Pub Date : 2006-12-01DOI: 10.1109/CEIDP.2006.312100
R. Hebner, H. El-kishky, M. Abdel-Salam, F. Brown
This paper presents the results of numerical simulation and analysis of the characteristics of stress-grading systems of high voltage rotating machines against frequency. The stress-grading systems are optimally designed to minimize the local electric field enhancement at a discrete number of frequencies. The performance characteristics of each system are then generated and studied within a given frequency range. The potential distribution characteristics as well as the local electric stress, surface resistance, and the power dissipation characteristics are generated and studied against frequency.
{"title":"Higher frequency performance of stress-grading systems for HV large rotating machines","authors":"R. Hebner, H. El-kishky, M. Abdel-Salam, F. Brown","doi":"10.1109/CEIDP.2006.312100","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312100","url":null,"abstract":"This paper presents the results of numerical simulation and analysis of the characteristics of stress-grading systems of high voltage rotating machines against frequency. The stress-grading systems are optimally designed to minimize the local electric field enhancement at a discrete number of frequencies. The performance characteristics of each system are then generated and studied within a given frequency range. The potential distribution characteristics as well as the local electric stress, surface resistance, and the power dissipation characteristics are generated and studied against frequency.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121870907","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 : 2006-12-01DOI: 10.1109/CEIDP.2006.312007
S. Ohtsuka, T. Teshima, S. Matsumoto, M. Hikita
This paper deals with an estimation manner of charge quantity of partial discharge (PD) in GIS by PD-induced electromagnetic (EM) wave measured with UHF method. Charge quantity of PD is important to understand PD activity or condition for insulation diagnosis, and the charge estimation by UHF method could contribute to a simplification and high sensitivity of corona free test for electric power apparatus. In this study, we theoretically investigated the relationship between PD current waveform and PD-induced EM wave propagating in a model GIS, using FD-TD method. As a result, we can find that the value of double integral of PD-induced EM wave's TEM mode component is basically proportional to the charge quantity of PD current pulse independently of the sensor distance from PD source and the PD current pulse's shape.
{"title":"Relationship between PD-induced electromagnetic wave measured with UHF method and charge quantity obtained by PD current waveform in model GIS","authors":"S. Ohtsuka, T. Teshima, S. Matsumoto, M. Hikita","doi":"10.1109/CEIDP.2006.312007","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312007","url":null,"abstract":"This paper deals with an estimation manner of charge quantity of partial discharge (PD) in GIS by PD-induced electromagnetic (EM) wave measured with UHF method. Charge quantity of PD is important to understand PD activity or condition for insulation diagnosis, and the charge estimation by UHF method could contribute to a simplification and high sensitivity of corona free test for electric power apparatus. In this study, we theoretically investigated the relationship between PD current waveform and PD-induced EM wave propagating in a model GIS, using FD-TD method. As a result, we can find that the value of double integral of PD-induced EM wave's TEM mode component is basically proportional to the charge quantity of PD current pulse independently of the sensor distance from PD source and the PD current pulse's shape.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122304087","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 : 2006-12-01DOI: 10.1109/CEIDP.2006.312020
Y. Ohki, N. Hirai
In order to respond to soaring public concern about environmental protection, various biodegradable polymers have been developed. The present paper reports the electrical conduction and breakdown properties of various biodegradable polymers such as poly-L-lactic acid (PLLA), polyethylene terephthalate succinate (PETS), polycaprolactone butylene succinate (PCL-BS), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyhydroxybutyrate/valerate (PHB/V) in comparison to those of low-density polyethylene (LDPE).
