Pub Date : 2020-07-05DOI: 10.1109/ICD46958.2020.9341807
Jinjing Peng, Yu Gao, Jing Li, Xuri Xu, Zheng Song, B. Du
Polypropylene (PP) has been considered as a promising insulation material for power cable in both AC and DC systems because of its excellent insulation performance and recyclability. The exposure to partial discharge gives rise to the deterioration of the material that threatens the safe operation of cable. Therefore, it is of great significance to understand the mechanism of partial discharge of PP and its blends subjected to AC voltage. In this work, PP/elastomer blends with thickness of $150 mu mathrm{m}$ were prepared as samples. A needle-plane electrode system was employed to introduce partial discharge by applying an AC voltage with 5 kVrms for 2 hours. The erosion behavior was characterized through multi-sensors system, including high frequency current transformer (HFCT), optical recorder and gas sensor. To better understand the erosion mechanism, isothermal surface potential decay (ISPD) method was used to analyze trap characteristics. The results showed that the trap center became shallower with the increase of elastomer content for both ethylene-octene copolymer elastomer (EOC) and polypropylene based elastomer (PBE). Compared with pure PP, the addition of elastomer improved the resistance of partial discharge and PP with 20 wt% loading percent of EOC presented better resistance to partial discharge compared with PP with 20 wt% loading percent of PBE.
聚丙烯(PP)由于其优良的绝缘性能和可回收性，被认为是一种很有前途的交、直流电力电缆绝缘材料。暴露在局部放电环境下会导致材料劣化，威胁电缆的安全运行。因此，了解PP及其共混物在交流电压作用下局部放电的机理具有重要意义。本研究制备了厚度为$150 mu mathm {m}$的PP/弹性体共混物作为样品。采用针平面电极系统，施加5 kVrms交流电压2小时，引起局部放电。利用高频电流互感器(HFCT)、光学记录仪和气体传感器等多传感器系统对腐蚀行为进行了表征。为了更好地了解侵蚀机理，采用等温表面电位衰减(ISPD)方法分析了陷阱特征。结果表明，随着弹性体含量的增加，乙烯-辛烯共聚物弹性体(EOC)和聚丙烯基弹性体(PBE)的陷阱中心变浅;与纯PP相比，弹性体的加入提高了PP的局部放电性能，而含20%重量% EOC的PP比含20%重量% PBE的PP具有更好的局部放电性能。
{"title":"Partial Discharge Erosion of Polypropylene/Elastomer Blends Characterized with Multi-Sensors under AC Voltage","authors":"Jinjing Peng, Yu Gao, Jing Li, Xuri Xu, Zheng Song, B. Du","doi":"10.1109/ICD46958.2020.9341807","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341807","url":null,"abstract":"Polypropylene (PP) has been considered as a promising insulation material for power cable in both AC and DC systems because of its excellent insulation performance and recyclability. The exposure to partial discharge gives rise to the deterioration of the material that threatens the safe operation of cable. Therefore, it is of great significance to understand the mechanism of partial discharge of PP and its blends subjected to AC voltage. In this work, PP/elastomer blends with thickness of $150 mu mathrm{m}$ were prepared as samples. A needle-plane electrode system was employed to introduce partial discharge by applying an AC voltage with 5 kVrms for 2 hours. The erosion behavior was characterized through multi-sensors system, including high frequency current transformer (HFCT), optical recorder and gas sensor. To better understand the erosion mechanism, isothermal surface potential decay (ISPD) method was used to analyze trap characteristics. The results showed that the trap center became shallower with the increase of elastomer content for both ethylene-octene copolymer elastomer (EOC) and polypropylene based elastomer (PBE). Compared with pure PP, the addition of elastomer improved the resistance of partial discharge and PP with 20 wt% loading percent of EOC presented better resistance to partial discharge compared with PP with 20 wt% loading percent of PBE.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"95 1","pages":"890-893"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85723348","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/ICD46958.2020.9341999
B. Du, Y. Li, M.Y. Wang, Z.X. Liu, X.T. Han, Y. Zhang, Jin Li, Z.L. Li, H.L. Sun
Polyimide (PI) film is widely used as insulation material in superconducting magnet systems. While operating, the PI film is subjected to the interaction of electric and magnetic fields. The existence of magnetic field will affect charge behaviors leading to the changes in flashover voltage. In this paper, a steady magnetic field up to 1.2 T was applied to the PI films. The flashover voltages were investigated under DC condition and AC condition. Different angles between magnetic and electric fields were set to explore the influence of magnetic field direction on the flashover voltage of PI film. Experimental results show that the $Etimes B$ drifting into the surface will block the secondary electron emission, resulting in an increase in the flashover voltage. When the $Etimes B$ drifts out of the surface the result is just the opposite. The promoting effect of magnetic field on the changes of flashover voltage is weakened under the AC condition, while the suppressive effect is strengthened. The failure mechanism of PI film under strong magnetic field will provide a theoretical basis for improving the insulation reliability of superconducting magnets.
