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Conference on Electrical Insulation and Dielectric Phenomena,最新文献

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Effect of dissolved water on electrical conduction in liquid dielectrics 溶解水对液体介质导电性的影响
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69571
A. Ebe, N. Iijima, M. Sone, H. Mitsui
{"title":"Effect of dissolved water on electrical conduction in liquid dielectrics","authors":"A. Ebe, N. Iijima, M. Sone, H. Mitsui","doi":"10.1109/CEIDP.1989.69571","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69571","url":null,"abstract":"The state of water in liquid dielectric was analyzed by Fourier transform infrared spectroscopy during a conduction test. The liquid dielectric used was di-octyl-phthalate (DOP) with different proportions of water. The free water in DOP is shown to contribute to the conduction. The states of the free water or weakly bound water are shown to change under stress.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"44 1","pages":"352-357"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90880433","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
DC discharge phenomena in artificial air for an undersea habitat 海底生境人工空气中的直流放电现象
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69535
K. Kokari, N. Sugawara, Y. Kaneko, H. Tagashira
{"title":"DC discharge phenomena in artificial air for an undersea habitat","authors":"K. Kokari, N. Sugawara, Y. Kaneko, H. Tagashira","doi":"10.1109/CEIDP.1989.69535","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69535","url":null,"abstract":"The electrical discharge characteristics of mixtures of helium and oxygen having a constant oxygen partial pressure were investigated to evaluate the safety of electric systems used in an undersea habitat. A comparison is made with the discharge characteristics of air. The spark breakdown voltage of the mixtures of helium and oxygen is at least 1.3 times higher than that of dry air throughout the pressure range studied (from 0.4 to 4.91 MPa). The minimum corona onset voltage was lower at pressures up to about 1.3 MPa than that of dry air. It was confirmed that at pressure higher than 1.3 MPa, it is possible to use even the usual electrical equipment in the mixture of helium and oxygen prevalent in an undersea habitat. It is noted that the spark breakdown voltage for the mixture of helium and oxygen has a plateau in the pressure range from 0.8 to 2 MPa.","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"1 1","pages":"131-136"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89102987","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
Ramped voltage testing of transformer oil 变压器油斜坡电压试验
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69573
D.H. Ren, A. Watson
{"title":"Ramped voltage testing of transformer oil","authors":"D.H. Ren, A. Watson","doi":"10.1109/CEIDP.1989.69573","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69573","url":null,"abstract":"It has been shown that, compared with dimethyl siloxane, transformer oil has similar reproducible current characteristics as a function of ramped voltage applied up to a high prebreakdown electric stress, where it obeys the equation I varies as V/sup s/. Moreover, at a very high electric stress, the displacement current component apparently reverses, which was not previously observed in silicone oil. This abnormal phenomenon is very dependent upon the conditions. From an earlier study in silicone oil, the average current response to the rising and falling voltage appears on a log-log scale with two linear portions which are sharply divided. Transformer oil has similar characteristics under similar testing conditions, but with increasing voltage amplitude of the applied ramp the slopes of the linear portions are changed. These two lines may become one if the maximum voltage and ramp rate are very high. This is true for copper and aluminum electrodes at differing gap separations.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"54 1","pages":"363-368"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74178775","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
Effect of nuclear radiation on microstrip and dielectric antennas in space 空间核辐射对微带和介电天线的影响
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69545
A. Kumar
{"title":"Effect of nuclear radiation on microstrip and dielectric antennas in space","authors":"A. Kumar","doi":"10.1109/CEIDP.1989.69545","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69545","url":null,"abstract":"The effect of nuclear radiation in space on dielectric material used in microstrip and dielectric antennas is described. It has been shown that the primary effect of nuclear radiation on materials based on PTFE (polytetrafluoroethylene) is the reduction of molecular weight by breaking the large polymer molecule into smaller parts. There is an increase in brittleness, and this reaction is maximized in the presence of air. The degree to which PTFE is affected is essentially a function of the amount of energy absorbed regardless of the nature of the radiation. The susceptibility of electronic dielectric materials as a function of the total nuclear radiation dose is shown. Usually, the dose rate of 10 rad/h is quoted for the Van Allen belt. At this rate PTFE could operate for more than five years before a threshold level of damage would be detectable electrically and mechanically. Space-proven dielectric antennas are briefly discussed, with particular emphasis on the GTE GSTAR satellite reflector antenna which is fed by a dielectric loaded horn array. The elongation loss caused by radiation on a number of polyimide materials is shown.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"19 1","pages":"192-197"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75802782","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
Evaluation of high temperature capacitor dielectrics 高温电容电介质的评价
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69589
A. Hammoud, I. Myers
{"title":"Evaluation of high temperature capacitor dielectrics","authors":"A. Hammoud, I. Myers","doi":"10.1109/CEIDP.1989.69589","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69589","url":null,"abstract":"Four candidate materials were evaluated for use as high-temperature capacitor dielectrics. The materials investigated were polybenzimidazole polymer and three aramid papers. The samples were characterized with and without heat treatment in terms of their dielectric constant and loss. These properties of the heat-treated samples were also evaluated in a temperature range of 20 to 250 degrees C in the presence of electrical stress of 60 Hz, 50 V/mil. The AC and DC breakdown strengths of both dry and impregnated samples were determined at ambient conditions. The preliminary data indicate that heat treatment of the materials tested improves their dielectric properties and breakdown voltages. The AC and DC dielectric strengths are further improved upon impregnation with a suitable liquid.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"47 1","pages":"459-464"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90580146","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: 13