{"title":"Dielectric Properties of Biodegradable Polymers","authors":"Y. Ohki, N. Hirai","doi":"10.1109/CEIDP.2006.312020","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312020","url":null,"abstract":"In order to respond to soaring public concern about environmental protection, various biodegradable polymers have been developed. The present paper reports the electrical conduction and breakdown properties of various biodegradable polymers such as poly-L-lactic acid (PLLA), polyethylene terephthalate succinate (PETS), polycaprolactone butylene succinate (PCL-BS), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyhydroxybutyrate/valerate (PHB/V) in comparison to those of low-density polyethylene (LDPE).","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129454315","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311962
J. K. Park, Claire Gu, B. Lee
This study on comparative analysis of the surface degradation mechanism through measurement of chemical and electrical changes was conducted to explain the surface degradation of FRP (fiber reinforced polymer) resulting from a plasma interaction and degradation process. Chemical and electrical analysis of a macromolecular surface subjected to plasma treatment shows that a hydrophilic surface is caused by the generation of radicals containing the -COO group, on the surface of which the static balance is destroyed rapidly to become positive.
{"title":"Surface static properties of plasma treated FRP","authors":"J. K. Park, Claire Gu, B. Lee","doi":"10.1109/CEIDP.2006.311962","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311962","url":null,"abstract":"This study on comparative analysis of the surface degradation mechanism through measurement of chemical and electrical changes was conducted to explain the surface degradation of FRP (fiber reinforced polymer) resulting from a plasma interaction and degradation process. Chemical and electrical analysis of a macromolecular surface subjected to plasma treatment shows that a hydrophilic surface is caused by the generation of radicals containing the -COO group, on the surface of which the static balance is destroyed rapidly to become positive.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125871631","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311957
A.P. Mishra, R. Gorur, S. Venkataraman, D. Kingsbury
Transmission and distribution networks of most utilities worldwide have a substantial quantity of porcelain and toughened glass insulators that have been in service for over 30 years; a number that has been traditionally considered as useful life for planning purposes. Many utilities are implementing programs to replace older or defective insulators for improving reliability and also for upgrading their lines. In order to help prioritize line maintenance it is important to identify the condition of insulators and replace those insulators whose performance has reduced significantly from their new condition, hence threatening reliability. In this project, porcelain and toughened glass insulators that were in service for periods ranging from 10-30 years were removed from several locations. Electrical (puncture strength, flashover voltage) and mechanical (tensile strength) tests were performed to assess any reduction in performance. Diagnostic tests such as analysis of bonding agents, identification of internal failure paths were performed to understand failure causes. A sufficiently large number of samples were evaluated and this permitted condition assessment with statistically significant confidence limits
{"title":"Condition assessment of porcelain and toughened glass insulators from residual strength tests","authors":"A.P. Mishra, R. Gorur, S. Venkataraman, D. Kingsbury","doi":"10.1109/CEIDP.2006.311957","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311957","url":null,"abstract":"Transmission and distribution networks of most utilities worldwide have a substantial quantity of porcelain and toughened glass insulators that have been in service for over 30 years; a number that has been traditionally considered as useful life for planning purposes. Many utilities are implementing programs to replace older or defective insulators for improving reliability and also for upgrading their lines. In order to help prioritize line maintenance it is important to identify the condition of insulators and replace those insulators whose performance has reduced significantly from their new condition, hence threatening reliability. In this project, porcelain and toughened glass insulators that were in service for periods ranging from 10-30 years were removed from several locations. Electrical (puncture strength, flashover voltage) and mechanical (tensile strength) tests were performed to assess any reduction in performance. Diagnostic tests such as analysis of bonding agents, identification of internal failure paths were performed to understand failure causes. A sufficiently large number of samples were evaluated and this permitted condition assessment with statistically significant confidence limits","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123776046","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311963
Y. Sabri, M. Farzaneh, J. Zhang
The arc behavior and its propagation mechanism on pre-contaminated insulator surfaces covered with ice were investigated and are presented in this paper. Using a simplified cylindrical physical model, the arc characteristics were determined. Intervening factors and parameters such as arc length and ice thickness were studied. These results will serve to extend the mathematical model previously developed at CIGELE for the prediction of the flashover voltage of pre-contaminated insulators covered with ice.
