Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772923
Luo Wei, Zhang Ruobing, W. Liming, Chen Jie, Guan Zhicheng, L. Xiaojun, Mo Mengbin
Pulsed electric field is a novel non-thermal process technology. It could be applied in the extraction of functional components from plant for its irreversible disintegration on plant cell membrane. PEF treatment caused an irreversible disintegration on the cellular membrane of raspberry cell and the extraction yield of anthocyanins from raspberry was linearly correlated to the treatment pulses of PEF. During the extraction, Cyanidin-3-glucoside, the major anthocyanins in raspberry was found to be significantly degraded by PEF. The degradation effects of Cyanidin-3-glucoside decreased with the increase of the electric field or treatment time. In the spectra curves of Cyanidin-3-glucoside treated by PEF, the intensity of the peak at 333 nm increased as electric field and treatment time increased, while the intensity of the peak at 519 nm and the shoulder at 430 nm decreased, indicating Cyanidin-3-glucoside was degraded into chalcone.
{"title":"Effects of PEF-assisted extraction of anthocyanin in red raspberry","authors":"Luo Wei, Zhang Ruobing, W. Liming, Chen Jie, Guan Zhicheng, L. Xiaojun, Mo Mengbin","doi":"10.1109/CEIDP.2008.4772923","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772923","url":null,"abstract":"Pulsed electric field is a novel non-thermal process technology. It could be applied in the extraction of functional components from plant for its irreversible disintegration on plant cell membrane. PEF treatment caused an irreversible disintegration on the cellular membrane of raspberry cell and the extraction yield of anthocyanins from raspberry was linearly correlated to the treatment pulses of PEF. During the extraction, Cyanidin-3-glucoside, the major anthocyanins in raspberry was found to be significantly degraded by PEF. The degradation effects of Cyanidin-3-glucoside decreased with the increase of the electric field or treatment time. In the spectra curves of Cyanidin-3-glucoside treated by PEF, the intensity of the peak at 333 nm increased as electric field and treatment time increased, while the intensity of the peak at 519 nm and the shoulder at 430 nm decreased, indicating Cyanidin-3-glucoside was degraded into chalcone.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84652933","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772786
C. Desai, K. Brown, M. Desmulliez, A. Sutherland
Electrical wiring and interconnected systems (EWIS) have become a major area of research and development for variety of industries. A variety of factors lead to catastrophic failure described. Here partial discharge (PD) analysis methods for diagnosing aircraft wiring faults are explored since PD signals are strongly correlated with the defects that produce them and form an ideal part for prognostic and diagnostic test system. A simulation of PD signal based on high-voltage insulation testing standard is detailed. Wavelet based (time-frequency) analysis is shown to be a good approach to de-noise PD signals. Leading to an overall set of conclusions and on-going work.
{"title":"Selection of Wavelet for De-noising PD waveforms for Prognostics and Diagnostics of Aircraft Wiring","authors":"C. Desai, K. Brown, M. Desmulliez, A. Sutherland","doi":"10.1109/CEIDP.2008.4772786","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772786","url":null,"abstract":"Electrical wiring and interconnected systems (EWIS) have become a major area of research and development for variety of industries. A variety of factors lead to catastrophic failure described. Here partial discharge (PD) analysis methods for diagnosing aircraft wiring faults are explored since PD signals are strongly correlated with the defects that produce them and form an ideal part for prognostic and diagnostic test system. A simulation of PD signal based on high-voltage insulation testing standard is detailed. Wavelet based (time-frequency) analysis is shown to be a good approach to de-noise PD signals. Leading to an overall set of conclusions and on-going work.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79879430","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772876
Wei Wang, Chengrong Li, Yitao Jiang, Guohua Cui, Z. Tang
To research the availability of PD detection for C-GIS by using UHF method, a UHF detection system has been set up, a special coupling port has been constructed and floating PD failure model has been simulated. The results show, it is availabe to detect the PD in C-GIS by using UHF method. The UHF method's anti-injecting has been confirmed too.
