Pub Date : 2020-06-01DOI: 10.1109/EIC47619.2020.9158717
Penglei Xu, Y. Di, Xiaokai Guo, Saike Yang, Tian Li, Haochen Wang
The cable joint is one of the most vulnerable areas in cable. Based on the theoretical knowledge of time domain reflectometry, this paper establishes a three-dimensional simplified single-core model of the 10kV cold-shrinkable intermediate joint in the CST (Computer Simulation Technology) Studio Suite, and carries out a detailed analysis on joint intruded by water. This paper briefly describes the reflection principle of traveling waves propagating on transmission lines, analyzes changes of reflection waveform and impedance characteristics under different moisture degree at composite interface of joint, and studies the corresponding relationship between moisture degree and impedance characteristics. The results show that the impedance of moisture part will decrease with increase of moisture degree, and amplitude of reflected waveform decreases, and in the severe case, pulses in the opposite direction will appear. At last, two types of basis, vertical comparison and horizontal comparison, are put forward to judge water inflow and moisture degree in cable joint.
电缆接头是电缆中最脆弱的部位之一。本文基于时域反射法的理论知识，在CST (Computer Simulation Technology) Studio Suite中建立了10kV冷缩中间节理的三维简化单芯模型，并对节理的水侵进行了详细分析。本文简要介绍了行波在传输线上传播的反射原理，分析了不同含水率下节理复合界面反射波形和阻抗特性的变化，研究了含水率与阻抗特性的对应关系。结果表明:随着含水率的增加，含水率部分的阻抗减小，反射波形幅度减小，严重时出现反方向脉冲;最后，提出了两种判断电缆接头进水和含水率的依据:竖向对比和水平对比。
{"title":"Simulation and Analysis of Impedance Characteristics of MV Cable Joint with Different Moisture Degree","authors":"Penglei Xu, Y. Di, Xiaokai Guo, Saike Yang, Tian Li, Haochen Wang","doi":"10.1109/EIC47619.2020.9158717","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158717","url":null,"abstract":"The cable joint is one of the most vulnerable areas in cable. Based on the theoretical knowledge of time domain reflectometry, this paper establishes a three-dimensional simplified single-core model of the 10kV cold-shrinkable intermediate joint in the CST (Computer Simulation Technology) Studio Suite, and carries out a detailed analysis on joint intruded by water. This paper briefly describes the reflection principle of traveling waves propagating on transmission lines, analyzes changes of reflection waveform and impedance characteristics under different moisture degree at composite interface of joint, and studies the corresponding relationship between moisture degree and impedance characteristics. The results show that the impedance of moisture part will decrease with increase of moisture degree, and amplitude of reflected waveform decreases, and in the severe case, pulses in the opposite direction will appear. At last, two types of basis, vertical comparison and horizontal comparison, are put forward to judge water inflow and moisture degree in cable joint.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123297071","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158687
Y. Xiaoping, Wu Yiming, L. Jiansheng, Wei Chao, Wu Peng, Xu Tiantian, L. Bonan, Chen Yingyu
The detection and analysis of oil chromatography is the most effective method to detect the internal defects of the transformer, but the problems in design, manufacture and other aspects have limited the on-site detection. On the analysis of the Jiangsu power grid oil-immersed current transformer oil dissolved gas testing data and the collapse of the inspection, the effectiveness of the gases dissolved in transformer oil testing technology and limitations are studied, and related suggestions are put forward.
