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Some exact solutions for electrothermal breakdown 电热击穿的精确解
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69586
J. J. O'Dwyer
{"title":"Some exact solutions for electrothermal breakdown","authors":"J. J. O'Dwyer","doi":"10.1109/CEIDP.1989.69586","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69586","url":null,"abstract":"Exact solutions for electrothermal breakdown have been given by H.J. Wintle (1981) for the case of a DC voltage between plane parallel thermally conducting electrodes. Wintle's solutions require specific functional dependence on temperature for both electrical and thermal conductivities, and he gives three pairs of suitable functions. In the present work, one of Wintle's models is chosen to extend the exact solutions to coaxial cylinders and concentric spheres. The boundary conditions used are either a thermally insulating inner electrode and a thermally conducting outer electrode, or both electrodes thermally conducting. For a thermally insulating center electrode, and an electrode radius ratio of 5, the field distorts to an almost constant value for a voltage that is 90% of critical; for a voltage that is 99% of critical, the field at the outer electrode is 10 times the value of the field at the inner electrode.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"45 1","pages":"442-446"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81061850","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
Dielectric breakdown strength of GFRPs under mechanical stresses in cryogenic liquids 低温液体中机械应力作用下gfrp的介电击穿强度
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69591
K. Fukushi, M. Nagai, Y. Kamata
{"title":"Dielectric breakdown strength of GFRPs under mechanical stresses in cryogenic liquids","authors":"K. Fukushi, M. Nagai, Y. Kamata","doi":"10.1109/CEIDP.1989.69591","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69591","url":null,"abstract":"The dielectric strength of GFRPs (glass-fiber-reinforced plastics) under combined application of electrical and mechanical stresses was investigated in liquid He, liquid N/sub 2/, and silicone oil at room temperature. With the combined application of tensile and electrical stresses in cryogenic liquids, the dielectric breakdown of GFRPs occurred prior to mechanical breakdown when the applied electrical stress was lower than the DBS (dielectric breakdown strength) of GFRPs without tensile stress. In the case of tensile stress application under constantly applied electrical stress, the DBS and GFRPs decreased markedly. The reason for the large DBS decrease of GFRPs was the occurrence of microcracks in matrix resins because of their brittleness at cryogenic temperatures. Combining GFRP with polyimide film in cryogenic liquids lessened the decrease in DBS. Compared with tensile stress application, the influence of compressive stress on the DBS of GFRPs was very small.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"58 1","pages":"471-476"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86967381","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
Secondary electron emission from a thin coating on Lucite and Lexan substrates 在透明树脂和Lexan衬底上薄涂层的二次电子发射
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69582
L. Hatfield, E. R. Boerwinkle
{"title":"Secondary electron emission from a thin coating on Lucite and Lexan substrates","authors":"L. Hatfield, E. R. Boerwinkle","doi":"10.1109/CEIDP.1989.69582","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69582","url":null,"abstract":"Measurements of the SEEC (secondary electron emission coefficient) on samples of Lucite and Lexan cut from commercially available bar stock exhibit large variations from sample to sample. This scatter is too large to be explained by experimental uncertainties. It is proposed that the sample surfaces really are different due to the inhomogeneous bar stock. Techniques exist for measuring the density and composition of the polymers and it is suggested that these should be applied to the surface of these samples. The problem is not trivial, however, because the SEEC measurements probe only a thin surface layer. Therefore, the surface density, composition, and structure must be analyzed using techniques which also probe only a thin layer, such as X-ray photoelectron spectroscopy.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"100 1","pages":"414-421"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90307941","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
Corona-discharge electrodes for improved electrostatic separation of electroinsulating materials 改进电绝缘材料静电分离的电晕放电电极
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69537
L. Dascalescu, A. Iuga, R. Morar, A. Ifrim
