Pub Date : 2018-10-01DOI: 10.1109/CEIDP.2018.8544851
Xiangyang Peng, Zhangxiang Nie, Cuiru Yang, Zhen Huang, Xinyu Huang, Zhonghao Zhang, Liming Wang
Abnormal heating problems caused by interface failure is a common phenomenon in Power System while the mechanism of abnormal heating hasn't been fully researched. To reveal the rule of abnormal heating, we conducted the experiments. Several studies have been conducted on a heating composite insulator serviced in China. Discharge and abnormal heating was observed under different working condition and the insulator was dissected in order to test the electric property. The experiment shows that the change of electric property is of great importance in abnormal heating, which is conductive to the accurate judgement of the interface failure. The abnormal heating phenomenon is in highly relative to the partial discharge in interface of the composite insulator. The electric field distortion, which was caused by electric property change, was the main reason leading to partial discharge.
{"title":"Study on High Temperature Heating Characteristics of Degraded Composite Insulators","authors":"Xiangyang Peng, Zhangxiang Nie, Cuiru Yang, Zhen Huang, Xinyu Huang, Zhonghao Zhang, Liming Wang","doi":"10.1109/CEIDP.2018.8544851","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544851","url":null,"abstract":"Abnormal heating problems caused by interface failure is a common phenomenon in Power System while the mechanism of abnormal heating hasn't been fully researched. To reveal the rule of abnormal heating, we conducted the experiments. Several studies have been conducted on a heating composite insulator serviced in China. Discharge and abnormal heating was observed under different working condition and the insulator was dissected in order to test the electric property. The experiment shows that the change of electric property is of great importance in abnormal heating, which is conductive to the accurate judgement of the interface failure. The abnormal heating phenomenon is in highly relative to the partial discharge in interface of the composite insulator. The electric field distortion, which was caused by electric property change, was the main reason leading to partial discharge.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115608273","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544762
Yinfei Li, Xuebao Li, Qian Zhang, T. Lu
In this paper a DC conductor is set parallel with an AC conductor in the laboratory to study the influence of AC voltage on the characteristics of positive corona current pulse. The corona onset voltage of DC conductor and the detail characteristics of corona current pulses such as the rise time, the amplitude, the pulse width and the repetition frequency are systematically analyzed. It is found that the corona onset voltage of DC conductor decreases linearly with the increase of AC voltage. Due to the influence of AC voltage, the distribution of corona current pulses gradually forms into periodic clusters and the repetition frequency of the clusters is equal to the frequency of AC voltage. Meanwhile, the obtained results show that the average current amplitude decreases with the increase of separation distance, rise time increases with the increase of separation distance and the current width changes uniformly with separation distance. Meanwhile, AC voltage and the separation distance have an influence on the repetition of current pulses. Through the calculation of the average ionization boundary and ionization coefficient integration, the mechanism of the influence of AC voltage and separation distance on the corona of DC conductor is qualitatively analyzed.