{"title":"Effects of Magnetic Field on Surface Flashover of Polyimide Film for Superconducting Magnet Insulation","authors":"B. Du, Y. Li, M.Y. Wang, Z.X. Liu, X.T. Han, Y. Zhang, Jin Li, Z.L. Li, H.L. Sun","doi":"10.1109/ICD46958.2020.9341999","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341999","url":null,"abstract":"Polyimide (PI) film is widely used as insulation material in superconducting magnet systems. While operating, the PI film is subjected to the interaction of electric and magnetic fields. The existence of magnetic field will affect charge behaviors leading to the changes in flashover voltage. In this paper, a steady magnetic field up to 1.2 T was applied to the PI films. The flashover voltages were investigated under DC condition and AC condition. Different angles between magnetic and electric fields were set to explore the influence of magnetic field direction on the flashover voltage of PI film. Experimental results show that the $Etimes B$ drifting into the surface will block the secondary electron emission, resulting in an increase in the flashover voltage. When the $Etimes B$ drifts out of the surface the result is just the opposite. The promoting effect of magnetic field on the changes of flashover voltage is weakened under the AC condition, while the suppressive effect is strengthened. The failure mechanism of PI film under strong magnetic field will provide a theoretical basis for improving the insulation reliability of superconducting magnets.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"88 1","pages":"97-100"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79887668","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/ICD46958.2020.9341894
S. V. Suraci, D. Fabiani
In this article, the evaluation of the electrical and mechanical properties of short XLPE cables subjected to radio-chemical aging is reported. From these results, an initial multi-physics life modelling approach is presented. In particular, the proposed modelling of the electrical properties (here complex permittivity) showed to successfully assess of the health of the cables through non-destructive techniques putting the basis of a diagnostic method for cable management on site.
{"title":"Life modeling analysis of Silane crosslinked polyethylene cables for nuclear applications","authors":"S. V. Suraci, D. Fabiani","doi":"10.1109/ICD46958.2020.9341894","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341894","url":null,"abstract":"In this article, the evaluation of the electrical and mechanical properties of short XLPE cables subjected to radio-chemical aging is reported. From these results, an initial multi-physics life modelling approach is presented. In particular, the proposed modelling of the electrical properties (here complex permittivity) showed to successfully assess of the health of the cables through non-destructive techniques putting the basis of a diagnostic method for cable management on site.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"15 1","pages":"61-64"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84129496","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/ICD46958.2020.9341874
T. Aakre, E. Ildstad
Condition assessment of generators is today performed at various voltage frequencies and test temperatures. The main purpose of this paper is to compare measured PD results from sections of generator bars with that of similar tests performed on laboratory made test objects with void enclosures of known geometry. The test objects were subjected to ac voltage in the frequency range from 0.1 to 300 Hz, increasing in steps up to a maximum of 10 kV. The measured values of partial discharge inception voltages (PDIV), apparent charge magnitude and number of PDs were compared to estimated values in the temperature range of 20° to $155^{circ}mathrm{C}$ using an impedance abcmodel, including both conduction and dielectric response. It was found that the capacitive abc-model sufficiently accurately describes the observed PDIV values at temperatures below $100^{circ}mathrm{C}$ and test frequencies below 50 Hz. At temperatures higher temperatures the measured PDIV values were found to decrease with increasing temperature, particularly so at the lowest test frequencies. This is in agreement with the assumption of increased conductivity and higher rate of polarization at increased temperatures. The high number of low magnitude PDs, strongly indicating that several discharges are needed for a complete discharge of a void surface.
