Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481051
Han Jiang, Y. Tu, Zhikang Yuan, Cheng Wang
In recent years, the local temperature rise of composite insulators has become a serious problem. Research shows some of the insulators with local temperature rise have partial erosion in the core, while their outer sheath worked well. It is of great significance to study the electric field along the surface of the core. In this paper, a two-dimensional axisymmetric computational model was established for insulator strings of 500kV transmission lines to study the influence of internal grading ring and corona ring on the surface electric field of the core. It can be concluded that the internal grading ring greatly homogenized the field strength. The position and size of the peak point of the surface electric field of the core can be adjusted by changing the position of the internal grading ring. The position of corona ring affects the value of peak point of electric field. When the relative position of the two is fixed, the change of the overall position has little effect on the peak value of the field strength.
{"title":"Calculation and Optimization of Electric Field of Insulators with Internal Grading Ring","authors":"Han Jiang, Y. Tu, Zhikang Yuan, Cheng Wang","doi":"10.1109/EIC.2018.8481051","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481051","url":null,"abstract":"In recent years, the local temperature rise of composite insulators has become a serious problem. Research shows some of the insulators with local temperature rise have partial erosion in the core, while their outer sheath worked well. It is of great significance to study the electric field along the surface of the core. In this paper, a two-dimensional axisymmetric computational model was established for insulator strings of 500kV transmission lines to study the influence of internal grading ring and corona ring on the surface electric field of the core. It can be concluded that the internal grading ring greatly homogenized the field strength. The position and size of the peak point of the surface electric field of the core can be adjusted by changing the position of the internal grading ring. The position of corona ring affects the value of peak point of electric field. When the relative position of the two is fixed, the change of the overall position has little effect on the peak value of the field strength.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122532333","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481139
D. Fabiani, S. V. Suraci, Stefano Bulzaga
This paper deals with the effect of a long storage time after thermal and radiation aging on electrical and mechanical properties of insulating materials used in nuclear power plant cables. Strong post-irradiation effects were found on XLPE cable insulation years after irradiation. In particular, a dramatic reduction of mechanical properties was observed, suggesting insulation crosslinking and/or oxidation, as well as an increase of the imaginary permittivity values, particularly in the low frequency range where interfacial phenomena are active. This latter could be associated likely to the increase of interface between amorphous and crystalline regions, thus supporting the evidence that post-irradiation effects may provide mostly polymer crosslinking during storage time at room temperature.
{"title":"Aging Investigation of Low-Voltage Cable Insulation Used in Nuclear Power Plants","authors":"D. Fabiani, S. V. Suraci, Stefano Bulzaga","doi":"10.1109/EIC.2018.8481139","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481139","url":null,"abstract":"This paper deals with the effect of a long storage time after thermal and radiation aging on electrical and mechanical properties of insulating materials used in nuclear power plant cables. Strong post-irradiation effects were found on XLPE cable insulation years after irradiation. In particular, a dramatic reduction of mechanical properties was observed, suggesting insulation crosslinking and/or oxidation, as well as an increase of the imaginary permittivity values, particularly in the low frequency range where interfacial phenomena are active. This latter could be associated likely to the increase of interface between amorphous and crystalline regions, thus supporting the evidence that post-irradiation effects may provide mostly polymer crosslinking during storage time at room temperature.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131712268","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481124
Joseph Jineeth, R. Mallepally, T. Sindhu
Classification of partial discharge (PD) patterns is a significant tool in identifying the type of defects in cables. Development of reliable classifiers to identify various defects in the cable insulation is of vital importance in assessing the condition of cables in service. This paper proposes the development of Artificial Neural Network (ANN) based classifiers and Support Vector Machine (SVM) classifier for identification of cable defects such as voids, metal particle in the insulation, high potential metal tip, semiconductor layer tip, metals in the insulation and insulation incision. PD measurements are done on 11 kV XLPE cables with defects and wavelet based de-noising method is applied to abstract the PD pulses. Various PRPD features are extracted and used for training the ANN and SVM based models in MATLAB environment. The performance of SVM classifier and ANN based back propagation neural network classifier are analyzed for various types of defects. Classification accuracy of each models are analyzed and feasibility of optimum models for classification of cable defects is presented.
