Pub Date : 2013-12-01DOI: 10.1109/CEIDP.2013.6748120
M. Musa, Y. Arief, Z. Abdul-Malek, M. H. Ahmad, A. Jamil
Electrical tree is recognized as one of the pre-breakdown phenomena that occurs in high voltage insulation material. In addition, under high divergent field, the electrical tree grows rapidly and severely which may cause the breakdown of insulation to occur. In view of foregoing, nano-filler was added into the base insulating materials to enhance their properties against the growth of electrical tree. Thus in this study, nano-titanium dioxide was chosen as filler in order to improve the characteristics of silicone rubber which in turn inhibits the growth of electrical tree. The test samples were prepared in the form of leaf-like specimen. Nano-titanium dioxide was chosen as filler in order to improve the characteristics of silicone rubber. The number of partial discharge occurrence, partial discharge magnitude and breakdown time of the nanocomposites were investigated under different percentage of nano-titanium dioxide. The applied voltage and frequency were fixed at 10 kVrms AC and 50 Hz respectively. Treeing growth was recorded and partial discharge was observed at the constant applied voltage. The findings in this research showed that under high concentration of nano titanium dioxide, the treeing propagation were reduced and partial discharge number increased. The function of nano titanium dioxide as obstacle for the tree path in the silicone rubber samples was successfully tested. The results have shown that physical bonding between nano-titanium dioxide and silicone rubber matrix was improved, the tree propagation speed decreased, and this resulted in the increment of partial discharge magnitude. However, further experimentation is required to give more clarifications regarding to this finding.
{"title":"Influence of nano-titanium dioxide (TiO2) on electrical tree characteristics in silicone rubber based nanocomposite","authors":"M. Musa, Y. Arief, Z. Abdul-Malek, M. H. Ahmad, A. Jamil","doi":"10.1109/CEIDP.2013.6748120","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748120","url":null,"abstract":"Electrical tree is recognized as one of the pre-breakdown phenomena that occurs in high voltage insulation material. In addition, under high divergent field, the electrical tree grows rapidly and severely which may cause the breakdown of insulation to occur. In view of foregoing, nano-filler was added into the base insulating materials to enhance their properties against the growth of electrical tree. Thus in this study, nano-titanium dioxide was chosen as filler in order to improve the characteristics of silicone rubber which in turn inhibits the growth of electrical tree. The test samples were prepared in the form of leaf-like specimen. Nano-titanium dioxide was chosen as filler in order to improve the characteristics of silicone rubber. The number of partial discharge occurrence, partial discharge magnitude and breakdown time of the nanocomposites were investigated under different percentage of nano-titanium dioxide. The applied voltage and frequency were fixed at 10 kVrms AC and 50 Hz respectively. Treeing growth was recorded and partial discharge was observed at the constant applied voltage. The findings in this research showed that under high concentration of nano titanium dioxide, the treeing propagation were reduced and partial discharge number increased. The function of nano titanium dioxide as obstacle for the tree path in the silicone rubber samples was successfully tested. The results have shown that physical bonding between nano-titanium dioxide and silicone rubber matrix was improved, the tree propagation speed decreased, and this resulted in the increment of partial discharge magnitude. However, further experimentation is required to give more clarifications regarding to this finding.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133855874","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 : 2013-12-01DOI: 10.1109/CEIDP.2013.6748209
Pengli Yang, Y. Ohki
Dielectric behavior of a typical liquid crystal polymer Vecstar was studied by measuring its dielectric permittivity, conductivity and other electrical properties. Dielectric spectra are analyzed combined with the thermal properties and thermally stimulated current spectra, and space charge distributions. Complex electrical modulus is introduced in the analysis of the permittivity spectra, which proves to be effective to suppress the effects of large conduction currents at high temperatures. Moreover, the slope of the frequency dependence of εr' is different below and above 160 °C, which indicates that the Maxwell/Wagner polarization occurs inside the sample. The experimental results indicate that both the dielectric relaxation and electrical conduction are closely related with molecular motion and phase transition of the polymer. It is also shown that the polymer is an excellent insulating material in a wide temperature and frequency range.