{"title":"PD-Activity in Generator Stator Bar insulation versus Voltage Frequency and Temperature","authors":"T. Aakre, E. Ildstad","doi":"10.1109/ICD46958.2020.9341874","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341874","url":null,"abstract":"Condition assessment of generators is today performed at various voltage frequencies and test temperatures. The main purpose of this paper is to compare measured PD results from sections of generator bars with that of similar tests performed on laboratory made test objects with void enclosures of known geometry. The test objects were subjected to ac voltage in the frequency range from 0.1 to 300 Hz, increasing in steps up to a maximum of 10 kV. The measured values of partial discharge inception voltages (PDIV), apparent charge magnitude and number of PDs were compared to estimated values in the temperature range of 20° to $155^{circ}mathrm{C}$ using an impedance abcmodel, including both conduction and dielectric response. It was found that the capacitive abc-model sufficiently accurately describes the observed PDIV values at temperatures below $100^{circ}mathrm{C}$ and test frequencies below 50 Hz. At temperatures higher temperatures the measured PDIV values were found to decrease with increasing temperature, particularly so at the lowest test frequencies. This is in agreement with the assumption of increased conductivity and higher rate of polarization at increased temperatures. The high number of low magnitude PDs, strongly indicating that several discharges are needed for a complete discharge of a void surface.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"1 1","pages":"870-873"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83561522","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/ICD46958.2020.9341837
Z. Zhang, Youyuan Wang, Xiaosong Zhu, Yudong Li, Hongrui Gu
The development of self-healing electrostrictive materials is helpful to improve the life of flexible electronic devices. In this paper, a polar elastomer-modified dielectric elastomer has achieved self-healing of shear damage at room temperature. The MG-SBS material was obtained by grafting methyl methyl thioglycolate (MG) onto styrene-butadiene- styrene (SBS) block copolymer by click chemical reaction. Tensile testing, mechanical dynamic thermal analysis, and broadband dielectric spectroscopy were used to analyze the performance of MG-SBS. Studies have shown that the CH/$pi$ bond enables MG-SBS materials to achieve self-healing of shear damage. MG-SBS is close to the electrostrictive properties of acrylic at lower temperature. The temperature stability of the electrostrictive performance is its unique advantage. The material will help improve the damage self-healing ability and temperature adaptability of flexible electronic devices.
