Pub Date : 2008-10-01DOI: 10.1109/CEIDP.2008.4772900
P. A. Vázquez, G. Georghiou, A. Castellanos
We study the two-dimensional electroconvection between two plates from the theoretical and numerical point of view. We use two sets of numerical techniques to analyze this problem. On one hand, Particle-in-Cell techniques for simulating the charge distribution combined with Finite Elements for computing the velocity and electrical fields. On the other hand, Flux Corrected Transport for the charge and Finite Elements for the fields. We perform numerical simulations both for weak and strong injection beyond the linear stability threshold. The results seem to indicate that the one-roll finite amplitude solution assumed in previous both linear and non-linear stability analysis is not always stable.
{"title":"Numerical study of the time evolution of finite amplitude electroconvection between two plates using PIC-FE and FCT-FE","authors":"P. A. Vázquez, G. Georghiou, A. Castellanos","doi":"10.1109/CEIDP.2008.4772900","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772900","url":null,"abstract":"We study the two-dimensional electroconvection between two plates from the theoretical and numerical point of view. We use two sets of numerical techniques to analyze this problem. On one hand, Particle-in-Cell techniques for simulating the charge distribution combined with Finite Elements for computing the velocity and electrical fields. On the other hand, Flux Corrected Transport for the charge and Finite Elements for the fields. We perform numerical simulations both for weak and strong injection beyond the linear stability threshold. The results seem to indicate that the one-roll finite amplitude solution assumed in previous both linear and non-linear stability analysis is not always stable.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"55 1","pages":"176-179"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74953649","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.2008.4772832
S. Zelmat, S. Diaham, M. Decup, M. Locatelli, T. Lebey
In spite of the growing maturity of silicon carbide (SiC) technology, several difficulties still remain and limit its use for high temperature applications up to 200degC. Due to its excellent physical properties, SiC material offers the ability to design electronic devices working at junction (or ambient) temperature and at power level much higher than those of the present silicon based semiconductors. Thus, the environment of the SiC die will endure severe electrical and thermal stresses. Particularly, the passivation layer must present good thermal stability of its dielectric strength, which must remain high enough to ensure a proper electrical insulation on top of the SiC surface. In this study, polyimide material has been chosen as a candidate for SiC power device passivation. This paper presents the changes of the dielectric strength of a BPDA/PPD polyimide for temperatures ranging up to 400degC.
{"title":"Weibull Statistical Dielectric Breakdown in Polyimide up to 400°C","authors":"S. Zelmat, S. Diaham, M. Decup, M. Locatelli, T. Lebey","doi":"10.1109/CEIDP.2008.4772832","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772832","url":null,"abstract":"In spite of the growing maturity of silicon carbide (SiC) technology, several difficulties still remain and limit its use for high temperature applications up to 200degC. Due to its excellent physical properties, SiC material offers the ability to design electronic devices working at junction (or ambient) temperature and at power level much higher than those of the present silicon based semiconductors. Thus, the environment of the SiC die will endure severe electrical and thermal stresses. Particularly, the passivation layer must present good thermal stability of its dielectric strength, which must remain high enough to ensure a proper electrical insulation on top of the SiC surface. In this study, polyimide material has been chosen as a candidate for SiC power device passivation. This paper presents the changes of the dielectric strength of a BPDA/PPD polyimide for temperatures ranging up to 400degC.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"428 2 1","pages":"583-586"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77863707","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.2008.4772790
V. Mentlík, J. Michalik, R. Polanský, P. Prosr, M. Brandt
Power transformer service availability is influenced by a condition of insulating and cooling medium - by transformer oil properties. The transformer is subjected to many untypical situations arising casually or due to changed operation conditions. Between the casual phenomena belongs e.g. an unbalanced loading, which causes phases overload etc. These situations reflect on the properties of cooling medium. Parameters such as an excessive formation of gasses in transformer oil, an increase of water presence in the oil or changes of temperature distribution along the winding of transformer can be changed during the operation. Monitoring of these changes is performed in our experimental department, which was developed directly for this purpose. Tested transformer is equipped with sensors for mentioned parameters monitoring. Information obtained from laboratory testing of the experimental transformer will be useful for assessment of processes proceeding in common operation of these devices.
