Pub Date : 2013-10-08DOI: 10.1109/ICSD.2013.6619792
E. Logakis, L. Petersson, J. Viertel
The dielectric behavior and the molecular dynamics of pure low density polyethylene films are studied by dielectric spectroscopy and thermally stimulated depolarization current techniques. Three dielectric relaxations processes are observed, analyzed and discussed in terms of their activation energies, shapes, and temperature dependences of relaxation times and dielectric strengths.
{"title":"Dielectric spectroscopy and thermally stimulated depolarization current investigations in low density polyethylene","authors":"E. Logakis, L. Petersson, J. Viertel","doi":"10.1109/ICSD.2013.6619792","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619792","url":null,"abstract":"The dielectric behavior and the molecular dynamics of pure low density polyethylene films are studied by dielectric spectroscopy and thermally stimulated depolarization current techniques. Three dielectric relaxations processes are observed, analyzed and discussed in terms of their activation energies, shapes, and temperature dependences of relaxation times and dielectric strengths.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"3 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":"115114130","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.2013.6619834
Y. Kikuchi, Shinji Kashiwagi, T. Takada, H. Miyake, Y. Tanaka
Effect of electron beam irradiation on dielectric properties in various insulating materials for spacecraft is investigated using PEA (Pulsed Electro-Acoustic) method. In space environment, spacecraft is exposed to plasma or radioactive-rays. In such condition, multilayer insulating materials covering the spacecraft are charged up. Sometimes the charge accumulation causes to the serious damage to the electric devices and degradation of insulating materials. To investigate the change of the electrical properties of dielectrics by electron beam irradiation, we measure the space charge distributions and the conduction current in some e-beam irradiated materials under dc stress. From the measurement results, it was found that the large amount of charges accumulated in some irradiated materials under dc stress, while almost no charges accumulated in the non-irradiated materials under the same stress.
{"title":"Space charge accumulation and degradation in electron beam irradiated dielectrics for spacecraft","authors":"Y. Kikuchi, Shinji Kashiwagi, T. Takada, H. Miyake, Y. Tanaka","doi":"10.1109/ICSD.2013.6619834","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619834","url":null,"abstract":"Effect of electron beam irradiation on dielectric properties in various insulating materials for spacecraft is investigated using PEA (Pulsed Electro-Acoustic) method. In space environment, spacecraft is exposed to plasma or radioactive-rays. In such condition, multilayer insulating materials covering the spacecraft are charged up. Sometimes the charge accumulation causes to the serious damage to the electric devices and degradation of insulating materials. To investigate the change of the electrical properties of dielectrics by electron beam irradiation, we measure the space charge distributions and the conduction current in some e-beam irradiated materials under dc stress. From the measurement results, it was found that the large amount of charges accumulated in some irradiated materials under dc stress, while almost no charges accumulated in the non-irradiated materials under the same stress.","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":"115689305","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.2013.6619745
F. Guastavino, F. Porcile, A. Ratto, E. Torello
The adoption of switching electronic converters for squirrel cage motor drives can lead to some critical issues during operation. Among the others, one of the most deeply investigated problems is the early failures of the stator winding insulation. When the motors are supplied by power electronic converters the stator insulation system is indeed subjected to some peculiar electrical stresses; the fast transients lead to an uneven distribution of potential along the windings and to the presence of over-voltages at the motor terminals when the connection cable between the converter and the machine is longer than few meters, usually ten or more. Since one of the parameters that has a major influence on such phenomena is the voltage rise time of the inverter output pulses, the stress for the insulation is enhanced by the adoption of ultra fast IGBT switching devices. The aim of this research activity is to realize a new high voltage pulse generator so that both the peak voltage of the generated pulses and their rise times can be varied in order to characterize Type I insulating systems of the electrical machines windings.
