Pub Date : 2013-10-08DOI: 10.1109/ICSD.2013.6619708
S. Bouchareb, V. Griseri, L. Berquez
Material used in space aircraft are in contact with a large panel of charged particles. Dielectrics can store charges up to a certain extend above which electrostatic discharges might occur. To prevent these phenomena that can be harmful for the embarked electronic devices, the electrical behavior of those materials under irradiation must be studied. In the present case, we are only interested in the effect of electrons on dielectrics materials properties. To do so, an irradiation chamber has been equipped with various characterization tools to perform measurements in-situ. This work is focused on in situ space charge measurements by Pulse Electro Acoustic (PEA) technique and Laser Intensity Modulated Method (LIMM) during and post-irradiation. Experimental space charge distributions obtained by both techniques will be presented and discussed taking into account the measurement arrangements.
{"title":"In situ space charge profile measurements on electronic irradiated material by LIMM","authors":"S. Bouchareb, V. Griseri, L. Berquez","doi":"10.1109/ICSD.2013.6619708","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619708","url":null,"abstract":"Material used in space aircraft are in contact with a large panel of charged particles. Dielectrics can store charges up to a certain extend above which electrostatic discharges might occur. To prevent these phenomena that can be harmful for the embarked electronic devices, the electrical behavior of those materials under irradiation must be studied. In the present case, we are only interested in the effect of electrons on dielectrics materials properties. To do so, an irradiation chamber has been equipped with various characterization tools to perform measurements in-situ. This work is focused on in situ space charge measurements by Pulse Electro Acoustic (PEA) technique and Laser Intensity Modulated Method (LIMM) during and post-irradiation. Experimental space charge distributions obtained by both techniques will be presented and discussed taking into account the measurement arrangements.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124581720","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619800
Yan Wang, George Chen, A. Vaughan
Space charge formation is a well known phenomenon that affects the overall dielectric properties of insulation systems. Space charge occurs when the rate of charge accumulation is different from the rate of removal and involves moving and trapped charges, which modify the electric field distribution within the material. As a result of this, the internal field within the dielectric is locally increased, which then leads to faster degradation and premature failure. Several techniques have been used to probe the space charge behavior of novel dielectric materials, especially in connection with the emerging topic of polymer nanocomposites - material systems that exhibit unique insulation characteristics due to the presence of nanometer-sized inclusions. In this paper, we report on an investigation into space charge dynamics in silica-based polyethylene nanocomposites, where the nanofiller has been modified with respect to its surface chemistry. For this, the pulsed electro-acoustic technique has been used. Experimental observations indicate that the incorporation of nanosilica into polyethylene results in homocharge development near both electrodes. However, with appropriate surface treatment of the filler, homocharges formation was successfully suppressed. Possible relationships between the space charge development and dielectric breakdown properties of the nanocomposites are discussed.
{"title":"Space charge dynamics in silica-based polyethylene nanocomposites","authors":"Yan Wang, George Chen, A. Vaughan","doi":"10.1109/ICSD.2013.6619800","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619800","url":null,"abstract":"Space charge formation is a well known phenomenon that affects the overall dielectric properties of insulation systems. Space charge occurs when the rate of charge accumulation is different from the rate of removal and involves moving and trapped charges, which modify the electric field distribution within the material. As a result of this, the internal field within the dielectric is locally increased, which then leads to faster degradation and premature failure. Several techniques have been used to probe the space charge behavior of novel dielectric materials, especially in connection with the emerging topic of polymer nanocomposites - material systems that exhibit unique insulation characteristics due to the presence of nanometer-sized inclusions. In this paper, we report on an investigation into space charge dynamics in silica-based polyethylene nanocomposites, where the nanofiller has been modified with respect to its surface chemistry. For this, the pulsed electro-acoustic technique has been used. Experimental observations indicate that the incorporation of nanosilica into polyethylene results in homocharge development near both electrodes. However, with appropriate surface treatment of the filler, homocharges formation was successfully suppressed. Possible relationships between the space charge development and dielectric breakdown properties of the nanocomposites are discussed.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131331410","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619907
B. Du, Jie Li, W. Du, H. Du, Yu Gao, Lin Yang
Polyimide film, as a special type of engineering plastic film, is a kind of basic insulating material and is widely applied in the aerial, nuclear, microelectronic industry, turn to turn insulation and turn to ground insulation of inverter-fed motors. However, with the disadvantage of organic polymer, its corona-resistance property is not good enough, which makes insulation early failures occur frequently. The existence of surface charge has a great effect on breakdown characteristic and is the main reason leading to dielectric breakdown. Fluorination as change the chemical component in surface layer of polymers should give rise to the corresponding change in electrical properties of the surface layer thus influence the charge injection from electrodes when they are used as an insulator. This paper presents a study aimed at clarifying the effect of fluorination time on surface charge accumulation and decay behaviors of fluorinated polyimide film. Samples were surface fluorinated in a laboratory vessel at about 328K (55 °C) using a F2/N2 mixture with 20% F2 by volume and 0.05 MPa (500 mbar) for respectively 15, 30, 45 and 60 minutes. Corona charging tests were performed at room temperature with a relative humidity of ~ 40%. The charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the charge density as well as the charge decay rate upon the fluorination time of samples, varying as a function of the charge polarity and charging time.