{"title":"Property Changes of Transformer Oil during Limiting States of Transformer","authors":"V. Mentlík, J. Michalik, R. Polanský, P. Prosr, M. Brandt","doi":"10.1109/CEIDP.2008.4772790","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772790","url":null,"abstract":"Power transformer service availability is influenced by a condition of insulating and cooling medium - by transformer oil properties. The transformer is subjected to many untypical situations arising casually or due to changed operation conditions. Between the casual phenomena belongs e.g. an unbalanced loading, which causes phases overload etc. These situations reflect on the properties of cooling medium. Parameters such as an excessive formation of gasses in transformer oil, an increase of water presence in the oil or changes of temperature distribution along the winding of transformer can be changed during the operation. Monitoring of these changes is performed in our experimental department, which was developed directly for this purpose. Tested transformer is equipped with sensors for mentioned parameters monitoring. Information obtained from laboratory testing of the experimental transformer will be useful for assessment of processes proceeding in common operation of these devices.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"73 1","pages":"309-312"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80957897","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.2008.4772912
Wei Wang, Bing An, Chengrong Li, B. Luo, Xiaolin Li, Yixu Wang, Fei Fan, Boo-gen Yang
To research the effect of temperature and humidity on radio interference generated from UHV DC transmission lines, a mini corona cage has been constructed and put in a manual environment room, which temperature and humidity can be controlled. At the same time, a radio interference performance measuring system by using loop method has been set up too. The radio interference generated from a copper line have been measured in a mini corona cage not only at different humidity from 30% to 99% at 20 but also at different temperature from 0 to 30. The relationship between radio interference level and temperature and humidity have been achieved.
{"title":"The Effect of Temperature and Humidity on Radio Interference Generated from UHV DC Transmission Lines","authors":"Wei Wang, Bing An, Chengrong Li, B. Luo, Xiaolin Li, Yixu Wang, Fei Fan, Boo-gen Yang","doi":"10.1109/CEIDP.2008.4772912","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772912","url":null,"abstract":"To research the effect of temperature and humidity on radio interference generated from UHV DC transmission lines, a mini corona cage has been constructed and put in a manual environment room, which temperature and humidity can be controlled. At the same time, a radio interference performance measuring system by using loop method has been set up too. The radio interference generated from a copper line have been measured in a mini corona cage not only at different humidity from 30% to 99% at 20 but also at different temperature from 0 to 30. The relationship between radio interference level and temperature and humidity have been achieved.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"290-292"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83077289","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.2008.4772821
M. Higashikoji, M. Motoyama, S. Ohtsuka, M. Hikita, H. Ikeda, J. Gavillet, G. Ravel, E. da Silva, M. Frechette
We have so far performed multistress acceleration test (EdF Test:) for SiR (silicone rubber) insulators, which were found to still keep good hydrophobicity even after 5000 hour testing time equivalent to about 10 years for outdoor exposure test in a heavy polluted area [1]. The two tests' results indicate that one should consider non-soluble material in an accelerated pollution test so as to exactly simulate the practical conditions. From this point of view, we have developed a new automatic artificial pollution acceleration test system (AAPATS) which incorporates non-soluble material pollution to cause hydrophobicity decrease of the surface of SiR under virtually practical environments [2]. We evaluated non-soluble material pollution characteristics of SiR finished with various surface nano-coating processings aiming to enhance hydrophobicity of the material suffering from repeated pollution for a long term. The surface of material in the form of plates was treated with nano-coating by plasma enhanced chemical vapor deposition (PECVD). In this paper, we investigate hydrophobicity improvement properties of SiR material with the surface nanocoating treatment after suffering the repeated non-soluble material pollution by AAPATS.