{"title":"Experimental Investigation on the Influence of AC Voltage on Positive Corona Current Pulses from DC Conductor Parallel with AC Conductor","authors":"Yinfei Li, Xuebao Li, Qian Zhang, T. Lu","doi":"10.1109/CEIDP.2018.8544762","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544762","url":null,"abstract":"In this paper a DC conductor is set parallel with an AC conductor in the laboratory to study the influence of AC voltage on the characteristics of positive corona current pulse. The corona onset voltage of DC conductor and the detail characteristics of corona current pulses such as the rise time, the amplitude, the pulse width and the repetition frequency are systematically analyzed. It is found that the corona onset voltage of DC conductor decreases linearly with the increase of AC voltage. Due to the influence of AC voltage, the distribution of corona current pulses gradually forms into periodic clusters and the repetition frequency of the clusters is equal to the frequency of AC voltage. Meanwhile, the obtained results show that the average current amplitude decreases with the increase of separation distance, rise time increases with the increase of separation distance and the current width changes uniformly with separation distance. Meanwhile, AC voltage and the separation distance have an influence on the repetition of current pulses. Through the calculation of the average ionization boundary and ionization coefficient integration, the mechanism of the influence of AC voltage and separation distance on the corona of DC conductor is qualitatively analyzed.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125834552","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544883
M. S. A. Khiar, R.C.D. Brown, P. Lewin
This paper presents the characteristics of thin film copper strips due to sulfur corrosion at different temperatures. Thin film copper with a layer thickness of 200 nm was deposited onto a glass substrate using an electron beam evaporator. In order to enhance the adhesion of thin film copper on the glass substrate, titanium with a layer thickness of 5 nm was deposited prior to copper evaporation. Three dibenzyl disulfide (DBDS) concentrations were chosen to simulate the different levels of oil corrosiveness: (1) 100, (2) 250, and (3) 1000 ppm. The thin film copper strips were immersed in the corrosive oil samples and then aged in a forced convection laboratory oven at 120 and 130°C for 25 h. The copper loss due to sulfur corrosion was monitored by measuring the resistance of the thin film copper strips using the 4-wire measurement method. Based on the preliminary results, sulfur corrosion is accelerated by increasing the temperature from 120 to 130°C. The amount of copper losses from the glass substrate caused by the corrosive by-products due to the breakdown of DBDS is more pronounced at higher temperature, as evidenced from the measured resistance values.
{"title":"Effect of Temperature Changes on Tine Film Sacrificial Copper Strips due to Sulfur Corrosion","authors":"M. S. A. Khiar, R.C.D. Brown, P. Lewin","doi":"10.1109/CEIDP.2018.8544883","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544883","url":null,"abstract":"This paper presents the characteristics of thin film copper strips due to sulfur corrosion at different temperatures. Thin film copper with a layer thickness of 200 nm was deposited onto a glass substrate using an electron beam evaporator. In order to enhance the adhesion of thin film copper on the glass substrate, titanium with a layer thickness of 5 nm was deposited prior to copper evaporation. Three dibenzyl disulfide (DBDS) concentrations were chosen to simulate the different levels of oil corrosiveness: (1) 100, (2) 250, and (3) 1000 ppm. The thin film copper strips were immersed in the corrosive oil samples and then aged in a forced convection laboratory oven at 120 and 130°C for 25 h. The copper loss due to sulfur corrosion was monitored by measuring the resistance of the thin film copper strips using the 4-wire measurement method. Based on the preliminary results, sulfur corrosion is accelerated by increasing the temperature from 120 to 130°C. The amount of copper losses from the glass substrate caused by the corrosive by-products due to the breakdown of DBDS is more pronounced at higher temperature, as evidenced from the measured resistance values.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126851422","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544911
M. de Araujo Andrade, R. Candela, L. de Rai, S. F. Bononi, A. Imburgia, E. R. Sanseverino, P. Romano, F. Viola
The aim of the present work is to evaluate the acoustic waves behavior within the Pulsed Electro-Acoustic (PEA) cell, in case of a multilayer specimen, in order to avoid misinterpretation of the output signal. Due to the reflection phenomenon of the acoustic waves travelling within the PEA cell, the output signal could be distorted. Because this aspect, for a given PEA cell with certain ground electrode and absorber thicknesses, depends on the sound velocity and thickness of the specimen under test, the latter must be carefully sized. For this aim, some useful relationships, that must be taken into account are given and described. In particular, a three layers sample simulating an air void defect within an insulating material has been realized, and the space charge pattern has been detailed analyzed. Measurement result, shown that despite the specimen layers thicknesses has been chosen in accordance to the provided relationships, a reflection within the specimen itself overlaps one the main charge peak.