{"title":"Analysis and suggestion on the chromatographic detection of inverted oil immersed current transformer","authors":"Y. Xiaoping, Wu Yiming, L. Jiansheng, Wei Chao, Wu Peng, Xu Tiantian, L. Bonan, Chen Yingyu","doi":"10.1109/eic47619.2020.9158687","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158687","url":null,"abstract":"The detection and analysis of oil chromatography is the most effective method to detect the internal defects of the transformer, but the problems in design, manufacture and other aspects have limited the on-site detection. On the analysis of the Jiangsu power grid oil-immersed current transformer oil dissolved gas testing data and the collapse of the inspection, the effectiveness of the gases dissolved in transformer oil testing technology and limitations are studied, and related suggestions are put forward.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114149868","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 : 2020-06-01DOI: 10.1109/EIC47619.2020.9158671
M. Kawada, R. Ikeda, M. Aiba, Ken Watanabe, Masao Suzuki
A large number of ground coils are used in superconducting magnetic levitation (Maglev) systems; therefore, it has been considered that condition monitoring systems for the ground coils are mounted on Maglev trains. We have been studying radio sensing techniques to detect partial discharges (PD) occurring in propulsion coils. In this study, a radio interferometer system with a vector-antenna was mounted on a test bogie, which can be run at the speed of 200 km/h by remote control. The vector-antenna composed of vertical and horizontal dipole-antennas was set to the center of the antenna-array of the radio interferometer system. A set of mock-ups of the propulsion coil and the levitation-guidance coil was set on the side of the test track of which length is 500 m. The propulsion coil has multiple holes penetrating through insulation to the inner conductor for attaching a needle-electrode; one or some of the holes can be voluntarily chosen to generate PDs. Experimental results showed that the propulsion coil with a PD source set behind the levitation-guidance coil could be located from the test bogie running at the speeds of 198.5 km/h and 212.3 km/h.
{"title":"Detection of Partial Discharges Occurring in Propulsion Coils of Superconducting Maglev Systems from a Test Bogie Running at High Speed Using a Radio Interferometer System with a Vector-Antenna","authors":"M. Kawada, R. Ikeda, M. Aiba, Ken Watanabe, Masao Suzuki","doi":"10.1109/EIC47619.2020.9158671","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158671","url":null,"abstract":"A large number of ground coils are used in superconducting magnetic levitation (Maglev) systems; therefore, it has been considered that condition monitoring systems for the ground coils are mounted on Maglev trains. We have been studying radio sensing techniques to detect partial discharges (PD) occurring in propulsion coils. In this study, a radio interferometer system with a vector-antenna was mounted on a test bogie, which can be run at the speed of 200 km/h by remote control. The vector-antenna composed of vertical and horizontal dipole-antennas was set to the center of the antenna-array of the radio interferometer system. A set of mock-ups of the propulsion coil and the levitation-guidance coil was set on the side of the test track of which length is 500 m. The propulsion coil has multiple holes penetrating through insulation to the inner conductor for attaching a needle-electrode; one or some of the holes can be voluntarily chosen to generate PDs. Experimental results showed that the propulsion coil with a PD source set behind the levitation-guidance coil could be located from the test bogie running at the speeds of 198.5 km/h and 212.3 km/h.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114273972","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 : 2020-06-01DOI: 10.1109/EIC47619.2020.9158760
Xu Zhang, C. Emersic, Chengxing Lian, I. Cotton
Higher voltages are increasingly being used in power transmission systems to improve capacity. Whilst overhead line conductors are well-designed for mechanical and electrical requirements, surface defects (e.g. damage, insects, raindrops, and pollution) enhance the electric field and may lead to corona discharge. Raindrops are the primary source of such corona discharge and the discharge behaviour is examined using a single waterdrop under the influence of an AC electric field in a sphere to plane configuration. The droplet is set at the centre of the sphere which is the high voltage electrode and MPD test system is employed to record the discharge process. When the applied voltage is increased beyond PD inception voltage, corona discharge occurs and is observed by a UV camera. The discharge process lasts for 119 s and extinguishes when the drop is ejected and become small enough not to discharge in this electric field. According to Pulse Sequence Analysis, the discharge behaviour does not change significantly during the discharge process but the maximum PD magnitude which is 11.46 nC and the maximum PD number happens at the end of discharge with wider phase angle. Furthermore, the time difference of the adjacent two pulses is nearly 0 s and 0.02 s and the voltage difference is around 0 kV, meaning they occur almost simultaneously or one cycle apart at near voltage. Three situations when discharge probably happens were listed in accordance with voltage difference.