{"title":"Experimental study on the dielectric properties of a liquid crystal polymer","authors":"Pengli Yang, Y. Ohki","doi":"10.1109/CEIDP.2013.6748209","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748209","url":null,"abstract":"Dielectric behavior of a typical liquid crystal polymer Vecstar was studied by measuring its dielectric permittivity, conductivity and other electrical properties. Dielectric spectra are analyzed combined with the thermal properties and thermally stimulated current spectra, and space charge distributions. Complex electrical modulus is introduced in the analysis of the permittivity spectra, which proves to be effective to suppress the effects of large conduction currents at high temperatures. Moreover, the slope of the frequency dependence of εr' is different below and above 160 °C, which indicates that the Maxwell/Wagner polarization occurs inside the sample. The experimental results indicate that both the dielectric relaxation and electrical conduction are closely related with molecular motion and phase transition of the polymer. It is also shown that the polymer is an excellent insulating material in a wide temperature and frequency range.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131570236","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 : 2013-12-01DOI: 10.1109/CEIDP.2013.6747437
M. Hosobuchi, M. Komatsu, X. Xie, Y. Cheng, Y. Furukawa, Y. Ohki, M. Mizuno, K. Fukunaga
Electrical insulation properties of low density polyethylene (LDPE) are still unclear, especially when it is degraded. In this regard, ultraviolet (UV) photons were irradiated to LDPE sheets at room temperature and 85 °C and their absorption spectra were measured at frequencies from 0.5 to 3.0 THz and from 18 to 105 THz. A very broad absorption band with its peak at around 1.6 THz appears by the UV irradiation. In accord with this appearance, the infrared absorption peak due to a carbonyl structure increases. Quantum chemical calculations were carried out using 3-dimensional models with and without carbonyl groups. As a result, the model with carbonyl groups was found to have optically active modes at about 1.7 THz. From these results, the increase in absorption at 1.6 THz is assumed to be induced by oxidation.
{"title":"Measurements of THz absorption peaks in photo-degraded polyethylene and their assignment by quantum chemical calculations","authors":"M. Hosobuchi, M. Komatsu, X. Xie, Y. Cheng, Y. Furukawa, Y. Ohki, M. Mizuno, K. Fukunaga","doi":"10.1109/CEIDP.2013.6747437","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747437","url":null,"abstract":"Electrical insulation properties of low density polyethylene (LDPE) are still unclear, especially when it is degraded. In this regard, ultraviolet (UV) photons were irradiated to LDPE sheets at room temperature and 85 °C and their absorption spectra were measured at frequencies from 0.5 to 3.0 THz and from 18 to 105 THz. A very broad absorption band with its peak at around 1.6 THz appears by the UV irradiation. In accord with this appearance, the infrared absorption peak due to a carbonyl structure increases. Quantum chemical calculations were carried out using 3-dimensional models with and without carbonyl groups. As a result, the model with carbonyl groups was found to have optically active modes at about 1.7 THz. From these results, the increase in absorption at 1.6 THz is assumed to be induced by oxidation.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124794517","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 : 2013-12-01DOI: 10.1109/CEIDP.2013.6747418
Fuqiang Tian, Y. Ohki
Taking epoxy resin as an example, this research demonstrates that characteristic parameters of charge transport and accumulation are obtainable from complex permittivity spectra by carrying out theoretical analysis based on the electrode polarization theory. The real and imaginary permittivity of the electrode polarization satisfy the Cole-Cole relations well at and above 160 °C. The shape parameter of the Cole-Cole arc is found to be an indication of ion blockage at the electrodes. Both the density and mobility of ions are thermally activated and the sum of the activation energies of these two thermal processes is nearly equal to the activation energy of ac conductivity in the same temperature range. This very reasonable result indicates the adequacy of electrode polarization analysis.