{"title":"New high voltage pulse generator for Type I wire wound winding of electrical machines","authors":"F. Guastavino, F. Porcile, A. Ratto, E. Torello","doi":"10.1109/ICSD.2013.6619745","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619745","url":null,"abstract":"The adoption of switching electronic converters for squirrel cage motor drives can lead to some critical issues during operation. Among the others, one of the most deeply investigated problems is the early failures of the stator winding insulation. When the motors are supplied by power electronic converters the stator insulation system is indeed subjected to some peculiar electrical stresses; the fast transients lead to an uneven distribution of potential along the windings and to the presence of over-voltages at the motor terminals when the connection cable between the converter and the machine is longer than few meters, usually ten or more. Since one of the parameters that has a major influence on such phenomena is the voltage rise time of the inverter output pulses, the stress for the insulation is enhanced by the adoption of ultra fast IGBT switching devices. The aim of this research activity is to realize a new high voltage pulse generator so that both the peak voltage of the generated pulses and their rise times can be varied in order to characterize Type I insulating systems of the electrical machines windings.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"28 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":"120950813","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.2013.6619832
R. Gerhard
The performance of electro-electrets (dielectric elastomers) for actuator and sensor applications relies on high relative permittivity and low elastic modulus. Recent advances in the chemical modification of silicone elastomers allow for the stable attachment of molecular dipoles to the elastomer network, which leads to an overall improvement by a factor of 6 through an increase of the dielectric permittivity and a decrease of the elastic modulus. Similar and alternate routes may also be possible for polyurethane and other dielectric elastomers. Space-charge electret films and ferroelectret systems depend on the thermal and long-term stability of trapped charges on the surface or in the bulk of the respective polymer materials. Recently, chemical surface treatments of electret polymers have been developed and have resulted in much higher charge stabilities even on standard polymers such as polyethylene, but also on fluoropolymers that already exhibited rather good charge stabilities. The treatment relies on gas or fluid exposure and is suitable not only for polymer films, but also for piezoelectret systems with open channels. Ferroelectric polymers from the polyvinylidene-fluoride (PVDF) family show useful piezo- and pyroelectric properties if they can be prepared in the relevant all-trans conformation that leads to parallel packing of the molecular dipoles in the crystalline β phase. Recent successful experiments with the addition of ionic liquids to a PVDF solution yielded β-phase crystallites without further processing and thus allowed for the preparation of pyro-and piezoelectric polymer films from solution even by means of coating onto substrates. Similar routes may also be available for VDF copolymers and for inducing favorable orientations of polar polymer units inside ferroelectric polymer films. The above-mentioned and other related advances in the research on dielectrics for electret applications share the common feature that they are only possible through a combination of physics and chemistry at the molecular level or the nano-scale. If the new approaches are sustainable and successful also in the relevant industry, they may lead to significant improvements of electret materials and possibly of other dielectrics as well.
{"title":"Improving essential properties of dielectrics for electro-electrets, piezo-electrets and ferroelectric polymer electrets via physico-chemical routes","authors":"R. Gerhard","doi":"10.1109/ICSD.2013.6619832","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619832","url":null,"abstract":"The performance of electro-electrets (dielectric elastomers) for actuator and sensor applications relies on high relative permittivity and low elastic modulus. Recent advances in the chemical modification of silicone elastomers allow for the stable attachment of molecular dipoles to the elastomer network, which leads to an overall improvement by a factor of 6 through an increase of the dielectric permittivity and a decrease of the elastic modulus. Similar and alternate routes may also be possible for polyurethane and other dielectric elastomers. Space-charge electret films and ferroelectret systems depend on the thermal and long-term stability of trapped charges on the surface or in the bulk of the respective polymer materials. Recently, chemical surface treatments of electret polymers have been developed and have resulted in much higher charge stabilities even on standard polymers such as polyethylene, but also on fluoropolymers that already exhibited rather good charge stabilities. The treatment relies on gas or fluid exposure and is suitable not only for polymer films, but also for piezoelectret systems with open channels. Ferroelectric polymers from the polyvinylidene-fluoride (PVDF) family show useful piezo- and pyroelectric properties if they can be prepared in the relevant all-trans conformation that leads to parallel packing of the molecular dipoles in the crystalline β phase. Recent successful experiments with the addition of ionic liquids to a PVDF solution yielded β-phase crystallites without further processing and thus allowed for the preparation of pyro-and piezoelectric polymer films from solution even by means of coating onto substrates. Similar routes may also be available for VDF copolymers and for inducing favorable orientations of polar polymer units inside ferroelectric polymer films. The above-mentioned and other related advances in the research on dielectrics for electret applications share the common feature that they are only possible through a combination of physics and chemistry at the molecular level or the nano-scale. If the new approaches are sustainable and successful also in the relevant industry, they may lead to significant improvements of electret materials and possibly of other dielectrics as well.