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1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena最新文献

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Experimental investigation of the effect of titanium dioxide and barium titanate additives on DC transient currents in low density polyethylene 二氧化钛和钛酸钡添加剂对低密度聚乙烯直流暂态电流影响的实验研究
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26373
M. Khalil, P. Henk, M. Henriksen, H. Johannesson
{"title":"Experimental investigation of the effect of titanium dioxide and barium titanate additives on DC transient currents in low density polyethylene","authors":"M. Khalil, P. Henk, M. Henriksen, H. Johannesson","doi":"10.1109/CEIDP.1988.26373","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26373","url":null,"abstract":"The effect of titanium dioxide as a semiconductive additive and barium titanate as a highly polar additive on the DC transient currents in low-density polyethylene is investigated. Experiments were made using thick specimens under a high electric field (>25*10/sup 6/ V/m) and a constant temperature of 40 degrees C. Results indicate that the incorporation of these additives has an effect on the DC transient currents in low-density polyethylene.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124194860","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
Role of dissolved gases on the high field luminescence pattern of polyethylene 溶解气体对聚乙烯高场发光模式的影响
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26317
T. Lebey, C. Laurent, C. Mayoux
{"title":"Role of dissolved gases on the high field luminescence pattern of polyethylene","authors":"T. Lebey, C. Laurent, C. Mayoux","doi":"10.1109/CEIDP.1988.26317","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26317","url":null,"abstract":"An experimental setup has been developed to study prebreakdown phenomena in dielectric materials under controlled conditions. A highly sensitive photon counting system coupled with a lens system detects the threshold field for light emission as a function of the nature of the gas. The samples are located in a chamber in which the pressure can be varied from 5.10/sup -7/ to 2.10/sup +3/ torr. Some results are presented concerning the influence of the nature of the gas dissolved in polyethylene samples on the electroluminescence threshold field and light pattern. The presence of electronegative gas molecules in the sample strongly affects the observed behavior by changing the volumetric and interfacial conditions. Good agreement is found between the values of the threshold field for light emission reported and those by other workers if the sensitivity of the detection systems is considered.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121269752","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
Better computational estimates of ionic space charge fields 离子空间电荷场的更好的计算估计
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26340
J.‐R. Li, H. Wintle
{"title":"Better computational estimates of ionic space charge fields","authors":"J.‐R. Li, H. Wintle","doi":"10.1109/CEIDP.1988.26340","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26340","url":null,"abstract":"An alternative technique is developed for computing ionic space-charge fields connected with power transmission line losses and corona charging in the wire-to-plane geometry. This approach leads to better estimates of the space-charge distribution near the wire, while retaining the round cross section of the wire and the boundary at infinity. It is shown that even when satisfactory numerical convergence overall is not obtained, the ground plane conditions are reproduced faithfully.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116964560","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
The effect of crystallinity on observed polarization hysteresis loops in polyvinylidene fluoride 结晶度对聚偏氟乙烯中极化磁滞回线的影响
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26370
I. Guy, J. Unsworth
{"title":"The effect of crystallinity on observed polarization hysteresis loops in polyvinylidene fluoride","authors":"I. Guy, J. Unsworth","doi":"10.1109/CEIDP.1988.26370","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26370","url":null,"abstract":"It is demonstrated experimentally that electric fields cause conversion of alpha to beta crystals and a growth of beta crystals in PVDF (polyvinylidene fluoride). The former process leads to an increase in sample polarization as measured by external circuitry. Since beta crystals are polar and alpha crystals are not, this increased polarization is to be expected. The field-induced growth of beta crystals appears to lead to a decrease in sample polarization, but the cause for this is not so readily apparent. A detailed model for polarization reversal in ferroelectric polymers, which includes the contribution of the depolarizing field within the crystals, predicts that the length-to-width ratio of the crystals will have an effect on the observed hysteresis loops. Thus, a possible explanation of the reduction in macroscopic polarization is that the field-induced growth of beta crystals alters the length-to-width ratio of the lamellar crystals, thus reducing the depolarizing field within the crystal.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"230 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117119705","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
High field conduction and space charge formation in polypropylene film 聚丙烯薄膜中的高场传导与空间电荷形成
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26371
M. Nagao, M. Kosaki, Y. Hase
{"title":"High field conduction and space charge formation in polypropylene film","authors":"M. Nagao, M. Kosaki, Y. Hase","doi":"10.1109/CEIDP.1988.26371","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26371","url":null,"abstract":"High-field conduction and space-charge formation in polypropylene (PP) film at high temperatures was studied by measuring charging and discharge currents. The electric-field dependence of the charging current was divided into three regions: the low-, the medium-, and the high-field region. In the high-field region, the increase of the charging current with electric field is depressed from the Schottky line, and anomalous discharging currents which flow in the same direction as the charging currents were observed. The appearance depended on the anode metal rather than the cathode and was most remarkable under the condition of an Au anode and Al cathode. The breakdown tests were also made at 100 degrees C with different combinations of electrode metals. The samples with the Au anode showed a lower breakdown strength than those with the Al anode. These processes may be caused by the hetero-space charge formation near the anode.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127017728","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
A new parameter for the prediction of deterioration in epoxy ground wall insulation 一种预测环氧地墙保温劣化的新参数
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26319
Y. Kim, J. K. Nelson