{"title":"Charge transport characteristics in epoxy resin at high temperatures based on electrode polarization analysis","authors":"Fuqiang Tian, Y. Ohki","doi":"10.1109/CEIDP.2013.6747418","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747418","url":null,"abstract":"Taking epoxy resin as an example, this research demonstrates that characteristic parameters of charge transport and accumulation are obtainable from complex permittivity spectra by carrying out theoretical analysis based on the electrode polarization theory. The real and imaginary permittivity of the electrode polarization satisfy the Cole-Cole relations well at and above 160 °C. The shape parameter of the Cole-Cole arc is found to be an indication of ion blockage at the electrodes. Both the density and mobility of ions are thermally activated and the sum of the activation energies of these two thermal processes is nearly equal to the activation energy of ac conductivity in the same temperature range. This very reasonable result indicates the adequacy of electrode polarization analysis.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131065393","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 : 2013-10-23DOI: 10.1109/CEIDP.2013.6748291
Q. Liu, Z. Wang
Secondary Reverse Streamer (SRS) was investigated in a natural ester transformer liquid under standard negative lightning impulse voltage. SRS represents a streamer that occurs well after the termination of the primary streamer (PS) propagation under a single lightning impulse, and it holds an opposite polarity to that of the PS and the impulse voltage. As an example when negative impulses are applied, all the SRSs have positive polarities. Although both streamers' stopping lengths increase with the applied voltage, the stopping length of SRS is always shorter than that of PS. The average propagation velocity of SRS is approximately 1.25 km/s regardless of applied voltages. The maximum light intensity of SRS is lower than that of PS. The formation of SRS is likely caused by the reserve electric filed induced by residual space charges.
{"title":"Phenomenon of secondary reverse streamer in an ester transformer liquid under lightning impulse voltage","authors":"Q. Liu, Z. Wang","doi":"10.1109/CEIDP.2013.6748291","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748291","url":null,"abstract":"Secondary Reverse Streamer (SRS) was investigated in a natural ester transformer liquid under standard negative lightning impulse voltage. SRS represents a streamer that occurs well after the termination of the primary streamer (PS) propagation under a single lightning impulse, and it holds an opposite polarity to that of the PS and the impulse voltage. As an example when negative impulses are applied, all the SRSs have positive polarities. Although both streamers' stopping lengths increase with the applied voltage, the stopping length of SRS is always shorter than that of PS. The average propagation velocity of SRS is approximately 1.25 km/s regardless of applied voltages. The maximum light intensity of SRS is lower than that of PS. The formation of SRS is likely caused by the reserve electric filed induced by residual space charges.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125457378","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 : 2013-10-23DOI: 10.1109/CEIDP.2013.6748315
Q. Liu, Z. Liu, G. Yang
Streaming electrification phenomenon seen in power transformers results from forced oil circulation. This phenomenon has been extensively investigated since it was identified as one of the failure reasons for large power transformers. The majority of the published research focused on the streaming electrification of mineral oils. Taking into account the potential increase in the voltage level and capacity of ester liquid filled power transformers, the present study used a rotating disc system and compared the streaming electrification characteristics of a synthetic ester with those of a conventional mineral oil. The rotational speed was varied between 100 rpm and 1000 rpm, and the oil temperature was varied between 20 °C and 80 °C. Both aged and unaged oil samples were used to form the oil-pressboard interfaces. The measurement results indicate that the synthetic ester exhibits a stronger ability to generate streaming current than the mineral oil. The subsequent experiments show that the streaming current generated in the mineral oil increases as a result of ageing, whereas that in the synthetic ester decreases. The relaxation times of the two liquids have also been estimated. The results suggest that the mineral oil has a much larger relaxation time than the synthetic ester. For both types of oil, ageing results in decreases in their relaxation times.
{"title":"Comparison of streaming electrification characteristics between an ester liquid and a mineral oil using rotating disc method","authors":"Q. Liu, Z. Liu, G. Yang","doi":"10.1109/CEIDP.2013.6748315","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748315","url":null,"abstract":"Streaming electrification phenomenon seen in power transformers results from forced oil circulation. This phenomenon has been extensively investigated since it was identified as one of the failure reasons for large power transformers. The majority of the published research focused on the streaming electrification of mineral oils. Taking into account the potential increase in the voltage level and capacity of ester liquid filled power transformers, the present study used a rotating disc system and compared the streaming electrification characteristics of a synthetic ester with those of a conventional mineral oil. The rotational speed was varied between 100 rpm and 1000 rpm, and the oil temperature was varied between 20 °C and 80 °C. Both aged and unaged oil samples were used to form the oil-pressboard interfaces. The measurement results indicate that the synthetic ester exhibits a stronger ability to generate streaming current than the mineral oil. The subsequent experiments show that the streaming current generated in the mineral oil increases as a result of ageing, whereas that in the synthetic ester decreases. The relaxation times of the two liquids have also been estimated. The results suggest that the mineral oil has a much larger relaxation time than the synthetic ester. For both types of oil, ageing results in decreases in their relaxation times.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131374157","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 : 2013-10-20DOI: 10.1109/CEIDP.2013.6748151
H. Jin, T. Andritsch, P. Morshuis, J. Smit
A nanofluid is a two-phase mixture composed of a liquid phase and solid nanoparticles in suspension. These nanoparticles exhibit unique properties, compared to those of the same material at bulk scale. In this study, mineral oil based fullerene nanofluids with different concentrations were prepared. Of main interest was the AC breakdown voltage of the nanofluids. The AC breakdown voltage of the nanofluids was tested at around 24ppm humidity level. Since viscosity has such a large impart on properties of liquids, viscosity tests of fullerene nanofluids were performed with a rheology meter, in order to see if observed changes in the AC breakdown strength could be related to a change of viscosity.