{"title":"The Research on PD Detection for C-GIS by using UHF Method","authors":"Wei Wang, Chengrong Li, Yitao Jiang, Guohua Cui, Z. Tang","doi":"10.1109/CEIDP.2008.4772876","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772876","url":null,"abstract":"To research the availability of PD detection for C-GIS by using UHF method, a UHF detection system has been set up, a special coupling port has been constructed and floating PD failure model has been simulated. The results show, it is availabe to detect the PD in C-GIS by using UHF method. The UHF method's anti-injecting has been confirmed too.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87078444","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772921
Fan Youbin, Meng Shaoxin, Mi Fugui, Zhang Li, Lanqin Geng, Fan Yungang, Zhou Yunjie, Li Yu
For the clustered layout of power cable, the steady current rating of MV or LV XLPE cable in different laying status, in different temperatures of circumvents, and in different soil thermal resistances, was calculated according to the IEC 60287 standard. The effect of the temperature and the accuracy of soil resistance coefficient estimation with regards to the final results are also investigated. The result shows the coefficient of soil resistance plays the most important role in the current rating for cable in a clustered layout. Selecting an appropriate soil component is an important method to increase the current rating.
{"title":"Calculation of Current Rating for Medium and Low Voltage XLPE Cable in Clustered Layout","authors":"Fan Youbin, Meng Shaoxin, Mi Fugui, Zhang Li, Lanqin Geng, Fan Yungang, Zhou Yunjie, Li Yu","doi":"10.1109/CEIDP.2008.4772921","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772921","url":null,"abstract":"For the clustered layout of power cable, the steady current rating of MV or LV XLPE cable in different laying status, in different temperatures of circumvents, and in different soil thermal resistances, was calculated according to the IEC 60287 standard. The effect of the temperature and the accuracy of soil resistance coefficient estimation with regards to the final results are also investigated. The result shows the coefficient of soil resistance plays the most important role in the current rating for cable in a clustered layout. Selecting an appropriate soil component is an important method to increase the current rating.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78550610","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772792
H. Nakamura, T. Oono, Y. Mizuno
Short circuit of a stator winding is one of the most probable faults of induction motors, resulting in huge economical loss by stopping of production lines in industrial plants and factories. Establishment of an easy and effective fault diagnosis method has been strongly required to assure motors for operation with high reliability. This paper reports the results of analysis of current waveforms of motors with short-circuit turns in stator windings. It was confirmed that magnitude and phase of current changed depending on the degree of short circuit of the stator winding under both no load and load-connected conditions. It is suggested that current waveform is suitable for detection of short circuit fault of induction motors.
{"title":"Analysis of Current Waveforms of Induction Motors with Short Circuit Faults","authors":"H. Nakamura, T. Oono, Y. Mizuno","doi":"10.1109/CEIDP.2008.4772792","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772792","url":null,"abstract":"Short circuit of a stator winding is one of the most probable faults of induction motors, resulting in huge economical loss by stopping of production lines in industrial plants and factories. Establishment of an easy and effective fault diagnosis method has been strongly required to assure motors for operation with high reliability. This paper reports the results of analysis of current waveforms of motors with short-circuit turns in stator windings. It was confirmed that magnitude and phase of current changed depending on the degree of short circuit of the stator winding under both no load and load-connected conditions. It is suggested that current waveform is suitable for detection of short circuit fault of induction motors.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80768896","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772926
T. Takahashi, T. Okamoto
6 to 60 kV class XLPE cables are widely used and playing important roles in power distribution and transmission systems in Japan. The aging degradation is dominated by water trees in these XLPE cables. Therefore, water tree diagnosis with high precision is quite important for operation, maintenance and replaces planning of these XLPE cables. The authors have been investigating the applicability of the Damping oscillating high voltage (DOHV) to the water tree detection as well as insulation diagnosis for these XLPE cables. This paper firstly proposes the nondestructive insulation diagnosis using DOHV application. Then, some empirical results obtained by its application to water-tree degraded XLPE cable are discussed.