{"title":"Corona Discharge Characteristics of a Single Water Droplet under an AC Electric Field","authors":"Xu Zhang, C. Emersic, Chengxing Lian, I. Cotton","doi":"10.1109/EIC47619.2020.9158760","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158760","url":null,"abstract":"Higher voltages are increasingly being used in power transmission systems to improve capacity. Whilst overhead line conductors are well-designed for mechanical and electrical requirements, surface defects (e.g. damage, insects, raindrops, and pollution) enhance the electric field and may lead to corona discharge. Raindrops are the primary source of such corona discharge and the discharge behaviour is examined using a single waterdrop under the influence of an AC electric field in a sphere to plane configuration. The droplet is set at the centre of the sphere which is the high voltage electrode and MPD test system is employed to record the discharge process. When the applied voltage is increased beyond PD inception voltage, corona discharge occurs and is observed by a UV camera. The discharge process lasts for 119 s and extinguishes when the drop is ejected and become small enough not to discharge in this electric field. According to Pulse Sequence Analysis, the discharge behaviour does not change significantly during the discharge process but the maximum PD magnitude which is 11.46 nC and the maximum PD number happens at the end of discharge with wider phase angle. Furthermore, the time difference of the adjacent two pulses is nearly 0 s and 0.02 s and the voltage difference is around 0 kV, meaning they occur almost simultaneously or one cycle apart at near voltage. Three situations when discharge probably happens were listed in accordance with voltage difference.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131870421","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158665
S. Leivo, E. Briosso
In this online DGA trial, fault-gas formation and moisture in a transformer was studied real time under varying transformer-operating conditions over roughly one-year period. Some recently updated data cover over 2 years. The main method used was to look if there was any correlation between gas levels or gassing rate and transformer operating conditions like loading, top oil temperature and estimated hot spot. During the study, the transformer was also degassed and the gases were monitored online during and after the degassing. The degassing process itself was efficient. However, soon after finishing the process some gas levels increased significantly whereas others not so much. This is discussed in this paper together with the actual measurement graphs. In addition, the performance of the online DGA monitor was studied by comparing the readings of the monitor to frequently taken oil samples analyzed in a laboratory. All 7 key fault gases were measured: methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), carbon monoxide (CO), carbon dioxide (CO2) and hydrogen (H2).
{"title":"A case study, Online DGA during varying transformer conditions","authors":"S. Leivo, E. Briosso","doi":"10.1109/eic47619.2020.9158665","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158665","url":null,"abstract":"In this online DGA trial, fault-gas formation and moisture in a transformer was studied real time under varying transformer-operating conditions over roughly one-year period. Some recently updated data cover over 2 years. The main method used was to look if there was any correlation between gas levels or gassing rate and transformer operating conditions like loading, top oil temperature and estimated hot spot. During the study, the transformer was also degassed and the gases were monitored online during and after the degassing. The degassing process itself was efficient. However, soon after finishing the process some gas levels increased significantly whereas others not so much. This is discussed in this paper together with the actual measurement graphs. In addition, the performance of the online DGA monitor was studied by comparing the readings of the monitor to frequently taken oil samples analyzed in a laboratory. All 7 key fault gases were measured: methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), carbon monoxide (CO), carbon dioxide (CO2) and hydrogen (H2).","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134416151","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}
Recognition for partial discharge in switchgear was faced with the problem of uncontrollable interference and difficulty of initial parameters determination, so a method based on Kohonen network was presented to improve such problems. By designing defects that meet the characteristics of discharge in switchgear multiple samples were collected, and statistical parameters are extracted from two-dimensional distributions. The influence of Kohonen network's parameters on its recognition effect was investigated, after which the recognition effect is optimized. Then by comparing recognition result of this network and other commonly used recognition algorithms, it is proved that Kohonen network has high stability and good recognition performance when facing switchgear's partial discharge recognition problem.