{"title":"Classification of Partial Discharge Sources in XLPE Cables by Artificial Neural Networks and Support Vector Machine","authors":"Joseph Jineeth, R. Mallepally, T. Sindhu","doi":"10.1109/EIC.2018.8481124","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481124","url":null,"abstract":"Classification of partial discharge (PD) patterns is a significant tool in identifying the type of defects in cables. Development of reliable classifiers to identify various defects in the cable insulation is of vital importance in assessing the condition of cables in service. This paper proposes the development of Artificial Neural Network (ANN) based classifiers and Support Vector Machine (SVM) classifier for identification of cable defects such as voids, metal particle in the insulation, high potential metal tip, semiconductor layer tip, metals in the insulation and insulation incision. PD measurements are done on 11 kV XLPE cables with defects and wavelet based de-noising method is applied to abstract the PD pulses. Various PRPD features are extracted and used for training the ANN and SVM based models in MATLAB environment. The performance of SVM classifier and ANN based back propagation neural network classifier are analyzed for various types of defects. Classification accuracy of each models are analyzed and feasibility of optimum models for classification of cable defects is presented.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128165190","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481089
E. R. Anagha, Josenh Jineeth, T. Sindhu
Occurrence of partial discharges (PD) is a critical phenomenon preceding an impending insulation failure in HVDC cables. Modeling of PD due to deformations in the insulation is a vital step towards the development of a reliable monitoring tool to assess the condition of cable insulation. Finite Element Method (FEM) is proved to be a constructive technique in modeling partial discharge phenomena in AC cables. Modeling of PD requires the estimation of electric field which is complex in HVDC cables compared to HVAC cables due to the dependence of material conductivity on temperature and electric field inside the cable geometry. This paper is an attempt towards the development of a FEM based model for simulation of partial discharge occurrence due to voids in the insulation of HVDC cables. A three dimensional FEM model of a 500 kV HVDC cable with a cylindrical void inside the insulation is modeled in ANSYS platform. The developed model is simulated for voids of two different sizes and apparent charge is estimated for each case. The simulation results show the feasibility of the developed FEM model to simulate the PD phenomena in HVDC cables under steady DC conditions and changing temperature environment.
{"title":"A Finite Element Method Based Approach for Modeling of Partial Discharges in HVDC Cables","authors":"E. R. Anagha, Josenh Jineeth, T. Sindhu","doi":"10.1109/EIC.2018.8481089","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481089","url":null,"abstract":"Occurrence of partial discharges (PD) is a critical phenomenon preceding an impending insulation failure in HVDC cables. Modeling of PD due to deformations in the insulation is a vital step towards the development of a reliable monitoring tool to assess the condition of cable insulation. Finite Element Method (FEM) is proved to be a constructive technique in modeling partial discharge phenomena in AC cables. Modeling of PD requires the estimation of electric field which is complex in HVDC cables compared to HVAC cables due to the dependence of material conductivity on temperature and electric field inside the cable geometry. This paper is an attempt towards the development of a FEM based model for simulation of partial discharge occurrence due to voids in the insulation of HVDC cables. A three dimensional FEM model of a 500 kV HVDC cable with a cylindrical void inside the insulation is modeled in ANSYS platform. The developed model is simulated for voids of two different sizes and apparent charge is estimated for each case. The simulation results show the feasibility of the developed FEM model to simulate the PD phenomena in HVDC cables under steady DC conditions and changing temperature environment.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121471132","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481080
E. Eberg, T. Aakre, G. Berg, S. Hvidsten
Stator winding insulation is the part of the hydrogenerator experiencing the highest number and the most damaging failures. Partial discharge (PD) measurement, both offline and online, are commonly used for condition assessment and monitoring of electrical machines. The main concern of using very low frequency (VLF) methods is the changed electrical field distributions compared to that at power frequency. Hence, PD measurements performed at VLF should be carefully assessed and compared to PD measurements at power frequencies. In this work, offline PD measurement at VLF are presented and compared to power frequency online measurements of a 50-year-old hydrogenerator in Norway, using statistical analysis of phase resolved PD recordings. It is found that both offline VLF and online assessment can identify unnormal PD activity in a specific phase, although the phase resolved PD patterns are not similar for VLF offline and online assessment.
{"title":"Comparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norway","authors":"E. Eberg, T. Aakre, G. Berg, S. Hvidsten","doi":"10.1109/EIC.2018.8481080","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481080","url":null,"abstract":"Stator winding insulation is the part of the hydrogenerator experiencing the highest number and the most damaging failures. Partial discharge (PD) measurement, both offline and online, are commonly used for condition assessment and monitoring of electrical machines. The main concern of using very low frequency (VLF) methods is the changed electrical field distributions compared to that at power frequency. Hence, PD measurements performed at VLF should be carefully assessed and compared to PD measurements at power frequencies. In this work, offline PD measurement at VLF are presented and compared to power frequency online measurements of a 50-year-old hydrogenerator in Norway, using statistical analysis of phase resolved PD recordings. It is found that both offline VLF and online assessment can identify unnormal PD activity in a specific phase, although the phase resolved PD patterns are not similar for VLF offline and online assessment.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122646328","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481023
A. Khazanov, A. Gegenava, B. Nindra
Thermal Cycling (TC) test is commonly used for long period of time and in 2012 the standard IEEE 1310 become a recommended practice with details of test parameters and test procedure. Meeting of the specified test parameters is very important. Authors describe their considerations to meet requirements IEEE 1310 for uniformity of the temperature distribution and controlling the copper temperature. IEEE 1310 instruction for cooling air circulation is too restrictive and may not provide the adequate cooling especially for large coils. In the same time standard should provide more guidance for copper temperature measurement. Thermocouple should be installed directly in contact with the conductor for the proper measurements.