{"title":"Insulation Diagnosis for XLPE Cables Using Damping Oscillating High Voltage","authors":"T. Takahashi, T. Okamoto","doi":"10.1109/CEIDP.2008.4772926","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772926","url":null,"abstract":"6 to 60 kV class XLPE cables are widely used and playing important roles in power distribution and transmission systems in Japan. The aging degradation is dominated by water trees in these XLPE cables. Therefore, water tree diagnosis with high precision is quite important for operation, maintenance and replaces planning of these XLPE cables. The authors have been investigating the applicability of the Damping oscillating high voltage (DOHV) to the water tree detection as well as insulation diagnosis for these XLPE cables. This paper firstly proposes the nondestructive insulation diagnosis using DOHV application. Then, some empirical results obtained by its application to water-tree degraded XLPE cable are discussed.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80187906","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772804
S. Singha, M. Thomas
Experimental studies reveal a reduction in the values of permittivity for epoxy nanocomposites at low filler loadings as compared to neat epoxy over a wide frequency range. This permittivity reduction is attributed to the interaction dynamics between nanoparticles and epoxy chains at the interface region and interestingly, this interaction has also been found to influence the glass transition temperatures (Tg) of the examined nanocomposite systems. Accordingly, a dual nanolayer interface model for an epoxy based nanocomposite system is analyzed to explain the obtained permittivity characteristics.
{"title":"Reduction of Permittivity in Epoxy Nanocomposites at Low Nano-filler Loadings","authors":"S. Singha, M. Thomas","doi":"10.1109/CEIDP.2008.4772804","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772804","url":null,"abstract":"Experimental studies reveal a reduction in the values of permittivity for epoxy nanocomposites at low filler loadings as compared to neat epoxy over a wide frequency range. This permittivity reduction is attributed to the interaction dynamics between nanoparticles and epoxy chains at the interface region and interestingly, this interaction has also been found to influence the glass transition temperatures (Tg) of the examined nanocomposite systems. Accordingly, a dual nanolayer interface model for an epoxy based nanocomposite system is analyzed to explain the obtained permittivity characteristics.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80240079","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772800
M. Ansari, G. Gurumurthy, J. Amarnath
Very fast transient voltage behavior of power transformer winding sections can be improved by providing suitable metal oxide surge absorber (MOA) blocks across sections of the windings. Computer simulations have been carried out to investigate surge voltage performance of these type of windings for appearance of 1.2/50 microseconds wave shape, full and chopped impulse voltages at line terminal. Transformer windings with alpha (Square root of ratio of total ground capacitance to total series capacitance of the winding) values in range of 6 to 18 have been analyzed. Results of studies carried out to identify presence of faults in winding section due to appearance of full and chopped impulse voltage waves with MOA blocks provided across all winding sections are reported in this paper.
