Pub Date : 1991-07-08DOI: 10.1109/ICPADM.1991.172118
W. Xin-sheng, Lu Chong-Hui
The authors summarize the results of joint research into the influence of altitude and atmospheric conditions on the disruptive discharge of external insulation of power transmission apparatus. The same tests on the same configuration and with the same procedures were performed at different altitudes (23 m, 506 m, 1040 m, 1890 m, 2300 m, and 3650 m above sea level). It is shown that the flashover voltages of external insulation of electrical facilities decrease with increase of altitude and decrease of air density. The correction factors of relative air density obtained from test results are nearly equal to the present correction factors in the IEC 60-1 standards and GB311-83 Chinese standards.<>
{"title":"The new research on air density correction factor (power line external insulation)","authors":"W. Xin-sheng, Lu Chong-Hui","doi":"10.1109/ICPADM.1991.172118","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172118","url":null,"abstract":"The authors summarize the results of joint research into the influence of altitude and atmospheric conditions on the disruptive discharge of external insulation of power transmission apparatus. The same tests on the same configuration and with the same procedures were performed at different altitudes (23 m, 506 m, 1040 m, 1890 m, 2300 m, and 3650 m above sea level). It is shown that the flashover voltages of external insulation of electrical facilities decrease with increase of altitude and decrease of air density. The correction factors of relative air density obtained from test results are nearly equal to the present correction factors in the IEC 60-1 standards and GB311-83 Chinese standards.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"33 1","pages":"546-549 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89966033","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172111
K. Izumi, H. Honma, J. Tanaka
In order to clarify the influence of internal partial discharges on metal oxide surge arrester elements (ZnO varistors) caused under polluted conditions, tests simulating internal partial discharges were made. In the simulation tests, internal partial discharges occurred between the ZnO varistor side surface and the needle in both air and nitrogen atmospheres. It was found that the deterioration of the ZnO varistor occurs in an air atmosphere. Some aspects in the deterioration of ZnO varistors were elucidated from measurements of the V-I characteristics, analysis of the gas generated, observations by scanning electron microscope, and thermally stimulated current spectra. It is shown that the deterioration of a ZnO varistor under partial discharge conditions in air may be caused by both the erosion of the side surface of the ZnO varistor and the action of some generated gases. This deterioration may be accelerated under service conditions.<>
{"title":"Deterioration of metal oxide surge arrester element caused by internal partial discharges under polluted conditions","authors":"K. Izumi, H. Honma, J. Tanaka","doi":"10.1109/ICPADM.1991.172111","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172111","url":null,"abstract":"In order to clarify the influence of internal partial discharges on metal oxide surge arrester elements (ZnO varistors) caused under polluted conditions, tests simulating internal partial discharges were made. In the simulation tests, internal partial discharges occurred between the ZnO varistor side surface and the needle in both air and nitrogen atmospheres. It was found that the deterioration of the ZnO varistor occurs in an air atmosphere. Some aspects in the deterioration of ZnO varistors were elucidated from measurements of the V-I characteristics, analysis of the gas generated, observations by scanning electron microscope, and thermally stimulated current spectra. It is shown that the deterioration of a ZnO varistor under partial discharge conditions in air may be caused by both the erosion of the side surface of the ZnO varistor and the action of some generated gases. This deterioration may be accelerated under service conditions.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"38 1","pages":"517-520 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80032375","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172104
T. Hashizume, C. Shinoda, K. Nakamura, M. Hotta, T. Tani, T. Taniguchi
The authors describe the results of an accelerated aging test of 6.6 kV cross-linked polyethylene (XLPE) insulated cables made by a dry-curing process. The accelerated aging test described permits the study of the AC breakdown mechanism. The accelerated test was carried out by applying 6.9 kV, at 1 kHz, at room temperature, with the conductor strands and the insulation shield kept constantly moist. The AC breakdown voltage was investigated for a given aging time. Within three months of aging time, the breakdown voltage decreased to about half of the initial breakdown voltage. This decrease is found to be mainly caused by the moisture permeating the insulation of the cables. To clarify the influence of moisture on the breakdown voltage, some further tests were carried out. The results clearly show that the breakdown voltage is reduced in the presence of even an infinitesimal moisture content. Also, as expected, the presence of micro-water paths in the amorphous region caused the reduction of breakdown voltage.<>