{"title":"Practical Experience with Thermal Cycling per IEEE 1310–2012. Alternative Approach to Monitor Copper Temperature and to Efficient Cooling Air Flow","authors":"A. Khazanov, A. Gegenava, B. Nindra","doi":"10.1109/EIC.2018.8481023","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481023","url":null,"abstract":"Thermal Cycling (TC) test is commonly used for long period of time and in 2012 the standard IEEE 1310 become a recommended practice with details of test parameters and test procedure. Meeting of the specified test parameters is very important. Authors describe their considerations to meet requirements IEEE 1310 for uniformity of the temperature distribution and controlling the copper temperature. IEEE 1310 instruction for cooling air circulation is too restrictive and may not provide the adequate cooling especially for large coils. In the same time standard should provide more guidance for copper temperature measurement. Thermocouple should be installed directly in contact with the conductor for the proper measurements.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127624535","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481027
T. Chihani, A. Mekhaldi, A. Beroual, M. Teguar
This paper presents a new equation for the linear resistance of discharge channel during the flashover of polluted insulators basing on an electro-energetic balance and by using some mathematical formulations. This equation shows the dependency on the applied voltage, the temperature, thermal conductivity and length of the discharge channel, the resistance and capacitance of pollution layer; the radius of discharge channel is assumed to be variable. It is valid during the whole discharge process (i.e.; during the different steps of the discharge development) in AC and DC voltages and in both static and dynamic regimes. The proposed equation has the particularity to be an analytical equation, in opposition with the main equations used till today to determine the linear resistance of discharge propagating over polluted insulators up to flashover and which are empirical equations.
{"title":"A New Analytical Equation for the Linear Resistance of Discharge During Flashover of Polluted Insulators Under AC or DC Voltages","authors":"T. Chihani, A. Mekhaldi, A. Beroual, M. Teguar","doi":"10.1109/EIC.2018.8481027","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481027","url":null,"abstract":"This paper presents a new equation for the linear resistance of discharge channel during the flashover of polluted insulators basing on an electro-energetic balance and by using some mathematical formulations. This equation shows the dependency on the applied voltage, the temperature, thermal conductivity and length of the discharge channel, the resistance and capacitance of pollution layer; the radius of discharge channel is assumed to be variable. It is valid during the whole discharge process (i.e.; during the different steps of the discharge development) in AC and DC voltages and in both static and dynamic regimes. The proposed equation has the particularity to be an analytical equation, in opposition with the main equations used till today to determine the linear resistance of discharge propagating over polluted insulators up to flashover and which are empirical equations.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129956111","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481098
Z. Ahmed, Mojtaba Rostaghi Chalaki, Ian Robinson, J. Klüss
The transient electric and magnetic fields radiated by the discharge of a high voltage impulse generator have well-known effects of creating serious interferences with the measuring and recording equipment. These effects may result in the mis-operation, or in the worst case, may damage the electronic circuitry of the measuring system. Measurements were performed to investigate the characteristics and distribution of electric and magnetic field components originating from the operation of a 3MV impulse generator. E-Field and H-Field were simultaneously recorded and measured independently. D-dot probes measuring the time rate of change of electrical displacement and loop probes observing the time rate of change of magnetic fields were used. The electromagnetic interferences in the vicinity of the impulse generator and control room and the dependence of these interferences on the charging voltage of the generator, elevation, and type of connection arrangements are investigated. The results and discussions from this study can be used for the cost-effective electromagnetic shielding of sensitive measurement equipment in large high voltage laboratories.