{"title":"Evaluation of Pollution Characteristic of Polymer Insulating Material with Surface Nano-Coating by a New Automatic Artificial Pollution Acceleration Test System","authors":"M. Higashikoji, M. Motoyama, S. Ohtsuka, M. Hikita, H. Ikeda, J. Gavillet, G. Ravel, E. da Silva, M. Frechette","doi":"10.1109/CEIDP.2008.4772821","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772821","url":null,"abstract":"We have so far performed multistress acceleration test (EdF Test:) for SiR (silicone rubber) insulators, which were found to still keep good hydrophobicity even after 5000 hour testing time equivalent to about 10 years for outdoor exposure test in a heavy polluted area [1]. The two tests' results indicate that one should consider non-soluble material in an accelerated pollution test so as to exactly simulate the practical conditions. From this point of view, we have developed a new automatic artificial pollution acceleration test system (AAPATS) which incorporates non-soluble material pollution to cause hydrophobicity decrease of the surface of SiR under virtually practical environments [2]. We evaluated non-soluble material pollution characteristics of SiR finished with various surface nano-coating processings aiming to enhance hydrophobicity of the material suffering from repeated pollution for a long term. The surface of material in the form of plates was treated with nano-coating by plasma enhanced chemical vapor deposition (PECVD). In this paper, we investigate hydrophobicity improvement properties of SiR material with the surface nanocoating treatment after suffering the repeated non-soluble material pollution by AAPATS.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"26 1","pages":"212-215"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87141103","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.2008.4772791
V. Griseri, C. Perrin, C. Laurent
Different detection systems based on the pulsed electro acoustic (PEA) method have been developed in the last past few years to study space charge distribution in electron irradiated materials. In particular, a set-up working in contact less mode allowing the measurement to be done in open-circuit (where one surface of the irradiated sample is at a floating potential, so-called "open PEA") has been put forward recently. A reference signal is required in any case in order to get quantitative data. The calibration protocol adopted in the case of the classical PEA method, where the sample is under short-circuit condition, cannot be used any more in the "open" configuration. This paper deals with the description and validation of the procedure used to record a proper reference signal to treat raw data obtained with the "open PEA" set-up. Results recorded under various conditions will be compared.
{"title":"Calibration method used for measurements with an open PEA set-up","authors":"V. Griseri, C. Perrin, C. Laurent","doi":"10.1109/CEIDP.2008.4772791","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772791","url":null,"abstract":"Different detection systems based on the pulsed electro acoustic (PEA) method have been developed in the last past few years to study space charge distribution in electron irradiated materials. In particular, a set-up working in contact less mode allowing the measurement to be done in open-circuit (where one surface of the irradiated sample is at a floating potential, so-called \"open PEA\") has been put forward recently. A reference signal is required in any case in order to get quantitative data. The calibration protocol adopted in the case of the classical PEA method, where the sample is under short-circuit condition, cannot be used any more in the \"open\" configuration. This paper deals with the description and validation of the procedure used to record a proper reference signal to treat raw data obtained with the \"open PEA\" set-up. Results recorded under various conditions will be compared.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"44 1","pages":"133-136"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89316741","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.2008.4772815
A. Nekahi, M. Farzaneh, C. Volat, W. Chisholm
Emission spectroscopic technique has been used to record the spectrum of the emitted light from an arc formed on an ice surface. The excitation temperature of the arc column was determined using the intensities of the spectral lines of NII and employing the Boltzmann method. The electron density was also estimated from the Stark broadening of the Balmer line Hg. The temperature and the density of electrons in the arc column for the selected setup were calculated to be about 2 eV and 4 times 1017 cm-3 respectively.
