Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414143
Yang Jia-xiang, Li Fujia, Jin Chong-Jun
In this paper, the velocity field of EHV power transformer oil has been calculated in one step and two step section pipe models. As a result of these calculations, the optimal configuration of the oil inlet is determined to be that of a fluted cone.<>
{"title":"A method of reducing streaming electrification at oil inlet by EHV transformers","authors":"Yang Jia-xiang, Li Fujia, Jin Chong-Jun","doi":"10.1109/ICPADM.1994.414143","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414143","url":null,"abstract":"In this paper, the velocity field of EHV power transformer oil has been calculated in one step and two step section pipe models. As a result of these calculations, the optimal configuration of the oil inlet is determined to be that of a fluted cone.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"26 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132644624","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414122
L. Jermendy
Different types of epoxy resin current and voltage transformers were tested in order to determine the insulation degradation caused by partial discharges and their ageing characteristics. The deterioration process was regularly controlled by measuring the amount of partial discharge, the capacity and loss angle. Dangerous degradation of insulation was detected. The dielectric strength of different types and different composition of epoxy resin components was determined. The evaluation of tests was carried out by using mathematical statistical methods.<>
{"title":"Investigation of ageing phenomena on epoxy resin insulation materials","authors":"L. Jermendy","doi":"10.1109/ICPADM.1994.414122","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414122","url":null,"abstract":"Different types of epoxy resin current and voltage transformers were tested in order to determine the insulation degradation caused by partial discharges and their ageing characteristics. The deterioration process was regularly controlled by measuring the amount of partial discharge, the capacity and loss angle. Dangerous degradation of insulation was detected. The dielectric strength of different types and different composition of epoxy resin components was determined. The evaluation of tests was carried out by using mathematical statistical methods.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134633193","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414084
H. Yamashita, M. Okumura, K. Yamazawa, M. Pompili, C. Mazzetti, E. Forster
In this paper, the effect of polarity on prebreakdown phenomena in perfluorinated polyether (PFPE) under nonuniform field was investigated. The inception and propagation of streamers were observed using a high speed and high magnification shadowgraph system. The current pulses were also measured simultaneously using a LED current pulse measurement system. The streamer inception voltage for both polarities were -9.99 kV and +12.86 kV, respectively. The deviation of time delay from the voltage application to the streamer inception was larger for a positive point than a negative. The initial shape of the negative streamer was a filament which emanated from a needle tip. On the other hand, for a positive point, a filamentary streamer started at about 9 /spl mu/m away from a needle tip, and propagated toward a needle tip. These experimental results suggested that the inception of a positive streamer needs a much higher field than a negative one due to the higher ionization potential of the fluorine atom in PFPE as well as breakdown voltage.<>
{"title":"Simultaneous measurements of streamer and partial discharge processes in perfluorinated polyether","authors":"H. Yamashita, M. Okumura, K. Yamazawa, M. Pompili, C. Mazzetti, E. Forster","doi":"10.1109/ICPADM.1994.414084","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414084","url":null,"abstract":"In this paper, the effect of polarity on prebreakdown phenomena in perfluorinated polyether (PFPE) under nonuniform field was investigated. The inception and propagation of streamers were observed using a high speed and high magnification shadowgraph system. The current pulses were also measured simultaneously using a LED current pulse measurement system. The streamer inception voltage for both polarities were -9.99 kV and +12.86 kV, respectively. The deviation of time delay from the voltage application to the streamer inception was larger for a positive point than a negative. The initial shape of the negative streamer was a filament which emanated from a needle tip. On the other hand, for a positive point, a filamentary streamer started at about 9 /spl mu/m away from a needle tip, and propagated toward a needle tip. These experimental results suggested that the inception of a positive streamer needs a much higher field than a negative one due to the higher ionization potential of the fluorine atom in PFPE as well as breakdown voltage.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132217383","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.413965
H. Kato, S. Simoura, M. Kawahigashi
