Pub Date : 2008-10-31DOI: 10.1109/ISEIM.2008.4664569
G. Yin, J.Y. Li, S.T. Li, Pengyu Cheng
It was found that the dependence of the breakdown field E1mA and the activation energy, on Ag content are similar to that of the exponent of alphalf in low frequency region and alphahf in high frequency region on Ag content, which is a novel result in the research of varistor materials. By means of normalization of conductivity, it was found that samples with different Ag contents show similar mechanism of dielectric loss, which is suggested as the relaxation process of electron in deep level traps. The relation of ac conductivity of samples and scaling frequency shows a deviation from the master curve at high frequencies, which is due to different distribution of local energy barriers and the dynamics of mobile carriers. The results can be fully understood by means of ldquoUniversal Power Law(UPL)rdquo.
{"title":"Study on the dielectric properties of Ag doped ZnO by “Universal Power Law”","authors":"G. Yin, J.Y. Li, S.T. Li, Pengyu Cheng","doi":"10.1109/ISEIM.2008.4664569","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664569","url":null,"abstract":"It was found that the dependence of the breakdown field E1mA and the activation energy, on Ag content are similar to that of the exponent of alphalf in low frequency region and alphahf in high frequency region on Ag content, which is a novel result in the research of varistor materials. By means of normalization of conductivity, it was found that samples with different Ag contents show similar mechanism of dielectric loss, which is suggested as the relaxation process of electron in deep level traps. The relation of ac conductivity of samples and scaling frequency shows a deviation from the master curve at high frequencies, which is due to different distribution of local energy barriers and the dynamics of mobile carriers. The results can be fully understood by means of ldquoUniversal Power Law(UPL)rdquo.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132640798","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664456
Shujuan Hao, F. Zheng, Wenyan Wang, Chun Xiao, Z. An, Yewen Zhang
Packet-like space charge behavior and the isothermal decay processes of the injected charge in the neat linear low density polyethylene (LLDPE) and LLDPE doped with Al2O3 nano-particles is investigated by Pressure Wave Propagation (PWP) method. The 1 mm sheet samples sandwiched by semi-conductive electrodes are submitted to 40 kVdc/mm at 40degC for various duration. The charge injecting rate and the mobility of packet-like space charge under DC stress are compared among the samples subjected to different blending process with or without nano-particles. The slight doping concentration shows significant influence on space charge dynamics, being lower injecting rate and apparent mobility for higher doped samples. The isothermal decay process of the injected charge indicates the trap-modulated feature. The phenomena are related to the changing morphology.
{"title":"Space charge behavior of linear low density polyethylene doped with some types of inorganic nano powder","authors":"Shujuan Hao, F. Zheng, Wenyan Wang, Chun Xiao, Z. An, Yewen Zhang","doi":"10.1109/ISEIM.2008.4664456","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664456","url":null,"abstract":"Packet-like space charge behavior and the isothermal decay processes of the injected charge in the neat linear low density polyethylene (LLDPE) and LLDPE doped with Al2O3 nano-particles is investigated by Pressure Wave Propagation (PWP) method. The 1 mm sheet samples sandwiched by semi-conductive electrodes are submitted to 40 kVdc/mm at 40degC for various duration. The charge injecting rate and the mobility of packet-like space charge under DC stress are compared among the samples subjected to different blending process with or without nano-particles. The slight doping concentration shows significant influence on space charge dynamics, being lower injecting rate and apparent mobility for higher doped samples. The isothermal decay process of the injected charge indicates the trap-modulated feature. The phenomena are related to the changing morphology.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132206161","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664518
K. Nagasawa, R. Watanabe, Y. Tanaka, T. Takada
Charge accumulations in electron beam irradiated polymers are investigated by observing them using pressure wave propagation method. The purpose of our research work is to measure the charge distribution in electron beam irradiated dielectric materials for spacecrafts. We have been developing a system for measuring such a charge distribution in dielectric materials. Using this system, we tried to measure the charge distribution under electron beam irradiated various typical polymers; polyerthylene terephthalate, polystyrene, low density polythylene. As a result, itpsilas found that charging characteristics of insulating material is strongly affected by the existence of benzene ring in molecular architecture.
{"title":"Charge accumulation in election beam irradiated various polymers","authors":"K. Nagasawa, R. Watanabe, Y. Tanaka, T. Takada","doi":"10.1109/ISEIM.2008.4664518","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664518","url":null,"abstract":"Charge accumulations in electron beam irradiated polymers are investigated by observing them using pressure wave propagation method. The purpose of our research work is to measure the charge distribution in electron beam irradiated dielectric materials for spacecrafts. We have been developing a system for measuring such a charge distribution in dielectric materials. Using this system, we tried to measure the charge distribution under electron beam irradiated various typical polymers; polyerthylene terephthalate, polystyrene, low density polythylene. As a result, itpsilas found that charging characteristics of insulating material is strongly affected by the existence of benzene ring in molecular architecture.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130897100","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664562
Xuguang Li, Chuan Cai, Y. Yin
This paper researches the slow polarization characteristics Nano BaTiO3/LDPE composite prepared via double solution method. The discharging current data were recorded wand these data were converted to frequency domain via Hamon approximation in order to get dielectric factor (epsiv"). Comparing with the spectrum curves of epsiv" in the case of different electrical field, temperature and content of nano-filler, it could be seen that the density of slow polarization of composites increased with the temperature and decreased with electrical field. It is interesting that a percolation phenomenon appeared with increasing of nano-filler content.
