{"title":"Electric behaviour of ZnO varistor studied from TSC measurement","authors":"F. Yoshida, Y. Kamitani, M. Yoshiura, S. Maeta","doi":"10.1109/ICSD.1998.709308","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709308","url":null,"abstract":"In this paper, the results of the ZnO varistor voltage-current characteristics and the thermally stimulated current (TSC) components separated in the temperature range from 50 to 340 K are reported. Additionally, some experimental results before and after applying high-voltage impulse (10 kV) as a false load are reported and discussed. From the experiments on the TSC of ZnO varistor, the following results were obtained: (1) some TSC curves (four or six) of the first-order that correspond to the discrete state individually in the grain boundary can be separated in the temperature range from 50 to 340 K. (2) The dominant TSC peak appeared around room temperature. The trap depth, Et, of this peak depends on the poling field Ep. As Ep increases, Et increased from ca. 0.31 to 0.38 eV. (3) The /spl nu/ value for the dominant TSC peak varied from ca. 10/sup 2/ to 10/sup 3/ 1/s. (4) From this detailed study on the /spl nu/ value of traps, it is understood that the varistor effect depends on the /spl nu/ value of the dominant TSC peak.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"1 1","pages":"393-396"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90300000","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}
{"title":"Experimental investigation of treeing growth in polyethylene insulation","authors":"M.M. Rezinkina, O.L. Rezinkin","doi":"10.1109/ICSD.1998.709288","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709288","url":null,"abstract":"Experimental investigation of PE insulation distortion in power electrical fields was carried out by means of optical registration of treeing growth in electrode system \"needle-plate\". Experiments were performed at following conditions: radius of the needle tip was 2 /spl mu/m; distance between needle and plate -1, 5 mm, applied voltage -6, 7, 8, 9 kV. Carried out experiments have shown some typical features of treeing growth in PE under electrical stress. After initial stage, which is accompanied by increase of fractal dimension, the next stage follows. Stabilization of fractal dimension occurs at this stage. Duration of this stage depends on the level of electrical stress. Period that precedes the breakdown is accompanied by the decrease of fractal dimension of treeing and strong increase of its leading branch length. Another peculiarity of PE treeing growth is increase of its boughs' thickness. If time of the breakdown was less then 20 minutes, branches that are thicker near the needle tip were still thin at their ends. Upon prolong electrical stress treeing boughs have thickened all along. This process may lead to electrical field decrease in the growth area of a treeing and almost complete cessation of treeing penetration inside insulation gap. Treeing with weakly ramified thin boughs are the most dangerous from the point of view of insulation gap breakdown. If treeing has not caused insulator gap breakdown for short time (less then 2-3 minutes), its growth may substantially slow down even upon big stress (U-9 kV). These processes are accompanied by thickening of treeing branches and may be connected with it. Bushing-like ramified treeing with strongly thickening branches are typical for smaller stress (U=6 kV). Such treeing may grow during much longer time without insulation gap breakdown.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"110 1","pages":"313-316"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76997843","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}
{"title":"Numerical simulation of electric currents through insulating materials","authors":"F. Frutos, A. Jimenez, J. A. Perez","doi":"10.1109/ICSD.1998.709261","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709261","url":null,"abstract":"A numerical simulation of electric currents is carried out through solid dielectrics from a model based on the local polarization. A degradation of material was considered to be produced from one of the electrodes and we simulated it by admitting modifications in the chemical structure of the material, which implies an alteration in the value of the corresponding dipole moments that characterize the material, as well as the concentration of the latest. Different simulations are achieved according to the ratio of the degraded thickness and the temperature.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"44 1","pages":"206-209"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85535612","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}
M. Chipara, I. Munteanu, P. Notingher, M. Chipara, J. Reyes Romero, B. Negreanu, D. Panaitescu
{"title":"On polyaniline-polyvinylchloride blends","authors":"M. Chipara, I. Munteanu, P. Notingher, M. Chipara, J. Reyes Romero, B. Negreanu, D. Panaitescu","doi":"10.1109/ICSD.1998.709303","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709303","url":null,"abstract":"In this contribution we extend our previous studies on polyaniline blends to the study of some physical properties of different polyaniline polyvinylchloride (PANI-PVC) blends. Previous data on polyaniline-polyethylene (PANI-PE) blends have revealed a rapid drop of the mechanical features of the blend, as the concentration of polyaniline (PANI) is increased and a relatively slow increase in the electrical conductivity. As the blend has been prepared by mechanical mixing of components, the electrical conductivity decreases in time, probably due to a stabilisation of the blend towards oxygen accompanied by the transformation of the conducting polyaniline (emeraldine salt) into the insulating form of the polyaniline.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"7 1","pages":"372-374"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84964059","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}
{"title":"Observation of space charge distribution up to electric breakdown in acetophenone-coated polyethylene film","authors":"S. Mitsumoto, M. Nagao, M. Kosaki","doi":"10.1109/ICSD.1998.709225","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709225","url":null,"abstract":"This paper describes the effects of polarity of applied voltage and electrode metal on electric conduction and space charge formation up to electric breakdown in one-sidedly acetophenone-coated low-density polyethylene (LDPE) film. Up to the electric field of about 0.5 MV/cm with Au electrode, the acetophenone-coated positive electrode gives much larger conduction current than the negative one, suggesting that the existence of acetophenone at electrode interface enhances the hole injection rather than the electron injection. In the case of Al electrode this polarity dependence is opposite, suggesting the electron injection is more enhanced for Al electrode. Above about 0.5 MV/cm, however, these polarity effects changed oppositely. This change of polarity effect in high field region is explained by considering the space charge distribution and carrier injection from the acetophenone non-coated-side electrode. With the polarity where the current above 0.5 MV/cm became much larger, the dc electric strength showed significant decrease, showing that the dc breakdown is governed by the thermal process caused by Joule heating.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"173 1","pages":"51-54"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82948765","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}