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"14 54 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":"127194806","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.2013.6619856
N. Guo, J. Zhang, Liwei Liu, Taiming Zhang, Xiaohong Zhang
Epoxy/organic-montmorillonite nanocomposites were prepared with different organic-montmorillonite and content of montmorillonite by diglycidyl ether of bisphenol A. Chemical composition of different organic-montmorillonite was analyzed by Fourier Transition Infrared(FTIR). The temperature properties of resistivity of composites were measured by Megger. The temperature dependence of composites dielectric spectrum was verified by using a Schering bridge. The results show that whether octadecyl ammonium chloride or the coupling agent KH550, they can interact with the montmorillonite both. The test results of the composite indicated that, inclusion of K-MMT and O-MMT into epoxy matrix can reduce permittivity and dissipation factor. The permittivity and dissipation factor of K-MMT/EP composites respectively reduced 5% and 35%, and those of O-MMT/EP composites respectively reduced 16% and 41%, when testing temperature is 160°C. It can be confirmed that epoxy improved by organic-montmorillonite is provided with better heat resistance property than those of pure epoxy. As for O-MMT/EP composites, the permittivity and dissipation factor of composites that contains 5wt% O-MMT is lowest. For instance, the permittivity reduced 18% and the dissipation factor reduced 42% than pure epoxy, when it is room temperature and power frequency.
{"title":"Effect of interface polarization on dielectric properties in nanocomposite compounded with epoxy and montmorillonite","authors":"N. Guo, J. Zhang, Liwei Liu, Taiming Zhang, Xiaohong Zhang","doi":"10.1109/ICSD.2013.6619856","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619856","url":null,"abstract":"Epoxy/organic-montmorillonite nanocomposites were prepared with different organic-montmorillonite and content of montmorillonite by diglycidyl ether of bisphenol A. Chemical composition of different organic-montmorillonite was analyzed by Fourier Transition Infrared(FTIR). The temperature properties of resistivity of composites were measured by Megger. The temperature dependence of composites dielectric spectrum was verified by using a Schering bridge. The results show that whether octadecyl ammonium chloride or the coupling agent KH550, they can interact with the montmorillonite both. The test results of the composite indicated that, inclusion of K-MMT and O-MMT into epoxy matrix can reduce permittivity and dissipation factor. The permittivity and dissipation factor of K-MMT/EP composites respectively reduced 5% and 35%, and those of O-MMT/EP composites respectively reduced 16% and 41%, when testing temperature is 160°C. It can be confirmed that epoxy improved by organic-montmorillonite is provided with better heat resistance property than those of pure epoxy. As for O-MMT/EP composites, the permittivity and dissipation factor of composites that contains 5wt% O-MMT is lowest. For instance, the permittivity reduced 18% and the dissipation factor reduced 42% than pure epoxy, when it is room temperature and power frequency.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"13 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":"125775103","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.2013.6619802
R. Villarroel, B. García, J. Burgos, D. García
In the last years great attention has been paid to ester fluids as an alternative to mineral oil. At the present the use of these liquids is becoming an habitual practice in distribution transformers and some experiences are also starting to be reported about their application to power transformers. One of the main differences between ester fluids and mineral oils is that those are able to absorb much greater amounts of water when they are in contact with cellulosic insulation. Moisture is one of the key variables that must be kept under control for a safe transformer operation. As is well known the distribution of moisture between transformer solid and liquid insulation depends on transformer temperature, and thus a continuous migration of moisture between both materials takes place during transformer normal operation. In the case of transformers isolated with ester fluids, the equilibrium points, and probably the time constants of the migration processes, would be affected by the different properties of these materials with regard to moisture. In this work the moisture dynamics in ester fluids is compared with that in mineral oils. Drying processes of pressboard has been experimentally simulated using mineral oil and a natural ester as insulating fluid. The results of these experiments will be used in the future to develop dynamic models that will allow to simulate the moisture migration processes in transformer insulation during normal operation as well as transformer drying processes.