{"title":"AC breakdown voltage and viscosity of mineral oil based fullerene nanofluids","authors":"H. Jin, T. Andritsch, P. Morshuis, J. Smit","doi":"10.1109/CEIDP.2013.6748151","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748151","url":null,"abstract":"A nanofluid is a two-phase mixture composed of a liquid phase and solid nanoparticles in suspension. These nanoparticles exhibit unique properties, compared to those of the same material at bulk scale. In this study, mineral oil based fullerene nanofluids with different concentrations were prepared. Of main interest was the AC breakdown voltage of the nanofluids. The AC breakdown voltage of the nanofluids was tested at around 24ppm humidity level. Since viscosity has such a large impart on properties of liquids, viscosity tests of fullerene nanofluids were performed with a rheology meter, in order to see if observed changes in the AC breakdown strength could be related to a change of viscosity.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"8 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116816126","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 : 2013-10-20DOI: 10.1109/CEIDP.2013.6748177
H. Jin, T. Andritsch, I. Tsekmes, R. Kochetov, P. Morshuis, J. Smit
The term “nanofluids” was first proposed by researchers at Argonne National Laboratory and refers to a two-phase mixture, composed of a liquid medium and solid nanoparticles in suspension. One method of enhancing the thermal conductivity of a fluid is to add nanoparticles to the fluid, thus creating such a nanofluid. In this study, fullerene and titania nanoparticles were dispersed into mineral oil in order to investigate the effect on the thermal conductivity of the host fluid. The thermal conductivity of nanofluids was measured by means of the hot-wire method. A model was devised to calculate the thermal conductivity in mineral oil based nanofluids and then calculated with the help of COMSOL Multiphysics and compared to measurement results.
{"title":"Thermal conductivity of fullerene and TiO2 nanofluids","authors":"H. Jin, T. Andritsch, I. Tsekmes, R. Kochetov, P. Morshuis, J. Smit","doi":"10.1109/CEIDP.2013.6748177","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748177","url":null,"abstract":"The term “nanofluids” was first proposed by researchers at Argonne National Laboratory and refers to a two-phase mixture, composed of a liquid medium and solid nanoparticles in suspension. One method of enhancing the thermal conductivity of a fluid is to add nanoparticles to the fluid, thus creating such a nanofluid. In this study, fullerene and titania nanoparticles were dispersed into mineral oil in order to investigate the effect on the thermal conductivity of the host fluid. The thermal conductivity of nanofluids was measured by means of the hot-wire method. A model was devised to calculate the thermal conductivity in mineral oil based nanofluids and then calculated with the help of COMSOL Multiphysics and compared to measurement results.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122660362","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 : 2013-10-20DOI: 10.1109/CEIDP.2013.6748266
M. S. A. Rahman, P. Rapisarda, P. Lewin
Ageing processes typically associated with the dielectric and insulation system occur inside high voltage plant. These unwanted processes may lead to generation of partial discharge (PD) activity and ultimately limit the operational life of the plant. The operational over stressing and defects introduced during manufacture also lead to the existence of PD activity and the source of this activity needs to be identified and remedied before further degradation processes cause catastrophic failure. Therefore, research into localization techniques of PD sources inside high voltage plant generally and particularly within transformer windings has become important in order to provide the asset health information that allows maintenance and replacement processes to be carried out effectively. Locating a PD source inside a transformer winding using on-line measurement data is vital in order to achieve these objectives. Methods have been proposed to achieve this and in this paper the distribution of PD signal energy in the time and frequency domains is used as a location tool. Analysis of experimental data reveals that this approach is independent of the applied voltage.
