Pub Date : 2020-07-05DOI: 10.1109/ICD46958.2020.9341817
S. Riarh, O. Vryonis, A. Vaughan
Particle tethering with the matrix permits property manipulation depending on the respective architecture and chemistry. However, integration of highly reactive moieties into epoxy networks may detrimentally affect the reaction stoichiometry. In this study, octa glycidyl polyhedral oligomeric silsesquioxane (OG POSS) was incorporated into an epoxy matrix (a) by considering it as a co-monomer (requiring stoichiometric compensation) and (b) by considering it as a silica-based filler (simple addition without compensation). The simple addition of OG POSS resulted in a considerable glass transition temperature (Tg) decrease due to impaired stoichiometry, while the stoichiometric addition moderated this effect. These results, supported by the dielectric data, demonstrate that OG POSS is better considered as a co-monomer.
{"title":"Octa-functional POSS: An Epoxy Filler or Co-monomer?","authors":"S. Riarh, O. Vryonis, A. Vaughan","doi":"10.1109/ICD46958.2020.9341817","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341817","url":null,"abstract":"Particle tethering with the matrix permits property manipulation depending on the respective architecture and chemistry. However, integration of highly reactive moieties into epoxy networks may detrimentally affect the reaction stoichiometry. In this study, octa glycidyl polyhedral oligomeric silsesquioxane (OG POSS) was incorporated into an epoxy matrix (a) by considering it as a co-monomer (requiring stoichiometric compensation) and (b) by considering it as a silica-based filler (simple addition without compensation). The simple addition of OG POSS resulted in a considerable glass transition temperature (Tg) decrease due to impaired stoichiometry, while the stoichiometric addition moderated this effect. These results, supported by the dielectric data, demonstrate that OG POSS is better considered as a co-monomer.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"43 1","pages":"594-597"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86331879","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9342017
M.Y. Wang, B. Du, X.T. Han, Z.X. Liu, Y. Li, Y. Zhang, Jin Li, Z.L. Li, C. Han, Z. Hou
Polypropylene laminated paper (PPLP) and liquid nitrogen (LN2) is widely used as insulation and coolant, respectively, in high-temperature superconducting (HTS) cable. Dielectric loss of PPLP plays an important role in the loss of HTS transmission system. In this paper, polytetrafluoroethylene (PTFE) filter papers were chosen to take place of Kraft paper (KP) in composite insulation system. Two layers of PTFE filter paper and one layer of polypropylene (PP) film were processed into sandwich structure through hot-press method. Experimental results show that the dielectric loss can be cut to half by replacing KP with PTFE filter in AC HTS transmission system. The trap level of PTFE/PP composite insulation is shallower. The surface discharge voltage of PTFE/PP is higher than that of PPLP. PTFE/PP also has stronger ability of resisting partial discharge and shows higher partial discharge inception voltage than PPLP does. And the breakdown voltage of PTFE/PP composite insulation is higher than that of PPLP, which mainly due to the stronger resistance to discharge.
{"title":"Dielectric and Electrical Insulation Properties of PTFE/PP for HTS Power Apparatus Application","authors":"M.Y. Wang, B. Du, X.T. Han, Z.X. Liu, Y. Li, Y. Zhang, Jin Li, Z.L. Li, C. Han, Z. Hou","doi":"10.1109/ICD46958.2020.9342017","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342017","url":null,"abstract":"Polypropylene laminated paper (PPLP) and liquid nitrogen (LN2) is widely used as insulation and coolant, respectively, in high-temperature superconducting (HTS) cable. Dielectric loss of PPLP plays an important role in the loss of HTS transmission system. In this paper, polytetrafluoroethylene (PTFE) filter papers were chosen to take place of Kraft paper (KP) in composite insulation system. Two layers of PTFE filter paper and one layer of polypropylene (PP) film were processed into sandwich structure through hot-press method. Experimental results show that the dielectric loss can be cut to half by replacing KP with PTFE filter in AC HTS transmission system. The trap level of PTFE/PP composite insulation is shallower. The surface discharge voltage of PTFE/PP is higher than that of PPLP. PTFE/PP also has stronger ability of resisting partial discharge and shows higher partial discharge inception voltage than PPLP does. And the breakdown voltage of PTFE/PP composite insulation is higher than that of PPLP, which mainly due to the stronger resistance to discharge.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"52 1","pages":"621-624"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83957495","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341866
Zhaozi Zhang, Bingchen Song, Yongjie Nie, D. Min, Shengtao Li, Chuanchuan Wang, Tao Zhao
With the development of high voltage transmission, higher voltage is necessary. Power equipment with traditional materials can not satisfy the insulation requirement of higher voltage transmission, so excellent material is urgently needed. PTFE nozzle is important in circuit breaker which faces the problem of arc ablation, and the nozzle with better performance is helpful to improve the transmission voltage. In this paper, in order to study the influence of different pressing pressures and modes on the ablation performance of PTFE/BN composites, four pressures and two modes were adopted (cold isostatic pressing and mould pressing) to obtain 7-wt% BN doped PTFE composites. As the pressing pressure increases, the ablation amount of the specimen decreases gradually. Compared with mould pressing, the specimen prepared by cold isostatic pressing has a higher thermal conductivity and lower ablation amount, while the light reflection properties are almost the same for both preparing methods. This paper is of great significance to improve the ablation resistance of nozzle materials.
