Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.312065
P. M. Mitchinson, P. Lewin, I. Hosier, G. Chen, P. Jarman
High voltage equipment (e.g. transformers and switchgear), use mineral oil and paper as a cost effective and well tried insulation medium. However, this insulation is known to age over time and usage. An obvious sign of ageing is the change in the colour of the oil which changes from pale yellow to reddish brown. This colour change can be measured by the technique of ultraviolet/visual (UV/Vis) spectroscopy. Other techniques such as acid number measurement and infrared (IR) spectroscopy can also be used as indicators of the age of the oil. In general, decisions can be taken by the operator, depending upon the results of these and other tests, as to when and how to maintain the equipment. Maintenance solutions include refurbishment of the transformer or the replacement of the mineral oil. However, these treatments are expensive and a more cost effective option is to use either oil purification or reclamation in order to cleanse the system before refurbishment becomes necessary. The question then becomes: which of these two processes is the more effective? There is little up-to-date research published on the effects of fuller's earth on transformer oil. This paper considers an experiment where aged oil is processed using fuller's earth and contrasts the results of selected ageing indicators against the known results of the oil purification process.
{"title":"Oil reclamation - just a question of moisture?","authors":"P. M. Mitchinson, P. Lewin, I. Hosier, G. Chen, P. Jarman","doi":"10.1109/CEIDP.2006.312065","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312065","url":null,"abstract":"High voltage equipment (e.g. transformers and switchgear), use mineral oil and paper as a cost effective and well tried insulation medium. However, this insulation is known to age over time and usage. An obvious sign of ageing is the change in the colour of the oil which changes from pale yellow to reddish brown. This colour change can be measured by the technique of ultraviolet/visual (UV/Vis) spectroscopy. Other techniques such as acid number measurement and infrared (IR) spectroscopy can also be used as indicators of the age of the oil. In general, decisions can be taken by the operator, depending upon the results of these and other tests, as to when and how to maintain the equipment. Maintenance solutions include refurbishment of the transformer or the replacement of the mineral oil. However, these treatments are expensive and a more cost effective option is to use either oil purification or reclamation in order to cleanse the system before refurbishment becomes necessary. The question then becomes: which of these two processes is the more effective? There is little up-to-date research published on the effects of fuller's earth on transformer oil. This paper considers an experiment where aged oil is processed using fuller's earth and contrasts the results of selected ageing indicators against the known results of the oil purification process.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117142447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.311928
T. Tanaka
Some of the major dielectric phenomena observed in polymer nanocomposites are explained in terms of a multi-core model proposed by the author. They include characteristics associated with low field conductivity, high field conduction, permittivity, loss tan delta, the threshold field for space charge formation and EL inception, the increase in PD endurance and in treeing lifetime, and even a newly found crossover phenomenon. This model is characterized by individual and collective roles of multi-cores. The latter is related to carrier injection and tree growth at high electric field.
{"title":"Interpretation of Several Key Phenomena Peculiar to Nano Dielectrics in terms of a Multi-core Model","authors":"T. Tanaka","doi":"10.1109/CEIDP.2006.311928","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311928","url":null,"abstract":"Some of the major dielectric phenomena observed in polymer nanocomposites are explained in terms of a multi-core model proposed by the author. They include characteristics associated with low field conductivity, high field conduction, permittivity, loss tan delta, the threshold field for space charge formation and EL inception, the increase in PD endurance and in treeing lifetime, and even a newly found crossover phenomenon. This model is characterized by individual and collective roles of multi-cores. The latter is related to carrier injection and tree growth at high electric field.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115462915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.311937
M. Frechette, C. Reed
In recent years, much effort has been devoted to the effects associated with the presence of nanostructures in bulk materials. Since the introduction of the concept of "Nanodielectrics", various research activities concurred to confirm that these new materials form a special class of composites showing potential. In this contribution, the authors share their thoughts about the concept that nanodielectrics are shaped and controlled at the molecular level. Some elementary principles will be introduced and discussed.
