes efficiency for increasing the vacuum insulation breakdown strength rises with duration decrease at appropriate intensity increase on cathode and can essential exceed dc conditioning efficiency. Limiting results correspond to the conditioning with the subnanosecond pulses at the macrointensity, E0˜1010V/m, created in micron gaps.
估计了真空间隙电极在电场宏观强度为1.5.107±e1.310 v /m时，脉冲持续时间等于击穿延迟时间时的高压调节效率。结果表明，在阴极上适当增加脉冲强度时，脉冲区提高真空绝缘击穿强度的效率随持续时间的减小而增大，并可基本超过直流调节效率。极限结果对应于在微米间隙中产生的亚纳秒脉冲的宏观强度，E0 ~ 1010V/m。
{"title":"Optimal conditions efficiency for pulse increasing the breakdown strength of vacuum insulation","authors":"A. Emelyanov, E. Emelyanova, T. Safonova, I. Serikov","doi":"10.1109/DEIV.2004.1418586","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418586","url":null,"abstract":"High-voltage conditioning efficiency of vacuum gap electrodes at the electric field macrointensity, 1.5.10<sup>7</sup>⩽E<sub>0</sub>1.3<sup>10V/m , by pulses with duration equal to the breakdown delay time is estimated. It's shown that pulse regimes efficiency for increasing the vacuum insulation breakdown strength rises with duration decrease at appropriate intensity increase on cathode and can essential exceed dc conditioning efficiency. Limiting results correspond to the conditioning with the subnanosecond pulses at the macrointensity, E<sub>0</sub>˜10<sup>10</sup>V/m, created in micron gaps.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121219667","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418590
Suharyanto, S. Michizono, Y. Yamano, Y. Saito, S. Kobayashi
Secondary electron emission (SEE) coefficients of alumina, sapphire; Si02, and MgO were measured by using a SEM with short-pulsed electron beam under room and high temperatures. An appreciable reduction in the SEE coefficients with increasing temperature was confirmed, except for sapphire. In addition, it was found that at room and high temperature SEE coefficients of alumina increased with purity and grain size.
{"title":"Secondary electron emission of dielectric materials under high emperature condition","authors":"Suharyanto, S. Michizono, Y. Yamano, Y. Saito, S. Kobayashi","doi":"10.1109/DEIV.2004.1418590","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418590","url":null,"abstract":"Secondary electron emission (SEE) coefficients of alumina, sapphire; Si02, and MgO were measured by using a SEM with short-pulsed electron beam under room and high temperatures. An appreciable reduction in the SEE coefficients with increasing temperature was confirmed, except for sapphire. In addition, it was found that at room and high temperature SEE coefficients of alumina increased with purity and grain size.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131526357","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418621
E. Azizov, A. Emelyanov, V. Yagnov
Abslracf It is known, that alongside with vacuum lighting protectors large throughput capacity on a current have the dischargers operating a sliding creeping discharge of dielectric medium. I n tendered activity the voltage breakdown and formation of turn electric discharge in a zone of tenacious turbulent stirring of a buoyant jet of water driving in a direction crosswise of an axis of an clcctrode system is studied. The border zone of a spray actually represents biphasic medium with concentration microbubbles of a cavitation parentage of up to 107 cm-3, therefore in her there are favourable conditions for a breeding o f electrons. By it the considwed breakdown essentially differs from a low-voltage breakdown in a reposing liquid. Tlie abnormal properties of electric discharge in a buoyant jet show both at the stage of ignition, and at sustained combustion. So the threshold voltages of a breakdown are reduced in some times already at speeds of a spray 30 mis, simultaneously approximately duration o f the prebreakdown stage i s reduced to one two order. At arc stage of combustion discharge there is a developed emitting surface, a depth of a plasma sheath about I mm. The change on
{"title":"Voltage breakdown and formation film discharge along a surface of a water jet","authors":"E. Azizov, A. Emelyanov, V. Yagnov","doi":"10.1109/DEIV.2004.1418621","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418621","url":null,"abstract":"Abslracf It is known, that alongside with vacuum lighting protectors large throughput capacity on a current have the dischargers operating a sliding creeping discharge of dielectric medium. I n tendered activity the voltage breakdown and formation of turn electric discharge in a zone of tenacious turbulent stirring of a buoyant jet of water driving in a direction crosswise of an axis of an clcctrode system is studied. The border zone of a spray actually represents biphasic medium with concentration microbubbles of a cavitation parentage of up to 107 cm-3, therefore in her there are favourable conditions for a breeding o f electrons. By it the considwed breakdown essentially differs from a low-voltage breakdown in a reposing liquid. Tlie abnormal properties of electric discharge in a buoyant jet show both at the stage of ignition, and at sustained combustion. So the threshold voltages of a breakdown are reduced in some times already at speeds of a spray 30 mis, simultaneously approximately duration o f the prebreakdown stage i s reduced to one two order. At arc stage of combustion discharge there is a developed emitting surface, a depth of a plasma sheath about I mm. The change on","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132579344","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418605
H. Okubo, F. Miyazaki, Y. Inagawa, K. Kato, M. Sakaki, H. Ichikawa
In this paper, we discussed the breakdown (BD) area of electrode on conditioning characteristics under non-uniform electric field in vacuum. Negative standard lightning impulse voltage was applied between rod and plane electrodes made of Cu-Cr and stainless steel for different tip radii and gap lengths. Experimental results revealed how the electrode area of BD and the BD field strength depend on the electric field distribution and the electrode materials in the conditioning process. As a result, we quantitatively clarified the relationship between electrode area of BD and conditioning mechanism under non-uniform electric field in vacuum.