{"title":"Study on slow polarization behavior in the composite of low density polyethylene and Nano BaTiO3 powder","authors":"Xuguang Li, Chuan Cai, Y. Yin","doi":"10.1109/ISEIM.2008.4664562","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664562","url":null,"abstract":"This paper researches the slow polarization characteristics Nano BaTiO3/LDPE composite prepared via double solution method. The discharging current data were recorded wand these data were converted to frequency domain via Hamon approximation in order to get dielectric factor (epsiv\"). Comparing with the spectrum curves of epsiv\" in the case of different electrical field, temperature and content of nano-filler, it could be seen that the density of slow polarization of composites increased with the temperature and decreased with electrical field. It is interesting that a percolation phenomenon appeared with increasing of nano-filler content.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"64 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126723283","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664523
K. Kadowski, Y. Maeda, S. Kanahara, I. Kitani, S. Kiyohara, T. Ohta, S. Mitsuya
This paper presents an experimental study on electrical tree propagation from a point electrode in an epoxy block subjected to polarity-reversed repetitive pulses after dc prestress. When the epoxy block at one end of a long coaxial cable is charged by a dc prestress and then directly grounded by closing a switch at the other end of the cable without any resistance, repetitive voltage pulses are applied to the epoxy block with a change in its polarity. In test for polarity-reversed tree with -dc prestress, tree length tends to be shorter than that for an positive impulse tree without prestress. However, the shape of the polarity-reversed tree becomes more busy. In test for polarity reversed tree with +dc prestress, tree length at room temperature is very short for both the pulses with and without the prestress because of the poor propagation capability in negative streamer. However, polarity-reversed tree at 120degC is very large because the negative streamer propagation is followed by the successive positive streamer caused by the second polarity reversal.
{"title":"Space charge effect on tree propagation in epoxy block subjected to polarity-reversed voltage pulses","authors":"K. Kadowski, Y. Maeda, S. Kanahara, I. Kitani, S. Kiyohara, T. Ohta, S. Mitsuya","doi":"10.1109/ISEIM.2008.4664523","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664523","url":null,"abstract":"This paper presents an experimental study on electrical tree propagation from a point electrode in an epoxy block subjected to polarity-reversed repetitive pulses after dc prestress. When the epoxy block at one end of a long coaxial cable is charged by a dc prestress and then directly grounded by closing a switch at the other end of the cable without any resistance, repetitive voltage pulses are applied to the epoxy block with a change in its polarity. In test for polarity-reversed tree with -dc prestress, tree length tends to be shorter than that for an positive impulse tree without prestress. However, the shape of the polarity-reversed tree becomes more busy. In test for polarity reversed tree with +dc prestress, tree length at room temperature is very short for both the pulses with and without the prestress because of the poor propagation capability in negative streamer. However, polarity-reversed tree at 120degC is very large because the negative streamer propagation is followed by the successive positive streamer caused by the second polarity reversal.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116893183","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664524
Y. Nemoto, F. Kato, N. Hirai, Y. Ohki, S. Kaneko, S. Okabe
Biodegradable polymer plasticizers, polycaprolactone (PCL) and polybutylene succinate adipate (PBSA) were blended with starch ester (SE), and their thermal properties and dielectric properties such as electrical conductivity, complex permittivity, and AC breakdown strength were examined. As a result, it has become clear that SE blends with PCL and PBSA can be used as electrical insulating materials at low voltages.
{"title":"Effects of blending various biodegradable polymer plasticizers on the conduction current and AC breakdown strength in starch ester","authors":"Y. Nemoto, F. Kato, N. Hirai, Y. Ohki, S. Kaneko, S. Okabe","doi":"10.1109/ISEIM.2008.4664524","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664524","url":null,"abstract":"Biodegradable polymer plasticizers, polycaprolactone (PCL) and polybutylene succinate adipate (PBSA) were blended with starch ester (SE), and their thermal properties and dielectric properties such as electrical conductivity, complex permittivity, and AC breakdown strength were examined. As a result, it has become clear that SE blends with PCL and PBSA can be used as electrical insulating materials at low voltages.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124630483","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664566
Yonghua Zhu, Shen Wang, Mingzhu Li, Changshun Wu
Detailed investigation on gnawing testing of rodent-proof wire and cable (RPWC) in laboratory is carried out in this paper. Most of test parameters, such as the rat choice, sample preparation, test procedure and long-term residual effect test on repellent agents, as well as the evaluation system of test result, are discussed. Finally, some proposals on gnawing testing method of RPWC are presented.
