With the increasing operating voltages of power systems, the reliability of insulating systems which depends on the defects within the insulation becomes more and more important. It is necessary to develop an accurate, simple and reliable method for defect detection. In this paper, an acoustic signal analysis method for detection of defects in insulation systems based on wavelet transforms is introduced. Some applications of wavelet transforms in detection of defects in insulating systems are given.
{"title":"Detection of defects in insulating systems with wavelet technique","authors":"Xinyan Wu, Guangning Wu, Hui Ma, Hengkun Xie, Songzhen Wu","doi":"10.1109/ISEIM.1995.496610","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496610","url":null,"abstract":"With the increasing operating voltages of power systems, the reliability of insulating systems which depends on the defects within the insulation becomes more and more important. It is necessary to develop an accurate, simple and reliable method for defect detection. In this paper, an acoustic signal analysis method for detection of defects in insulation systems based on wavelet transforms is introduced. Some applications of wavelet transforms in detection of defects in insulating systems are given.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"7 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":"130884538","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.1995.496567
Takahiko Maeda, K. Haga, T. Maeda
We measure the creepage breakdown characteristics of printed wiring boards in silicone gel and obtain an experimental equation. This equation allows us to consider separately the different factors (creepage distance, intrinsic capacity, relative permittivity, insulation layer thickness and electrode location) affecting breakdown voltage. Further, we are able to predict accurately the breakdown limit of insulation in two planes.
{"title":"Creepage breakdown characteristics of printed wiring board in silicone gel","authors":"Takahiko Maeda, K. Haga, T. Maeda","doi":"10.1109/ISEIM.1995.496567","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496567","url":null,"abstract":"We measure the creepage breakdown characteristics of printed wiring boards in silicone gel and obtain an experimental equation. This equation allows us to consider separately the different factors (creepage distance, intrinsic capacity, relative permittivity, insulation layer thickness and electrode location) affecting breakdown voltage. Further, we are able to predict accurately the breakdown limit of insulation in two planes.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"1 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":"129303017","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.1995.496502
C. Shinoda, M. Hotta, K. Nakamura, T. Hashizume, T. Tani
This paper describes the results of the residual AC breakdown voltage investigated using different initial voltage steps for dry-cured power XLPE cables. Also we investigated the cause of the breakdown and the starting points of the electrical-trees which occurred. Based on the relationship between the residual AC breakdown voltages and the starting points of electrical-trees, we will discuss the influence of the initial voltage step on the residual AC breakdown voltage.
{"title":"Influence of initial voltage step on residual AC breakdown voltage of XLPE power cables after accelerated water immersion aging test","authors":"C. Shinoda, M. Hotta, K. Nakamura, T. Hashizume, T. Tani","doi":"10.1109/ISEIM.1995.496502","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496502","url":null,"abstract":"This paper describes the results of the residual AC breakdown voltage investigated using different initial voltage steps for dry-cured power XLPE cables. Also we investigated the cause of the breakdown and the starting points of the electrical-trees which occurred. Based on the relationship between the residual AC breakdown voltages and the starting points of electrical-trees, we will discuss the influence of the initial voltage step on the residual AC breakdown voltage.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"2006 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":"125706462","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.1995.496524
S. Nakamura, K. Inoue, K. Saito, T. Ohkawa, G. Sawa, K. Kitagawa
The resistivity and dielectric constant and their dependence on frequency and temperature were measured in order to clarify the change of aggregations with carbon loading. It has been suggested that there are conducting paths related to networks and branches related to dielectric constant above the percolation threshold where resistivity shows a PTC. It has been concluded that the behavior of branches for temperature is independent of that of conducting paths and branches are formed with weak aggregations. In high carbon loading, isolated carbon aggregations change into conducting paths and branches with heating and that contributes to a part of the negative temperature coefficient of resistance and the increment of /spl epsiv/r'.
{"title":"Resistive and dielectric properties of carbon black (MA600)-polyethylene composites","authors":"S. Nakamura, K. Inoue, K. Saito, T. Ohkawa, G. Sawa, K. Kitagawa","doi":"10.1109/ISEIM.1995.496524","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496524","url":null,"abstract":"The resistivity and dielectric constant and their dependence on frequency and temperature were measured in order to clarify the change of aggregations with carbon loading. It has been suggested that there are conducting paths related to networks and branches related to dielectric constant above the percolation threshold where resistivity shows a PTC. It has been concluded that the behavior of branches for temperature is independent of that of conducting paths and branches are formed with weak aggregations. In high carbon loading, isolated carbon aggregations change into conducting paths and branches with heating and that contributes to a part of the negative temperature coefficient of resistance and the increment of /spl epsiv/r'.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"2014 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":"127554334","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.1995.496587
EunJoo Kim, G. Kato, T. Takeda, Y. Ohki
It is shown that when the thermoplastic polymer polyethersulfone (PES) is irradiated by /spl gamma/-rays, the DC conduction current and thermally stimulated current (TSC) decrease. This is probably because the progress of crosslinking induced by the irradiation hinders the transport of ions.
{"title":"Effect of /spl gamma/-ray irradiation on thermally stimulated current in polyethersulfone","authors":"EunJoo Kim, G. Kato, T. Takeda, Y. Ohki","doi":"10.1109/ISEIM.1995.496587","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496587","url":null,"abstract":"It is shown that when the thermoplastic polymer polyethersulfone (PES) is irradiated by /spl gamma/-rays, the DC conduction current and thermally stimulated current (TSC) decrease. This is probably because the progress of crosslinking induced by the irradiation hinders the transport of ions.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"24 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":"127045281","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.1995.496613
K. Aska Juste, Y. Suzuki, K. Satoh, H. Itoh, Y. Nakao, Y. Sakai, H. Tagashira
High speed Schlieren photography was used to investigate the process in which an impulse breakdown might propagate across the surface of artificial rainwater. Contrary to its well known conductivity dependence, the streamer discharge in acid rain revealed no significant changes in this experimental condition when the pH value of the electrolyte was altered.