Oxidation dependence of breakdown strength of XLPE 交联聚乙烯击穿强度的氧化依赖性
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69553
G. Gagnon, S. Pélissou, M. Wertheimer
{"title":"Oxidation dependence of breakdown strength of XLPE","authors":"G. Gagnon, S. Pélissou, M. Wertheimer","doi":"10.1109/CEIDP.1989.69553","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69553","url":null,"abstract":"It has been shown in a previous study (P. Rohl, 1982) that the breakdown strength of polyethylene increases with increasing oxidation levels. The purpose of the research reported here is to verify this somewhat surprising result. Unlike the earlier work, cross-linked polyethylene (XLPE), the principal insulation used in extruded cables, is utilized. The authors correlate dielectric breakdown measurements with oxidation, monitored by Fourier transform infrared (FTIR) spectroscopy, and the results are interpreted using the modified free-volume theory. It is found that the breakdown strength E/sub b/ indeed shows a slight tendency to increase with the oxidation level. In particular, the authors found a correlation between E/sub b/ and the degree of oxidation, expressed in terms of the carbonyl band (1741 cm/sup -1/) absorption. The exact reasons for this behavior are not clear at this time, but appear to be compatible with the modified free-volume theory breakdown.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"118 1","pages":"241-246"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77584904","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
Ferrite-impregnated fibre-glass composites as microwave absorbers 铁氧体浸渍玻璃纤维复合材料作为微波吸收剂
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69580
A. Kumar
{"title":"Ferrite-impregnated fibre-glass composites as microwave absorbers","authors":"A. Kumar","doi":"10.1109/CEIDP.1989.69580","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69580","url":null,"abstract":"The absorption of microwaves in a composite containing a random distribution of iron-oxide particles embedded in fiberglass composites is considered. Generally, iron-oxide particles in the form of spheres or cylinders are held together by a binder such as fiberglass. Since weight and structural integrity of the composite are also of concern in many applications, it is desirable to choose the optimum volume fraction of iron-oxide particles and adjust the shape, size, and distribution of particles to obtain the required mass density and microwave absorbing properties. A short review of mixture theories is given. Results are shown for spherical conducting particles in a pure dielectric host medium and are compared with experimental data. Results (real and imaginary parts of the permittivity and permeability, loss tangent, reflection coefficient, and attenuation per unit length) on iron-oxide impregnated fiberglass composites in the frequency range of 1 to 12 GHz are reported.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"1 1","pages":"403-408"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82307250","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
Influence of wet ageing on the electrical breakdown strength of XLPE cable slices 湿老化对交联聚乙烯电缆片电击穿强度的影响
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69551
C. Chauvet, C. Laurent, C. Mayoux
{"title":"Influence of wet ageing on the electrical breakdown strength of XLPE cable slices","authors":"C. Chauvet, C. Laurent, C. Mayoux","doi":"10.1109/CEIDP.1989.69551","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69551","url":null,"abstract":"In order to investigate the consequences of water-induced degradation on the dielectric breakdown field of polyethylene, the authors performed statistical electric breakdown strength measurements on cable slices previously aged in the presence of water. A Weibull analysis is performed on at least 40 sets of breakdown voltage data for each population, leading to a precise determination of the nominal breakdown field E/sub 0/. Comparison is made as a function of ageing time and testing conditions. Wet ageing under conditions of water tree development affects the breakdown strength of XLPE (cross-linked polyethylene) cable slices. The presence of water trees in the insulation must therefore be considered as potentially harmful.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"100 1","pages":"230-234"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85697073","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
Dielectric strength of crosslinked polyethylene: the effects of the volatile products of the crosslinking reaction 交联聚乙烯的介电强度:交联反应挥发产物的影响
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69590
Y. Shao, K. Sheu, D. Damon, S. Huang, J.F. Johnson
{"title":"Dielectric strength of crosslinked polyethylene: the effects of the volatile products of the crosslinking reaction","authors":"Y. Shao, K. Sheu, D. Damon, S. Huang, J.F. Johnson","doi":"10.1109/CEIDP.1989.69590","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69590","url":null,"abstract":"The breakdown field strength of recessed samples of XLPE (cross-linked polyethylene) containing varying amounts of acetophenone and cumene is shown to decrease with increasing sample thickness. This thickness dependence is more complicated than previously observed. The addition of small amounts of acetophenone to XLPE produces a small increase in the dielectric strength. Small concentrations of cumene have no effect. Results from both AC ramp to failure and impulse breakdown can be fit to Weibull distributions. The characteristic values obtained from ramp to failure measurements depend on the ramp rate as suggested by theory.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"3 1","pages":"465-470"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87629031","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
Comments on the definition of AC capacitance in ASTM-D150-81 对ASTM-D150-81交流电容定义的评析
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69579
S.L. Wang
{"title":"Comments on the definition of AC capacitance in ASTM-D150-81","authors":"S.L. Wang","doi":"10.1109/CEIDP.1989.69579","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69579","url":null,"abstract":"The definition of capacitance in ASTM D150-81 is improved by considering the definition of complex capacitance. It is concluded that since the practical capacitor always has losses, it can be suitably represented by complex capacitance. The complex capacitance is closely related to relative complex permittivity, so that the concept of complex capacitance is very important in technology, and an accurate definition of complex capacitance is necessary for electrical engineering.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"20 1","pages":"398-402"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75277156","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
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