{"title":"Dynamic behavior of surface charge on direct-fluorinated polyimide films","authors":"B. Du, Jie Li, W. Du, H. Du, Yu Gao, Lin Yang","doi":"10.1109/ICSD.2013.6619907","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619907","url":null,"abstract":"Polyimide film, as a special type of engineering plastic film, is a kind of basic insulating material and is widely applied in the aerial, nuclear, microelectronic industry, turn to turn insulation and turn to ground insulation of inverter-fed motors. However, with the disadvantage of organic polymer, its corona-resistance property is not good enough, which makes insulation early failures occur frequently. The existence of surface charge has a great effect on breakdown characteristic and is the main reason leading to dielectric breakdown. Fluorination as change the chemical component in surface layer of polymers should give rise to the corresponding change in electrical properties of the surface layer thus influence the charge injection from electrodes when they are used as an insulator. This paper presents a study aimed at clarifying the effect of fluorination time on surface charge accumulation and decay behaviors of fluorinated polyimide film. Samples were surface fluorinated in a laboratory vessel at about 328K (55 °C) using a F2/N2 mixture with 20% F2 by volume and 0.05 MPa (500 mbar) for respectively 15, 30, 45 and 60 minutes. Corona charging tests were performed at room temperature with a relative humidity of ~ 40%. The charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the charge density as well as the charge decay rate upon the fluorination time of samples, varying as a function of the charge polarity and charging time.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130154824","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619746
J. Martin, D. Budina, J. Zakel, M. Schafer, K. Weitzel
The transport of potassium and rubidium ions through glasses containing the respective alkali ion as mobile species has been investigated by means of bombardment induced ion transport (BIIT) and impedance spectroscopy (IS). The conductivities as well as the activation energies derived from the two approaches are in agreement lending further support to the recently developed BIIT approach.
{"title":"Ionic conductivities of calcium-phosphate glasses","authors":"J. Martin, D. Budina, J. Zakel, M. Schafer, K. Weitzel","doi":"10.1109/ICSD.2013.6619746","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619746","url":null,"abstract":"The transport of potassium and rubidium ions through glasses containing the respective alkali ion as mobile species has been investigated by means of bombardment induced ion transport (BIIT) and impedance spectroscopy (IS). The conductivities as well as the activation energies derived from the two approaches are in agreement lending further support to the recently developed BIIT approach.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116438371","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619828
G. Meng, Yonghong Cheng, Liang Chen, Yu Chen, Kai Wu
Micro-electro-mechanical systems (MEMS) and Nano-electro-mechanical systems (NEMS) are emerging technologies that uses tools and techniques in the microelectronics industry to build microscopic machines. Electrostatic force is often employed to drive the motion components in MEMS and NEMS devices, which could cause extremely high electric field (more than 108 V/m) between two metal conductors. However, the high field intensity may result in electrical breakdown across the conductors in case of improper operations or overvoltage. Therefore, this paper presented a novel experimental technique to study the discharge behaviors across nanometer gaps between 20 nm and 300 nm. The influence of gap separations on breakdown characteristics and the voltage contrast effect in the gap spacing were both investigated. Results showed that the field electron emission did not play a dominate role in the electrical breakdown process across nanometer gaps, which was different from the classical theory of vacuum breakdown, and the breakdown voltage increased as the increase of gap separations. Besides, the voltage contrast effect in the gap spacing was also observed through the scanning electron microscope, which was related to the electric field intensity.