{"title":"Preparation and Electromechanical Performance Analysis of Self-healing Electrostrictive Polymer","authors":"Z. Zhang, Youyuan Wang, Xiaosong Zhu, Yudong Li, Hongrui Gu","doi":"10.1109/ICD46958.2020.9341837","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341837","url":null,"abstract":"The development of self-healing electrostrictive materials is helpful to improve the life of flexible electronic devices. In this paper, a polar elastomer-modified dielectric elastomer has achieved self-healing of shear damage at room temperature. The MG-SBS material was obtained by grafting methyl methyl thioglycolate (MG) onto styrene-butadiene- styrene (SBS) block copolymer by click chemical reaction. Tensile testing, mechanical dynamic thermal analysis, and broadband dielectric spectroscopy were used to analyze the performance of MG-SBS. Studies have shown that the CH/$pi$ bond enables MG-SBS materials to achieve self-healing of shear damage. MG-SBS is close to the electrostrictive properties of acrylic at lower temperature. The temperature stability of the electrostrictive performance is its unique advantage. The material will help improve the damage self-healing ability and temperature adaptability of flexible electronic devices.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"28 1","pages":"321-324"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90259225","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/ICD46958.2020.9341949
S. Haller, Damien Bachellerie, S. Pruvost, Loriane Desmars, S. Iglesias, J. Galy, G. Robert, Christian Lao, A. Girodet, M. Henriksen
Hexagonal Boron Nitride (hBN) has been used as secondary filler in an epoxy formulation in gas insulated substation (GIS) demonstrating higher electrical performance under HVAC stress, while being compatible with industrial process and constraints. A synergetic effect between hBN and alumina has been observed regarding thermal and electrical properties. A 500% increase in the thermal conductivity could be achieved with a limited impact on viscosity increase. Breakdown strength has been measured in flat sheets in oil and with embedded electrodes under divergent field simulating a defect. The breakdown strengths resulting from these different experimental setups show an interesting barrier effect from hBN even at low ratio in the formulation. Both results can be correlated with increased lifetime under thermoelectrical stress.
{"title":"Epoxy composite with hBN fillers compatible with industrial application in electrical equipment","authors":"S. Haller, Damien Bachellerie, S. Pruvost, Loriane Desmars, S. Iglesias, J. Galy, G. Robert, Christian Lao, A. Girodet, M. Henriksen","doi":"10.1109/ICD46958.2020.9341949","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341949","url":null,"abstract":"Hexagonal Boron Nitride (hBN) has been used as secondary filler in an epoxy formulation in gas insulated substation (GIS) demonstrating higher electrical performance under HVAC stress, while being compatible with industrial process and constraints. A synergetic effect between hBN and alumina has been observed regarding thermal and electrical properties. A 500% increase in the thermal conductivity could be achieved with a limited impact on viscosity increase. Breakdown strength has been measured in flat sheets in oil and with embedded electrodes under divergent field simulating a defect. The breakdown strengths resulting from these different experimental setups show an interesting barrier effect from hBN even at low ratio in the formulation. Both results can be correlated with increased lifetime under thermoelectrical stress.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"34 1","pages":"590-593"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90721214","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/ICD46958.2020.9341831
Y. Wang, Ang Li, J. Li, W. Zhang, Q. Du, M. M. Zhang, Z. H. Wang, H. C. Liang, B. Du
With the increase of transmission voltage and capacity, epoxy resin for high-voltage electrical equipment was facing great challenges, and the modification of resin materials has become an important topic in current research. This paper summarized the modification methods of epoxy resin for high-voltage electrical apparatus in recent years and introduced the progress of epoxy resin in toughening modification, high heat resistance, high thermal conductivity, and electrical property regulation, and respectively discussed the modification methods of epoxy resin. The modification methods of epoxy resin were studied, which provide a certain reference for developing the epoxy resin with excellent performance.
