1980 IEEE International Conference on Electrical Insulation最新文献_第6页

Space charge probing with electron beam 电子束空间电荷探测

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470904

D. Tong

引用次数: 2

The conduction current and breakdown under normal conditions and under forced circulation of insulating liquids 在正常条件下和绝缘液体强制循环下的传导电流和击穿

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470917

Hamdi R. Syla

引用次数: 0

Solventless U.V. cured epoxy coating for generator stator laminations 发电机定子片用无溶剂uv固化环氧涂料

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470883

E. Boulter, L. Squillacioti, R. F. Zopf, G. B. Peters

{"title":"Solventless U.V. cured epoxy coating for generator stator laminations","authors":"E. Boulter, L. Squillacioti, R. F. Zopf, G. B. Peters","doi":"10.1109/ICEI.1980.7470883","DOIUrl":"https://doi.org/10.1109/ICEI.1980.7470883","url":null,"abstract":"A solventless ultraviolet curable epoxy coating for generator stator laminations was developed to achieve major energy conservation and assure uninterrupted production during periods of natural gas curtailment. The resultant cured stator coating demonstrates improved mechanical, electrical and thermal perfomrance over the present solvent based thermally cured coating. This paper examines the mechanical, electrical and thermal requirements of the application and reviews the processing advantages gained with solventless ultraviolet cured epoxy coatings. A review of the chemistry will provide the building blocks for the development of the final coating properties. Mechanical properties, including surface coefficient of friction, flexibility and compression creep will be discussed, highlighting the testing techniques developed to simulate service conditions. The improved electrical performance achieved with this solventless ultraviolet curable epoxy coating will be compared to the basic cured coating properties and specifics of coating processing. Limited thermal evaluation of the coating indicates improved high temperature performance which may make this coating a candidate for applications with higher temperatures than normally experienced with generator stator laminations. Finally, the pilot line experience with coating will be presented, along with the estimate of reductions in pollution emissions achieved.","PeriodicalId":113059,"journal":{"name":"1980 IEEE International Conference on Electrical Insulation","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114930646","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

Surface discharges on outdoor polymeric insulation 室外聚合物绝缘材料表面放电

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470880

H. Kärner, H. Wehinger

引用次数: 7

The dynamics of electrical breakdown in liquid hydrocarbons, v. light emission processes 液态碳氢化合物的电击穿动力学，v.发光过程

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/TEI.1982.298458

E. Forster, P. Wong

引用次数: 49

The electrical properties of anhydride-cured epoxy resin insulation materials 酸酐固化环氧树脂绝缘材料的电性能

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470893

J. D. Smith, A. Bennett

{"title":"The electrical properties of anhydride-cured epoxy resin insulation materials","authors":"J. D. Smith, A. Bennett","doi":"10.1109/ICEI.1980.7470893","DOIUrl":"https://doi.org/10.1109/ICEI.1980.7470893","url":null,"abstract":"Anhydride-cured epoxy resins are widely used to insulate electrical equipment (e.g., motors, generators, transformers, circuit breakers, etc.). When high voltage insulation (i.e., above 7 kV) capability is required in a.c. electrical equipment, the electrical properties, particularly dielectric constant and dissipation factor, of the cured resins have to conform to certain stringent requirements to be acceptable. This paper describes various \"screening\" tests which are used to evaluate the electrical properties of epoxy-anhydride resins. In particular, dielectric constant and dissipation factor electrical data, obtained in the range 25–150°C and 60 Hz, are presented for epoxy-anhydride resins containing various types of latent accelerators such as quaternary phosphonium and quaternary ammonium compounds, Boron-Lewis Acid complexes, metal acetates and metal acetylacetonates. Details of sample preparation, electrical property measurements and data interpretation are presented. Possible \"pitfalls\" in the technique leading to erroneous results and the possible misinterpretation of the data are mentioned. The reasons for the apparent high dielectric constant and dissipation factor values obtained with some of the latent accelerator additives in the epoxy-anhydride resin are discussed and the possible limitations of some of these materials for high voltage insulation applications are reviewed.","PeriodicalId":113059,"journal":{"name":"1980 IEEE International Conference on Electrical Insulation","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128540362","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

