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Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986最新文献

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Dielectric analysis of the cure of thermosetting epoxy/amine systems 热固性环氧/胺体系固化的介电分析
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-15 DOI: 10.1002/PEN.760290510
N. F. Sheppard, S. Senturia
{"title":"Dielectric analysis of the cure of thermosetting epoxy/amine systems","authors":"N. F. Sheppard, S. Senturia","doi":"10.1002/PEN.760290510","DOIUrl":"https://doi.org/10.1002/PEN.760290510","url":null,"abstract":"The use of dielectric measurements to monitor the cure of thermosetting polymers dates back to the pioneering work of Kienle and Race in 1934 [1]; a review of the literature may be found in [2]. In 1966, Olyphant [3] recognized that the changes in the dielectric properties during cure are related to the change in the glass transition temperature that accompanies the curing reaction. A better understanding of this relationship would be of considerable value in the application of dielectric measurements to the processing of epoxies.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133385863","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: 40
Complex permittivity measurements of thin films using microdielectrometry 用微介电法测量薄膜的复介电常数
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726484
M. Zaretsky, J. Melcher
{"title":"Complex permittivity measurements of thin films using microdielectrometry","authors":"M. Zaretsky, J. Melcher","doi":"10.1109/CEIDP.1986.7726484","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726484","url":null,"abstract":"Classical dielectrometry illustrates how important information concerning the physical properties and state of a media can be obtained from the electrical frequency response. The modal approach to dielectrometry described here not only extracts its information from the control of the temporal frequency, but also from the imposition of a spatial periodicity as well. In this “imposed ω-k” technique, the medium is excited at the temporal (angular) frequency ω by means of an interdigital electrode structure having a spatial periodicity length X = 2π/k and hence a dominant wavenumber k.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124994152","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: 11
Lightning impulse electric strength of insulating oils in power transformers 电力变压器绝缘油的雷击强度
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726459
O. Honorati, C. Mazzetti, M. Pompili
{"title":"Lightning impulse electric strength of insulating oils in power transformers","authors":"O. Honorati, C. Mazzetti, M. Pompili","doi":"10.1109/CEIDP.1986.7726459","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726459","url":null,"abstract":"Dielectric properties of traditional mineral oils are normally excellent, even though the main disadvantage of being inflammable.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125821080","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
Partial discharge pulse height distributions in presence of insulating layers and bubbles 存在绝缘层和气泡时的局部放电脉冲高度分布
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726479
P. A. yon Guggenberg, C. Cooke
{"title":"Partial discharge pulse height distributions in presence of insulating layers and bubbles","authors":"P. A. yon Guggenberg, C. Cooke","doi":"10.1109/CEIDP.1986.7726479","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726479","url":null,"abstract":"Partial discharges (PDs) are a useful diagnostic in high voltage apparatus, and their measurement has been greatly improved with the application of advanced pulse height measurement equipment. The interpretation of PD signatures is important to insulation analysis in highly stressed apparatus such as power transformers, cables, and capacitors.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123035513","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 study of SF6/N2 mixtures with 0.1% to 20% SF6 content for rod-plane GPS with both positive and negative voltages SF6含量为0.1% ~ 20%的SF6/N2混合物在正负电压下对棒面GPS的雷击研究
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726463
D. Raghavender, M. Naidu
{"title":"Lightning impulse study of SF6/N2 mixtures with 0.1% to 20% SF6 content for rod-plane GPS with both positive and negative voltages","authors":"D. Raghavender, M. Naidu","doi":"10.1109/CEIDP.1986.7726463","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726463","url":null,"abstract":"Lightning impulse (1.2/50μs) study of both positive and negative breakdown voltage characteristics of SF6/N2 mixtures with 0.1% to 20% SF6 content for rod-plane gaps over a large range of gap spacings are presented. The range of parameters investigated vary from 5 mm to 100 mm in gap spacings, from 1 to 5 bar (0.1 to 0.3 MPa) in gas pressure. Increase in the 30% breakdown voltage (V50) has been observed to be uniform over the pressure range 1 to 4 bar for both polarity voltages, and under negative voltages, the change is significant only at pressures greater than 4 bar. It has been also observed, that the characteristic ‘pressure-effect’ is not well defined in these gas mixtures and can be seen only over a limited range of experimental conditions (e.g. at 40 mm and 80 mm negative rod-plane gaps).","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128570566","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
Low-frequency dispersion in semi-insulating systems 半绝缘系统中的低频色散
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726425
A. K. Jonscher