{"title":"A consideration of changes of AC breakdown voltages during an accelerated test of immersed dry-cured XLPE cables","authors":"T. Hashizume, C. Shinoda, K. Nakamura, M. Hotta, T. Tani, T. Taniguchi","doi":"10.1109/ICPADM.1991.172104","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172104","url":null,"abstract":"The authors describe the results of an accelerated aging test of 6.6 kV cross-linked polyethylene (XLPE) insulated cables made by a dry-curing process. The accelerated aging test described permits the study of the AC breakdown mechanism. The accelerated test was carried out by applying 6.9 kV, at 1 kHz, at room temperature, with the conductor strands and the insulation shield kept constantly moist. The AC breakdown voltage was investigated for a given aging time. Within three months of aging time, the breakdown voltage decreased to about half of the initial breakdown voltage. This decrease is found to be mainly caused by the moisture permeating the insulation of the cables. To clarify the influence of moisture on the breakdown voltage, some further tests were carried out. The results clearly show that the breakdown voltage is reduced in the presence of even an infinitesimal moisture content. Also, as expected, the presence of micro-water paths in the amorphous region caused the reduction of breakdown voltage.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"14 1 1","pages":"490-493 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77101614","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172310
P.A. von Guggenberg, J. Melcher
A three-wavelength interdigitated flexible sensor has been developed for measuring the heterogeneous properties of transformer pressboard. The imposed spatial wavelengths are 1 mm, 2.5 mm, and 5 mm, and the temporal frequency ranges from 0.005 Hz to 10000 Hz. Because the penetration depth of the electric field is approximately 1/5 of the wavelength, the sensor can be used to observe spatial as well as temporal changes in the dielectric loss of transformer pressboard. Experimental results indicate that the measured response is sensitive to changes in the moisture content of the pressboard. In addition, the sensor can be used to monitor the absorption of moisture into pressboard as a function of time. This measurement provides an estimate of the diffusion coefficient of moisture in oil-free transformer pressboard at room temperature of 3.5*10/sup -11/ m/sup 2//s.<>
{"title":"A three-wavelength flexible sensor for monitoring the moisture content of transformer pressboard","authors":"P.A. von Guggenberg, J. Melcher","doi":"10.1109/ICPADM.1991.172310","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172310","url":null,"abstract":"A three-wavelength interdigitated flexible sensor has been developed for measuring the heterogeneous properties of transformer pressboard. The imposed spatial wavelengths are 1 mm, 2.5 mm, and 5 mm, and the temporal frequency ranges from 0.005 Hz to 10000 Hz. Because the penetration depth of the electric field is approximately 1/5 of the wavelength, the sensor can be used to observe spatial as well as temporal changes in the dielectric loss of transformer pressboard. Experimental results indicate that the measured response is sensitive to changes in the moisture content of the pressboard. In addition, the sensor can be used to monitor the absorption of moisture into pressboard as a function of time. This measurement provides an estimate of the diffusion coefficient of moisture in oil-free transformer pressboard at room temperature of 3.5*10/sup -11/ m/sup 2//s.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"59 1","pages":"1262-1265 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76497594","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172256
K. Kaneko, A. Umemura, M. Hikita, A. Fujii, Y. Suzuoki, T. Mizutani, M. Ieda
The space charge effects on electrical breakdown were investigated on PPS (poly-p-phenylene sulfide) films with three different thicknesses, 6, 13, and 25 mu m. The difference between impulse and DC breakdown strengths suggested the effect of space charge. The larger space charge effect appeared in the thinner samples. The effect of DC prestress on the breakdown strength was investigated. The positive space-charge accumulation was directly probed by the laser-induced-pressure-pulse technique. The amount of space charge and its penetration depth were estimated to be about 10/sup -7/ C/cm/sup 2/ and 10 mu m from the anode (homo space charge), respectively, under 1-2 MV/cm at 30 degrees C. Both were insensitive to the sample thickness.<>
