Conference on Electrical Insulation and Dielectric Phenomena,最新文献

Exploration of self-produced vacuum ultraviolet radiation from dielectric surface flashover at atmospheric pressure 大气压下介质表面闪络自产真空紫外线辐射的探索

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232719

G. Laity, A. Fierro, L. Hatfield, A. Neuber

{"title":"Exploration of self-produced vacuum ultraviolet radiation from dielectric surface flashover at atmospheric pressure","authors":"G. Laity, A. Fierro, L. Hatfield, A. Neuber","doi":"10.1109/CEIDP.2011.6232719","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232719","url":null,"abstract":"This paper describes recent experiments to study selfproduced vacuum ultraviolet (VUV) emission from pulsed atmospheric plasma structures. While it has been classically believed that photo-ionization plays a significant role on plasma generation during fast timescales (i.e. streamers), the exact role of VUV radiation (energy greater than 7 eV) has only recently been explored and is currently an area of interest for the development of high power devices in the aerospace community. Since VUV emission is heavily absorbed by molecular oxygen and most optical materials, the direct observation of VUV radiation produced by atmospheric pressure plasmas is challenging. Experiments at Texas Tech University were performed with multiple vacuum monochromators, custom designed VUV transparent optical instruments, VUV sensitive intensified CCD and photomultiplier time-resolved diagnostics, and nanosecondtimescale electrical probes of the plasma. Previous studies were limited due to the non-linearity of the focusing optics used for VUV transmission, and thus the current experiment was designed to minimize chromatic abberation of recorded emission in the VUV regime of interest (115 – 135 nm). Quantitative observation of VUV emission from surface flashover in air revealed that the majority of emission is due to radiation from atomic oxygen and nitrogen in the wavelength range 130 – 135 nm, which has been confirmed by spectral calculation for an estimated Boltzmann temperature of 10 eV. High resolution spectral measurements in the range 115 – 130 nm also led to observation of various impurities along the surface, which were only observable due to the upgraded focusing system. Finally, time resolved measurements showed that the earliest VUV emission occurs during the streamer phase, where the recorded signal-to-noise ratio of the observed emission has been significantly increased due to more efficient optical diagnostics.","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"18 1","pages":"563-566"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91397853","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

Influence of the cohesive energy density of polymers and of the nature of metal-polymer interface on the contact charging of polymers 聚合物的内聚能密度和金属-聚合物界面性质对聚合物接触充电的影响

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69560

J. Crine, A. Vijh

引用次数: 0

Space charge induced in stressed polyethylene 应力聚乙烯中诱导的空间电荷

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69555

N. Hozumi, J. Tanaka, A. De Reggi, N. Nagusrinivas

引用次数: 10

Three-dimensional dielectric imaging by microwave inverse scattering with resolution unlimited by wavelength 微波逆散射三维介质成像，分辨率不受波长限制

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69525

W. W. Guo, T. Guo

引用次数: 11

Thermally stimulated discharge currents in high temperature dielectrics 高温电介质中的热激放电电流

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69558

G. Raju

引用次数: 2

Radiation-induced electrical insulator breakdown 辐射引起的电绝缘体击穿

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69548

A. Frederickson, P. McGrath, P. Leung

{"title":"Radiation-induced electrical insulator breakdown","authors":"A. Frederickson, P. McGrath, P. Leung","doi":"10.1109/CEIDP.1989.69548","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69548","url":null,"abstract":"A mechanism is determined for the induction of electrical breakdown in thick solid insulating material exposed to high-energy particles or photons. The authors have found a mechanism where common radiation levels, greater than on the order of 100 rad/h, will induce breakdown in insulators under typical high levels of applied electric field stress. In the experiments reported here, an attempt was made to determine if beam-induced discharges could couple with an applied (battery or power supply) electric stress and result in full insulator failure. Without applied voltages, the discharges were transient and the insulators recovered their properties within microseconds, even though the beam continued after the discharge. A model explaining the experimental results is developed. It is seen that peculiar combinations of geometry and radiation are required in order to produce radiation-initiated breakdown. The radiation must induce high fields over a small volume of the insulator so that the normal bias levels can invert the space-charge-induced fields through the rest of the dielectric. Also, before it quenches, the streamer must propagate fully through the insulator. These conditions can be used to encourage the occurrence of the breakdown, or one can choose geometries to avoid the problem.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"13 1","pages":"210-217"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81378524","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

Impulse waveform effects on negative point breakdown phenomena in SF/sub 6/ 脉冲波形对SF/sub - 6/负点击穿现象的影响

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69527

J.Y. Thalji, J. K. Nelson

{"title":"Impulse waveform effects on negative point breakdown phenomena in SF/sub 6/","authors":"J.Y. Thalji, J. K. Nelson","doi":"10.1109/CEIDP.1989.69527","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69527","url":null,"abstract":"The authors investigate the impulse waveform effects on the initiation, propagation, and stabilization of gas discharges over a wide range of pressures in SF/sub 6/. Impulses are generated by a Fletcher type generator. By changing the internal pulse forming components, 0.0075/80- and 0.6/80- mu s surges can be generated and applied to a 0.25-mm-radius stainless steel point forming a 5-mm point/plane SF/sub 6/ gap. Discharge development is recorded by a collimated photomultiplier with quartz optics forward focused to view the whole gap. Extensive studies of the patterns of light emission have indicated that three distinct modes of discharge development exist. Although all of the modes identified are present at 0.4 MPa under a lightning surge application, the mode incidence is very different, the preponderance depending both on pressure and on risetime. Mode A is always present and results in breakdown in the majority of cases for both fast and slow pulse application. However, the stabilized mode (Mode B) is highly dependent on pressure and only present for the slow rising impulses. Mode C is present only at high pressure (above 0.3 MPa) and occurs independent of impulse risetime.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"17 1","pages":"81-86"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81943700","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: 3

A new approach to the electric aging of dielectrics 电介质电老化的新方法

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69540

J. Crine, J. Parpal, C. Dang

引用次数: 30

A computer simulation of the interaction between randomly distributed dipoles 随机分布的偶极子之间相互作用的计算机模拟

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69566

H. Kliem, P. Fuhrmann

引用次数: 3

Effect of mist formation in vapor-mist dielectrics on breakdown 气雾介质中雾的形成对击穿的影响

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69592

S. Yajima, M. Sone, H. Mitsui, S. Hirabayashi

引用次数: 3