{"title":"Arc characteristics of polluted insulators covered with ice","authors":"Y. Sabri, M. Farzaneh, J. Zhang","doi":"10.1109/CEIDP.2006.311963","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311963","url":null,"abstract":"The arc behavior and its propagation mechanism on pre-contaminated insulator surfaces covered with ice were investigated and are presented in this paper. Using a simplified cylindrical physical model, the arc characteristics were determined. Intervening factors and parameters such as arc length and ice thickness were studied. These results will serve to extend the mathematical model previously developed at CIGELE for the prediction of the flashover voltage of pre-contaminated insulators covered with ice.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114911340","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311984
H. Nakamura, Y. Yamamoto, Y. Mizuno
This paper proposes a new method for fault diagnosis of induction motors based on Hidden Markov Model, which is widely used in the field of speech recognition. In order to carry out pattern recognition, current waveforms running in stator winding are analyzed for motors with short circuit fault in stator windings or with broken rotor bars. Frequency spectrum of current are also investigated. The usefulness of the proposed diagnosis method is verified through pattern recognitions for arbitrary current waveforms obtained by experiments.
{"title":"Diagnosis of electrical and mechanical faults of induction motor","authors":"H. Nakamura, Y. Yamamoto, Y. Mizuno","doi":"10.1109/CEIDP.2006.311984","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311984","url":null,"abstract":"This paper proposes a new method for fault diagnosis of induction motors based on Hidden Markov Model, which is widely used in the field of speech recognition. In order to carry out pattern recognition, current waveforms running in stator winding are analyzed for motors with short circuit fault in stator windings or with broken rotor bars. Frequency spectrum of current are also investigated. The usefulness of the proposed diagnosis method is verified through pattern recognitions for arbitrary current waveforms obtained by experiments.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122107677","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312014
C. Petrarca, G. Lupò
On-site partial discharge (PD) measurements are affected by external noise and disturbances of various nature such as interferences from radio transmissions, stochastic noise, steep front pulses from power electronics, etc. In such a hostile electromagnetic environment, the partial discharge can be completely submerged by the surrounding signals and the sensitivity and reliability of the measurement can be strongly affected. Once the signal has been recorded, a post-processing tool is needed in order to recover the PD pulses. In this paper a wavelet based technique has been used in order to extract the PD data from a noisy environment: the Wavelet Packet Transform (WPT) has been adopted, which allows a more detailed analysis of the signal with respect to the Discrete Time Wavelet Transform (DTWT). As a first step, the post-processing tool has been applied to a typical uncorrupted PD pulse which has been decomposed up to its deepest level; subsequently, an energy-based criterion in conjunction with hard-thresholding has been used in order to select a suitable mother wavelet and an adequate decomposition level; useful patterns have then been collected for the reconstruction of the signal with minimum shape distortion. Finally, the suggestions provided have been used for the extraction of numerical simulating signals, characterised by a very low signal to noise ratio (SNR), reproducing a PD pulse corrupted by external interferences and noise, in order to show the effectiveness of the proposed method.