{"title":"Simulation of Power Transformer Winding Sections Provided with Metal Oxide Surge Absorber Blocks Using Full and Chopped Impulse Voltage Waves","authors":"M. Ansari, G. Gurumurthy, J. Amarnath","doi":"10.1109/CEIDP.2008.4772800","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772800","url":null,"abstract":"Very fast transient voltage behavior of power transformer winding sections can be improved by providing suitable metal oxide surge absorber (MOA) blocks across sections of the windings. Computer simulations have been carried out to investigate surge voltage performance of these type of windings for appearance of 1.2/50 microseconds wave shape, full and chopped impulse voltages at line terminal. Transformer windings with alpha (Square root of ratio of total ground capacitance to total series capacitance of the winding) values in range of 6 to 18 have been analyzed. Results of studies carried out to identify presence of faults in winding section due to appearance of full and chopped impulse voltage waves with MOA blocks provided across all winding sections are reported in this paper.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73623063","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772892
T. Andritsch, A. Lunding, P. Morshuis, H. Negle, J. Smit
Following previous work, this paper focuses on a new type of epoxy based syntactic foam, a lightweight material which is known to electrical engineering since the seventies, but so far couldn't live up to it's potential in high voltage applications. This is mainly because of the basic structure of syntactic foam, which provides closed cell porosity. The porosity, which gives syntactic foam its weight reduction, unfortunately leads to shortcomings in terms of dielectric strength and PD resistance. However: with recent advances in material science and the dawn of nanotechnology, there is a new take on this unique material, which can be used as insulating material for HV-applications, where weight is of vital importance. Four different types of epoxy based syntactic foam nanocomposites are presented, whose respective dielectric behavior were studied with help of dielectric spectroscopy. The measurement results, with emphasis on the complex permittivity, are presented in this work. Also the advantages and shortcomings of the various composites are discussed, as they are compared with both unmodified syntactic foam, as well as the unmodified base epoxy.
{"title":"Permittivity in Epoxy based Syntactic Foam Nanocomposites","authors":"T. Andritsch, A. Lunding, P. Morshuis, H. Negle, J. Smit","doi":"10.1109/CEIDP.2008.4772892","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772892","url":null,"abstract":"Following previous work, this paper focuses on a new type of epoxy based syntactic foam, a lightweight material which is known to electrical engineering since the seventies, but so far couldn't live up to it's potential in high voltage applications. This is mainly because of the basic structure of syntactic foam, which provides closed cell porosity. The porosity, which gives syntactic foam its weight reduction, unfortunately leads to shortcomings in terms of dielectric strength and PD resistance. However: with recent advances in material science and the dawn of nanotechnology, there is a new take on this unique material, which can be used as insulating material for HV-applications, where weight is of vital importance. Four different types of epoxy based syntactic foam nanocomposites are presented, whose respective dielectric behavior were studied with help of dielectric spectroscopy. The measurement results, with emphasis on the complex permittivity, are presented in this work. Also the advantages and shortcomings of the various composites are discussed, as they are compared with both unmodified syntactic foam, as well as the unmodified base epoxy.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74265154","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 : 2008-10-01DOI: 10.1109/CEIDP.2008.4772939
Jian Li, Changkui Cheng, S. Grzybowski
This paper presents an adaptive wavelet thresholding algorithm for de-noising of ultra-high-frequency (UHF) signals of partial discharges (PD). The wavelet de-nosing algorithm is based on an optimum and adaptive shrinkage scheme. A class of shrinkage functions with continuous derivatives and a genetic algorithm are used for the adaptive shrinkage scheme. The genetic algorithm is helpful to obtain global optimum thresholds and to reduce much time wasted by the adaptive searching computation. The de-noising results of PD UHF signals embedded in white noises are presented. The PD UHF signals denoised by the adaptive wavelet thresholding algorithm have smaller distortion in waveform than the signals de-noised by the soft thresholding algorithms.
{"title":"Wavelet De-Noising for PD UHF Signals Based on Adaptive Thresholding by Genetic Algorithm","authors":"Jian Li, Changkui Cheng, S. Grzybowski","doi":"10.1109/CEIDP.2008.4772939","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772939","url":null,"abstract":"This paper presents an adaptive wavelet thresholding algorithm for de-noising of ultra-high-frequency (UHF) signals of partial discharges (PD). The wavelet de-nosing algorithm is based on an optimum and adaptive shrinkage scheme. A class of shrinkage functions with continuous derivatives and a genetic algorithm are used for the adaptive shrinkage scheme. The genetic algorithm is helpful to obtain global optimum thresholds and to reduce much time wasted by the adaptive searching computation. The de-noising results of PD UHF signals embedded in white noises are presented. The PD UHF signals denoised by the adaptive wavelet thresholding algorithm have smaller distortion in waveform than the signals de-noised by the soft thresholding algorithms.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73995388","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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