Effects of electric fields on water drops in a viscous oil 电场对粘性油中水滴的影响

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470919

J. L. Douglas, D. Shroff

{"title":"Effects of electric fields on water drops in a viscous oil","authors":"J. L. Douglas, D. Shroff","doi":"10.1109/ICEI.1980.7470919","DOIUrl":"https://doi.org/10.1109/ICEI.1980.7470919","url":null,"abstract":"After the failure of a 66 kV oil-filled junction box in service, caused by ingress of moisture, investigations were made into the behaviour of water drops in a viscous insulating oil. In uniform fields, the water drops elongated until at a critical field strength they became unstable and breakdown followed; these field strengths were significantly lower than those previously reported. Distortion was also observed in non-uniform fields in junction box models, but above the critical field, water was ejected from sharp points which developed at the ends of drops. After the ejection process had continued for a few minutes, mushroom-shaped clouds of tiny droplets formed at the tips. At a later stage, these droplets sometimes lined up to form channels which propagated gradually between the electrodes. However, the presence of such a channel which bridged electrodes did not always result in breakdown of the oil. This was dependent on the droplet sizes and numbers. The general behaviour of water drops in a viscous oil is described in the paper, and the factors which may account for the low breakdown strengths are discussed. A cine film will illustrate the movement of the water droplets in the model junction box.","PeriodicalId":113059,"journal":{"name":"1980 IEEE International Conference on Electrical Insulation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130859032","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

HV laminated-insulated cables subject to bending: Problems and prospects 高压层绝缘电缆易弯曲:问题与展望

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470886

E. Eich

引用次数: 0

Electrode corrosion degradation in metallized polypropylene capacitors 金属化聚丙烯电容器的电极腐蚀退化

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470881

A. Yializis, S. Cichanowski, D. Shaw

{"title":"Electrode corrosion degradation in metallized polypropylene capacitors","authors":"A. Yializis, S. Cichanowski, D. Shaw","doi":"10.1109/ICEI.1980.7470881","DOIUrl":"https://doi.org/10.1109/ICEI.1980.7470881","url":null,"abstract":"One of the major failure mechanisms in metallized polypropylene capacitors is the loss of capacitance through a conversion of the aluminum electrode to an oxide (corrosion). This work examines the voltage endurance and corrosion growth characteristic in metallized polypropylene capacitors under different conditions of temperature, power frequency and applied voltage. The corrosion growth phenomena are studied both in full size 17 uf capacitors and in \"stamp capacitors\" consisting of a two parallel plate arrangement that allows real time observation of the corrosion growth. The effects of electrode thickness and impregnating fluid are investigated and optical and electron microscope observations are presented that quantify different corrosion characteristics. The experimental results indicate that the electrode corrosion process responsible for the loss of capacitance is not consistent with a partial discharge mechanism, but with an electrochemical corrosion involving ionic transport under alternating field conditions. Electron diffraction microscopy data suggests that at least some of the corroded aluminum electrode is converted to an insulating crystalline Al2O3 of V form. The initiation and growth rate of the corrosion sites are shown to have a strong dependance on the frequency of the applied voltage and ambient temperature, with near zero growth under DC conditions, frequencies higher than ten KHz, and temperatures lower than −40°C.","PeriodicalId":113059,"journal":{"name":"1980 IEEE International Conference on Electrical Insulation","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123763126","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: 21

Study of multiple relaxations in methacrylic polymfrs by thermally stimulated current and creep 热刺激电流和蠕变对甲基丙烯酸聚合物多重弛豫的研究

1980 IEEE International Conference on Electrical Insulation Pub Date : 1980-06-01 DOI: 10.1109/ICEI.1980.7470897

L. Lamarre, D. Chatain, C. Lacabanne, H. Schreiber, M. Wertheimer

{"title":"Study of multiple relaxations in methacrylic polymfrs by thermally stimulated current and creep","authors":"L. Lamarre, D. Chatain, C. Lacabanne, H. Schreiber, M. Wertheimer","doi":"10.1109/ICEI.1980.7470897","DOIUrl":"https://doi.org/10.1109/ICEI.1980.7470897","url":null,"abstract":"Poly (methylmethacrylate), PMMA, and a series of three methacrylic copolymers have been studied in the temperature range from −196°C to about 200°C by the thermally stimulated current (TSC) and the thermally stimulated creep (TSCr) techniques. The comparison of the dielectric and mechanical results has helped resolve ambiguities which arise when only a single technique is employed, and has revealed hitherto unreported characteristics of molecular motions in methacrylic polymers. The most important among these pertains to the 3 relaxation (rotation of the ester sidegroups): both TSCr and TSC have revealed the existence of at least four sub-modes, but in the case of TSC spectra the \"structure\" of the ß peak appears only if the sample is polarized in a relatively low-intensity (≤ 20 kV cm−1) electric field. These sub-modes, each of which is characterized by a single relaxation time, T, have been analysed in detail by TSCr. Although they all obey either an Arrhenius — or a Vogel equation, T values for PMMA are much smaller (while the activation energy, E, is larger) than for the copolymers. This has been attributed to interactions between primary and secondary transitions.","PeriodicalId":113059,"journal":{"name":"1980 IEEE International Conference on Electrical Insulation","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132724485","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