Pub Date : 1995-09-17DOI: 10.1109/ISEIM.1995.496593
C. Banmongkol, T. Mori, T. Mizutani, M. Ishioka, I. Ishino
The authors have investigated the high-field phenomena in low-density polyethylene (LDPE). The objective of this paper is to study the relationship between molecular structure and the high-field phenomena at high temperature near the melting point of LDPE. The results can be summarized as follows. (1) The high-field current and the breakdown strength strongly depend upon film density determined by the concentration of methyl group. (2) The breakdown strength can be qualitatively estimated from the measurement of the high-field current. This incident as well as the above result suggests that a thermal process takes part in the dielectric breakdown of LDPE film at 90/spl deg/C. (3) Both the type and the concentration of carbonyl groups affect the high-field current of LDPE.
{"title":"Influence of molecular structure on high-field phenomena in LDPE films","authors":"C. Banmongkol, T. Mori, T. Mizutani, M. Ishioka, I. Ishino","doi":"10.1109/ISEIM.1995.496593","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496593","url":null,"abstract":"The authors have investigated the high-field phenomena in low-density polyethylene (LDPE). The objective of this paper is to study the relationship between molecular structure and the high-field phenomena at high temperature near the melting point of LDPE. The results can be summarized as follows. (1) The high-field current and the breakdown strength strongly depend upon film density determined by the concentration of methyl group. (2) The breakdown strength can be qualitatively estimated from the measurement of the high-field current. This incident as well as the above result suggests that a thermal process takes part in the dielectric breakdown of LDPE film at 90/spl deg/C. (3) Both the type and the concentration of carbonyl groups affect the high-field current of LDPE.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125313110","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496598
K. Murata, Y. Tanaka, T. Takada
To avoid the effect of space charge accumulation, we must find the condition of low frequency AC voltage application which is low enough to apply the withstand voltage test, and high enough to neglect the effect of space charge accumulation in XLPE. In this report, space charge is measured using the pulsed electro-acoustic (PEA) method with low frequency AC voltage application.
{"title":"Space charge formation in XLPE with low frequency AC voltage","authors":"K. Murata, Y. Tanaka, T. Takada","doi":"10.1109/ISEIM.1995.496598","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496598","url":null,"abstract":"To avoid the effect of space charge accumulation, we must find the condition of low frequency AC voltage application which is low enough to apply the withstand voltage test, and high enough to neglect the effect of space charge accumulation in XLPE. In this report, space charge is measured using the pulsed electro-acoustic (PEA) method with low frequency AC voltage application.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125438479","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496547
Hui Ma, Jixun Ma, Guangning Wu, Z. Huang, Xinyan Wu, Henkun Xie, D. Sun, Rumin Zhang
On-line monitoring of partial discharges (PD) in turbine generator is a important test for assessing the condition of generator insulation system. In this study, a broadband current transducer system for on-line monitoring of PD in turbine generator has been studied. Combined with a pulse height analyzer and a frequency spectrum analyzer, the transducer system has been used to detect three types of simulated origins of PD which often exist in turbine generator stator winding (discharges in cavity, discharges at endwindings and discharges due to broken strand). The above three types of PD origins can be recognized by using the acquired time domain spectrum and frequency domain spectrum. Some on-line monitoring results of PD in turbine generator with the transducer system are presented.
{"title":"The study of broadband current transducer system for on-line monitoring of partial discharges in turbine generator","authors":"Hui Ma, Jixun Ma, Guangning Wu, Z. Huang, Xinyan Wu, Henkun Xie, D. Sun, Rumin Zhang","doi":"10.1109/ISEIM.1995.496547","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496547","url":null,"abstract":"On-line monitoring of partial discharges (PD) in turbine generator is a important test for assessing the condition of generator insulation system. In this study, a broadband current transducer system for on-line monitoring of PD in turbine generator has been studied. Combined with a pulse height analyzer and a frequency spectrum analyzer, the transducer system has been used to detect three types of simulated origins of PD which often exist in turbine generator stator winding (discharges in cavity, discharges at endwindings and discharges due to broken strand). The above three types of PD origins can be recognized by using the acquired time domain spectrum and frequency domain spectrum. Some on-line monitoring results of PD in turbine generator with the transducer system are presented.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132221640","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496596
H. Shimada, H. Kiriishi, T. Tashita, Tatsuo Takada, T. Maeno
We have designed an electric field distribution measurement system using electric field modulation and a video camera, and have used the system to measure DC electric field distribution in nitrobenzene. We obtain a lower measurement level of E/sub dc/=200 V/cm. The resolution of the measurement system is about 12 bits, and for higher sensitivity measurement we need to use a higher resolution D/A converter.
