Pub Date : 2019-06-01DOI: 10.1109/EIC43217.2019.9046603
T. Sakoda, Mitsuki Kawakone, Noriyuki Hayshi, M. Setoguchi
For epoxy resin equipment, voids may exist owing to imperfection of insulation manufacturing. The electric field becomes high in the voids, and partial discharges (PDs) occur in such defects. Incidentally, the insulation material temperature varies with the status of load and the environmental condition. It is crucial to investigate PD activity at diffe re nt void te mpe rature and electric field. In this study, we carried out measurements of PDs in an artificial void of epoxy resin at various temperatures in the range of 30_50 degrees Celsius. The maximum electric fields in the void 1.5 mm in diameter were set at 4.6 kV/mm and 8.0 kV/mm. For a 4.6 kV/mm-void, the number of PDs was large at lower temperature at around 30 degrees Celsius. The number of PDs de cre ase d with the incre ase of the numbe r of te mpe rature-time cycles. The PD magnitude slightly incre ase d with the increase of temperature because the dielectric constant of epoxy resin might become high and the electric field in a void might become high. In contrast, the variation tendency of the number of PDs for an 8 kV/mm-void was much different from that for a 4.6 kV/mm-void. The number of PDs was large at around 50 degrees Celsius and in the middle of temperature rising from 40 to 50 degrees Celsius. Thus, we investigated that PD behavior during temperature-time cycles differs in electric field.
{"title":"Material Temperature Dependence on Behavior of Partial Discharge in Epoxy Resin","authors":"T. Sakoda, Mitsuki Kawakone, Noriyuki Hayshi, M. Setoguchi","doi":"10.1109/EIC43217.2019.9046603","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046603","url":null,"abstract":"For epoxy resin equipment, voids may exist owing to imperfection of insulation manufacturing. The electric field becomes high in the voids, and partial discharges (PDs) occur in such defects. Incidentally, the insulation material temperature varies with the status of load and the environmental condition. It is crucial to investigate PD activity at diffe re nt void te mpe rature and electric field. In this study, we carried out measurements of PDs in an artificial void of epoxy resin at various temperatures in the range of 30_50 degrees Celsius. The maximum electric fields in the void 1.5 mm in diameter were set at 4.6 kV/mm and 8.0 kV/mm. For a 4.6 kV/mm-void, the number of PDs was large at lower temperature at around 30 degrees Celsius. The number of PDs de cre ase d with the incre ase of the numbe r of te mpe rature-time cycles. The PD magnitude slightly incre ase d with the increase of temperature because the dielectric constant of epoxy resin might become high and the electric field in a void might become high. In contrast, the variation tendency of the number of PDs for an 8 kV/mm-void was much different from that for a 4.6 kV/mm-void. The number of PDs was large at around 50 degrees Celsius and in the middle of temperature rising from 40 to 50 degrees Celsius. Thus, we investigated that PD behavior during temperature-time cycles differs in electric field.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128934112","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046547
W. McDermid, M. Partyka, T. Black
During the period of 1993–1995 Manitoba Hydro investigated the claim by a service provider that water trees could be detected and located in service aged medium voltage XLPE cables by means of time domain reflectometry (TDR) following conditioning of the cable dielectric with direct voltage. In order to avoid subsequent short time in-service failures, it was necessary to limit the conditioning voltage to 0.5 per-unit. With this restriction, no conditioning related surge impedance anomalies were found in cable that subsequently was determined as containing substantial vented water trees. However, it was established that the measurement of leakage current at 0.5 per-unit negative polarity direct voltage did correlate with the magnitude of subsequent 0.1 Hz breakdown voltage. Beginning in 2014 Manitoba Hydro has been assessing service aged medium voltage XLPE cables using Tangent Delta measurements at 0.1 Hz voltages in accordance with IEEE Std 400.2. However, the notion that water tress can be detected and located as a result of conditioning with direct voltage is still of interest as is indicated by publications that have appeared in the literature in recent years, but the related conditioning utilizes direct voltages in excess of 0.5 per-unit.