{"title":"Experimental study on moisture dynamics in transformers insulated with natural-esters","authors":"R. Villarroel, B. García, J. Burgos, D. García","doi":"10.1109/ICSD.2013.6619802","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619802","url":null,"abstract":"In the last years great attention has been paid to ester fluids as an alternative to mineral oil. At the present the use of these liquids is becoming an habitual practice in distribution transformers and some experiences are also starting to be reported about their application to power transformers. One of the main differences between ester fluids and mineral oils is that those are able to absorb much greater amounts of water when they are in contact with cellulosic insulation. Moisture is one of the key variables that must be kept under control for a safe transformer operation. As is well known the distribution of moisture between transformer solid and liquid insulation depends on transformer temperature, and thus a continuous migration of moisture between both materials takes place during transformer normal operation. In the case of transformers isolated with ester fluids, the equilibrium points, and probably the time constants of the migration processes, would be affected by the different properties of these materials with regard to moisture. In this work the moisture dynamics in ester fluids is compared with that in mineral oils. Drying processes of pressboard has been experimentally simulated using mineral oil and a natural ester as insulating fluid. The results of these experiments will be used in the future to develop dynamic models that will allow to simulate the moisture migration processes in transformer insulation during normal operation as well as transformer drying processes.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"50 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":"125860001","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.2013.6619751
Ye Tian, Yangchun Cheng, Yuning Zhang, Chengrong Li, Yuan Yang, Yan-peng Gong
Comparing with the traditional IEC pulse current detection method, wide bandwidth pulse current method can reflect the impulse's real features due to its very wide bandwidth and large amount of information. So a wideband transformer partial discharge (PD) online monitoring system is introduced in this paper, it consists of wideband current sensors, amplifiers, filters, a 50Hz phase generator, a digital oscilloscope and a computer. The wideband current sensors' measuring bandwidth ranges from 20 kHz to more than 80 MHz; the computer controls the whole data collection process and the software platform was developed using the Labview. All the equipment in this system can be powered by batteries; the 50Hz phase generator can provide the references phase instead the 220V AC power source. The signals obtained by the current sensors are sent into the digital oscilloscope after being amplified and filtered as needed, then comprehensively adopt the Fourier series method and the equivalent time-frequency method to estimate the interference of the original data. This system has been tested both in the laboratory and on the real transformers without power cut and has been proven to work effectively.
{"title":"The design and field application of transformers on-line detection device based on the wide-band method","authors":"Ye Tian, Yangchun Cheng, Yuning Zhang, Chengrong Li, Yuan Yang, Yan-peng Gong","doi":"10.1109/ICSD.2013.6619751","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619751","url":null,"abstract":"Comparing with the traditional IEC pulse current detection method, wide bandwidth pulse current method can reflect the impulse's real features due to its very wide bandwidth and large amount of information. So a wideband transformer partial discharge (PD) online monitoring system is introduced in this paper, it consists of wideband current sensors, amplifiers, filters, a 50Hz phase generator, a digital oscilloscope and a computer. The wideband current sensors' measuring bandwidth ranges from 20 kHz to more than 80 MHz; the computer controls the whole data collection process and the software platform was developed using the Labview. All the equipment in this system can be powered by batteries; the 50Hz phase generator can provide the references phase instead the 220V AC power source. The signals obtained by the current sensors are sent into the digital oscilloscope after being amplified and filtered as needed, then comprehensively adopt the Fourier series method and the equivalent time-frequency method to estimate the interference of the original data. This system has been tested both in the laboratory and on the real transformers without power cut and has been proven to work effectively.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"99 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":"123678224","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.2013.6619831
T. Billard, F. Fresnet, M. Makarov, T. Lebey, P. Castelan, P. Bidan, S. Dinculescu
This paper deals with partial discharge measurements in twisted pair fed by a PWM inverter. Measurements are carried out using antenna sensors. Both D-Dot sensor and self-made sensors are compared when it comes to detect partial discharge in a PWM environment. High-pass filter performance is tested as well with these sensors. Finally, a innovative noise suppression method is demonstrated using two identical antenna sensors. This method could be a useful and simple mean to improve signal to noise ratio before signal processing.