{"title":"Effect of Pressing Mode and Pressure on Arc Ablation Performance of PTFE/BN Composites","authors":"Zhaozi Zhang, Bingchen Song, Yongjie Nie, D. Min, Shengtao Li, Chuanchuan Wang, Tao Zhao","doi":"10.1109/ICD46958.2020.9341866","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341866","url":null,"abstract":"With the development of high voltage transmission, higher voltage is necessary. Power equipment with traditional materials can not satisfy the insulation requirement of higher voltage transmission, so excellent material is urgently needed. PTFE nozzle is important in circuit breaker which faces the problem of arc ablation, and the nozzle with better performance is helpful to improve the transmission voltage. In this paper, in order to study the influence of different pressing pressures and modes on the ablation performance of PTFE/BN composites, four pressures and two modes were adopted (cold isostatic pressing and mould pressing) to obtain 7-wt% BN doped PTFE composites. As the pressing pressure increases, the ablation amount of the specimen decreases gradually. Compared with mould pressing, the specimen prepared by cold isostatic pressing has a higher thermal conductivity and lower ablation amount, while the light reflection properties are almost the same for both preparing methods. This paper is of great significance to improve the ablation resistance of nozzle materials.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"38 1","pages":"146-149"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82725367","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9342020
D. Bouguedad, A. Mekhaldi, O. Jbara, S. Rondot, A. Hadjadj, P. Dony
In this work, ethylene propylene diene monomer (EPDM) used in power cables insulation was exposed to a thermal aging at different temperatures ranging from $80^{circ}C$ to $140^{circ}C$. Two complementary characterization techniques were used to track changes in EPDM crystalline structure during thermal aging. Differential scanning calorimetry (DSC) analysis was performed to measure the variation of the melting enthalpy $Delta H_{m}$. To highlight the modifications induced on the crystalline and amorphous fractions of the EPDM structure, we carried out X-ray diffraction (XRD) measurements. The results of both methods agree in the time and temperature dependence of the aging process. The results show that the crystallinity is improved when aging is carried out at a low temperature. When temperature increases, minor changes in the crystallinity occur at the end of the aging process. At the highest aging temperature, a drop in the crystallinity occurs from the first hours of aging, indicating a degradation of the molecular structure of the polymer.