{"title":"The study of the effect in variation of A.C. applied voltage to the partial discharge localization inside transformer windings","authors":"M. S. A. Rahman, P. Rapisarda, P. Lewin","doi":"10.1109/CEIDP.2013.6748266","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748266","url":null,"abstract":"Ageing processes typically associated with the dielectric and insulation system occur inside high voltage plant. These unwanted processes may lead to generation of partial discharge (PD) activity and ultimately limit the operational life of the plant. The operational over stressing and defects introduced during manufacture also lead to the existence of PD activity and the source of this activity needs to be identified and remedied before further degradation processes cause catastrophic failure. Therefore, research into localization techniques of PD sources inside high voltage plant generally and particularly within transformer windings has become important in order to provide the asset health information that allows maintenance and replacement processes to be carried out effectively. Locating a PD source inside a transformer winding using on-line measurement data is vital in order to achieve these objectives. Methods have been proposed to achieve this and in this paper the distribution of PD signal energy in the time and frequency domains is used as a location tool. Analysis of experimental data reveals that this approach is independent of the applied voltage.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129685568","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 : 2013-10-20DOI: 10.1109/CEIDP.2013.6747074
A. Holt, M. Facciotti, P. Amaro, R. C. Brown, P. Lewin, J. Pilgrim, G. Wilson, P. Jarman
The impact of corrosive sulfur on high value assets such as transformers is widely reported and can be considered a global problem. A great deal of research and development is focused on the remediation of corrosive transformers and the mitigation of future corrosion. Regeneration of aged and or corrosive oil by filtration through bauxite clays is a common method for removal of polar molecules and many sulfurous compounds such as dibenzyl-disulfide (DBDS). This process is largely successful, although over the last several years, increased corrosion and even total failure of transformers has been linked with the reclamation process. In some cases, the corrosion associated with a recent reclamation is selective for silver rather than copper. By thoroughly understanding the chemistry occurring during aged oil reclamation, it will be possible to take appropriate measures to limit the formation of corrosive species during future reclamation and regeneration processes. There is a requirement to minimize the amount of oil wastage during reclamation for both environmental and commercial reasons. It is also important that any changes made to the reclamation process do not have a detrimental effect on the health and life-expectancy of the transformer. This paper describes studies carried out to track the total sulfur content of oil samples taken from two different locations (transformer main tank and reclamation rig buffer tank), at multiple time intervals during an oil reclamation procedure. By tracking the total sulfur content, it is possible to determine when and where maximum sulfur accumulation occurs, possibly indicating the best point at which a portion of oil should be disposed. Once a fuller understanding of the sulfur content is obtained, GC-MS will be used to gain a detailed understanding of the types of sulfurous species present in the oil.
{"title":"Silver corrosion in transformers","authors":"A. Holt, M. Facciotti, P. Amaro, R. C. Brown, P. Lewin, J. Pilgrim, G. Wilson, P. Jarman","doi":"10.1109/CEIDP.2013.6747074","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747074","url":null,"abstract":"The impact of corrosive sulfur on high value assets such as transformers is widely reported and can be considered a global problem. A great deal of research and development is focused on the remediation of corrosive transformers and the mitigation of future corrosion. Regeneration of aged and or corrosive oil by filtration through bauxite clays is a common method for removal of polar molecules and many sulfurous compounds such as dibenzyl-disulfide (DBDS). This process is largely successful, although over the last several years, increased corrosion and even total failure of transformers has been linked with the reclamation process. In some cases, the corrosion associated with a recent reclamation is selective for silver rather than copper. By thoroughly understanding the chemistry occurring during aged oil reclamation, it will be possible to take appropriate measures to limit the formation of corrosive species during future reclamation and regeneration processes. There is a requirement to minimize the amount of oil wastage during reclamation for both environmental and commercial reasons. It is also important that any changes made to the reclamation process do not have a detrimental effect on the health and life-expectancy of the transformer. This paper describes studies carried out to track the total sulfur content of oil samples taken from two different locations (transformer main tank and reclamation rig buffer tank), at multiple time intervals during an oil reclamation procedure. By tracking the total sulfur content, it is possible to determine when and where maximum sulfur accumulation occurs, possibly indicating the best point at which a portion of oil should be disposed. Once a fuller understanding of the sulfur content is obtained, GC-MS will be used to gain a detailed understanding of the types of sulfurous species present in the oil.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122685544","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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