{"title":"Partial discharges monitoring in twisted pair fed with PWM inverter using non-intrusive sensors","authors":"T. Billard, F. Fresnet, M. Makarov, T. Lebey, P. Castelan, P. Bidan, S. Dinculescu","doi":"10.1109/ICSD.2013.6619831","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619831","url":null,"abstract":"This paper deals with partial discharge measurements in twisted pair fed by a PWM inverter. Measurements are carried out using antenna sensors. Both D-Dot sensor and self-made sensors are compared when it comes to detect partial discharge in a PWM environment. High-pass filter performance is tested as well with these sensors. Finally, a innovative noise suppression method is demonstrated using two identical antenna sensors. This method could be a useful and simple mean to improve signal to noise ratio before signal processing.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"7 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":"125674612","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.2013.6619865
K. Fukunaga, M. Picollo
Terahertz spectroscopy and imaging techniques have been successfully applied to non-invasively investigate cultural heritage objects. One of the advantages of terahertz time domain imaging is that cross section images can be obtained without surface contact only by using a terahertz pulse. Experimental results revealed the presence of different preparation techniques in two medieval tempera masterpieces.
{"title":"THz techniques as a complementary non-invasive diagnostic method for the study of medieval panel paintings","authors":"K. Fukunaga, M. Picollo","doi":"10.1109/ICSD.2013.6619865","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619865","url":null,"abstract":"Terahertz spectroscopy and imaging techniques have been successfully applied to non-invasively investigate cultural heritage objects. One of the advantages of terahertz time domain imaging is that cross section images can be obtained without surface contact only by using a terahertz pulse. Experimental results revealed the presence of different preparation techniques in two medieval tempera masterpieces.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"22 6S 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":"122811352","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.2013.6619873
L. Cao, S. Grzybowski
Ethylene Propylene Rubber (EPR) has been used as the insulation for polymeric power cables for its good dielectric properties. For the typical medium voltage EPR cables, the designing electrical stress should not exceed 5 kV/mm under normal operational conditions. The majority of the EPR cables have a maximum working temperature of 105 °C with the capability of working at 140 °C for short-time period. Since the occasional over-voltage and over-current will accelerate the aging, it will be necessary to determine the life-time characteristics under the combined high electrical and thermal stress. In the study, EPR cable insulation samples of 90 μm thick were sliced from the commercial-available 15 kV EPR cable. Constant ac voltage was applied to the cable samples while the test temperature was kept at 105 °C, 140 °C, 165 °C, and 190 °C accordingly. The time-to-breakdown data were collected to extrapolate the lifetime characteristics of the tested EPR insulation samples.
{"title":"Life-time characteristics of EPR cable insulation under electrical and thermal stresses","authors":"L. Cao, S. Grzybowski","doi":"10.1109/ICSD.2013.6619873","DOIUrl":"https://doi.org/10.1109/ICSD.2013.6619873","url":null,"abstract":"Ethylene Propylene Rubber (EPR) has been used as the insulation for polymeric power cables for its good dielectric properties. For the typical medium voltage EPR cables, the designing electrical stress should not exceed 5 kV/mm under normal operational conditions. The majority of the EPR cables have a maximum working temperature of 105 °C with the capability of working at 140 °C for short-time period. Since the occasional over-voltage and over-current will accelerate the aging, it will be necessary to determine the life-time characteristics under the combined high electrical and thermal stress. In the study, EPR cable insulation samples of 90 μm thick were sliced from the commercial-available 15 kV EPR cable. Constant ac voltage was applied to the cable samples while the test temperature was kept at 105 °C, 140 °C, 165 °C, and 190 °C accordingly. The time-to-breakdown data were collected to extrapolate the lifetime characteristics of the tested EPR insulation samples.","PeriodicalId":437475,"journal":{"name":"2013 IEEE International Conference on Solid Dielectrics (ICSD)","volume":"3 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":"114592731","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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