{"title":"Consideration of space charge effect on electrical breakdown of poly-p-phenylene sulfide films","authors":"K. Kaneko, A. Umemura, M. Hikita, A. Fujii, Y. Suzuoki, T. Mizutani, M. Ieda","doi":"10.1109/ICPADM.1991.172256","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172256","url":null,"abstract":"The space charge effects on electrical breakdown were investigated on PPS (poly-p-phenylene sulfide) films with three different thicknesses, 6, 13, and 25 mu m. The difference between impulse and DC breakdown strengths suggested the effect of space charge. The larger space charge effect appeared in the thinner samples. The effect of DC prestress on the breakdown strength was investigated. The positive space-charge accumulation was directly probed by the laser-induced-pressure-pulse technique. The amount of space charge and its penetration depth were estimated to be about 10/sup -7/ C/cm/sup 2/ and 10 mu m from the anode (homo space charge), respectively, under 1-2 MV/cm at 30 degrees C. Both were insensitive to the sample thickness.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"16 1","pages":"1057-1060 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76918610","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172228
Chen Daqian, Fan Jiang, H. Zhimin, Ge Zhengyan
The authors describe multifunction test equipment for measuring and recording the dielectric spectrum, thermogram, and start-end gel-time of a high polymer specimen from liquid state to cure state. It is shown that the change of the polymer from liquid to solid during a complex cure process can be sensitively and accurately monitored by the dielectric analysis technique. A correlation of three parameters (viscosity, differential thermal analysis, and dielectric dissipation analysis) is established in order to supervise the technological measurement.<>
{"title":"A new testing technique for researching procedure in curing of high polymers","authors":"Chen Daqian, Fan Jiang, H. Zhimin, Ge Zhengyan","doi":"10.1109/ICPADM.1991.172228","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172228","url":null,"abstract":"The authors describe multifunction test equipment for measuring and recording the dielectric spectrum, thermogram, and start-end gel-time of a high polymer specimen from liquid state to cure state. It is shown that the change of the polymer from liquid to solid during a complex cure process can be sensitively and accurately monitored by the dielectric analysis technique. A correlation of three parameters (viscosity, differential thermal analysis, and dielectric dissipation analysis) is established in order to supervise the technological measurement.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"23 1","pages":"946-948 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76425780","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172125
S. Sangkasaad
The authors describe the applications of various kinds of electrical insulation for low and high-voltage equipment in Thailand. Most insulating materials are still imported. The dielectric research activities are concerned with the investigation of local raw materials for producing ceramics and porcelain, for high voltage applications. A porcelain insulator suspension type of insulation for tension higher than 15000 lb was developed. A ferroelectric ceramic, barium titanate, for producing capacitor dielectric can be produced from the local raw material barite. The methods for producing insulation in microelectronic devices are also presented. The applications of SF/sub 6/ gas as a dielectric of standard capacitors and also as internal insulation of high voltage transformers are investigated and the results are found to be satisfactory. The existing testing facilities for dielectric research are also discussed.<>
{"title":"Current status of dielectric research and application in Thailand","authors":"S. Sangkasaad","doi":"10.1109/ICPADM.1991.172125","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172125","url":null,"abstract":"The authors describe the applications of various kinds of electrical insulation for low and high-voltage equipment in Thailand. Most insulating materials are still imported. The dielectric research activities are concerned with the investigation of local raw materials for producing ceramics and porcelain, for high voltage applications. A porcelain insulator suspension type of insulation for tension higher than 15000 lb was developed. A ferroelectric ceramic, barium titanate, for producing capacitor dielectric can be produced from the local raw material barite. The methods for producing insulation in microelectronic devices are also presented. The applications of SF/sub 6/ gas as a dielectric of standard capacitors and also as internal insulation of high voltage transformers are investigated and the results are found to be satisfactory. The existing testing facilities for dielectric research are also discussed.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"67 1","pages":"582-585 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79839140","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172107