{"title":"On molecular dielectrics in their role in shaping and controlling nanodielectrics","authors":"M. Frechette, C. Reed","doi":"10.1109/CEIDP.2006.311937","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311937","url":null,"abstract":"In recent years, much effort has been devoted to the effects associated with the presence of nanostructures in bulk materials. Since the introduction of the concept of \"Nanodielectrics\", various research activities concurred to confirm that these new materials form a special class of composites showing potential. In this contribution, the authors share their thoughts about the concept that nanodielectrics are shaped and controlled at the molecular level. Some elementary principles will be introduced and discussed.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128368214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.312089
K. Aoyagi, Y. Kitahara, R. Ohyama
Flow velocity measurement of an ionic wind field with DC corona discharges in a needle-plate electrode system is experimentally investigated. A laser-induced phosphorescence phenomenon of vapor-phase biacetyl tracer is applied to identify the ionic wind velocity. The phosphorescence phenomenon is used as a molecular tagging approach for gas-phase flow visualization because a lifetime of the phosphorescence emission is much longer than the fluorescence emission. The visualization image shows a time-depended phosphorescence emission pattern blown away by the ionic wind. An image analysis for the luminescence pattern, which is captured with an elapsing time from the pulsed laser excitation, is enabled us to quantitatively characterize the ionic wind velocity. This paper presents the experimentally obtained visualization images of ionic wind movements, and describes the velocity identification on the phosphorescence image analysis.
{"title":"Optical Characterization of Ionic Wind Field by Means of Laser-Induced Phosphorescence","authors":"K. Aoyagi, Y. Kitahara, R. Ohyama","doi":"10.1109/CEIDP.2006.312089","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312089","url":null,"abstract":"Flow velocity measurement of an ionic wind field with DC corona discharges in a needle-plate electrode system is experimentally investigated. A laser-induced phosphorescence phenomenon of vapor-phase biacetyl tracer is applied to identify the ionic wind velocity. The phosphorescence phenomenon is used as a molecular tagging approach for gas-phase flow visualization because a lifetime of the phosphorescence emission is much longer than the fluorescence emission. The visualization image shows a time-depended phosphorescence emission pattern blown away by the ionic wind. An image analysis for the luminescence pattern, which is captured with an elapsing time from the pulsed laser excitation, is enabled us to quantitatively characterize the ionic wind velocity. This paper presents the experimentally obtained visualization images of ionic wind movements, and describes the velocity identification on the phosphorescence image analysis.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129995402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.311926
C. Petrarca, G. Lupò, B. de Vivo, L. Egiziano, V. Tucci
Pulsewidth modulated (PWM) inverters are one of the major causes of motor bearing failure in inverter-motor drive systems. The new switching devices, such as the IGBT's, characterized by high switching frequencies and faster switching times, on one side have increased the efficiency, performance and controllability of adjustable speed drives but, on the other side, have brought some relevant drawbacks. In fact, the output voltage from the inverter is not purely sinusoidal and, in particular, steep front pulses can be generated in correspondence to the commutations of switching devices. The presence of high frequency harmonics causes an uneven voltage distribution along motor windings, producing critical stresses on the motor electrical insulation; furthermore the steep pulses can excite the capacitive coupling between the stator and the rotor, resulting in shaft voltages. The latter may cause the breakdown of the lubricating film in the bearings, and the associated electric discharge machining (EDM) currents can damage the bearing and reduce its lifetime. For design purposes it seems of major importance to predict the electrical stresses on the lubricating film of rolling bearings. The present paper is dedicated to the presentation of results of numerical simulations carried out on a traction motor obtained by implementing a Multiconductor Transmission Line (MTL) model of the overall system composed of the power voltage, the feeding cable, the motor stator winding, the rotor shaft and the bearings. The influence on the shaft voltages of parameters like the amplitude and slew rate (dV/dt) of the applied voltage, the cable length, is discussed.