{"title":"Electron Density and Temperature Measurement of Arc on an Ice Surface","authors":"A. Nekahi, M. Farzaneh, C. Volat, W. Chisholm","doi":"10.1109/CEIDP.2008.4772815","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772815","url":null,"abstract":"Emission spectroscopic technique has been used to record the spectrum of the emitted light from an arc formed on an ice surface. The excitation temperature of the arc column was determined using the intensities of the spectral lines of NII and employing the Boltzmann method. The electron density was also estimated from the Stark broadening of the Balmer line Hg. The temperature and the density of electrons in the arc column for the selected setup were calculated to be about 2 eV and 4 times 1017 cm-3 respectively.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"28 1","pages":"658-661"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85874168","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.2008.4772773
S. Hikosaka, H. Ishikawa, Y. Ohki
Recently poly(L-lactide) synthesized from starch is attracting much attention as a biodegradable polymer. In this paper, effects of crystallinity on dielectric properties of PLLA were studied by preparing four kinds of PLLA samples with different crystallinities. A thermally stimulated polarization current (TSPC) peak was found to appear in all the samples at temperatures around 65 to 70degC, which is due to the glass transition. The magnitude of the TSPC peak was found to be in the reverse order of crystallinity. This is presumably because the segmental-mode relaxation, which brings about the TSPC, is restricted more as the crystallinity increases. All the samples show two thermally stimulated depolarization current (TSDC) peaks at around 65degC and around 90 to 100degC. The lower-temperature peak seems to be due to the segmental-mode relaxation, while the other due to the normal-mode relaxation. Moreover, all the samples show a drastic increase in the real part of complex permittivity and have a peak in its imaginary part at frequencies from 10-1 to 104 Hz, depending on the measurement temperature. The crystallinity dependencies of the two parts are similar to those of the TSPC and TSDC peaks around 65 to 70degC. Therefore, the increase in the real part and the peak in the imaginary part are ascribable to the segmental-mode relaxation.
{"title":"Effects of Crystallinity on Thermally Stimulated Current and Complex Permittivity of Poly(L-lactide)","authors":"S. Hikosaka, H. Ishikawa, Y. Ohki","doi":"10.1109/CEIDP.2008.4772773","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772773","url":null,"abstract":"Recently poly(L-lactide) synthesized from starch is attracting much attention as a biodegradable polymer. In this paper, effects of crystallinity on dielectric properties of PLLA were studied by preparing four kinds of PLLA samples with different crystallinities. A thermally stimulated polarization current (TSPC) peak was found to appear in all the samples at temperatures around 65 to 70degC, which is due to the glass transition. The magnitude of the TSPC peak was found to be in the reverse order of crystallinity. This is presumably because the segmental-mode relaxation, which brings about the TSPC, is restricted more as the crystallinity increases. All the samples show two thermally stimulated depolarization current (TSDC) peaks at around 65degC and around 90 to 100degC. The lower-temperature peak seems to be due to the segmental-mode relaxation, while the other due to the normal-mode relaxation. Moreover, all the samples show a drastic increase in the real part of complex permittivity and have a peak in its imaginary part at frequencies from 10-1 to 104 Hz, depending on the measurement temperature. The crystallinity dependencies of the two parts are similar to those of the TSPC and TSDC peaks around 65 to 70degC. Therefore, the increase in the real part and the peak in the imaginary part are ascribable to the segmental-mode relaxation.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"8 1","pages":"497-500"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85993962","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.2008.4772901
J. Ramirez, J. Sanz, E. da Silva, M. Martínez, J. Rodriguez
In this paper the space charge distribution profile along the thickness of tree-retardant crosslinked polyethylene (TR-XLPE) cables, commonly used in medium voltage system and degraded under multiple factors as temperature, AC and impulse voltages are presented. A comparison of the space charge distribution along the insulation thickness (radial direction) of samples extracted from 15 kV TR-XLPE cables, 2 AWG Cu conductor, manufactured under dry curing process was done. Two 7 m long cable samples were submitted to accelerated ageing; one sample was under thermal stress and the other was under electrothermal factors combining thermal cycles with 25 kV AC voltage applied continuously and impulse voltage transients. Looking at the results it can be concluded that after the first thermal cycle the space charge is reduced in comparison with the profile of the new sample. This confirms that crosslink by-products are expelled under thermal treatments. The space charge density is higher in the central region of the insulator thickness of the new sample and aged samples as well. It is also evident that the electrothermal ageing cycle is more severe because it releases more quantity of space charge along the insulation thickness than the thermal one.