{"title":"Studying on gnawing testing method of rodent-proof wire and cable","authors":"Yonghua Zhu, Shen Wang, Mingzhu Li, Changshun Wu","doi":"10.1109/ISEIM.2008.4664566","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664566","url":null,"abstract":"Detailed investigation on gnawing testing of rodent-proof wire and cable (RPWC) in laboratory is carried out in this paper. Most of test parameters, such as the rat choice, sample preparation, test procedure and long-term residual effect test on repellent agents, as well as the evaluation system of test result, are discussed. Finally, some proposals on gnawing testing method of RPWC are presented.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123674035","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664557
Junfeng Xia, Yewen Zhang, F. Zheng, Z. An, Jianwei Zhu
Packet-like space-charge behavior in low density polyethylene (LDPE) under dc field was reported. It was found that when a high electric field above several kV/mm was applied to LDPE, a large amount of positive packet-like charge was appeared near the anode. The packet-like charge moved towards cathode and disappeared near the cathode. In this paper, a numerical simulation is proposed to discuss the packer-like charge behavior The model is based on the following assumptions, (1) the charge injected by electrode formed the space charge packet, specially exceed holes injected by anode in this paper; (2) the carrier migration rate and applied field exists a negative slope range in LDPE and it causes a space-charge packet. Furthermore, the computer simulation results are compared with the measurement results.
{"title":"Numerical simulation of space charge packet behavior in low-density polyethylene under DC stress","authors":"Junfeng Xia, Yewen Zhang, F. Zheng, Z. An, Jianwei Zhu","doi":"10.1109/ISEIM.2008.4664557","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664557","url":null,"abstract":"Packet-like space-charge behavior in low density polyethylene (LDPE) under dc field was reported. It was found that when a high electric field above several kV/mm was applied to LDPE, a large amount of positive packet-like charge was appeared near the anode. The packet-like charge moved towards cathode and disappeared near the cathode. In this paper, a numerical simulation is proposed to discuss the packer-like charge behavior The model is based on the following assumptions, (1) the charge injected by electrode formed the space charge packet, specially exceed holes injected by anode in this paper; (2) the carrier migration rate and applied field exists a negative slope range in LDPE and it causes a space-charge packet. Furthermore, the computer simulation results are compared with the measurement results.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122632863","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664582
V. Dubickas, H. Edin
In this paper a water-tree degraded insulation is modeled as a matrix composed of cubic cells. In the model there are three types of cells: pure XLPE, XLPE with water inclusion and the XLPE cell with a cylindrical water channel. Voltage dependant dielectric properties of the water-trees are modeled by an elongation of the inclusions and appearance of the conducting channels caused by the Maxwell stress. Afterwards the modeled effective permittivity of the insulation matrix is compared with the dielectric spectroscopy measurements of a field aged XLPE cable.
{"title":"Dielectric model of water trees in an XLPE cable","authors":"V. Dubickas, H. Edin","doi":"10.1109/ISEIM.2008.4664582","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664582","url":null,"abstract":"In this paper a water-tree degraded insulation is modeled as a matrix composed of cubic cells. In the model there are three types of cells: pure XLPE, XLPE with water inclusion and the XLPE cell with a cylindrical water channel. Voltage dependant dielectric properties of the water-trees are modeled by an elongation of the inclusions and appearance of the conducting channels caused by the Maxwell stress. Afterwards the modeled effective permittivity of the insulation matrix is compared with the dielectric spectroscopy measurements of a field aged XLPE cable.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"147 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122953821","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664553
L. Ding, Ying Liang, Y. Tu, Wei Wang, C.R. Li
This paper has investigated the influence of corona intensity on the hydrophobicity recovery characteristics of HTV silicone rubber (SIR) deteriorated by corona discharge. The accelerating aging experiments of HTV silicone rubber were carried out with five levels of corona voltage. The hydrophobicity recovery with time was measured by static contact angle method. The experimental results show that the hydrophobicity of HTV silicone rubber can get some recovery after the corona deterioration, and the corona intensity play an important role on static contact angle of HTV SIR. In general, the procedure of hydrophibicity recovery would be varied with the different corona intensity and varied corona deterioration duration. And the hydrophibicity would not be recovered as original when the corona intensity is high enough under an certainty deterioration duration time.
{"title":"Effect of corona intensity on the hydrophobicity recovery characteristics of HTV silicone rubber","authors":"L. Ding, Ying Liang, Y. Tu, Wei Wang, C.R. Li","doi":"10.1109/ISEIM.2008.4664553","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664553","url":null,"abstract":"This paper has investigated the influence of corona intensity on the hydrophobicity recovery characteristics of HTV silicone rubber (SIR) deteriorated by corona discharge. The accelerating aging experiments of HTV silicone rubber were carried out with five levels of corona voltage. The hydrophobicity recovery with time was measured by static contact angle method. The experimental results show that the hydrophobicity of HTV silicone rubber can get some recovery after the corona deterioration, and the corona intensity play an important role on static contact angle of HTV SIR. In general, the procedure of hydrophibicity recovery would be varied with the different corona intensity and varied corona deterioration duration. And the hydrophibicity would not be recovered as original when the corona intensity is high enough under an certainty deterioration duration time.","PeriodicalId":158811,"journal":{"name":"2008 International Symposium on Electrical Insulating Materials (ISEIM 2008)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124860419","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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