{"title":"Influence of Thermal Aging on the Crystallinity of EPDM Used in Power Cables Insulation","authors":"D. Bouguedad, A. Mekhaldi, O. Jbara, S. Rondot, A. Hadjadj, P. Dony","doi":"10.1109/ICD46958.2020.9342020","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342020","url":null,"abstract":"In this work, ethylene propylene diene monomer (EPDM) used in power cables insulation was exposed to a thermal aging at different temperatures ranging from $80^{circ}C$ to $140^{circ}C$. Two complementary characterization techniques were used to track changes in EPDM crystalline structure during thermal aging. Differential scanning calorimetry (DSC) analysis was performed to measure the variation of the melting enthalpy $Delta H_{m}$. To highlight the modifications induced on the crystalline and amorphous fractions of the EPDM structure, we carried out X-ray diffraction (XRD) measurements. The results of both methods agree in the time and temperature dependence of the aging process. The results show that the crystallinity is improved when aging is carried out at a low temperature. When temperature increases, minor changes in the crystallinity occur at the end of the aging process. At the highest aging temperature, a drop in the crystallinity occurs from the first hours of aging, indicating a degradation of the molecular structure of the polymer.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"12 1","pages":"586-589"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90342208","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9342007
K. Chen, Z. An, W. Huang, X. Wang, F. Zheng, Y. Zhang
Our previous results have shown that surface hydrophobicity of a high temperature vulcanized silicone rubber can be significantly enhanced by direct fluorination. In this report, the surface fluorinated sample together with the virgin sample as a reference have been investigated on their water vapor barrier properties at $30^{circ}C$ or $60^{circ}C$ in a humidity environment of 75% or 97% RH. The experimental results show that the fluorinated surface layer has a high barrier to water vapor ingress into the interior of the SIR, so that the surface fluorinated sample has a much lower absorption of moisture in comparison with the virgin sample under the same conditions. SEM images show that the fluorination leads to the formation of a fluorinated surface layer with a thickness of 0.56 $mu m$ and a nanostructured surface. The improvement of the barrier properties is attributed to a decrease in free volume of the surface layer as well as the increase in surface hydrophobicity by the fluorination, as indicated by contact angle measurements and ATR-IR and XPS analyses.
{"title":"Improved Moisture Barrier Properties of High Temperature Vulcanized Silicone Rubber by Direct Fluorination","authors":"K. Chen, Z. An, W. Huang, X. Wang, F. Zheng, Y. Zhang","doi":"10.1109/ICD46958.2020.9342007","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342007","url":null,"abstract":"Our previous results have shown that surface hydrophobicity of a high temperature vulcanized silicone rubber can be significantly enhanced by direct fluorination. In this report, the surface fluorinated sample together with the virgin sample as a reference have been investigated on their water vapor barrier properties at $30^{circ}C$ or $60^{circ}C$ in a humidity environment of 75% or 97% RH. The experimental results show that the fluorinated surface layer has a high barrier to water vapor ingress into the interior of the SIR, so that the surface fluorinated sample has a much lower absorption of moisture in comparison with the virgin sample under the same conditions. SEM images show that the fluorination leads to the formation of a fluorinated surface layer with a thickness of 0.56 $mu m$ and a nanostructured surface. The improvement of the barrier properties is attributed to a decrease in free volume of the surface layer as well as the increase in surface hydrophobicity by the fluorination, as indicated by contact angle measurements and ATR-IR and XPS analyses.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"15 1","pages":"566-569"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88834447","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341968
Haoming Xu, Wenfeng Liu, Zhen Li, Farooq Aslam, Shengtao Li
Surface flashover and breakdown are two typical failures of insulations, which inhibit the stability and downsizing of electrical apparatus. The two phenomena were traditional considered be affected by different factors. However, in the present study, the inherent correlation between surface flashover and gas breakdown strength was revealed. Experimentally epoxy resin composites with a thickness of 1 mm and diameter of 50 mm were prepared. Surface flashover voltages were measured for DC voltage in different pressure and temperature. Gas breakdown voltages were tested in a same condition. With temperature decreases or pressure increases, both gas breakdown voltage and surface flashover voltage increase. However, the growth rate is different for the two voltages. Gas breakdown voltage increases faster than surface flashover voltage. The ratio of flashover voltage to gas breakdown voltage decrease with gas pressure increase. This work investigates the relationship between surface flashover and gas breakdown by considering gas adsorption. It was found that sample gas adsorption capacity can affect the surface flashover voltage, but a saturation point exists. When the adsorbed gas molecules of samples reach saturation, the effect of adsorption on surface flashover performance is less than the effect of pressure on gas breakdown voltage.