{"title":"Research Progress on Modification of Epoxy Resin Materials for High-Voltage Electrical Equipment","authors":"Y. Wang, Ang Li, J. Li, W. Zhang, Q. Du, M. M. Zhang, Z. H. Wang, H. C. Liang, B. Du","doi":"10.1109/ICD46958.2020.9341831","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341831","url":null,"abstract":"With the increase of transmission voltage and capacity, epoxy resin for high-voltage electrical equipment was facing great challenges, and the modification of resin materials has become an important topic in current research. This paper summarized the modification methods of epoxy resin for high-voltage electrical apparatus in recent years and introduced the progress of epoxy resin in toughening modification, high heat resistance, high thermal conductivity, and electrical property regulation, and respectively discussed the modification methods of epoxy resin. The modification methods of epoxy resin were studied, which provide a certain reference for developing the epoxy resin with excellent performance.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"8 6","pages":"637-640"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91407240","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/ICD46958.2020.9341937
Alhaytham Alqudsi, R. Ghunem, É. David, Y. Hadjadj
The presented paper aims to highlight the role of fillerpolymer interface on the DC erosion resistance of silicone rubber (SiR) outdoor insulators. SiR composites filled with nano-sized boron nitride and fumed silica have been prepared in this study. Electrical and thermal experimental tools of the inclined plane tracking-erosion test, simultaneous thermogravimetric-differential thermal analyses, and thermal conductivity measurements are used to analyze the prepared nanocomposites. The analysis primarily investigates whether the composite’s enhancement of thermal conductivity or filler interface would be more influential on erosion suppression. Literature reports that the boron nitride filler improves SiR’s thermal conductivity, whereas fumed silica provides an exceptional interaction with SiR at the filler interface. SiR was filled with boron nitride at 5wt% (percent by weight) and 10wt%, while fumed silica was loaded with 5wt% and used as a reference composite in the study. The obtained results clearly indicate a superior erosion resistance of the silica filled SiR over the boron nitride filled one. An observation which seemingly could give more significant role of the filler-polymer interface on the erosion resistance of SiR used for high voltage DC outdoor insulators.
{"title":"The Role of Filler Interface in Suppressing the Erosion of Silicone Rubber Under DC Voltage","authors":"Alhaytham Alqudsi, R. Ghunem, É. David, Y. Hadjadj","doi":"10.1109/ICD46958.2020.9341937","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341937","url":null,"abstract":"The presented paper aims to highlight the role of fillerpolymer interface on the DC erosion resistance of silicone rubber (SiR) outdoor insulators. SiR composites filled with nano-sized boron nitride and fumed silica have been prepared in this study. Electrical and thermal experimental tools of the inclined plane tracking-erosion test, simultaneous thermogravimetric-differential thermal analyses, and thermal conductivity measurements are used to analyze the prepared nanocomposites. The analysis primarily investigates whether the composite’s enhancement of thermal conductivity or filler interface would be more influential on erosion suppression. Literature reports that the boron nitride filler improves SiR’s thermal conductivity, whereas fumed silica provides an exceptional interaction with SiR at the filler interface. SiR was filled with boron nitride at 5wt% (percent by weight) and 10wt%, while fumed silica was loaded with 5wt% and used as a reference composite in the study. The obtained results clearly indicate a superior erosion resistance of the silica filled SiR over the boron nitride filled one. An observation which seemingly could give more significant role of the filler-polymer interface on the erosion resistance of SiR used for high voltage DC outdoor insulators.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"10 1","pages":"154-157"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85299538","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/ICD46958.2020.9341818
Amirhossein Mahtabani, I. Rytöluoto, R. Anyszka, Eetta Saarimäki, Xiaozhen He, K. Lahti, M. Paajanen, W. Dierkes, A. Blume
Functionalization of silica nanoparticles with polar aminosilane and its effect on space charge accumulation under high voltage direct current (DC) was studied in polypropylene (PP)/ Ethylene-Octene Copolymer (EOC) /silica nanodielectrics. The modification reaction conditions were varied in order to alter the deposited layer grafting density and morphology, and hence, the filler-polymer interfacial properties. The effect of this alteration was then studied on the space charge accumulation under a high DC field as one of the most important properties to tune for HVDC cable insulation systems. The chemical modification of the silica surface was first confirmed via Thermogravimetric Analysis (TGA) and Fourier Transform IR Spectroscopy (FTIR). Differential Scanning Calorimetry (DSC) was performed on the nanocomposites to study the effect of the nano-engineered interfacial areas on nucleation and crystal formation. The effect of the amine functional groups on the charge carrier trapping and transport in this insulation system was studied via Thermally Stimulated Depolarization Current (TSDC) method.It was argued that the amine functionality on the silica surface can induce deep trap states at the filler-polymer interfaces, and hinder further injection of the space charge. Under certain modification conditions, the aminosilane can form “island-like” structures on the silica surface. These islands can both facilitate nucleation, inducing transcrystallization at the filler-polymer interface, and further contribute to the induction of deep traps which result in reduction of space charge accumulation in the nanodielectric.