{"title":"Discharge behaviors of electrical breakdown across nanometer vacuum gaps","authors":"G. Meng, Yonghong Cheng, Liang Chen, Yu Chen, Kai Wu","doi":"10.1109/ICSD.2013.6619828","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619828","url":null,"abstract":"Micro-electro-mechanical systems (MEMS) and Nano-electro-mechanical systems (NEMS) are emerging technologies that uses tools and techniques in the microelectronics industry to build microscopic machines. Electrostatic force is often employed to drive the motion components in MEMS and NEMS devices, which could cause extremely high electric field (more than 108 V/m) between two metal conductors. However, the high field intensity may result in electrical breakdown across the conductors in case of improper operations or overvoltage. Therefore, this paper presented a novel experimental technique to study the discharge behaviors across nanometer gaps between 20 nm and 300 nm. The influence of gap separations on breakdown characteristics and the voltage contrast effect in the gap spacing were both investigated. Results showed that the field electron emission did not play a dominate role in the electrical breakdown process across nanometer gaps, which was different from the classical theory of vacuum breakdown, and the breakdown voltage increased as the increase of gap separations. Besides, the voltage contrast effect in the gap spacing was also observed through the scanning electron microscope, which was related to the electric field intensity.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127930052","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619730
Shiling Zhang, Zongren Peng, Liu Peng, X. Ning
Entire performance of UHVDC resin impregnated paper (RIP) bushings in operation condition has an intimate connection with electrical and thermal properties of epoxy/crepe paper composites used in bushing condenser. Firstly, some samples of pure epoxy and epoxy/crepe composites which are identical to those used in actual RIP bushings were fabricated. Then micro morphology of these samples has been observed by scanning electron microscopy (SEM) and polarized light microscopy (PLM). Some electrical performance measurements were carried out including AC breakdown characteristics, bulk resistivity versus temperature characteristics and dielectric spectroscopy with broadband dielectric spectra. Meanwhile, thermal property containing thermal conductivity versus temperature characteristic has also been obtained experimentally. Finally, with these parameters of composites, electric field and temperature distribution inside bushing condenser has also been simulated by finite element method (FEM).
{"title":"Experimental study on the electrical and thermal properties of epoxy-crepe paper composites for use in UHV DC bushing condensers","authors":"Shiling Zhang, Zongren Peng, Liu Peng, X. Ning","doi":"10.1109/ICSD.2013.6619730","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619730","url":null,"abstract":"Entire performance of UHVDC resin impregnated paper (RIP) bushings in operation condition has an intimate connection with electrical and thermal properties of epoxy/crepe paper composites used in bushing condenser. Firstly, some samples of pure epoxy and epoxy/crepe composites which are identical to those used in actual RIP bushings were fabricated. Then micro morphology of these samples has been observed by scanning electron microscopy (SEM) and polarized light microscopy (PLM). Some electrical performance measurements were carried out including AC breakdown characteristics, bulk resistivity versus temperature characteristics and dielectric spectroscopy with broadband dielectric spectra. Meanwhile, thermal property containing thermal conductivity versus temperature characteristic has also been obtained experimentally. Finally, with these parameters of composites, electric field and temperature distribution inside bushing condenser has also been simulated by finite element method (FEM).","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121573405","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619733
Congzhen Xie, Shan Liu, H. Niu, Licheng Li
The sheath and the shed in China are made of high temperature vulcanized (HTV) silicone rubber. The ferric oxide powder is widely used as red colorant, and it cannot disperse uniformly in the rubber for the reason that the ferric oxide powder is inorganic. In the paper, adding way and the amount of the ferric oxide powder are changed in the specimen-making process. Through hot air aging test, the changes of the specimen's electrical performances, mechanical properties and microstructure are considered, so the influence of the colorant on the specimen's property under hot air environment has been discussed. The results show that color masterbatch which is made of ferric oxide in advance, added in the rubber mixing process can improve the dispersion of the ferric oxide in the rubber, so that the ferric oxide can help reduce degradation of performance due to thermal-oxidative-aging. The radicals which are produced in silicone rubber's aging process could be trapped by the iron ions, which can be oxidated by oxygen in the air soon, and the amount of iron ions are not changed before and after the reaction. Therefore, increasing the content of iron oxide has no significant effect to improve the heat aging performance of the silicone rubber.