Joon-Ung Lee, Kyung-Ook Chang, Choon-Bae Park, S. Grzybowski
To contribute more information on the conduction mechanism in ZnO varistors, a study of ZnO varistors with TiO/sub 2/ additives was conducted. The properties of ZnO varistors are found to depend on the grain structure of ZnO. The mechanism of nonlinear conduction of ZnO may be explained on the basis of the grain structure. The TSC (thermally stimulated current) spectrum was measured to study the trapped carriers in ZnO varistors. Four peaks of TSC may be distinguished on the spectrum of TSC. The origin of the first, second, and third TSC peaks was attributed to the detrapping of the trapped electrons in the shallow trap, donor level, and deep trap, respectively. The origin of the fourth peak was attributed to the process of depolarization of the donor ions in the depleted layer. Adding TiO/sub 2/ to ZnO varistors caused the leakage current to increase.<>
{"title":"The thermally stimulated current in zinc oxide varistors with TiO/sub 2/ additives","authors":"Joon-Ung Lee, Kyung-Ook Chang, Choon-Bae Park, S. Grzybowski","doi":"10.1109/ICPADM.1991.172107","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172107","url":null,"abstract":"To contribute more information on the conduction mechanism in ZnO varistors, a study of ZnO varistors with TiO/sub 2/ additives was conducted. The properties of ZnO varistors are found to depend on the grain structure of ZnO. The mechanism of nonlinear conduction of ZnO may be explained on the basis of the grain structure. The TSC (thermally stimulated current) spectrum was measured to study the trapped carriers in ZnO varistors. Four peaks of TSC may be distinguished on the spectrum of TSC. The origin of the first, second, and third TSC peaks was attributed to the detrapping of the trapped electrons in the shallow trap, donor level, and deep trap, respectively. The origin of the fourth peak was attributed to the process of depolarization of the donor ions in the depleted layer. Adding TiO/sub 2/ to ZnO varistors caused the leakage current to increase.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"124 1","pages":"502-504 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83894864","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172262
S.L. Wang
The relation between dielectric dissipation factor and angular frequency is discussed on the basis of work by R. von Hippel (1954). Particular attention is given to the equivalent static dissipation factor under the steady DC electric field condition.<>
在R. von Hippel(1954)工作的基础上，讨论了介电损耗因子与角频率的关系。特别注意了稳定直流电场条件下的等效静态耗散系数。
{"title":"On the relationship between dielectric dissipation-factor and angular frequency","authors":"S.L. Wang","doi":"10.1109/ICPADM.1991.172262","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172262","url":null,"abstract":"The relation between dielectric dissipation factor and angular frequency is discussed on the basis of work by R. von Hippel (1954). Particular attention is given to the equivalent static dissipation factor under the steady DC electric field condition.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"86 1","pages":"1080-1082 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84846791","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 : 1991-07-08DOI: 10.1109/ICPADM.1991.172211
R. Romanets, V. Bolshakov, B.N. Dikarev
A review of typical works over the last decade on the investigation of the voltage-current characteristics of dielectric liquids is presented. It is shown that the voltage-current characteristics depend on the nature and purity of the liquid, on the range of the electric field, on the electrode material, etc. A comparison of these characteristics with 'universal' characteristics is carried out. A common point of view for the representation of voltage-current characteristics is proposed.<>
{"title":"Voltage-current characteristics of dielectric liquids","authors":"R. Romanets, V. Bolshakov, B.N. Dikarev","doi":"10.1109/ICPADM.1991.172211","DOIUrl":"https://doi.org/10.1109/ICPADM.1991.172211","url":null,"abstract":"A review of typical works over the last decade on the investigation of the voltage-current characteristics of dielectric liquids is presented. It is shown that the voltage-current characteristics depend on the nature and purity of the liquid, on the range of the electric field, on the electrode material, etc. A comparison of these characteristics with 'universal' characteristics is carried out. A common point of view for the representation of voltage-current characteristics is proposed.<<ETX>>","PeriodicalId":6450,"journal":{"name":"[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials","volume":"9 1","pages":"887-889 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82693055","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：