Enhancement of the dielectrical strength of low density polyethylene(LDPE) by means of blending of some new elastic polymers was studied. The di- and tri-block styrene-isoprene copolymers were found to be most effective for improving the impulse breakdown strength of LDPE. The most optimum blending ratio for individual copolymers, for example, di-block copolymer with styrene content of 20 wt% gave the most significant improvement of Imp. BDS of LDPE with 35 to 40 wt% blending ratio. In this copolymer, styrene block offers a hard segment, and the isoprene unit behaves as a soft segment. This structure can be considered to give direct influence on the final morphology of the elastomer/LDPE blends. TEM observation on several blended polymers which gave excellent Imp. BDS revealed that the dispersion and morphological nature of these samples were closely related to the processing temperature. Certain relation of improvement in Imp. BDS of blended LDPE and its morphological nature are discussed.<>
{"title":"Morphology and dielectric strength of some new blended polymeric materials","authors":"H. Kato, S. Simoura, M. Kawahigashi","doi":"10.1109/ICPADM.1994.413965","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413965","url":null,"abstract":"Enhancement of the dielectrical strength of low density polyethylene(LDPE) by means of blending of some new elastic polymers was studied. The di- and tri-block styrene-isoprene copolymers were found to be most effective for improving the impulse breakdown strength of LDPE. The most optimum blending ratio for individual copolymers, for example, di-block copolymer with styrene content of 20 wt% gave the most significant improvement of Imp. BDS of LDPE with 35 to 40 wt% blending ratio. In this copolymer, styrene block offers a hard segment, and the isoprene unit behaves as a soft segment. This structure can be considered to give direct influence on the final morphology of the elastomer/LDPE blends. TEM observation on several blended polymers which gave excellent Imp. BDS revealed that the dispersion and morphological nature of these samples were closely related to the processing temperature. Certain relation of improvement in Imp. BDS of blended LDPE and its morphological nature are discussed.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132618234","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414144
Liu Guang, Y. H. Liang
The physical process of when a circuit breaker cuts out the arc of short-circuit current in a power system is analysed when the neutral point in a power system grounds through a special nonlinear grounding resistor. This method can restrict the speed of short-circuit current which flows through at zero value, thereby raising the intensity of self-restoring insulation and enhancing the ability of cut-out of the short-circuit current in circuit breakers. The calculation results presented agree fairly well with the authors' test figures.<>
{"title":"A new method of raising the intensity of self-restoring insulation in circuit breaker","authors":"Liu Guang, Y. H. Liang","doi":"10.1109/ICPADM.1994.414144","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414144","url":null,"abstract":"The physical process of when a circuit breaker cuts out the arc of short-circuit current in a power system is analysed when the neutral point in a power system grounds through a special nonlinear grounding resistor. This method can restrict the speed of short-circuit current which flows through at zero value, thereby raising the intensity of self-restoring insulation and enhancing the ability of cut-out of the short-circuit current in circuit breakers. The calculation results presented agree fairly well with the authors' test figures.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114126161","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.413947
Hengkun Xie, Xinyan Wu, Zongren Peng, Hui Zhang
The energy required for electrons to break chemical bonds is traditionally referred to as the bonding energy. On the basis of chemical structure theory and the characteristics of electrical breakdown in polymers, the present paper suggests that the bonding energy is inadequate to express the energy required for breaking chemical bonds of polymers in electrical breakdown processes. Based on a comprehensive analysis of the breakdown strength and morphology parameters measured with X-ray photoelectron spectrometry (XPS), small-angle X-ray scattering (SAXS) and X-ray wide angle diffraction (XWAD) techniques, the calculated energy required for breaking chemical bonds causing breakdown of polypropylene is about 8.2 eV, which is approximately equal to the band gap energy (E/sub g/). Both the theoretical analysis and the experimental results in the present study show clearly that the band gap (E/sub g/), instead of the bonding energy, should be considered as the energy criterion for breaking chemical bonds in electrical breakdown processes of polymers.<>
{"title":"The energy criterion for breaking chemical bonds in electrical breakdown process of polymers","authors":"Hengkun Xie, Xinyan Wu, Zongren Peng, Hui Zhang","doi":"10.1109/ICPADM.1994.413947","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413947","url":null,"abstract":"The energy required for electrons to break chemical bonds is traditionally referred to as the bonding energy. On the basis of chemical structure theory and the characteristics of electrical breakdown in polymers, the present paper suggests that the bonding energy is inadequate to express the energy required for breaking chemical bonds of polymers in electrical breakdown processes. Based on a comprehensive analysis of the breakdown strength and morphology parameters measured with X-ray photoelectron spectrometry (XPS), small-angle X-ray scattering (SAXS) and X-ray wide angle diffraction (XWAD) techniques, the calculated energy required for breaking chemical bonds causing breakdown of polypropylene is about 8.2 eV, which is approximately equal to the band gap energy (E/sub g/). Both the theoretical analysis and the experimental results in the present study show clearly that the band gap (E/sub g/), instead of the bonding energy, should be considered as the energy criterion for breaking chemical bonds in electrical breakdown processes of polymers.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114366433","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.413969