{"title":"The effect of semiconductive screens and XLPE insulation combinations on electrical tree inception","authors":"S. Moody, R. N. Hampton","doi":"10.1109/ICSD.1998.709237","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709237","url":null,"abstract":"Electrical tree inception tests have been carried out on different combinations of semiconductive screen (semicon) needle/XLPE insulation samples. The test programme has been designed so that it is possible to ascertain the main factors which promote or retard electrical tree inception. The results obtained have permitted predictions to be made of the most appropriate material combinations. The analysis shows that the interaction between the insulation and the semicon is highly significant and in fact dominates the performance of the selected material combination. Thus it can be concluded that by careful design and selection of semicon/XLPE combinations, samples with enhanced electrical treeing properties can be manufactured.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"16 1","pages":"106-109"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83003352","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}
{"title":"On the role of the interface with the substrate in the destructive dielectric breakdown of very thin insulating films grown on silicon","authors":"N. Novkovski","doi":"10.1109/ICSD.1998.709338","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709338","url":null,"abstract":"In this paper we treat the connection between the insulator-silicon interface properties and the breakdown. Previously, we showed that there exists striking correlation between the generation of interface traps during the high-field stress and the charge to breakdown in a variety of oxynitride films prepared by RTP. Here we elaborate this question in more detail. This correlation being much stronger that the correlation of the breakdown with the field variations induced with charge trapping, indicates that the degradation leading to the breakdown is most probably insulator-silicon interface degradation itself rather then a direct field induced mechanism or hole trapping at the cathode of injection.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"23 1","pages":"520-523"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90860025","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}
{"title":"Optimum test voltages for breakdown experiments","authors":"C. Heitz","doi":"10.1109/ICSD.1998.709325","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709325","url":null,"abstract":"When performing breakdown measurements on an electrical system, the test voltages have to be chosen carefully in order to yield maximum information about the breakdown characteristic of the system. The better the test voltages are chosen the smaller is the experimental effort for getting a predefined result quality. In this investigation the question \"What are the best test voltages in a breakdown experiment?\" is addressed. A general method is presented that allows to determine the optimum test voltage U/sub N+1/, when N breakdown experiments at voltages U/sub 1/,...U/sub N/ have already been performed. With this method a sequential determination of the optimum test voltages is possible. The usage of optimum test voltages lead to a minimization of the number of breakdown experiments when a predefined result quality has to be reached, or the result quality is maximized for a given number of breakdown experiments.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"1 1","pages":"464-469"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84516963","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}
F. Komori, A. Kojima, M. Hikita, Y. Suzuoki, T. Mizutani
{"title":"Phase-resolved study on partial discharge for degradation diagnosis in polymeric insulating materials using model electrode system","authors":"F. Komori, A. Kojima, M. Hikita, Y. Suzuoki, T. Mizutani","doi":"10.1109/ICSD.1998.709248","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709248","url":null,"abstract":"Using MGI (metal-gap-insulator) and IGI (insulator-gap-insulator) electrode systems with 0.1 mm- or 4.0 mm-thick LDPE samples, we studied the temporal change of PD characteristics. The PD pattern and statistical parameter (PD inception phase) changed with aging time. The IGI electrode system showed a similar change in PD pattern with degradation to that of the MGI electrode system. The PDs in MGI electrodes with the 4.0 mm-thick sample showed new PD characteristics which were absent in the 0.1 mm-thick sample. This was attributed to pit formation just before breakdown. There results suggest the possibility of insulation diagnosis from the beginning to the last stage of PD degradation.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"34 1","pages":"153-156"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81433451","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}
{"title":"Assessment of oil impregnated paper insulated transformers using recovery voltage measurements","authors":"A. Krivda, G. Russell","doi":"10.1109/ICSD.1998.709228","DOIUrl":"https://doi.org/10.1109/ICSD.1998.709228","url":null,"abstract":"The main objective of this study was to assess the advantages of Direct Current Recovery Voltage Measurements over more conventional techniques for condition monitoring of oil impregnated paper insulated power and instrument transformers. This paper focuses attention on the advantages and precautions that must be observed when applying this technique in a realistic environment. The significance of capacitively graded high voltage insulation and the influence of environmental factors such as humidity and wind on the repeatability of recovery voltage measurements are also discussed.","PeriodicalId":13148,"journal":{"name":"ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)","volume":"21 1","pages":"64-68"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86468314","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}