{"title":"Water Tree Detection in Medium Voltage XLPE Cables","authors":"W. McDermid, M. Partyka, T. Black","doi":"10.1109/EIC43217.2019.9046547","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046547","url":null,"abstract":"During the period of 1993–1995 Manitoba Hydro investigated the claim by a service provider that water trees could be detected and located in service aged medium voltage XLPE cables by means of time domain reflectometry (TDR) following conditioning of the cable dielectric with direct voltage. In order to avoid subsequent short time in-service failures, it was necessary to limit the conditioning voltage to 0.5 per-unit. With this restriction, no conditioning related surge impedance anomalies were found in cable that subsequently was determined as containing substantial vented water trees. However, it was established that the measurement of leakage current at 0.5 per-unit negative polarity direct voltage did correlate with the magnitude of subsequent 0.1 Hz breakdown voltage. Beginning in 2014 Manitoba Hydro has been assessing service aged medium voltage XLPE cables using Tangent Delta measurements at 0.1 Hz voltages in accordance with IEEE Std 400.2. However, the notion that water tress can be detected and located as a result of conditioning with direct voltage is still of interest as is indicated by publications that have appeared in the literature in recent years, but the related conditioning utilizes direct voltages in excess of 0.5 per-unit.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124105053","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046536
R. Acheen, C. Abadie, T. Billard, T. Lebey, S. Duchesne
Voltage inverters based on the pulse width modulation are widely used for applications that require controlling rotation speed. The devices used today to create pulse width modulation are Silicon (Si) IGBTs. The use of IGBTs enables to generate rising edges of tens of kV /µs, and to reach switching frequencies around 20 kHz. These improvements have helped to reduce switching losses and motor torque ripple. On the other hand, the reliability of motors has declined dramatically. The causes of motor failures may be due to different phenomena, but one of the main ageing mechanisms is the erosion of the different insulation materials induced by Partial Discharges (PD). For high voltage, high power and/or high frequency applications, silicon carbide (SiC) based components will in most of the case replace the current silicon-based components. If some works have already been achieved for on-line PD detection in low voltage motors fed by inverters using Si-IGBT technology, works are now needed when SiC-based components are used. For motors fed by low voltage, PDs mainly occur during the voltage edge. It is therefore necessary to discriminate them from the noise induced by switchings. The use of high pass filters proved its effectiveness for IGBTs but the use of SiC MOSFET will result in an increase of switching speed and consequently an increase of the noise frequency. For such conditions, it may be difficult to differentiate partial discharges from noise. This paper presents a study on the partial discharge inception voltage, on the ability to detect partial discharges and on the voltage stresses in motors supplied by SiC-MOSFET and Si-IGBT inverters. These results are discussed and possible strategies are proposed.
{"title":"Study of partial discharge detection in motors fed by SiC MOSFET and Si IGBT inverters","authors":"R. Acheen, C. Abadie, T. Billard, T. Lebey, S. Duchesne","doi":"10.1109/EIC43217.2019.9046536","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046536","url":null,"abstract":"Voltage inverters based on the pulse width modulation are widely used for applications that require controlling rotation speed. The devices used today to create pulse width modulation are Silicon (Si) IGBTs. The use of IGBTs enables to generate rising edges of tens of kV /µs, and to reach switching frequencies around 20 kHz. These improvements have helped to reduce switching losses and motor torque ripple. On the other hand, the reliability of motors has declined dramatically. The causes of motor failures may be due to different phenomena, but one of the main ageing mechanisms is the erosion of the different insulation materials induced by Partial Discharges (PD). For high voltage, high power and/or high frequency applications, silicon carbide (SiC) based components will in most of the case replace the current silicon-based components. If some works have already been achieved for on-line PD detection in low voltage motors fed by inverters using Si-IGBT technology, works are now needed when SiC-based components are used. For motors fed by low voltage, PDs mainly occur during the voltage edge. It is therefore necessary to discriminate them from the noise induced by switchings. The use of high pass filters proved its effectiveness for IGBTs but the use of SiC MOSFET will result in an increase of switching speed and consequently an increase of the noise frequency. For such conditions, it may be difficult to differentiate partial discharges from noise. This paper presents a study on the partial discharge inception voltage, on the ability to detect partial discharges and on the voltage stresses in motors supplied by SiC-MOSFET and Si-IGBT inverters. These results are discussed and possible strategies are proposed.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130426461","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046562
S. Iwata, Ryota Kitani, T. Takada
The degradation of insulating property of polymeric materials was evaluated by the new diagnostic technique of current integration system, hereafter referred to as the “Q(t)-meter”. The Q(t)-meter measures the change with time in integrated charge accumulated by a capacitor inserted between a DC high-voltage power supply and a sample of the insulation material under study. Q(t)-meter is suitable for the monitoring of time dependence of leakage current of the insulating sample under DC voltage. To demonstrate the performance of this new device, we evaluated the influence of generation and propagation of “electrical tree” in epoxy resin sample on DC leakage current. The electrical tree is a typical electrical degradation of polymeric materials. Hence, nondestructive diagnostic methods for electrical tree are expected. In this study, the electrical tree was generated in the epoxy resin by AC high voltage between two needle electrodes. The interelectrode distance was 2 mm. In the Q(t) measurement, the sampling frequency, total sampling time, DC applied time, and test voltages were 2 s, 600 s, 900 s, 250-1,000 V, respectively. We conducted Q(t) measurement at three stages of electrical treeing - before tree generation, after tree generation, and after tree propagation. It was found that the leakage current increased with increase in the tree length. A remarkable trend of steep rise and fall in the Q(t) curve was also observed. Experimental results obtained by the Q(t)-meter were analyzed assuming an “RC circuit model”.