S. Watanabe, N. Hayashi, Y. Kinoshita, A. Ohashi, Y. Uchida, D. Dykes, G. Touchard
The concept of functionally gradient materials (FGMs) has emerged recently in Japan. Application fields for such materials are found in mechanical, chemical, biological and electrical engineering. In electrical engineering, they have utilisation potential in feeler sensors, resistors, magnetic shields, lossless optical fibres and superconductors. Hitherto two kinds of techniques have been available for the manufacture of FGMs: chemical and physical vapour deposition methods. Physical vapour deposition methods include sputtering and injection of ions. This paper proposes a new physical manufacturing method developed by the authors: a progressive and gradual introduction of additives. The method itself is explained and the materials produced by it are examined with respect to their resistivity and heat emitting properties.<>
{"title":"A new manufacturing method for functionally gradient materials, and its applications","authors":"S. Watanabe, N. Hayashi, Y. Kinoshita, A. Ohashi, Y. Uchida, D. Dykes, G. Touchard","doi":"10.1109/ICPADM.1994.413969","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413969","url":null,"abstract":"The concept of functionally gradient materials (FGMs) has emerged recently in Japan. Application fields for such materials are found in mechanical, chemical, biological and electrical engineering. In electrical engineering, they have utilisation potential in feeler sensors, resistors, magnetic shields, lossless optical fibres and superconductors. Hitherto two kinds of techniques have been available for the manufacture of FGMs: chemical and physical vapour deposition methods. Physical vapour deposition methods include sputtering and injection of ions. This paper proposes a new physical manufacturing method developed by the authors: a progressive and gradual introduction of additives. The method itself is explained and the materials produced by it are examined with respect to their resistivity and heat emitting properties.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114541949","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.413923
T. C. Mortensen, Y. Bunganaen, G.B. Scelsi, G. A. Woolsey
Corona and glow discharges have been maintained in sulphur hexafluoride (SF/sub 6/) atmospheres over varying periods of time, under various conditions of pressure, voltage and current, and in discharge chambers with walls and electrodes of different materials. As a result of dissociation of SF/sub 6/ and subsequent reactions of the dissociation products, both with gaseous impurities present in the SF/sub 6/ atmosphere and released from walls and electrodes, and with solid surfaces, a wide range of stable gaseous solid by-products is produced. The gaseous by-products have been studied by extracting discharge samples and subjecting them to mass spectrometry and Fourier Transform Infra Red (FTIR) analysis. Stable solid materials deposited onto surfaces have been investigated using X-ray analysis and an optical fibre technique. As expected, the nature and amounts of by-products vary significantly with the type of discharge, duration of discharge, and materials of chamber and electrode assemblies. Because, invariably, oxygen exists as an impurity, one or more of the oxyfluorides (SOF/sub 2/, SOF/sub 4/ and SO/sub 2/F/sub 2/) appears as a gaseous by-product. Other gaseous by-products include SO/sub 2/, CO, probably due to the presence of insulating materials within the discharge chamber, and SiF/sub 4/ when the chamber has a glass window. Stable solid deposits build up over time on surfaces. Preliminary analysis indicates that metal fluorides form on electrodes, while powders containing sulphur deposit preferentially on any insulating surfaces that exist within the discharge chamber. The study reveals the complexity of chemical processes that take place when SF/sub 6/ is dissociated in a discharge, and the subsequent degradation of the integrity of the SF/sub 6/ insulation that must follow. The results of the present study suggest that optical absorption techniques may be the preferred option for on-site monitoring of practical SF/sub 6/ gas-insulated systems.<>