{"title":"Measurement of two-dimensional electric field distribution in liquid dielectric using Kerr effect","authors":"H. Shimada, H. Kiriishi, T. Tashita, Tatsuo Takada, T. Maeno","doi":"10.1109/ISEIM.1995.496596","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496596","url":null,"abstract":"We have designed an electric field distribution measurement system using electric field modulation and a video camera, and have used the system to measure DC electric field distribution in nitrobenzene. We obtain a lower measurement level of E/sub dc/=200 V/cm. The resolution of the measurement system is about 12 bits, and for higher sensitivity measurement we need to use a higher resolution D/A converter.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132453700","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496600
T. Tanaka, H. Shirai, O. Kisanuki, M. Uchiumi
The LIPP method was used for measuring the charge distribution at the interface between PE/EVA laminate dielectrics under dc stress. High power laser light of 300 mJ/pulse was applied to a specially coated surface of the specimen. A short (300 ps) and a long (5 ns) laser pulse were used for thin and thick specimens, respectively. The result of the measurement shows that space charge was accumulated at the interface, When it was positive, the space charge stayed at the interface on the EVA side and was not transferred to the interface on the LDPE side. On the contrary, when it was negative, the space charge was transferred to the interface on the LDPE side.
{"title":"Laser-induced pressure pulse measurements of space charge in PE/EVA laminates","authors":"T. Tanaka, H. Shirai, O. Kisanuki, M. Uchiumi","doi":"10.1109/ISEIM.1995.496600","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496600","url":null,"abstract":"The LIPP method was used for measuring the charge distribution at the interface between PE/EVA laminate dielectrics under dc stress. High power laser light of 300 mJ/pulse was applied to a specially coated surface of the specimen. A short (300 ps) and a long (5 ns) laser pulse were used for thin and thick specimens, respectively. The result of the measurement shows that space charge was accumulated at the interface, When it was positive, the space charge stayed at the interface on the EVA side and was not transferred to the interface on the LDPE side. On the contrary, when it was negative, the space charge was transferred to the interface on the LDPE side.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124252578","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496550
W. xinsheng, N. Yoshimura, K. Murata, Y. Tanaka, T. Muronaka, T. Takada
Using plate and coaxial cable samples, the space charge distributions in various polyolefin materials such as PP, HDPE, LDPE and XLPE under DC voltage are investigated by the pulsed electro-acoustic method, and the mechanism of formation of space charge in polyolefin materials under electrical stress is discussed. From the test results, it is shown that the difference in characteristics of space charge distribution in various dielectrics is attributed to the physical and chemical inherence of the materials.
{"title":"The influence of morphology and structure on space charge distribution in polyolefin materials","authors":"W. xinsheng, N. Yoshimura, K. Murata, Y. Tanaka, T. Muronaka, T. Takada","doi":"10.1109/ISEIM.1995.496550","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496550","url":null,"abstract":"Using plate and coaxial cable samples, the space charge distributions in various polyolefin materials such as PP, HDPE, LDPE and XLPE under DC voltage are investigated by the pulsed electro-acoustic method, and the mechanism of formation of space charge in polyolefin materials under electrical stress is discussed. From the test results, it is shown that the difference in characteristics of space charge distribution in various dielectrics is attributed to the physical and chemical inherence of the materials.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"25 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124471439","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496529
T. Czaszejko
A preliminary study of the influence of the short exposure to DC voltage on the growth of water trees in XLPE cable insulation was performed. The DC voltage of 4U/sub 0/ (where U/sub 0/ is the rms rated voltage) was applied for the duration of 15 minutes prior to AC aging, in one set of samples, and in the middle of AC aging, in another set of identical samples. The results have shown an increase of the average length of water trees grown in samples subjected to DC voltage compared with those not exposed to DC voltage. The result was similar for accelerated aging with the liquid needle electrode method and for plain samples aged under rated voltage.