{"title":"Diagnostic Technique for Electrical Tree by Current Integration Method","authors":"S. Iwata, Ryota Kitani, T. Takada","doi":"10.1109/EIC43217.2019.9046562","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046562","url":null,"abstract":"The degradation of insulating property of polymeric materials was evaluated by the new diagnostic technique of current integration system, hereafter referred to as the “Q(t)-meter”. The Q(t)-meter measures the change with time in integrated charge accumulated by a capacitor inserted between a DC high-voltage power supply and a sample of the insulation material under study. Q(t)-meter is suitable for the monitoring of time dependence of leakage current of the insulating sample under DC voltage. To demonstrate the performance of this new device, we evaluated the influence of generation and propagation of “electrical tree” in epoxy resin sample on DC leakage current. The electrical tree is a typical electrical degradation of polymeric materials. Hence, nondestructive diagnostic methods for electrical tree are expected. In this study, the electrical tree was generated in the epoxy resin by AC high voltage between two needle electrodes. The interelectrode distance was 2 mm. In the Q(t) measurement, the sampling frequency, total sampling time, DC applied time, and test voltages were 2 s, 600 s, 900 s, 250-1,000 V, respectively. We conducted Q(t) measurement at three stages of electrical treeing - before tree generation, after tree generation, and after tree propagation. It was found that the leakage current increased with increase in the tree length. A remarkable trend of steep rise and fall in the Q(t) curve was also observed. Experimental results obtained by the Q(t)-meter were analyzed assuming an “RC circuit model”.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126386806","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046521
A. Cavallini, Luca Lusardi, A. Rumi, K. Kimura, A. Contin, T. Han
Partial discharge testing of complete, low voltage induction machines using the configurations proposed in the IEC 60034-27-5CD, is discussed. Based on tests performed on a machine with accessible coil terminals, the most promising configurations for type tests and quality control, is proposed and the limits of the IEC 60034-18-41 highlighted.
{"title":"Searching for Optimal Connection Schemes for Partial Discharge Testing of Inverter-Fed Rotating Machines","authors":"A. Cavallini, Luca Lusardi, A. Rumi, K. Kimura, A. Contin, T. Han","doi":"10.1109/EIC43217.2019.9046521","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046521","url":null,"abstract":"Partial discharge testing of complete, low voltage induction machines using the configurations proposed in the IEC 60034-27-5CD, is discussed. Based on tests performed on a machine with accessible coil terminals, the most promising configurations for type tests and quality control, is proposed and the limits of the IEC 60034-18-41 highlighted.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133526568","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046637
C. Mackinnon, B. Stewart
High voltage capacitors are becoming ever more prevalent on modern electrical power networks, as they offer simple means of power factor correction and voltage support, and are inherent to modern power electronic converter designs. Large capacitor banks comprise many modules, each of which contains an array of individual elements, across which voltage stresses and thermal conditions are shared. A module's partial degradation due to short-circuited elements can increase stresses on the insulation of those that remain, sometimes leading to cascading element failure. This paper presents a high voltage capacitor model, and then explores the distribution of voltage under healthy and short-circuit scenarios. It shows voltage distributions between elements within a capacitor module have nonlinearity due to a module's geometry, and are affected by series element failure.