{"title":"Gaseous and solid by-products of SF/sub 6/ discharges","authors":"T. C. Mortensen, Y. Bunganaen, G.B. Scelsi, G. A. Woolsey","doi":"10.1109/ICPADM.1994.413923","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413923","url":null,"abstract":"Corona and glow discharges have been maintained in sulphur hexafluoride (SF/sub 6/) atmospheres over varying periods of time, under various conditions of pressure, voltage and current, and in discharge chambers with walls and electrodes of different materials. As a result of dissociation of SF/sub 6/ and subsequent reactions of the dissociation products, both with gaseous impurities present in the SF/sub 6/ atmosphere and released from walls and electrodes, and with solid surfaces, a wide range of stable gaseous solid by-products is produced. The gaseous by-products have been studied by extracting discharge samples and subjecting them to mass spectrometry and Fourier Transform Infra Red (FTIR) analysis. Stable solid materials deposited onto surfaces have been investigated using X-ray analysis and an optical fibre technique. As expected, the nature and amounts of by-products vary significantly with the type of discharge, duration of discharge, and materials of chamber and electrode assemblies. Because, invariably, oxygen exists as an impurity, one or more of the oxyfluorides (SOF/sub 2/, SOF/sub 4/ and SO/sub 2/F/sub 2/) appears as a gaseous by-product. Other gaseous by-products include SO/sub 2/, CO, probably due to the presence of insulating materials within the discharge chamber, and SiF/sub 4/ when the chamber has a glass window. Stable solid deposits build up over time on surfaces. Preliminary analysis indicates that metal fluorides form on electrodes, while powders containing sulphur deposit preferentially on any insulating surfaces that exist within the discharge chamber. The study reveals the complexity of chemical processes that take place when SF/sub 6/ is dissociated in a discharge, and the subsequent degradation of the integrity of the SF/sub 6/ insulation that must follow. The results of the present study suggest that optical absorption techniques may be the preferred option for on-site monitoring of practical SF/sub 6/ gas-insulated systems.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114842915","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414012
S. Wu, Chi-Ping Wang, L. Zhang
Electrical treeing characteristics of fibreglass reinforced plastic (FRP) have been investigated on a set of specially made samples with a single-core glass fibre. It is pointed out that the direction of a glass fibre at an angle of /spl Theta/ with the electric field and the diameter of a glass fibre have significant effects on the initiation and propagation of tree in the interface of FRP. The morphology of tree and mechanism of treeing in samples were discussed.<>
{"title":"On the treeing characteristics in the interface of FRP","authors":"S. Wu, Chi-Ping Wang, L. Zhang","doi":"10.1109/ICPADM.1994.414012","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414012","url":null,"abstract":"Electrical treeing characteristics of fibreglass reinforced plastic (FRP) have been investigated on a set of specially made samples with a single-core glass fibre. It is pointed out that the direction of a glass fibre at an angle of /spl Theta/ with the electric field and the diameter of a glass fibre have significant effects on the initiation and propagation of tree in the interface of FRP. The morphology of tree and mechanism of treeing in samples were discussed.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"405 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114914292","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}
Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414004
Liangyu Gao, W. Guo, Huifeng Wang, Xiangxiao Qin, T. Mizutani
Special additives were used to modify the semiconducting layer chemically. In this paper, the relationship between the crystal orientation angle of the PE interface and the E/sub b/ has been deduced theoretically. The results of microstructure analysis showed that the modified semiconducting layer affected the crystal orientation angle of the PE interface, and revealed the formation of a very thin diffusion layer during the thermal process, and the suppression of the agglomeration of carbon particles in the semiconducting layer. The results of model cable specimens and treeing tests proved that additives AB/sub 2/ possessed the best modifying effect, in that they enhanced the breakdown strength E/sub b/ (1% Weibull distribution) of PE by 89% and the AC breakdown strength E/sub b/ by 40%, and could increased the treeing inception voltage of PE by 39%.<>
{"title":"Study on improving of interfacial microstructure and breakdown strength of polyethylene for power cables","authors":"Liangyu Gao, W. Guo, Huifeng Wang, Xiangxiao Qin, T. Mizutani","doi":"10.1109/ICPADM.1994.414004","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414004","url":null,"abstract":"Special additives were used to modify the semiconducting layer chemically. In this paper, the relationship between the crystal orientation angle of the PE interface and the E/sub b/ has been deduced theoretically. The results of microstructure analysis showed that the modified semiconducting layer affected the crystal orientation angle of the PE interface, and revealed the formation of a very thin diffusion layer during the thermal process, and the suppression of the agglomeration of carbon particles in the semiconducting layer. The results of model cable specimens and treeing tests proved that additives AB/sub 2/ possessed the best modifying effect, in that they enhanced the breakdown strength E/sub b/ (1% Weibull distribution) of PE by 89% and the AC breakdown strength E/sub b/ by 40%, and could increased the treeing inception voltage of PE by 39%.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115158243","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：