{"title":"Corona-discharge electrodes for improved electrostatic separation of electroinsulating materials","authors":"L. Dascalescu, A. Iuga, R. Morar, A. Ifrim","doi":"10.1109/CEIDP.1989.69537","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69537","url":null,"abstract":"Two sets of corona-discharge electrodes, wire and needle type, have been tested on laboratory electroseparators. As compared to needle-type electrodes, the wire-type ones are characterized by: (i) a larger possibility of adjusting the parameters which determine the field in the active zone of the separator; (ii) a less complicated manufacturing technology; and (iii) smaller quantities of ozone generated during corona discharge. Needle-type electrodes, on the other hand, have at least three favorable characteristics: (i) not being affected by vibrations; (ii) lower corona voltages; and (iii) higher slopes of V-A digrams (which means an increased corona effect). Based on these facts, the authors have used this kind of electrode with the ELSIM-2 insulation-metal electroseparator. Pilot-plant tests of electroseparation were effected on chopped PVC-insulated copper wire scrap and on a mica-feldspar-quartz mixture, using various field configurations, to validate the efficacy of the design. High-purity electroinsulating materials were obtained and then incorporated into different types of electrical insulation.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"1 1","pages":"143-148"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86688283","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
Polarization phenomena in cross-linked polyethylene (XLPE) containing water-trees 含水树交联聚乙烯(XLPE)中的极化现象
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69550
D. Das-Gupta, J. Densley
{"title":"Polarization phenomena in cross-linked polyethylene (XLPE) containing water-trees","authors":"D. Das-Gupta, J. Densley","doi":"10.1109/CEIDP.1989.69550","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69550","url":null,"abstract":"The authors report preliminary results of a polarization study using thermally stimulated discharge current (TSDC) measurements and the thermal current transient technique on XLPE (cross-linked polyethylene) samples in which water trees have been grown. A schematic representation of the observed current transients at the onset or removal of a step input of thermal radiation is shown. Values of the peak thermal transient current I/sub p/ of control samples and aged samples after poling at 6.14*10/sup 6/ Vm/sup -1/ and after the TSDC runs are given. It may be observed that the I/sub p/ value increases by two orders of magnitude after aging of 472.2 h followed by a DC poling at a field of 6.14*10/sup 6/ Vm/sup -1/. In addition, the TSDC spectra for (unaged) control samples and samples in which water trees have been grown are shown. It is observed that the dominant TSDC peak at 80 degrees C increases significantly for samples with increasing aging time.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"4612 1 1","pages":"224-229"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86887326","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
Morphology and dielectric properties of uniaxially and biaxially-oriented polycarbonate capacitor films 单轴和双轴取向聚碳酸酯电容器薄膜的形态和介电性能
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69575
S. Yen, L. Lowry, C. Bankston, V. Capozzi
{"title":"Morphology and dielectric properties of uniaxially and biaxially-oriented polycarbonate capacitor films","authors":"S. Yen, L. Lowry, C. Bankston, V. Capozzi","doi":"10.1109/CEIDP.1989.69575","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69575","url":null,"abstract":"A reflective X-ray diffraction method developed to determine the absolute X/sub c/ (crystallinity) of UX and BX (uniaxially and biaxially oriented) PC (polycarbonate) film is described. Conditions for achieving optimum properties for producing BX high-X/sub c/ and isotropic PC film were found. For BX PC film of identical thickness to UX PC film the electric breakdown strength was found to be proportional to X/sub c/. The thermal and mechanical properties as well as the direct-current electric breakdown strengths of the newly developed isotropic high-X/sub c/ BX PC film are compared with those of the anisotropic commercial PC capacitor film. Capacitors made from the high-X/sub c/ isotropic BX PC film when subjected to a 1000-hour 100 degrees C, 42-V DC life test showed no change in dissipation factor and no change in capacitance, and they met 100 degrees C insulation resistance test requirements. In general, it is concluded that this novel BX PC film is much superior to the traditional UX commercial capacitor PC film.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"14 1","pages":"375-383"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77744237","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
Calibration of volume charge measurements by use of electron beam implantation 用电子束注入校正体积电荷测量
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69585
C. Cooke, K. Wright, N. Takasu, J. Bernstein, E. Gollin
{"title":"Calibration of volume charge measurements by use of electron beam implantation","authors":"C. Cooke, K. Wright, N. Takasu, J. Bernstein, E. Gollin","doi":"10.1109/CEIDP.1989.69585","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69585","url":null,"abstract":"The authors consider the use of charges implanted by means of energetic electron beams to create known charge distributions for calibration purposes. For a successful calibration the reference charge samples should provide a well-defined charge, including location, distribution, and magnitude (and sign). Although these parts of the calibration may be accomplished with different samples, it is preferable for simplicity and accuracy to include these in a single sample. The e-beam implanted charge distributions have been found to achieve the needed reference charge characteristics. Specifically, it was demonstrated that e-beam implantation of charges in charge-retaining plastics, such as PMMA (polymethyl methacrylate), provides a useful reference for the purpose of calibrating charge measurement instruments.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"28 1","pages":"435-441"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76233179","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