{"title":"Interpretation of PEA Output Signal in a Multilayer Specimen","authors":"M. de Araujo Andrade, R. Candela, L. de Rai, S. F. Bononi, A. Imburgia, E. R. Sanseverino, P. Romano, F. Viola","doi":"10.1109/CEIDP.2018.8544911","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544911","url":null,"abstract":"The aim of the present work is to evaluate the acoustic waves behavior within the Pulsed Electro-Acoustic (PEA) cell, in case of a multilayer specimen, in order to avoid misinterpretation of the output signal. Due to the reflection phenomenon of the acoustic waves travelling within the PEA cell, the output signal could be distorted. Because this aspect, for a given PEA cell with certain ground electrode and absorber thicknesses, depends on the sound velocity and thickness of the specimen under test, the latter must be carefully sized. For this aim, some useful relationships, that must be taken into account are given and described. In particular, a three layers sample simulating an air void defect within an insulating material has been realized, and the space charge pattern has been detailed analyzed. Measurement result, shown that despite the specimen layers thicknesses has been chosen in accordance to the provided relationships, a reflection within the specimen itself overlaps one the main charge peak.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122721565","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544786
Chong Li, Kai Wu, Zhi Li, Yong Yang, Kang Oian, Xiaohua Kang
Chemical indicators were widely used in condition assessment of transformers. Methanol is considered as a better method than furfural to assess the condition of transformer with higher detection rate and thermal stability. However, the effect of electric field on the generation of methanol still needs further investigation. In this report, insulation oil and 5mm-thick cellulose paper were put into aging cell with a weight ratio of 10:1 after degased and dehydration. Aging experiments were carried out at 120°C with and without an electric field of 2kV/mm, respectively. Degree of polymerization, concentration of methanol, furfural and ethanol dissolved in oil were measured after accelerated experiments. The concentration of methanol in oil was much higher than that of furfural at early aging while it increased with aging time. Samples aged under electric field had higher methanol concentration, and the amount of methanol was proportional to the number of scissions of cellulose chain. It was indicated that the electric field accelerated the generation of methanol by aggravating the scission of cellulose chain.
{"title":"Effect of Electric Field on Methanol Generation in Transformer","authors":"Chong Li, Kai Wu, Zhi Li, Yong Yang, Kang Oian, Xiaohua Kang","doi":"10.1109/CEIDP.2018.8544786","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544786","url":null,"abstract":"Chemical indicators were widely used in condition assessment of transformers. Methanol is considered as a better method than furfural to assess the condition of transformer with higher detection rate and thermal stability. However, the effect of electric field on the generation of methanol still needs further investigation. In this report, insulation oil and 5mm-thick cellulose paper were put into aging cell with a weight ratio of 10:1 after degased and dehydration. Aging experiments were carried out at 120°C with and without an electric field of 2kV/mm, respectively. Degree of polymerization, concentration of methanol, furfural and ethanol dissolved in oil were measured after accelerated experiments. The concentration of methanol in oil was much higher than that of furfural at early aging while it increased with aging time. Samples aged under electric field had higher methanol concentration, and the amount of methanol was proportional to the number of scissions of cellulose chain. It was indicated that the electric field accelerated the generation of methanol by aggravating the scission of cellulose chain.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122015334","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544907
Yang Yang, Qi Li, Jinliang He
Utilizing the matrix-filler interface regions to tune the electrical performance of nanodielectrics has been extensively investigated by adding various inorganic (ceramic) nanoparticles into polymers. The organic-inorganic interphase compatibility problems and the lack of functional diversity of ceramic fillers have limited the performance of nanodielectrics. In this research, high porosity mesoporous silica (MS) nanoparticles were used as carriers to introduce organic functional molecules (PEl, PEG, and PEG-COOH) into polymer matrix. The ultra-high specific surface area of MS together with the nucleophilic PEl bring more than 10% enhancement of electrical breakdown strength and improved Ohmic-SCLC transition field to PP.