{"title":"Silica Functionalization: How Does it Affect Space Charge Accumulation in Nanodielectrics Under DC?","authors":"Amirhossein Mahtabani, I. Rytöluoto, R. Anyszka, Eetta Saarimäki, Xiaozhen He, K. Lahti, M. Paajanen, W. Dierkes, A. Blume","doi":"10.1109/ICD46958.2020.9341818","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341818","url":null,"abstract":"Functionalization of silica nanoparticles with polar aminosilane and its effect on space charge accumulation under high voltage direct current (DC) was studied in polypropylene (PP)/ Ethylene-Octene Copolymer (EOC) /silica nanodielectrics. The modification reaction conditions were varied in order to alter the deposited layer grafting density and morphology, and hence, the filler-polymer interfacial properties. The effect of this alteration was then studied on the space charge accumulation under a high DC field as one of the most important properties to tune for HVDC cable insulation systems. The chemical modification of the silica surface was first confirmed via Thermogravimetric Analysis (TGA) and Fourier Transform IR Spectroscopy (FTIR). Differential Scanning Calorimetry (DSC) was performed on the nanocomposites to study the effect of the nano-engineered interfacial areas on nucleation and crystal formation. The effect of the amine functional groups on the charge carrier trapping and transport in this insulation system was studied via Thermally Stimulated Depolarization Current (TSDC) method.It was argued that the amine functionality on the silica surface can induce deep trap states at the filler-polymer interfaces, and hinder further injection of the space charge. Under certain modification conditions, the aminosilane can form “island-like” structures on the silica surface. These islands can both facilitate nucleation, inducing transcrystallization at the filler-polymer interface, and further contribute to the induction of deep traps which result in reduction of space charge accumulation in the nanodielectric.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"11 1","pages":"281-284"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91148357","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/ICD46958.2020.9341809
Chengxing Lian, Xu Zhang, C. Emersic, I. Cotton
The accretion of ice and pollution can lead to serious damage and failure of overhead line systems during icing events. CIGRE TB361 has detailed a family of advanced coatings which claim to be superhydrophobic or ice repellent and which can be deployed on power system equipment to reduce ice accumulation. This paper examines the performance of a commercial superhydrophobic coating NeverWet on aluminium alloy substrates. This coating achieved an average contact angle of 169.5° and the lowest sliding angle of 1.5°. A series of ageing tests were designed and conducted, including thermal ageing/cycling, corona exposure, ultraviolet exposure, and ambient outdoor exposure. The superhydrophobicity of samples was retained after all ageing tests with the exception of corona exposure.
{"title":"Ageing Behaviours of Superhydrophobic and Icephobic Coatings on Overhead Line Systems","authors":"Chengxing Lian, Xu Zhang, C. Emersic, I. Cotton","doi":"10.1109/ICD46958.2020.9341809","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341809","url":null,"abstract":"The accretion of ice and pollution can lead to serious damage and failure of overhead line systems during icing events. CIGRE TB361 has detailed a family of advanced coatings which claim to be superhydrophobic or ice repellent and which can be deployed on power system equipment to reduce ice accumulation. This paper examines the performance of a commercial superhydrophobic coating NeverWet on aluminium alloy substrates. This coating achieved an average contact angle of 169.5° and the lowest sliding angle of 1.5°. A series of ageing tests were designed and conducted, including thermal ageing/cycling, corona exposure, ultraviolet exposure, and ambient outdoor exposure. The superhydrophobicity of samples was retained after all ageing tests with the exception of corona exposure.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"02 1","pages":"138-141"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91265890","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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