{"title":"Electrode area of breakdown depending on conditioning mechanism under non-uniform electric field in vacuum","authors":"H. Okubo, F. Miyazaki, Y. Inagawa, K. Kato, M. Sakaki, H. Ichikawa","doi":"10.1109/DEIV.2004.1418605","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418605","url":null,"abstract":"In this paper, we discussed the breakdown (BD) area of electrode on conditioning characteristics under non-uniform electric field in vacuum. Negative standard lightning impulse voltage was applied between rod and plane electrodes made of Cu-Cr and stainless steel for different tip radii and gap lengths. Experimental results revealed how the electrode area of BD and the BD field strength depend on the electric field distribution and the electrode materials in the conditioning process. As a result, we quantitatively clarified the relationship between electrode area of BD and conditioning mechanism under non-uniform electric field in vacuum.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114993926","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418588
A. Emelyanov, E. Emelyanova, T. Safonova, I. Serikov
Optimal conditions of high-voltage pulse Conditioning at durations equal to the breakdown delay time in vacuum are investigated. New methods and criterions of cathode initiation estimation in pulse regime valid for cathodes of arbitrary form are presented. Experimental check on coaxial copper electrodes (d=0.2mm; S=2500mm2) has confirmed correctness of presented methods.
{"title":"Vacuum breakdown cathode initiation estimation in pulse regime","authors":"A. Emelyanov, E. Emelyanova, T. Safonova, I. Serikov","doi":"10.1109/DEIV.2004.1418588","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418588","url":null,"abstract":"Optimal conditions of high-voltage pulse Conditioning at durations equal to the breakdown delay time in vacuum are investigated. New methods and criterions of cathode initiation estimation in pulse regime valid for cathodes of arbitrary form are presented. Experimental check on coaxial copper electrodes (d=0.2mm; S=2500mm2) has confirmed correctness of presented methods.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117190378","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418665
R. Bischoff, K. Frank, I. Petzenhauser, Y. Korolev, O. B. Frants, V. G. Geyman, N. Landl, I. A. Shemyakin
The paper deals with the investigation of the fast electron beams that form in the high-current pseudospark discharge at different stages of its development. Three short-duration peak of the beam current at the discharge axis have been revealed. The physical reasons for appearing these peaks of the beam are discussed.
{"title":"Temporal structure of the fast electron beam at the stage of formation of the pseudospark discharge with external triggering","authors":"R. Bischoff, K. Frank, I. Petzenhauser, Y. Korolev, O. B. Frants, V. G. Geyman, N. Landl, I. A. Shemyakin","doi":"10.1109/DEIV.2004.1418665","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418665","url":null,"abstract":"The paper deals with the investigation of the fast electron beams that form in the high-current pseudospark discharge at different stages of its development. Three short-duration peak of the beam current at the discharge axis have been revealed. The physical reasons for appearing these peaks of the beam are discussed.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"36 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116347556","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 : 2004-09-27DOI: 10.1109/DEIV.2004.1418618
Y. Tsukamoto, Y. Yamano, S. Kobayashi, Y. Saito
Flashover along the surface of a solid insulator (surface flashover) prevents minimizing the size of vacuum devices It has been considered that the emission ofelectrons from the cathode hiple junction won is the first step of initiating the surface flashover, subsequent gas desorption from insulator surface stimulated by elechon impact is the second stop and finally the surface flashover occurs in the desorbed gases In addition it has been recognized that conditioning treatment by repetitive surface flashover cleans insulator surface and brings higher flashover voltage. Therefore removal of adsorbed gas= and surface contaminants may improve surface flashover voltage. In this expetiment, vacuum heat treatment (about 465 degrees Celsius) for Alumina samples was employed as a means of removal of adsorbed gases and surface contaminants. AAer heat treatment, repetitive flashover test was conducted in vacuum without the expsure.of sample to atmosphere Flashover voltages with and without heat treatment were compared. As a mull, flashover voltage for the sample with heat treatment was higher than that for without heat treatment In particular, an appreciable improvement of first flashover voltage was confirmed for heat treatment samples significant conditioning eNwt for the sample with heat treatment was obtained as well. In addition the dependence of the flashover voltage on the purity of aluminas with heat treatment was clalified.
{"title":"Effect of in situ heat treatment on surface flashover characteristic and surface condition of alumina in vacuum","authors":"Y. Tsukamoto, Y. Yamano, S. Kobayashi, Y. Saito","doi":"10.1109/DEIV.2004.1418618","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418618","url":null,"abstract":"Flashover along the surface of a solid insulator (surface flashover) prevents minimizing the size of vacuum devices It has been considered that the emission ofelectrons from the cathode hiple junction won is the first step of initiating the surface flashover, subsequent gas desorption from insulator surface stimulated by elechon impact is the second stop and finally the surface flashover occurs in the desorbed gases In addition it has been recognized that conditioning treatment by repetitive surface flashover cleans insulator surface and brings higher flashover voltage. Therefore removal of adsorbed gas= and surface contaminants may improve surface flashover voltage. In this expetiment, vacuum heat treatment (about 465 degrees Celsius) for Alumina samples was employed as a means of removal of adsorbed gases and surface contaminants. AAer heat treatment, repetitive flashover test was conducted in vacuum without the expsure.of sample to atmosphere Flashover voltages with and without heat treatment were compared. As a mull, flashover voltage for the sample with heat treatment was higher than that for without heat treatment In particular, an appreciable improvement of first flashover voltage was confirmed for heat treatment samples significant conditioning eNwt for the sample with heat treatment was obtained as well. In addition the dependence of the flashover voltage on the purity of aluminas with heat treatment was clalified.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126943495","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}
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