{"title":"Low-frequency dispersion in semi-insulating systems","authors":"A. K. Jonscher","doi":"10.1109/CEIDP.1986.7726425","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726425","url":null,"abstract":"At sufficiently high temperatures all insulators tend to become semi-insulating due to increasing numbers of slowly mobile charges. The dielectric properties of such materials show a characteristic \"signature\" called low-frequency dispersion (LFD) differing drastically from direct current (dc) conduct in parallel with a capacitor and also from the Maxwell-Wagner process (MW) which in effect represents a series combination of a resistor Ro and a capacitor C0.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129212306","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
Surface treatments to reduce electrochemical corrosion on semiconducting glazed insulators 表面处理以减少半导体釉面绝缘子的电化学腐蚀
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726469
L. Egiziano, G. Lupò, V. Tucci, G. Mascolo
{"title":"Surface treatments to reduce electrochemical corrosion on semiconducting glazed insulators","authors":"L. Egiziano, G. Lupò, V. Tucci, G. Mascolo","doi":"10.1109/CEIDP.1986.7726469","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726469","url":null,"abstract":"The many advantages achievable by the use of semiconducting-glazed (SG) insulators in high voltage transmission lines have been extensively examined in the literature /1,2/. Unfortunately, these insulators exhibit a short lifetime, especially when used in heavily polluted areas. Their degradation has to be ascribed mainly to the rectifying effect arising at the interface between the wet contaminant deposit and the semiconducting layer: even with optimal glaze formulation and manufacture, the unidirectional component of the surface current produces the electrochemical corrosion of the glaze, more evidenced where microstructural defects (bubbles, craters, etc.) are present /3/.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131988522","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
Water permeation through electrically damaged polymers 水通过电损伤的聚合物渗透
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726478
G. Gordon, M. Shaw
{"title":"Water permeation through electrically damaged polymers","authors":"G. Gordon, M. Shaw","doi":"10.1109/CEIDP.1986.7726478","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726478","url":null,"abstract":"The exposure of dielectrics to moisture in the presence of an electrical field can result in the growth of water trees possibly leading to premature failure (1). Although investigated extensively, the mechanisms of initiation and growth of water trees remain unclear. In relation to this, the mode of water transport through treed polymeric materials is a subject of considerable controversy. It has been suggested that the voids constituting the water trees are interconnected by channels which develop under the influence of electrical stress and collapse due to surface tension once the field is removed (2). If this is the case, one must consider the possibility that the observed stress dependence of the rate of water-tree growth is controlled by the effect of the stress of the rate of water transport through a damaged dielectric. To date, all work dealing with fluid transport studies show no indication of the existence of these channels. However studies were carried out either with undamaged materials (3) or without an applied field (4,5).","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133068714","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
Flow electrification in transformer oil/cellulosic systems 变压器油/纤维素系统中的流动电气化
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726452
J. Melcher, D. Lyon, M. Zahn
{"title":"Flow electrification in transformer oil/cellulosic systems","authors":"J. Melcher, D. Lyon, M. Zahn","doi":"10.1109/CEIDP.1986.7726452","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726452","url":null,"abstract":"Liquids are commonly used in power apparatus to both transfer heat and withstand high electric stress. The combination of charge separation at interfaces between the moving oil and boundaries and forced convection can give rise to the generation of electric fields. Either alone, or in consort with the fields imposed by energization of the equipment, these can contribute to insulation failure. Examples include freon cooled static power conditioning equipment and oil cooled transformers. Both to ensure reliable operation of existing equipment and to guide in the development of the next generation of power apparatus, it is desirable that flow electrification be reduced to an engineering science.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133732628","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: 6
Electrical breakdown strength of polypropylene film oil-immersed under combined AC-DC voltage 交直流复合电压下浸油聚丙烯膜的击穿强度
Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986 Pub Date : 1986-11-01 DOI: 10.1109/CEIDP.1986.7726493
S. Grzybowski, E. Kuffel
{"title":"Electrical breakdown strength of polypropylene film oil-immersed under combined AC-DC voltage","authors":"S. Grzybowski, E. Kuffel","doi":"10.1109/CEIDP.1986.7726493","DOIUrl":"https://doi.org/10.1109/CEIDP.1986.7726493","url":null,"abstract":"The paper presents data on electrical breakdown strength and partial discharge inception voltage of polypropylene film oil-immersed under a.c., d.c., and superimposed a.c., upon d.c. voltages, conditions that may exist in HVDC converter stations equipment. In the latter case the ratio of the a.c. to d.c. voltage components (p = Va.c./Vd.c.) was varied between the limits of 0.2 ≤ d ≤ 10. The results obtained under combined a.c. plus d.c. voltages follow closely an expression which relates the breakdown voltage to the sum of arc tangent and arc cotangent function of the parameter p. The partial discharge inception voltage remained independant of the parameter p.","PeriodicalId":354533,"journal":{"name":"Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1986","volume":"75 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124277910","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: 7
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