{"title":"Numerical characterization of electrical stresses on dielectric grease of rolling bearings in induction motors fed by PWM inverters","authors":"C. Petrarca, G. Lupò, B. de Vivo, L. Egiziano, V. Tucci","doi":"10.1109/CEIDP.2006.311926","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311926","url":null,"abstract":"Pulsewidth modulated (PWM) inverters are one of the major causes of motor bearing failure in inverter-motor drive systems. The new switching devices, such as the IGBT's, characterized by high switching frequencies and faster switching times, on one side have increased the efficiency, performance and controllability of adjustable speed drives but, on the other side, have brought some relevant drawbacks. In fact, the output voltage from the inverter is not purely sinusoidal and, in particular, steep front pulses can be generated in correspondence to the commutations of switching devices. The presence of high frequency harmonics causes an uneven voltage distribution along motor windings, producing critical stresses on the motor electrical insulation; furthermore the steep pulses can excite the capacitive coupling between the stator and the rotor, resulting in shaft voltages. The latter may cause the breakdown of the lubricating film in the bearings, and the associated electric discharge machining (EDM) currents can damage the bearing and reduce its lifetime. For design purposes it seems of major importance to predict the electrical stresses on the lubricating film of rolling bearings. The present paper is dedicated to the presentation of results of numerical simulations carried out on a traction motor obtained by implementing a Multiconductor Transmission Line (MTL) model of the overall system composed of the power voltage, the feeding cable, the motor stator winding, the rotor shaft and the bearings. The influence on the shaft voltages of parameters like the amplitude and slew rate (dV/dt) of the applied voltage, the cable length, is discussed.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124843511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.312059
V. Dubickas, H. Edin
In this paper an on-line time domain reflectometry system and a four-days measurements sequence are presented. Detected pulse velocity variations are attributed to temperature variations of the cable caused by a load cycling. The changes in the pulse velocity are verified by propagation constant measurements of a power cable at different temperatures in 300 kHz-500 MHz frequency range. Also an influence of temperature dependent semiconducting screens and XLPE insulation to the changes in the cable's capacitance is investigated.
{"title":"On-line time domain reflectometry measurements of temperature variations of an XLPE power cable","authors":"V. Dubickas, H. Edin","doi":"10.1109/CEIDP.2006.312059","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312059","url":null,"abstract":"In this paper an on-line time domain reflectometry system and a four-days measurements sequence are presented. Detected pulse velocity variations are attributed to temperature variations of the cable caused by a load cycling. The changes in the pulse velocity are verified by propagation constant measurements of a power cable at different temperatures in 300 kHz-500 MHz frequency range. Also an influence of temperature dependent semiconducting screens and XLPE insulation to the changes in the cable's capacitance is investigated.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114054607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.312019
I. Sauers, D. James, E. Tuncer, A. Ellis, M. Pace
A prototype 5-m triaxial high temperature superconducting (HTS) distribution class cable using a cold dielectric design was tested at high voltage under various conditions including AC, impulse and partial discharge (PD). The dielectric consists of wrapped synthetic tape insulation with liquid nitrogen filling the butt-gaps. In this paper we report on the partial discharge signals in the cable and methods for data analysis. All measurements were made cold in liquid nitrogen. The data will be presented in terms of PD amplitude and energy. Partial discharge signals were observed in the presence of large amounts of background noise due to the inverter circuits of the cryogenic system and these issues will also be discussed.
{"title":"Partial discharge measurements in a high temperature superconducting triaxial 5-m model cable at liquid nitrogen temperature","authors":"I. Sauers, D. James, E. Tuncer, A. Ellis, M. Pace","doi":"10.1109/CEIDP.2006.312019","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312019","url":null,"abstract":"A prototype 5-m triaxial high temperature superconducting (HTS) distribution class cable using a cold dielectric design was tested at high voltage under various conditions including AC, impulse and partial discharge (PD). The dielectric consists of wrapped synthetic tape insulation with liquid nitrogen filling the butt-gaps. In this paper we report on the partial discharge signals in the cable and methods for data analysis. All measurements were made cold in liquid nitrogen. The data will be presented in terms of PD amplitude and energy. Partial discharge signals were observed in the presence of large amounts of background noise due to the inverter circuits of the cryogenic system and these issues will also be discussed.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126451286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.312091
B. Komeili, J. Chang, G. Harvel
The electrohydrodynamic (EHD) flow characteristics for a wire to rod type EHD gas pump have been experimentally investigated. Experiments were conducted for DC negative and positive applied high voltage to a corona wire of diameter 0.24 mm from 0-24 kV, grounding rod electrode diameter from 1.5 mm to 3.1 mm and wire/rod electrode distance to pipe diameter ratio from 0.63 to 1.16. It was observed that the polarity plays an important role, where a negative high voltage generates a higher gas flow than that of a positive polarity. The results show that a maximum of 40 L/min of gas flow rate is generated at 0.37 W energy input when the pipe diameter is 20 mm with the corona wire electrode and grounding rod electrode gap distant set to 12.6 mm under negative applied voltage compared to 25 L/min at 0.23 W energy input for the positive case at the same specific energy density.