{"title":"Wavelet Packet Denoising of Partial Discharge Data","authors":"C. Petrarca, G. Lupò","doi":"10.1109/CEIDP.2006.312014","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312014","url":null,"abstract":"On-site partial discharge (PD) measurements are affected by external noise and disturbances of various nature such as interferences from radio transmissions, stochastic noise, steep front pulses from power electronics, etc. In such a hostile electromagnetic environment, the partial discharge can be completely submerged by the surrounding signals and the sensitivity and reliability of the measurement can be strongly affected. Once the signal has been recorded, a post-processing tool is needed in order to recover the PD pulses. In this paper a wavelet based technique has been used in order to extract the PD data from a noisy environment: the Wavelet Packet Transform (WPT) has been adopted, which allows a more detailed analysis of the signal with respect to the Discrete Time Wavelet Transform (DTWT). As a first step, the post-processing tool has been applied to a typical uncorrupted PD pulse which has been decomposed up to its deepest level; subsequently, an energy-based criterion in conjunction with hard-thresholding has been used in order to select a suitable mother wavelet and an adequate decomposition level; useful patterns have then been collected for the reconstruction of the signal with minimum shape distortion. Finally, the suggestions provided have been used for the extraction of numerical simulating signals, characterised by a very low signal to noise ratio (SNR), reproducing a PD pulse corrupted by external interferences and noise, in order to show the effectiveness of the proposed method.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129568547","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311971
R. Jongen, P. Morshuis, J. Smit, A. Janssen, E. Gulski
In the 1960's up to the 1980's a very compact oil-filled switchgear assembly was installed in the 50 kV networks of different utilities in the Netherlands. Per bay the switchgear consists of different oil-filled compartments where the high voltage parts are supported and connected from one compartment to the other by epoxy resin bushings. The population of this type of bushing is relative large. The number of failures however is low, and most of them occurred in the early nineties. This initiated a concern about the possibility of an oncoming re-investment wave due to replacement of this type of circuit breaker. In this contribution a statistical analysis of failure data was performed for failure prediction in the future. From the statistical analysis it can be concluded that the bushings are in the wear-out life period of the bathtub curve. However, the relative low value of the shape parameter indicates that the ageing process is in its early stage. If the failure rate function obtained from the analysis is compared with the population in service, than the total population can be stated as young. With the analysis an estimate is made of the expected number of failures in coming years, which can help the asset manager to determine if action has to be taken to meet the business policy
{"title":"Statistical analysis of in service failed epoxy resin bushings in a 50 kV switchgear assembly","authors":"R. Jongen, P. Morshuis, J. Smit, A. Janssen, E. Gulski","doi":"10.1109/CEIDP.2006.311971","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311971","url":null,"abstract":"In the 1960's up to the 1980's a very compact oil-filled switchgear assembly was installed in the 50 kV networks of different utilities in the Netherlands. Per bay the switchgear consists of different oil-filled compartments where the high voltage parts are supported and connected from one compartment to the other by epoxy resin bushings. The population of this type of bushing is relative large. The number of failures however is low, and most of them occurred in the early nineties. This initiated a concern about the possibility of an oncoming re-investment wave due to replacement of this type of circuit breaker. In this contribution a statistical analysis of failure data was performed for failure prediction in the future. From the statistical analysis it can be concluded that the bushings are in the wear-out life period of the bathtub curve. However, the relative low value of the shape parameter indicates that the ageing process is in its early stage. If the failure rate function obtained from the analysis is compared with the population in service, than the total population can be stated as young. With the analysis an estimate is made of the expected number of failures in coming years, which can help the asset manager to determine if action has to be taken to meet the business policy","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129860470","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311939
M. Frechette, R. Larocque, M. Lessard, M. Trudeau, R. Veillette, K. Cole, M.T. Ton That
Samples of a nanodielectric material were synthesized. This bulk material was a mix of epoxy resin, a SiO2 load and a small fraction of inorganic nanoparticles. The present experiment aimed at determining the effect of the degree of exfoliation on the performance of the nanodielectric surface when exposed to partial discharges. It was found that when the degree of intercalation/exfoliation of the nanoclay is low, the nanodielectric surface did not exhibit superior performance compared to that not containing nanoclay.
{"title":"On the degree of exfoliation affecting the corona performance of a nanodielectric surface","authors":"M. Frechette, R. Larocque, M. Lessard, M. Trudeau, R. Veillette, K. Cole, M.T. Ton That","doi":"10.1109/CEIDP.2006.311939","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311939","url":null,"abstract":"Samples of a nanodielectric material were synthesized. This bulk material was a mix of epoxy resin, a SiO2 load and a small fraction of inorganic nanoparticles. The present experiment aimed at determining the effect of the degree of exfoliation on the performance of the nanodielectric surface when exposed to partial discharges. It was found that when the degree of intercalation/exfoliation of the nanoclay is low, the nanodielectric surface did not exhibit superior performance compared to that not containing nanoclay.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129939576","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：