{"title":"Electromagnetic Radiation Distribution in a High Voltage Test Environment","authors":"Z. Ahmed, Mojtaba Rostaghi Chalaki, Ian Robinson, J. Klüss","doi":"10.1109/EIC.2018.8481098","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481098","url":null,"abstract":"The transient electric and magnetic fields radiated by the discharge of a high voltage impulse generator have well-known effects of creating serious interferences with the measuring and recording equipment. These effects may result in the mis-operation, or in the worst case, may damage the electronic circuitry of the measuring system. Measurements were performed to investigate the characteristics and distribution of electric and magnetic field components originating from the operation of a 3MV impulse generator. E-Field and H-Field were simultaneously recorded and measured independently. D-dot probes measuring the time rate of change of electrical displacement and loop probes observing the time rate of change of magnetic fields were used. The electromagnetic interferences in the vicinity of the impulse generator and control room and the dependence of these interferences on the charging voltage of the generator, elevation, and type of connection arrangements are investigated. The results and discussions from this study can be used for the cost-effective electromagnetic shielding of sensitive measurement equipment in large high voltage laboratories.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121049549","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481115
Bouazza Taghia, T. Billard, Jean-Pierre Carayon, D. Malec, H. Piquet, A. Belinger
The voltage level aboard new aircraft generations has grown from 115VAC to 230VAC. This has given rise to a new HVDC +/- 270V instead of +270V. The Adjustable Speed Drives (ASD) aboard more electrical aircraft are currently fed by fast switching PWM IGBT converters which rise time and fall time are greater than 50ns. To improve the converters power density, the very fast Wide Bandgap semiconductor technologies (Silicon Carbide) are currently under evaluation; their switching rise time and fall time could be less than 20ns. This paper, by using industrial ASD fed by 540Vdc, initially addresses an experimental investigations analysis of motor overvoltages according to: inverters technologies (IGBT and SiC), harness length and harness shielding. Then, investigations on the Partial Discharges Inception Voltage (PDIV) are carried out on primary components of Electrical Insulation System (EIS) type 1 at atmospheric and reduced pressures, according to several parameters: magnet wire (MW) diameter, MW grade, polyimide insulating paper thickness. The paper concludes with a discussion of the different results and thoughts about overvoltages and partial discharges challenges.
{"title":"Investigations on Partial Discharges Risk in Aeronautical Rotating Machine Fed by HVDC 540VDC Network","authors":"Bouazza Taghia, T. Billard, Jean-Pierre Carayon, D. Malec, H. Piquet, A. Belinger","doi":"10.1109/EIC.2018.8481115","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481115","url":null,"abstract":"The voltage level aboard new aircraft generations has grown from 115VAC to 230VAC. This has given rise to a new HVDC +/- 270V instead of +270V. The Adjustable Speed Drives (ASD) aboard more electrical aircraft are currently fed by fast switching PWM IGBT converters which rise time and fall time are greater than 50ns. To improve the converters power density, the very fast Wide Bandgap semiconductor technologies (Silicon Carbide) are currently under evaluation; their switching rise time and fall time could be less than 20ns. This paper, by using industrial ASD fed by 540Vdc, initially addresses an experimental investigations analysis of motor overvoltages according to: inverters technologies (IGBT and SiC), harness length and harness shielding. Then, investigations on the Partial Discharges Inception Voltage (PDIV) are carried out on primary components of Electrical Insulation System (EIS) type 1 at atmospheric and reduced pressures, according to several parameters: magnet wire (MW) diameter, MW grade, polyimide insulating paper thickness. The paper concludes with a discussion of the different results and thoughts about overvoltages and partial discharges challenges.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117092101","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481096
S. J. Han
Graphene is a new form of solid carbon. The microstructure analysis showed that graphene is a flat exfoliated layer of carbon atoms tightly packed into a two dimensional honey comb-like structure with the thickness in a nano-scale. It is as intrinsically electrically conductive as carbon black and also thermally conductive, which are practical properties in a wire and cable application. One of key features of graphene is very high surface area and high aspect ratio. In this study, it was investigated about effect of graphene in polymer nanocomposites in a flame retardant application. It was found that graphene in polyethylene compounds demonstrated to increase oxygen index in comparison to a carbon black system while resulting in self-extinguishing behavior by forming homogeneous intumescent chars in horizontal burning test. It also reduced average heat release rate in comparison to carbon black system in a Cone calorimeter test.
{"title":"Flame Retardant Behavior of Cable Compound with Graphene","authors":"S. J. Han","doi":"10.1109/EIC.2018.8481096","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481096","url":null,"abstract":"Graphene is a new form of solid carbon. The microstructure analysis showed that graphene is a flat exfoliated layer of carbon atoms tightly packed into a two dimensional honey comb-like structure with the thickness in a nano-scale. It is as intrinsically electrically conductive as carbon black and also thermally conductive, which are practical properties in a wire and cable application. One of key features of graphene is very high surface area and high aspect ratio. In this study, it was investigated about effect of graphene in polymer nanocomposites in a flame retardant application. It was found that graphene in polyethylene compounds demonstrated to increase oxygen index in comparison to a carbon black system while resulting in self-extinguishing behavior by forming homogeneous intumescent chars in horizontal burning test. It also reduced average heat release rate in comparison to carbon black system in a Cone calorimeter test.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121392896","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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