{"title":"The impact of the colorants on the aging properties of HTV silicone rubber","authors":"Congzhen Xie, Shan Liu, H. Niu, Licheng Li","doi":"10.1109/ICSD.2013.6619733","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619733","url":null,"abstract":"The sheath and the shed in China are made of high temperature vulcanized (HTV) silicone rubber. The ferric oxide powder is widely used as red colorant, and it cannot disperse uniformly in the rubber for the reason that the ferric oxide powder is inorganic. In the paper, adding way and the amount of the ferric oxide powder are changed in the specimen-making process. Through hot air aging test, the changes of the specimen's electrical performances, mechanical properties and microstructure are considered, so the influence of the colorant on the specimen's property under hot air environment has been discussed. The results show that color masterbatch which is made of ferric oxide in advance, added in the rubber mixing process can improve the dispersion of the ferric oxide in the rubber, so that the ferric oxide can help reduce degradation of performance due to thermal-oxidative-aging. The radicals which are produced in silicone rubber's aging process could be trapped by the iron ions, which can be oxidated by oxygen in the air soon, and the amount of iron ions are not changed before and after the reaction. Therefore, increasing the content of iron oxide has no significant effect to improve the heat aging performance of the silicone rubber.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132681486","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619662
Guochang Li, Shengtao Li, D. Min, N. Zhao, Yuanwei Zhu
In extra high voltage transmission systems, the accumulation of space charges in polymeric materials have an important influence on the aging and breakdown of power equipments. It has been reported that space charges are mainly determined by trap distribution. Therefore, it is important to understand the influence of trap depths on space charges accumulation in insulating material. In this paper, based on charge migration, trapping and detrapping processes, an unipolar charge transport model has been adopted. The influence of trap depths on space charge in low density polyethylene can be obtained through solving the charge continuity equation, Poisson equation and first order charge trapping/ detrapping dynamic equation. The calculation results show that the free electron density and trapped electron density decrease gradually with the increase of sample position. With the trap depth increases, the total number of trapped electrons also increases, but the total number of free electrons decreases gradually. When the trap depth is larger than 1.1 eV, the total number of space charges in material keeps an equilibrium value. This research provides a theoretical guidance for diagnosing aging degree of insulating equipments in the future.
{"title":"Influence of trap depths on space charge formation and accumulation characteristics in low density polyethylene","authors":"Guochang Li, Shengtao Li, D. Min, N. Zhao, Yuanwei Zhu","doi":"10.1109/ICSD.2013.6619662","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619662","url":null,"abstract":"In extra high voltage transmission systems, the accumulation of space charges in polymeric materials have an important influence on the aging and breakdown of power equipments. It has been reported that space charges are mainly determined by trap distribution. Therefore, it is important to understand the influence of trap depths on space charges accumulation in insulating material. In this paper, based on charge migration, trapping and detrapping processes, an unipolar charge transport model has been adopted. The influence of trap depths on space charge in low density polyethylene can be obtained through solving the charge continuity equation, Poisson equation and first order charge trapping/ detrapping dynamic equation. The calculation results show that the free electron density and trapped electron density decrease gradually with the increase of sample position. With the trap depth increases, the total number of trapped electrons also increases, but the total number of free electrons decreases gradually. When the trap depth is larger than 1.1 eV, the total number of space charges in material keeps an equilibrium value. This research provides a theoretical guidance for diagnosing aging degree of insulating equipments in the future.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"52 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132287334","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 : 2013-10-08DOI: 10.1109/ICSD.2013.6619748
D. van der Born, I. Tsekmes, P. Morshuis, J. J. Smit, T. J. Person, S. J. Sutton
Polymeric insulation materials have not been used in HVDC cable systems until recently because of the tendency of polymers to deplete accumulated charges very slowly. Research on space charge injection, conduction and trapping mechanisms can reveal information about which materials are the best candidates for HVDC cable insulation. In this paper, space charge de-trapping and extraction processes are evaluated in polymeric mini-cables consisting of several different XLPE based insulation materials and PE based semi-conductive layers. The main difference between the materials can be found in the type and concentration of additives. De-trapping and extraction of accumulated space charge in the insulation is investigated with the help of depolarization measurements, which are performed with the Pulsed Electro-Acoustic (PEA) method for cable geometry objects.