{"title":"The Dielectric Properties of PP Nanocomposites Doped with Mesoporous Silica Nanoparticles","authors":"Yang Yang, Qi Li, Jinliang He","doi":"10.1109/CEIDP.2018.8544907","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544907","url":null,"abstract":"Utilizing the matrix-filler interface regions to tune the electrical performance of nanodielectrics has been extensively investigated by adding various inorganic (ceramic) nanoparticles into polymers. The organic-inorganic interphase compatibility problems and the lack of functional diversity of ceramic fillers have limited the performance of nanodielectrics. In this research, high porosity mesoporous silica (MS) nanoparticles were used as carriers to introduce organic functional molecules (PEl, PEG, and PEG-COOH) into polymer matrix. The ultra-high specific surface area of MS together with the nucleophilic PEl bring more than 10% enhancement of electrical breakdown strength and improved Ohmic-SCLC transition field to PP.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122059913","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544891
H. Couderc, V. Griseri, É. David, D. Mary
Nanocomposites properties are strongly linked to their micro-structure and the quality of the nanoparticles distribution inside the matrix. A good distribution is reachable at the laboratory scale, as seen in the literature, but is somewhat more challenging to reach at the industrial scale with the usual cost, safety and environmental considerations. The most convenient way to produce thermoplastic based composites at the industrial level is to start from a polymer/filler masterbatch, with an adequate, but certainly not yet optimized, particles distribution, and to improve it by the means of further melt-mixing processing. This study is focused on the properties of LDPE/MgO nanocomposites compounded by the means of different thermo-mixing treatments and the purpose is to establish an appropriate melt-mixing procedure for material development with the desired dielectric properties. Low Density Polyethylene (LDPE) was used as a matrix and was reinforced by Magnesium Oxide (MgO) particles having an average size of 30 nm. The MgO nanoparticles were either treated or untreated with a silane coupling agent (3-Glycidyloxypropyl Trimethoxysilane). The primary samples were prepared in a melt-mixing chamber with a MgO content of 1%wt. Samples with untreated MgO and pure LDPE were also prepared in a similar way for comparison purposes. These pre-mixed samples were further treated by the means of thermo-mixing treatments provided by a conical co-rotating twin-screw extruder allowing optimizing the processing parameters. The sample dispersion was subsequently evaluated by Scanning Electron Microscopy (SEM). ACBD measurements were conducted and the resistance to space charge accumulation under DC fields was evaluated using a PEA setup.
{"title":"Dielectric Properties of LDPE/MgO Nanocomposites Micro-extruded from a Masterbatch","authors":"H. Couderc, V. Griseri, É. David, D. Mary","doi":"10.1109/CEIDP.2018.8544891","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544891","url":null,"abstract":"Nanocomposites properties are strongly linked to their micro-structure and the quality of the nanoparticles distribution inside the matrix. A good distribution is reachable at the laboratory scale, as seen in the literature, but is somewhat more challenging to reach at the industrial scale with the usual cost, safety and environmental considerations. The most convenient way to produce thermoplastic based composites at the industrial level is to start from a polymer/filler masterbatch, with an adequate, but certainly not yet optimized, particles distribution, and to improve it by the means of further melt-mixing processing. This study is focused on the properties of LDPE/MgO nanocomposites compounded by the means of different thermo-mixing treatments and the purpose is to establish an appropriate melt-mixing procedure for material development with the desired dielectric properties. Low Density Polyethylene (LDPE) was used as a matrix and was reinforced by Magnesium Oxide (MgO) particles having an average size of 30 nm. The MgO nanoparticles were either treated or untreated with a silane coupling agent (3-Glycidyloxypropyl Trimethoxysilane). The primary samples were prepared in a melt-mixing chamber with a MgO content of 1%wt. Samples with untreated MgO and pure LDPE were also prepared in a similar way for comparison purposes. These pre-mixed samples were further treated by the means of thermo-mixing treatments provided by a conical co-rotating twin-screw extruder allowing optimizing the processing parameters. The sample dispersion was subsequently evaluated by Scanning Electron Microscopy (SEM). ACBD measurements were conducted and the resistance to space charge accumulation under DC fields was evaluated using a PEA setup.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129922238","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544877
O. Lesaint, N. Bonifaci, H. Merini, R. Maladen, F. Gentils
The dielectric properties of the hydro-fluoro-olefin gas HFO1234ze(E) are studied by the measurement of breakdown voltage versus pressure in two typical conditions: with uniform electric field under high voltage DC ramp, and with non-uniform electric field under impulse voltage. Solid by-products are generated during breakdown experiments, taking the form of black dust. These by-products do not produce an appreciable decrease of breakdown voltage of the gas. In uniform field, HFO shows a breakdown voltage about 83% that of SF6 in identical conditions. In divergent field, increasing the pressure induces a moderate increase of the impulse breakdown voltage. HFO shows favorable properties in the view to replacing SF6 for the insulation of medium voltage systems.