{"title":"Inherent Correlation Between the Breakdown Strength and the Surface Flashover Performance of Epoxy Resin in N2 Atmosphere","authors":"Haoming Xu, Wenfeng Liu, Zhen Li, Farooq Aslam, Shengtao Li","doi":"10.1109/ICD46958.2020.9341968","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341968","url":null,"abstract":"Surface flashover and breakdown are two typical failures of insulations, which inhibit the stability and downsizing of electrical apparatus. The two phenomena were traditional considered be affected by different factors. However, in the present study, the inherent correlation between surface flashover and gas breakdown strength was revealed. Experimentally epoxy resin composites with a thickness of 1 mm and diameter of 50 mm were prepared. Surface flashover voltages were measured for DC voltage in different pressure and temperature. Gas breakdown voltages were tested in a same condition. With temperature decreases or pressure increases, both gas breakdown voltage and surface flashover voltage increase. However, the growth rate is different for the two voltages. Gas breakdown voltage increases faster than surface flashover voltage. The ratio of flashover voltage to gas breakdown voltage decrease with gas pressure increase. This work investigates the relationship between surface flashover and gas breakdown by considering gas adsorption. It was found that sample gas adsorption capacity can affect the surface flashover voltage, but a saturation point exists. When the adsorbed gas molecules of samples reach saturation, the effect of adsorption on surface flashover performance is less than the effect of pressure on gas breakdown voltage.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"13 11","pages":"794-797"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91405823","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341884
Hongbao Zong, Yong Liu, Cheng Zhao
With the high-speed development of urban power system in China, the application of single-core cables in urban transmission and distribution grids is more and more extensive. Excessive circulating currents, generated on the metal sheath of single-core high-voltage cable, bring massive loss which will reduce cable transmission efficiency and safe operating lifetime. In this paper, the cable with cross-bonding mode was established based on ATP-EMTP. Through the simulation analysis, the relationships between the circulating current and the arrangement, segment and core current were obtained. The variations of circulating current and sheath voltage in case of the cable faults (short circuit, open circuit, commutation failure) were discussed. And the suppressing methods by using the series resistance, inductance and impedance were proposed to restrain the circulating currents. The results obtained show that the circulating currents are linearly related to the section length, arrangement and core current, which change significantly in case of short circuit, open circuit and commutation failure. The series resistance and inductance have effective suppressing effects not only on the steady state circulating currents but also on the transient circulating currents. The series inductance can make the circulating currents change smoothly
{"title":"Analysis of Suppressing Methods and Influencing Factors of High Voltage Cable Circulating Current Based on ATP-EMTP","authors":"Hongbao Zong, Yong Liu, Cheng Zhao","doi":"10.1109/ICD46958.2020.9341884","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341884","url":null,"abstract":"With the high-speed development of urban power system in China, the application of single-core cables in urban transmission and distribution grids is more and more extensive. Excessive circulating currents, generated on the metal sheath of single-core high-voltage cable, bring massive loss which will reduce cable transmission efficiency and safe operating lifetime. In this paper, the cable with cross-bonding mode was established based on ATP-EMTP. Through the simulation analysis, the relationships between the circulating current and the arrangement, segment and core current were obtained. The variations of circulating current and sheath voltage in case of the cable faults (short circuit, open circuit, commutation failure) were discussed. And the suppressing methods by using the series resistance, inductance and impedance were proposed to restrain the circulating currents. The results obtained show that the circulating currents are linearly related to the section length, arrangement and core current, which change significantly in case of short circuit, open circuit and commutation failure. The series resistance and inductance have effective suppressing effects not only on the steady state circulating currents but also on the transient circulating currents. The series inductance can make the circulating currents change smoothly","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"2018 1","pages":"633-636"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86800110","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341829
Z. Hou, B. Du, Z. L. Li, Jin Li, C. Han, R. Xu, M. Y. Wang, C. Liu
Space charge and breakdown behavior are important factors in the design of high voltage dc (HVDC) cables. Since the working temperature together with additives has a great influence on the insulation performance of the composites, the temperature effect investigation would be highly beneficial. In this paper, the space charge test of the polypropylene (PP) /ultralow density polyethylene (ULDPE) blends and its radical scavenger modified composites are performed at 30, 60 and 90 °C, respectively. The trap distribution in the radical scavenger and the composites are investigated based on Quantum chemistry calculation and isothermal discharge current (IDC) test. The radical scavenger can introduce traps with different energy levels, which has greatly inhibited the space charge accumulation aggravated by the increasing temperature in the PP/ULDPE (PU) blends. The PP/ULDPE blends with 0.3 wt% radical scavenger exhibit great space charge performance for HVDC cable insulation.