{"title":"Evaluation of apparent trap-controlled mobility and trap depth in polymeric HVDC mini-cables","authors":"D. van der Born, I. Tsekmes, P. Morshuis, J. J. Smit, T. J. Person, S. J. Sutton","doi":"10.1109/ICSD.2013.6619748","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619748","url":null,"abstract":"Polymeric insulation materials have not been used in HVDC cable systems until recently because of the tendency of polymers to deplete accumulated charges very slowly. Research on space charge injection, conduction and trapping mechanisms can reveal information about which materials are the best candidates for HVDC cable insulation. In this paper, space charge de-trapping and extraction processes are evaluated in polymeric mini-cables consisting of several different XLPE based insulation materials and PE based semi-conductive layers. The main difference between the materials can be found in the type and concentration of additives. De-trapping and extraction of accumulated space charge in the insulation is investigated with the help of depolarization measurements, which are performed with the Pulsed Electro-Acoustic (PEA) method for cable geometry objects.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130471723","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}
In power transformers, the main reason why insulation faults occur is that partial discharge (PD) produces insulation deterioration at the weakest point of the insulation structure and ultimately lead to insulation breakdown. The insulation defects exist in the form of electrical trees or carbon channels reduce the effective insulating distance. Take the opaqueness of pressboard into consideration, the carbon channels generated by PD can't be easily observed. Therefore, in this paper, tests based on inter-turn partial discharge model are conducted to study the development rules of oil-paper insulation material defects. Constant voltage application was adopted in this series of tests. High voltage of 40 kV is applied on the inter-turn electrode specimens for different time in different groups of tests. After test, insulation tapes are stripped from inter-turn electrodes layer by layer so as to observe the carbon channels clearly. Results indicate that the development process of the carbon channel can be roughly divided into three stages. Analysis of discharge feature reveals two different shapes of q-φ scatter diagrams, the shape of seeds and the shape of inverted tacks. The shape shown in scatter diagram could be used as effective criteria to diagnose the inter-turn insulation defects produced by partial discharge at later stage.
{"title":"Development rules of inter-turn partial discharge defects on oil-paper insulation","authors":"Jinqing Wei, Yangchun Cheng, Guangzhen Wang, Zhihai Rong, Changjin Diao, Xiao Tian","doi":"10.1109/ICSD.2013.6619715","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619715","url":null,"abstract":"In power transformers, the main reason why insulation faults occur is that partial discharge (PD) produces insulation deterioration at the weakest point of the insulation structure and ultimately lead to insulation breakdown. The insulation defects exist in the form of electrical trees or carbon channels reduce the effective insulating distance. Take the opaqueness of pressboard into consideration, the carbon channels generated by PD can't be easily observed. Therefore, in this paper, tests based on inter-turn partial discharge model are conducted to study the development rules of oil-paper insulation material defects. Constant voltage application was adopted in this series of tests. High voltage of 40 kV is applied on the inter-turn electrode specimens for different time in different groups of tests. After test, insulation tapes are stripped from inter-turn electrodes layer by layer so as to observe the carbon channels clearly. Results indicate that the development process of the carbon channel can be roughly divided into three stages. Analysis of discharge feature reveals two different shapes of q-φ scatter diagrams, the shape of seeds and the shape of inverted tacks. The shape shown in scatter diagram could be used as effective criteria to diagnose the inter-turn insulation defects produced by partial discharge at later stage.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132047860","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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