Direct observation of space charge distribution in polyethylene 聚乙烯空间电荷分布的直接观察
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69564
T. Mizutani, Y. Suzuoki, T. Furuta, M. Ieda, T. Suzuki
{"title":"Direct observation of space charge distribution in polyethylene","authors":"T. Mizutani, Y. Suzuoki, T. Furuta, M. Ieda, T. Suzuki","doi":"10.1109/CEIDP.1989.69564","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69564","url":null,"abstract":"The space charge behavior in PE (polyethylene) was investigated using the laser-induced pressure pulse (LIPP) technique and the piezoelectrically induced pressure step (PIPS) wave technique. Specimens used were 25- mu m-thick films and 0.6- and 1-mm-thick plates of low-density PE nominally free from additives. The LIPP measurement was carried out on a spectrum which was polarized at 333 K for 15 min and subsequently short-circuited at room temperature. The PIPS measurement was carried out on a 25- mu m-thick specimen under an applied field. Positive space charge was found to exist in the PE bulk, and negative space charge due to electron injection was dominant at high fields. Oxidation of PE was found to enhance electron and hole injection.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"45 1","pages":"309-314"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85866841","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: 12
Measurement of charge distributions in coaxial structures-application to high voltage cables 同轴结构中电荷分布的测量。高压电缆的应用
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69562
S. Mahdavi, C. Alquié, J. Lewiner
{"title":"Measurement of charge distributions in coaxial structures-application to high voltage cables","authors":"S. Mahdavi, C. Alquié, J. Lewiner","doi":"10.1109/CEIDP.1989.69562","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69562","url":null,"abstract":"The authors present direct measurements of charge distributions in coaxial cables conducted during the application of a high voltage, using the pressure wave propagation (PWP) method. It is shown that, as could be expected, the main effects take place near the inner electrode, where the applied electric field is the largest. Near this electrode, charges are transferred which lead to the creation of homocharges and to a decrease of the interfacial electric field. Heterocharges build up with time and compensate the effect of the homocharges on this electric field. A stabilized state is reached at 50 degrees C after approximately 120 hours. Heterocharges of two types have been observed, some localized very close to the inner electrode, the others extending over a quarter of the insulator. The origin of the first type can be attributed to the diffusion in the insulator of impurities present in the inner semiconducting electrode impurities dissociated by the local electric field. These results demonstrate that the PWP method can be applied to the study of high-voltage cables.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"222 1","pages":"296-302"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86393915","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: 9
The influence of impurities on electrohydrodynamic motion in insulating oils 杂质对绝缘油中电流体动力运动的影响
Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69569
J. Sheshakamal, J. Cross
{"title":"The influence of impurities on electrohydrodynamic motion in insulating oils","authors":"J. Sheshakamal, J. Cross","doi":"10.1109/CEIDP.1989.69569","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69569","url":null,"abstract":"The authors present results of an investigation of the influence of inherent and added impurities in transformer oils on electrohydrodynamic (EHD) instabilities. All the test samples were subjected to a voltage step applied to parallel plane electrodes. Two of the test liquids were sampled from in-service transformers. The magnitude of change in the current in transformer oils after filtration (0.45 mu m) was three to five times larger than the change caused by the addition of conducting particles. The transformer oil aged in service for longer duration showed higher EHD current and flow which were associated with higher particulate concentration and conductivity. The measurement of AC breakdown strength was less reflective of the extent of oil degradation as compared to transient current response. The space charge density variation that causes EHD instability in insulating oils depends on both suspended and dissolved impurities.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"35 1","pages":"338-345"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79164973","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
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