{"title":"Trap Distribution and Space Charge Behavior of PP/ULDPE/ Radical Scavenger Composites for HVDC Cable Insulation","authors":"Z. Hou, B. Du, Z. L. Li, Jin Li, C. Han, R. Xu, M. Y. Wang, C. Liu","doi":"10.1109/ICD46958.2020.9341829","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341829","url":null,"abstract":"Space charge and breakdown behavior are important factors in the design of high voltage dc (HVDC) cables. Since the working temperature together with additives has a great influence on the insulation performance of the composites, the temperature effect investigation would be highly beneficial. In this paper, the space charge test of the polypropylene (PP) /ultralow density polyethylene (ULDPE) blends and its radical scavenger modified composites are performed at 30, 60 and 90 °C, respectively. The trap distribution in the radical scavenger and the composites are investigated based on Quantum chemistry calculation and isothermal discharge current (IDC) test. The radical scavenger can introduce traps with different energy levels, which has greatly inhibited the space charge accumulation aggravated by the increasing temperature in the PP/ULDPE (PU) blends. The PP/ULDPE blends with 0.3 wt% radical scavenger exhibit great space charge performance for HVDC cable insulation.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"71 1","pages":"338-341"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85160317","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341911
Takuto Kobayashi, T. Shioiri, S. Matsuoka, A. Kumada, K. Hidaka
In these days, a large number of offshore wind-farms projects are planned. For power delivery from such an offshore wind-farm with large amounts of energy, a gas-insulated transmission line (GIL) is expected to offer a solution owing to its low capacitance. In this paper, a test model of 22 kV-class flexible GIL (FGIL) system is designed, which has the same or more flexibility as a cable system has. In this article, we propose a FGIL utilizing atmospheric pressure CF3 I gas, which is one of SF6 alternatives, as insulating medium. Its feasibility is evaluated from the viewpoint of withstand voltage.
{"title":"Feasibility study of flexible gas-insulated transmission line using CF3I gas mixture","authors":"Takuto Kobayashi, T. Shioiri, S. Matsuoka, A. Kumada, K. Hidaka","doi":"10.1109/ICD46958.2020.9341911","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341911","url":null,"abstract":"In these days, a large number of offshore wind-farms projects are planned. For power delivery from such an offshore wind-farm with large amounts of energy, a gas-insulated transmission line (GIL) is expected to offer a solution owing to its low capacitance. In this paper, a test model of 22 kV-class flexible GIL (FGIL) system is designed, which has the same or more flexibility as a cable system has. In this article, we propose a FGIL utilizing atmospheric pressure CF3 I gas, which is one of SF6 alternatives, as insulating medium. Its feasibility is evaluated from the viewpoint of withstand voltage.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"33 1","pages":"806-809"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91124717","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341877
P. Livesey, A. Gyore, James Reid
The liquid specific moisture saturation coefficients A and B are required for accurate use of thin film capacitance moisture sensors. These have been previously produced and evaluated for new liquids including synthetic and natural esters. In-use synthetic and natural esters have not yet been evaluated. This paper aims to demonstrate the difference in results of aged esters compared to new, as well as demonstrating the effect on results which can be caused by using improper methods in these liquids. The results highlight the importance of using liquids with high enough initial moisture content and also demonstrate that the moisture saturation curve is mostly unchanged by changing the temperatures used in calculation. The results also show that ageing the synthetic ester in different ways did not significantly affect the moisture saturation curve, however ageing the natural ester open to air led to an increase in measured saturation limit at all temperatures when it was heavily oxidised. It is hypothesised that this is due to the presence of oxidation products other than acid in the natural ester.
{"title":"Effect of liquid condition on moisture saturation coefficients in synthetic and natural esters","authors":"P. Livesey, A. Gyore, James Reid","doi":"10.1109/ICD46958.2020.9341877","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341877","url":null,"abstract":"The liquid specific moisture saturation coefficients A and B are required for accurate use of thin film capacitance moisture sensors. These have been previously produced and evaluated for new liquids including synthetic and natural esters. In-use synthetic and natural esters have not yet been evaluated. This paper aims to demonstrate the difference in results of aged esters compared to new, as well as demonstrating the effect on results which can be caused by using improper methods in these liquids. The results highlight the importance of using liquids with high enough initial moisture content and also demonstrate that the moisture saturation curve is mostly unchanged by changing the temperatures used in calculation. The results also show that ageing the synthetic ester in different ways did not significantly affect the moisture saturation curve, however ageing the natural ester open to air led to an increase in measured saturation limit at all temperatures when it was heavily oxidised. It is hypothesised that this is due to the presence of oxidation products other than acid in the natural ester.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"38 1","pages":"728-731"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75406834","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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