{"title":"A High Voltage Capacitor Element Model","authors":"C. Mackinnon, B. Stewart","doi":"10.1109/EIC43217.2019.9046637","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046637","url":null,"abstract":"High voltage capacitors are becoming ever more prevalent on modern electrical power networks, as they offer simple means of power factor correction and voltage support, and are inherent to modern power electronic converter designs. Large capacitor banks comprise many modules, each of which contains an array of individual elements, across which voltage stresses and thermal conditions are shared. A module's partial degradation due to short-circuited elements can increase stresses on the insulation of those that remain, sometimes leading to cascading element failure. This paper presents a high voltage capacitor model, and then explores the distribution of voltage under healthy and short-circuit scenarios. It shows voltage distributions between elements within a capacitor module have nonlinearity due to a module's geometry, and are affected by series element failure.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"305 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131427027","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046623
S. Ilhan, D. Tuzun, A. Ozdemir
This paper presents tracking and erosion performance of high temperature vulcanizing (HTV) silicone rubber (SIR) materials for different filler loadings. Different concentrations of alumina trihydrate (ATH) filler particles of $3.6 mumathrm{m}$ median size and silica (SiO2) filler particles of $4 mumathrm{m}$ median size are considered together with HTV-SIR material. Tracking and erosion performance of the compositions were evaluated by using standard inclined plane (IP) tracking and erosion tests, according to IEe 60587 standard. IP tests are performed at 3.5 kV power frequency (50 Hz) constant test voltages, for 0.3 ml/min contamination flow rate, at an ambient temperature of $pmb{23}pm pmb{2} {}^{circ}mathbf{C}$, and for six hours of test periods. Time-to-failures, eroded masses, and leakage currents of HTV-SIR filled with ATH and silica particles are investigated for different filler concentrations.
研究了不同填料用量下高温硫化硅橡胶(SIR)材料的跟踪和腐蚀性能。在hhtv - sir材料中考虑了不同浓度的中位数尺寸为3.6 mu mathm {m}$的三水合氧化铝(ATH)填充颗粒和中位数尺寸为4 mu mathm {m}$的二氧化硅(SiO2)填充颗粒。根据ie60587标准，采用标准斜面跟踪和冲蚀试验对组合物的跟踪和冲蚀性能进行了评价。IP测试在3.5 kV工频(50 Hz)恒定测试电压下进行，污染流速为0.3 ml/min，环境温度为$pmb{23}pm pmb{2} {}^{circ}mathbf{C}$，测试周期为6小时。研究了不同填料浓度下填充ATH和二氧化硅颗粒的HTV-SIR的失效时间、侵蚀质量和泄漏电流。
{"title":"Electrical Performance of HTV Silicone Rubber under Different Fillers and Filler Loadings","authors":"S. Ilhan, D. Tuzun, A. Ozdemir","doi":"10.1109/EIC43217.2019.9046623","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046623","url":null,"abstract":"This paper presents tracking and erosion performance of high temperature vulcanizing (HTV) silicone rubber (SIR) materials for different filler loadings. Different concentrations of alumina trihydrate (ATH) filler particles of $3.6 mumathrm{m}$ median size and silica (SiO2) filler particles of $4 mumathrm{m}$ median size are considered together with HTV-SIR material. Tracking and erosion performance of the compositions were evaluated by using standard inclined plane (IP) tracking and erosion tests, according to IEe 60587 standard. IP tests are performed at 3.5 kV power frequency (50 Hz) constant test voltages, for 0.3 ml/min contamination flow rate, at an ambient temperature of $pmb{23}pm pmb{2} {}^{circ}mathbf{C}$, and for six hours of test periods. Time-to-failures, eroded masses, and leakage currents of HTV-SIR filled with ATH and silica particles are investigated for different filler concentrations.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"406 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128188029","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046537
T. Nguyen
To process and test high voltage sample bars or full-sized coils of a generator or motor stator, requires an investment of time and expense. If there is a way to break the testing down into small parts using smaller specimens, time and expense could be saved. In this study, samples were prepared using 80% to 90% of epoxy, unsaturated polyester and polybutadiene-impregnating resins with 10% to 20% of various mica binder resins for the test. Multiple studies of these combinations of both resins would be conducted. With the studies of these properties, results should identify a potential screening procedure for the selection of resins prior to the impregnation of high voltage coils or test bars.