{"title":"Some aspects of water tree growth in XLPE insulation exposed to DC voltage","authors":"T. Czaszejko","doi":"10.1109/ISEIM.1995.496529","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496529","url":null,"abstract":"A preliminary study of the influence of the short exposure to DC voltage on the growth of water trees in XLPE cable insulation was performed. The DC voltage of 4U/sub 0/ (where U/sub 0/ is the rms rated voltage) was applied for the duration of 15 minutes prior to AC aging, in one set of samples, and in the middle of AC aging, in another set of identical samples. The results have shown an increase of the average length of water trees grown in samples subjected to DC voltage compared with those not exposed to DC voltage. The result was similar for accelerated aging with the liquid needle electrode method and for plain samples aged under rated voltage.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114445133","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496521
P. Chavarría, W.F. Araujo
Impulse and DC breakdown tracks of 4 and 30 cm point-plane air gaps were investigated. For smaller gap in both voltage types, the positive-voltage breakdown tracks were found to wander further away from the axis than for negative voltage. For 30 cm point-plane gap the results are inverted, the trajectories of the electrical discharges for negative polarities, as a general rule, may travel more outward from the axis than for positive polarities. This shows that the electrical breakdown trajectories depends on the various discharge modes, so that simple models like that proposed by Watson are unsuited for explaining breakdown tracks.
{"title":"Impulse and DC breakdown tracks of air in point-plane gaps","authors":"P. Chavarría, W.F. Araujo","doi":"10.1109/ISEIM.1995.496521","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496521","url":null,"abstract":"Impulse and DC breakdown tracks of 4 and 30 cm point-plane air gaps were investigated. For smaller gap in both voltage types, the positive-voltage breakdown tracks were found to wander further away from the axis than for negative voltage. For 30 cm point-plane gap the results are inverted, the trajectories of the electrical discharges for negative polarities, as a general rule, may travel more outward from the axis than for positive polarities. This shows that the electrical breakdown trajectories depends on the various discharge modes, so that simple models like that proposed by Watson are unsuited for explaining breakdown tracks.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114213321","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496511
Yong-Woo Lee, Duck-Joo Lee, D. Cho, Nungpyo Hong, W. Kim, Jin-woong Hong
To estimate the dielectric characteristics of an insulating oil for power cables, alkylbenzene oil, an original specimen and specimens aged for 100 and 200 hours at 100/spl deg/C were measured by dielectric characteristics experiments under the conditions of a temperature range from 30[/spl deg/C] to 120[/spl deg/C], a frequency range from 30[Hz] to 1/spl times/10/sup 6/[Hz] and an applied voltage of 2.83 to 19.79[Vpp]. The results of the experiments for the contribution of carrier dynamics to the dielectric characteristics are presented.
{"title":"The dielectric characteristics of insulating alkylbenzene oils for ultra high voltage cables due to aging times","authors":"Yong-Woo Lee, Duck-Joo Lee, D. Cho, Nungpyo Hong, W. Kim, Jin-woong Hong","doi":"10.1109/ISEIM.1995.496511","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496511","url":null,"abstract":"To estimate the dielectric characteristics of an insulating oil for power cables, alkylbenzene oil, an original specimen and specimens aged for 100 and 200 hours at 100/spl deg/C were measured by dielectric characteristics experiments under the conditions of a temperature range from 30[/spl deg/C] to 120[/spl deg/C], a frequency range from 30[Hz] to 1/spl times/10/sup 6/[Hz] and an applied voltage of 2.83 to 19.79[Vpp]. The results of the experiments for the contribution of carrier dynamics to the dielectric characteristics are presented.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124852045","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 : 1995-09-17DOI: 10.1109/ISEIM.1995.496558
I. Kitani, S. Nishimoto, K. Arii
The authors showed that the polarity of the surface potential was always the same as that of the applied voltage. The potential tended to increase to a constant value of about 650 V with increasing the applied voltage and application time for both polarities and both specimens. However, the increase in the short-circuiting time tended to increase the potential on only the low density polyethylene (LDPE) for both polarities, while it did not change that on PP at all. The effect of longer short-circuiting on the increase in the surface potential on the LDPE films for both polarities could be explained by the return of injected charges to the source electrode during the short circuiting period.
{"title":"Surface potential on LDPE film due to residual charges","authors":"I. Kitani, S. Nishimoto, K. Arii","doi":"10.1109/ISEIM.1995.496558","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496558","url":null,"abstract":"The authors showed that the polarity of the surface potential was always the same as that of the applied voltage. The potential tended to increase to a constant value of about 650 V with increasing the applied voltage and application time for both polarities and both specimens. However, the increase in the short-circuiting time tended to increase the potential on only the low density polyethylene (LDPE) for both polarities, while it did not change that on PP at all. The effect of longer short-circuiting on the increase in the surface potential on the LDPE films for both polarities could be explained by the return of injected charges to the source electrode during the short circuiting period.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117128295","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：