{"title":"Polarity Effect and Flow Characteristics of Wire-Rod Type Electrohydrodynamic Gas Pump","authors":"B. Komeili, J. Chang, G. Harvel","doi":"10.1109/CEIDP.2006.312091","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312091","url":null,"abstract":"The electrohydrodynamic (EHD) flow characteristics for a wire to rod type EHD gas pump have been experimentally investigated. Experiments were conducted for DC negative and positive applied high voltage to a corona wire of diameter 0.24 mm from 0-24 kV, grounding rod electrode diameter from 1.5 mm to 3.1 mm and wire/rod electrode distance to pipe diameter ratio from 0.63 to 1.16. It was observed that the polarity plays an important role, where a negative high voltage generates a higher gas flow than that of a positive polarity. The results show that a maximum of 40 L/min of gas flow rate is generated at 0.37 W energy input when the pipe diameter is 20 mm with the corona wire electrode and grounding rod electrode gap distant set to 12.6 mm under negative applied voltage compared to 25 L/min at 0.23 W energy input for the positive case at the same specific energy density.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131244316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.312113
M.A. Brown, S. Dodd, B. Ahern, J. Pettinger, F. Waite
The use of appropriate condition assessment criteria for the continued service of synthetic resin bonded paper (SRBP) based insulation is necessary for the continued operation or lifetime extension of SRBP based HV plant. Here, we report on work undertaken to investigate quantitatively the relationship between partial discharge activity occurring within the SRBP core with the production/absorption of decomposition gas in the surrounding oil. The emphasis of the results was to look at gases typically observed in transformers and associated bushings and their rate of production. Gas production rates considered here include H2, CO, CH4, C2H2, C2H4, and C2H6. Constant stress ac tests were conducted on pin-plane geometry SRBP samples, which were immersed in transformer oil. During each test, the partial discharge activity over the duration of the tests was monitored and complemented by periodic sampling of the surrounding oil for dissolved gas analysis (DGA). Prior to the experiments, the SRBP samples were conditioned to produce varying amounts of absorbed oil and moisture absorption. The results of DGA on the oil, including the variation of gas evolution as a function of partial discharge activity, and chemical status (i.e. amount of oil/moisture) are discussed.
{"title":"Correlation of partial discharge and dissolved gas analysis results from discharge activity in SRBP","authors":"M.A. Brown, S. Dodd, B. Ahern, J. Pettinger, F. Waite","doi":"10.1109/CEIDP.2006.312113","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312113","url":null,"abstract":"The use of appropriate condition assessment criteria for the continued service of synthetic resin bonded paper (SRBP) based insulation is necessary for the continued operation or lifetime extension of SRBP based HV plant. Here, we report on work undertaken to investigate quantitatively the relationship between partial discharge activity occurring within the SRBP core with the production/absorption of decomposition gas in the surrounding oil. The emphasis of the results was to look at gases typically observed in transformers and associated bushings and their rate of production. Gas production rates considered here include H2, CO, CH4, C2H2, C2H4, and C2H6. Constant stress ac tests were conducted on pin-plane geometry SRBP samples, which were immersed in transformer oil. During each test, the partial discharge activity over the duration of the tests was monitored and complemented by periodic sampling of the surrounding oil for dissolved gas analysis (DGA). Prior to the experiments, the SRBP samples were conditioned to produce varying amounts of absorbed oil and moisture absorption. The results of DGA on the oil, including the variation of gas evolution as a function of partial discharge activity, and chemical status (i.e. amount of oil/moisture) are discussed.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133955630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.311941
G. Zhao, R. Joshi, V. Lakdawala, E. Schamiloglu, H. Hjalmarson
Model studies of current conduction and breakdown in TiO2 were carried out. Our simulation results indicate that electrical breakdown of TiO2 under multiple pulsed conditions can occur at lower voltages as compared to quasi-DC biasing. This is in agreement with experimental data. The results are indicative of a cumulative effect. We hypothesize that the lower breakdown voltages observed in TiO2 under pulsed conditions, is a direct rise-time effect, coupled with cummulative detrapping.
{"title":"Studies of TiO2 Breakdown Under Pulsed Conditions","authors":"G. Zhao, R. Joshi, V. Lakdawala, E. Schamiloglu, H. Hjalmarson","doi":"10.1109/CEIDP.2006.311941","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311941","url":null,"abstract":"Model studies of current conduction and breakdown in TiO2 were carried out. Our simulation results indicate that electrical breakdown of TiO2 under multiple pulsed conditions can occur at lower voltages as compared to quasi-DC biasing. This is in agreement with experimental data. The results are indicative of a cumulative effect. We hypothesize that the lower breakdown voltages observed in TiO2 under pulsed conditions, is a direct rise-time effect, coupled with cummulative detrapping.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114055558","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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