{"title":"A new parameter for the prediction of deterioration in epoxy ground wall insulation","authors":"Y. Kim, J. K. Nelson","doi":"10.1109/CEIDP.1988.26319","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26319","url":null,"abstract":"A new partial discharge parameter, dynamic stagnation voltage, which is independent of voltage and polarity, is found to be a useful diagnostic measure in predicting remaining life and assessing insulation health. Twelve stator bars were taped with nine half flap layers of resin-rich press-curable mica-tape. Six examples were electrically stressed and three samples were subjected to combined thermal and electrical stresses. It is shown that the original electrical strength of epoxy-mica insulation can be interpreted in terms of this parameter, I/sub t/. For new insulation, I/sub t/=40 kV is assumed to be normal for this geometry and formulation. Insulation with I/sub t/=20 kV has a tree channel which extends to the middle of the ground insulation. Generally, large-area delamination appears, which is verified by tear-down analysis. I/sub t/<15 kV appears to be the critical value for insulation failure, since it is estimated that less than 1/2 of the insulation layer remains undeteriorated.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"275 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121957170","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
Non-uniform field breakdown of gases 气体的非均匀场击穿
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26339
J. Drapeau, G. Olivier, Y. Gervais
{"title":"Non-uniform field breakdown of gases","authors":"J. Drapeau, G. Olivier, Y. Gervais","doi":"10.1109/CEIDP.1988.26339","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26339","url":null,"abstract":"The empirical breakdown law is extended to the evaluation of breakdown voltage under nonuniform field conditions. The effects of pressure and gap length are investigated. It is shown that, in nonuniform field conditions, the exponential relation between breakdown voltage and molecular density (pressure) is not affected. However, the different gases do not have the same behaviour under nonuniform field configuration. In particular, the disruptive voltage of Freons is greatly reduced by the nonuniformity of the field.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"77 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123270980","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
Wavelength and energy dispersive X-ray studies of contaminants in water treed insulation 水树绝缘体中污染物的波长和能量色散x射线研究
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26312
A. Bulinski, S. Bamji, P. Timbrell, J. Densley
{"title":"Wavelength and energy dispersive X-ray studies of contaminants in water treed insulation","authors":"A. Bulinski, S. Bamji, P. Timbrell, J. Densley","doi":"10.1109/CEIDP.1988.26312","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26312","url":null,"abstract":"The authors describe the results of an investigation to locate the contaminants within water trees grown in polymeric insulation using energy- and wavelength-dispersive X-ray (EDX and WDX) spectroscopy. Trees were grown in low-density polyethylene cross-linked polyethylene and dry-cured exposed to solutions of NaCl or CuSO/sub 4/ at stresses up to 8 kV/mm. Some specimens examined semiconducting electrodes and also a semiconducting layer in the middle of the insulation, to form a sandwich-type specimen. It is shown that water trees contain contaminants in sufficient concentration to be detected by EDX and WDX X-ray spectroscopy. In steam-cured cables WDX has shown that the contaminants appear to concentrate in the cavities of the treed regions within these cables. A scanning electron microscopy backscattered electron image was used to reveal the location of water trees and their contaminants distribution. Contaminants appear to be distributed throughout the entire water tree and do not seem to concentrate in any specific region of the tree. It is also shown that particles at the semiconductor/insulation interface result in the rapid growth of water trees in the presence of moisture and electric stress.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128204218","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: 5
Analytical study of the electrical behavior of carbon-black-filled polymeric materials 炭黑填充高分子材料电学行为的分析研究
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26330
H. Kato, T. Futagami, Y. Miyashita
{"title":"Analytical study of the electrical behavior of carbon-black-filled polymeric materials","authors":"H. Kato, T. Futagami, Y. Miyashita","doi":"10.1109/CEIDP.1988.26330","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26330","url":null,"abstract":"Summary form only given. The authors analyzed the behavior of electrical conductive materials containing acetylene black using heat cycles between room temperature and 90 degrees C. It was found that the degree of the change of conductivity is determined by the initial dispersion of carbon black, the crosslinking density, and the thermal expansion coefficient of the polymer matrix. Increasing the crosslinking density of the polymer suppressed the change of conductivity through the heat cycle. This phenomenon can be explained by the migration of carbon black through the polymer matrix becoming too difficult. In the case of a blended polymer matrix, it was revealed that the hard segment of the polymer matrix acted to minimize the change of electrical conductivity. These findings indicated that the small change of conductivity can be explained by the migration and coagulation of carbon black.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134620878","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
Impurities in electrical trees grown in field-aged cables 在野外老化的电缆中生长的电气树中的杂质
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI: 10.1109/CEIDP.1988.26314
J. Crine, S. Haridoss, P. Hinrichsen, A. Houdayer, G. Kajrys
{"title":"Impurities in electrical trees grown in field-aged cables","authors":"J. Crine, S. Haridoss, P. Hinrichsen, A. Houdayer, G. Kajrys","doi":"10.1109/CEIDP.1988.26314","DOIUrl":"https://doi.org/10.1109/CEIDP.1988.26314","url":null,"abstract":"The micro-PIXE (proton-induced X-ray emission) facility of the University of Montreal was used to evaluate the impurity content in and out of electrical trees and the breakdown channels grown in a few field-aged cross-linked polyethylene cables. In a typical case, high amounts of Cl, Mg, Al, and K were detected in the electrical tree growing from a water tree. A wide dispersion of local impurity contents was observed in and out of the tree. In breakdown channels, traces of metallic conductor and concentric neutral as well as Si, Cl, K and Ca were observed in the carbonized walls of the channels. It is concluded that from this preliminary study it is difficult to determine whether some specific impurities may enhance the initiation of electrical tree, although very high amounts of chlorine, potassium, and calcium were detected in the studied trees.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"334 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133665404","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
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