{"title":"Studies on the propagation of the creepage discharge across the surface of artificial acid rainwater","authors":"K. Aska Juste, Y. Suzuki, K. Satoh, H. Itoh, Y. Nakao, Y. Sakai, H. Tagashira","doi":"10.1109/ISEIM.1995.496613","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496613","url":null,"abstract":"High speed Schlieren photography was used to investigate the process in which an impulse breakdown might propagate across the surface of artificial rainwater. Contrary to its well known conductivity dependence, the streamer discharge in acid rain revealed no significant changes in this experimental condition when the pH value of the electrolyte was altered.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"94 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":"131304564","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.1995.496503
Z. Hong, T. Demin, Z. Hongwei, Wang Xuan
Using the fact that under irradiation by a laser beam, black contaminants, microvoids and translucent impurities in XLPE insulation display different characteristics of light extinction and scattering, the relationships of detected pulse polarity with kinds of defects and the pulse width and amplitude with the size of the defects are found. Therefore, the detected signal can be applied for measuring and recognizing defects with the aid of a computer. The instrument for defect detection in bulk XLPE insulation is presented in this paper. It is shown in test results that the resolution of detection is 40 /spl mu/m in HV XLPE samples with volume 33.6 cm/sup 3/ at temperature 109/spl deg/C.
{"title":"Laser inspection of defects in HV XLPE cable insulation","authors":"Z. Hong, T. Demin, Z. Hongwei, Wang Xuan","doi":"10.1109/ISEIM.1995.496503","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496503","url":null,"abstract":"Using the fact that under irradiation by a laser beam, black contaminants, microvoids and translucent impurities in XLPE insulation display different characteristics of light extinction and scattering, the relationships of detected pulse polarity with kinds of defects and the pulse width and amplitude with the size of the defects are found. Therefore, the detected signal can be applied for measuring and recognizing defects with the aid of a computer. The instrument for defect detection in bulk XLPE insulation is presented in this paper. It is shown in test results that the resolution of detection is 40 /spl mu/m in HV XLPE samples with volume 33.6 cm/sup 3/ at temperature 109/spl deg/C.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"104 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":"122883898","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.1995.496543
A. Yamazaki, Y. Tutumi, T. Yonezawa
Time series data of typical tree type discharges are analyzed from the viewpoint of whether a discharge pulse phase affects the next discharge pulse phase. Contrary to an expectation from the Whitehead model, there seem to be no mutual relationship between a pulse phase and the next pulse phase. On the other hand, the average phase of a discharge pulse group in a half cycle has a slight tendency to affect that in the next half cycle. The time series information of practical tree discharges are analyzed by using test data of a 66-kV cross-linked polyethylene cable with an artificial defect.
{"title":"Relation between pulse generating phase and that of the adjacent pulse at tree discharge","authors":"A. Yamazaki, Y. Tutumi, T. Yonezawa","doi":"10.1109/ISEIM.1995.496543","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496543","url":null,"abstract":"Time series data of typical tree type discharges are analyzed from the viewpoint of whether a discharge pulse phase affects the next discharge pulse phase. Contrary to an expectation from the Whitehead model, there seem to be no mutual relationship between a pulse phase and the next pulse phase. On the other hand, the average phase of a discharge pulse group in a half cycle has a slight tendency to affect that in the next half cycle. The time series information of practical tree discharges are analyzed by using test data of a 66-kV cross-linked polyethylene cable with an artificial defect.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"43 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":"121296921","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.1995.496506
S. Kobayashi, T. Arai, K. Kudo
In this paper, we simulated 3D tree patterns with the field controlled random nature and used the parameters Vapp (applied voltage), Vd (potential drop in a tree channel), Ec (critical field for tree propagation) and /spl eta/ (the relation between local field and growing probability). As a result, the various shapes of tree patterns are obtained and the model holds more physical realizations.
{"title":"Fractal analysis of 3D simulated tree patterns considering critical field and potential drop","authors":"S. Kobayashi, T. Arai, K. Kudo","doi":"10.1109/ISEIM.1995.496506","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496506","url":null,"abstract":"In this paper, we simulated 3D tree patterns with the field controlled random nature and used the parameters Vapp (applied voltage), Vd (potential drop in a tree channel), Ec (critical field for tree propagation) and /spl eta/ (the relation between local field and growing probability). As a result, the various shapes of tree patterns are obtained and the model holds more physical realizations.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"27 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":"128713463","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.1995.496603
R. Shimomura, S. Kobayashi, K. Kudo
This paper describes the chaotic behavior of luminous characteristics in time series during AC electrical tree propagation in EVA and PMMA specimens. The authors consider the fractal dimension of the attractor, maximum Lyapunov exponents and self correlation functions, based on light intensity measurements.
{"title":"Chaotic character of luminous phenomena during electrical tree propagation in polymeric insulating materials","authors":"R. Shimomura, S. Kobayashi, K. Kudo","doi":"10.1109/ISEIM.1995.496603","DOIUrl":"https://doi.org/10.1109/ISEIM.1995.496603","url":null,"abstract":"This paper describes the chaotic behavior of luminous characteristics in time series during AC electrical tree propagation in EVA and PMMA specimens. The authors consider the fractal dimension of the attractor, maximum Lyapunov exponents and self correlation functions, based on light intensity measurements.","PeriodicalId":130178,"journal":{"name":"Proceedings of 1995 International Symposium on Electrical Insulating Materials","volume":"1 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":"129066527","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}
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