{"title":"A Study of Breakdown Properties of HFO Gas under DC and Impulse Voltage","authors":"O. Lesaint, N. Bonifaci, H. Merini, R. Maladen, F. Gentils","doi":"10.1109/CEIDP.2018.8544877","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544877","url":null,"abstract":"The dielectric properties of the hydro-fluoro-olefin gas HFO1234ze(E) are studied by the measurement of breakdown voltage versus pressure in two typical conditions: with uniform electric field under high voltage DC ramp, and with non-uniform electric field under impulse voltage. Solid by-products are generated during breakdown experiments, taking the form of black dust. These by-products do not produce an appreciable decrease of breakdown voltage of the gas. In uniform field, HFO shows a breakdown voltage about 83% that of SF6 in identical conditions. In divergent field, increasing the pressure induces a moderate increase of the impulse breakdown voltage. HFO shows favorable properties in the view to replacing SF6 for the insulation of medium voltage systems.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128644831","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544880
W. Chao, Yuncai Lu, Zhou Jiang, Yuan Yuan, Jiang Youdong
In the operation of transformer, most copper winding is in bending state, and bending stress was a factor which could certainly influence the corrosion of copper winding. In this paper, copper winding was firstly bent with different angles. Then, the corrosion behaviors of the copper samples have been investigated in mineral oil containing various concentration of corrosive sulfur. The results show that bending stress did influence the sulfur corrosion. It will accelerate corrosion of copper winding. Moreover, the properties of insulating oil could be seriously affected. With the increasing of the bending angles, the copper presented increasing dielectric loss and reducing breakdown voltage.
{"title":"The Influence of Bending Stress on the Sulfur Corrosion of Copper Winding","authors":"W. Chao, Yuncai Lu, Zhou Jiang, Yuan Yuan, Jiang Youdong","doi":"10.1109/CEIDP.2018.8544880","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544880","url":null,"abstract":"In the operation of transformer, most copper winding is in bending state, and bending stress was a factor which could certainly influence the corrosion of copper winding. In this paper, copper winding was firstly bent with different angles. Then, the corrosion behaviors of the copper samples have been investigated in mineral oil containing various concentration of corrosive sulfur. The results show that bending stress did influence the sulfur corrosion. It will accelerate corrosion of copper winding. Moreover, the properties of insulating oil could be seriously affected. With the increasing of the bending angles, the copper presented increasing dielectric loss and reducing breakdown voltage.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128658753","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 : 2018-10-01DOI: 10.1109/CEIDP.2018.8544761
Shaohua Li, Xidong Liang, A. Prasad, L. Schadler, J. K. Nelson, Yanfeng Gao
To understand the influence of nanofillers on the dielectric spectra of nanocomposites, this paper examines the low frequency dielectric responses for silicone/ZrO2nanocomposites with different filler loadings. The ZrO2 nanoparticles were grafted with 1k and 10k molecular weight polydimethylsiloxane (PDMS) in order to achieve good dispersion in the PDMS matrix. The relative permittivity at infinite frequency and dc conductance were calculated through Kramers-Kronig relations and successfully differentiated from the measured spectra. The influence of temperature and filler loading on these two parameters and the shape of dielectric spectra is discussed.
{"title":"Low Frequency Dielectric Response of Silicone/ZrO2 Nanocomposites","authors":"Shaohua Li, Xidong Liang, A. Prasad, L. Schadler, J. K. Nelson, Yanfeng Gao","doi":"10.1109/CEIDP.2018.8544761","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544761","url":null,"abstract":"To understand the influence of nanofillers on the dielectric spectra of nanocomposites, this paper examines the low frequency dielectric responses for silicone/ZrO2nanocomposites with different filler loadings. The ZrO2 nanoparticles were grafted with 1k and 10k molecular weight polydimethylsiloxane (PDMS) in order to achieve good dispersion in the PDMS matrix. The relative permittivity at infinite frequency and dc conductance were calculated through Kramers-Kronig relations and successfully differentiated from the measured spectra. The influence of temperature and filler loading on these two parameters and the shape of dielectric spectra is discussed.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129446416","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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