{"title":"Compatibility of Mica Binder Resins with Medium and High Voltage Impregnation Resins","authors":"T. Nguyen","doi":"10.1109/EIC43217.2019.9046537","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046537","url":null,"abstract":"To process and test high voltage sample bars or full-sized coils of a generator or motor stator, requires an investment of time and expense. If there is a way to break the testing down into small parts using smaller specimens, time and expense could be saved. In this study, samples were prepared using 80% to 90% of epoxy, unsaturated polyester and polybutadiene-impregnating resins with 10% to 20% of various mica binder resins for the test. Multiple studies of these combinations of both resins would be conducted. With the studies of these properties, results should identify a potential screening procedure for the selection of resins prior to the impregnation of high voltage coils or test bars.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129280527","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046530
T. Matsuzoe, N. Kita, Y. Nishigaki, Tsuyoshi Abe, Tomohiro Kubo, Y. Nakano, M. Kozako, M. Hikita, N. Fujimoto, N. Hayashizaka, S. Fujimoto, Toshihiko Kato
In recent years, small and medium size generators are used as engine generators. The authors aim to develop enamelled wire that exceeds conventional resin insulation lifetime. Among nanocomposite materials, boehmite-based materials are reported to have a longer lifetime than silica-based materials, and they are expected as new insulating materials for enamel wire insulation layer. In this paper, we report on the effect of boehmite filler on dielectric properties and AC conductivity by acquiring complex permittivity and AC conductivity of a film sample with nano-boehmite alumina added to polyimide resin compared with those of samples with silica nano-fillers and without nano-fillers. As a result, it is suggested that the ionic carrier is more likely to move in the polyimide sample with AIOOH filler than in the neat sample in the high temperature region of 180 °C. From the above results, it is considered that the conductivity and the relative permittivity increase in the high temperature and low frequency region are due to the influence of crystal water of boehmite. In addition, measurements of life time of enamel twisted pair samples coated with polyimide filled with boehmite alumina nano-filliers were also made with comparison to that of samples without the boehmite alumina fillers.
{"title":"Dielectric and Insulation Properties of Polyimide-based Boehmite Nanocomposite Material","authors":"T. Matsuzoe, N. Kita, Y. Nishigaki, Tsuyoshi Abe, Tomohiro Kubo, Y. Nakano, M. Kozako, M. Hikita, N. Fujimoto, N. Hayashizaka, S. Fujimoto, Toshihiko Kato","doi":"10.1109/EIC43217.2019.9046530","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046530","url":null,"abstract":"In recent years, small and medium size generators are used as engine generators. The authors aim to develop enamelled wire that exceeds conventional resin insulation lifetime. Among nanocomposite materials, boehmite-based materials are reported to have a longer lifetime than silica-based materials, and they are expected as new insulating materials for enamel wire insulation layer. In this paper, we report on the effect of boehmite filler on dielectric properties and AC conductivity by acquiring complex permittivity and AC conductivity of a film sample with nano-boehmite alumina added to polyimide resin compared with those of samples with silica nano-fillers and without nano-fillers. As a result, it is suggested that the ionic carrier is more likely to move in the polyimide sample with AIOOH filler than in the neat sample in the high temperature region of 180 °C. From the above results, it is considered that the conductivity and the relative permittivity increase in the high temperature and low frequency region are due to the influence of crystal water of boehmite. In addition, measurements of life time of enamel twisted pair samples coated with polyimide filled with boehmite alumina nano-filliers were also made with comparison to that of samples without the boehmite alumina fillers.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125502516","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046627
R. Cortés, F. E. Cortes, R. Linares y Miranda, A. Ozdemir, S. Ilhan
In this paper, a methodology based on the finite element method is used to analyze the corona onset voltage on different structures of HVDC lines, the methodology includes atmospheric conditions such as pressure and temperature. The results obtained in simulations were verified through two experimental set-ups (rod-to-plane and corona cage) at sea level and 2200 m above the sea level. According to the results, the predicted values are in good agreement with the measured values in most of the tested configurations. Once the accuracy of the methodology was verified, it was used to modify the conductor bundle geometry of an HVDC line to maximize the corona onset voltage. The importance of this work is due to the prediction of the corona onset voltage since corona discharge in elements of a high voltage transmission line is an undesirable phenomenon because it causes power losses and electromagnetic interference.
{"title":"Computation of the Corona Onset Voltage for DC at Two Different Altitudes","authors":"R. Cortés, F. E. Cortes, R. Linares y Miranda, A. Ozdemir, S. Ilhan","doi":"10.1109/EIC43217.2019.9046627","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046627","url":null,"abstract":"In this paper, a methodology based on the finite element method is used to analyze the corona onset voltage on different structures of HVDC lines, the methodology includes atmospheric conditions such as pressure and temperature. The results obtained in simulations were verified through two experimental set-ups (rod-to-plane and corona cage) at sea level and 2200 m above the sea level. According to the results, the predicted values are in good agreement with the measured values in most of the tested configurations. Once the accuracy of the methodology was verified, it was used to modify the conductor bundle geometry of an HVDC line to maximize the corona onset voltage. The importance of this work is due to the prediction of the corona onset voltage since corona discharge in elements of a high voltage transmission line is an undesirable phenomenon because it causes power losses and electromagnetic interference.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127159151","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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