{"title":"Space Charge Profile of TR-XLPE Cables Aged Under Multiple Stresses","authors":"J. Ramirez, J. Sanz, E. da Silva, M. Martínez, J. Rodriguez","doi":"10.1109/CEIDP.2008.4772901","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772901","url":null,"abstract":"In this paper the space charge distribution profile along the thickness of tree-retardant crosslinked polyethylene (TR-XLPE) cables, commonly used in medium voltage system and degraded under multiple factors as temperature, AC and impulse voltages are presented. A comparison of the space charge distribution along the insulation thickness (radial direction) of samples extracted from 15 kV TR-XLPE cables, 2 AWG Cu conductor, manufactured under dry curing process was done. Two 7 m long cable samples were submitted to accelerated ageing; one sample was under thermal stress and the other was under electrothermal factors combining thermal cycles with 25 kV AC voltage applied continuously and impulse voltage transients. Looking at the results it can be concluded that after the first thermal cycle the space charge is reduced in comparison with the profile of the new sample. This confirms that crosslink by-products are expelled under thermal treatments. The space charge density is higher in the central region of the insulator thickness of the new sample and aged samples as well. It is also evident that the electrothermal ageing cycle is more severe because it releases more quantity of space charge along the insulation thickness than the thermal one.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"2 1","pages":"333-336"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83836203","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.2008.4772852
S. Sebo, R. Otte, J. Moore
Dielectric caps are used as wildlife protection measures on a new line of switching devices in order to satisfy service continuity needs and environmental requirements. Fog chamber tests were used to check and evaluate the performance of six different wildlife protection caps, positioned on their insulators, and outfitted with the appropriate connecting cables. The length of the test cycle was three weeks. During their performance evaluation, the energized insulators were exposed cyclically to salt fog. The energizing voltage was (27/1.73) = 15.6 kV(rms). Deionized water was used to produce the salt fog, with appropriate amount of salt added, to simulate a "heavy" contamination environment. The six insulators together with their caps were energized continuously for 24 hours a day, 7 days a week. The performance of two dielectric caps satisfied the expectations. The performance of dielectric caps made of various materials, and the design of the caps in terms of their shape and other aspects are described.
{"title":"Improving the Performance of a Wildlife Protection Cap by the Use of Salt Fog Testing","authors":"S. Sebo, R. Otte, J. Moore","doi":"10.1109/CEIDP.2008.4772852","DOIUrl":"https://doi.org/10.1109/CEIDP.2008.4772852","url":null,"abstract":"Dielectric caps are used as wildlife protection measures on a new line of switching devices in order to satisfy service continuity needs and environmental requirements. Fog chamber tests were used to check and evaluate the performance of six different wildlife protection caps, positioned on their insulators, and outfitted with the appropriate connecting cables. The length of the test cycle was three weeks. During their performance evaluation, the energized insulators were exposed cyclically to salt fog. The energizing voltage was (27/1.73) = 15.6 kV(rms). Deionized water was used to produce the salt fog, with appropriate amount of salt added, to simulate a \"heavy\" contamination environment. The six insulators together with their caps were energized continuously for 24 hours a day, 7 days a week. The performance of two dielectric caps satisfied the expectations. The performance of dielectric caps made of various materials, and the design of the caps in terms of their shape and other aspects are described.","PeriodicalId":6381,"journal":{"name":"2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"33 1","pages":"259-262"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78683918","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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