{"title":"Recognition of Partial Discharge in Switchgear Based on Kohonen Network","authors":"Hangwei Zhang, Xiaolong Xu, Yuan Yan, Penglei Xu, Yuxin Lu, Z. Hou","doi":"10.1109/EIC47619.2020.9158688","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158688","url":null,"abstract":"Recognition for partial discharge in switchgear was faced with the problem of uncontrollable interference and difficulty of initial parameters determination, so a method based on Kohonen network was presented to improve such problems. By designing defects that meet the characteristics of discharge in switchgear multiple samples were collected, and statistical parameters are extracted from two-dimensional distributions. The influence of Kohonen network's parameters on its recognition effect was investigated, after which the recognition effect is optimized. Then by comparing recognition result of this network and other commonly used recognition algorithms, it is proved that Kohonen network has high stability and good recognition performance when facing switchgear's partial discharge recognition problem.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117145961","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}
Lower fluorides of sulfur are primary byproducts of SF6 when insulation failures occur, which decompose into final long-lived by-products in the presence of oxygen or moisture, such as SO2F2, SO2, SOF2 and SOF4. The decomposition mechanism of SF6 is complicated, and the decomposition products are different under different insulation failures. Therefore, summarizing a variation of SF6 decomposition products under different faults and different discharge conditions can provide a reference for fault diagnosis of SF6 gas-insulated electrical equipment. Based on oxygen isotope tracer technique, different contents of H218O and 18O2 were injected into the text vessel to simulate an environment containing trace moisture or oxygen. Then, a series of corona discharge and spark discharge experiments were carried out. The decomposition gases were detected by gas chromatography-mass spectrometry (GC-MS). The decomposition gases S16O2F2, S16O18OF2, S18O2F2, S16O2 and S16O18O indicate that moisture and oxygen participate in the decomposition reaction of SF6. Furthermore, the influence of trace moisture and oxygen on the contents of three isotopic compounds of SO2F2 were analyzed, and the ratios of SO2F2 to (SO2+SOF2) were investigated in the trace moisture environment. The results show that both H2O and O2 involve into the formation of SO2F2. In the trace moisture environment, the peak area ratio of SO2F2/ (SOF2+SO2) gradually decreases with the increase of water injection. The change of the ratio of SO2F2 to (SOF2+SO2) may provide an index for detecting the moisture content of SF6 gas-insulated electrical equipment.
{"title":"Influence of Trace H2O and O2 on SF6 Decomposition under Corona Discharge and Spark Discharge based on Oxygen Isotope Tracer","authors":"Zhenrui Zhou, Dong Han, Mingyue Zhao, Guoqiang Zhang","doi":"10.1109/eic47619.2020.9158724","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158724","url":null,"abstract":"Lower fluorides of sulfur are primary byproducts of SF<inf>6</inf> when insulation failures occur, which decompose into final long-lived by-products in the presence of oxygen or moisture, such as SO<inf>2</inf>F<inf>2</inf>, SO<inf>2</inf>, SOF<inf>2</inf> and SOF<inf>4</inf>. The decomposition mechanism of SF<inf>6</inf> is complicated, and the decomposition products are different under different insulation failures. Therefore, summarizing a variation of SF<inf>6</inf> decomposition products under different faults and different discharge conditions can provide a reference for fault diagnosis of SF<inf>6</inf> gas-insulated electrical equipment. Based on oxygen isotope tracer technique, different contents of H<inf>2</inf><sup>18</sup>O and <sup>18</sup>O<inf>2</inf> were injected into the text vessel to simulate an environment containing trace moisture or oxygen. Then, a series of corona discharge and spark discharge experiments were carried out. The decomposition gases were detected by gas chromatography-mass spectrometry (GC-MS). The decomposition gases S<sup>16</sup>O<inf>2</inf>F<inf>2</inf>, S<sup>16</sup>O<sup>18</sup>OF<inf>2</inf>, S<sup>18</sup>O<inf>2</inf>F<inf>2</inf>, S<sup>16</sup>O<inf>2</inf> and S<sup>16</sup>O<sup>18</sup>O indicate that moisture and oxygen participate in the decomposition reaction of SF<inf>6</inf>. Furthermore, the influence of trace moisture and oxygen on the contents of three isotopic compounds of SO<inf>2</inf>F<inf>2</inf> were analyzed, and the ratios of SO<inf>2</inf>F<inf>2</inf> to (SO<inf>2</inf>+SOF<inf>2</inf>) were investigated in the trace moisture environment. The results show that both H<inf>2</inf>O and O<inf>2</inf> involve into the formation of SO<inf>2</inf>F<inf>2</inf>. In the trace moisture environment, the peak area ratio of SO<inf>2</inf>F<inf>2</inf>/ (SOF<inf>2</inf>+SO<inf>2</inf>) gradually decreases with the increase of water injection. The change of the ratio of SO<inf>2</inf>F<inf>2</inf> to (SOF<inf>2</inf>+SO<inf>2</inf>) may provide an index for detecting the moisture content of SF<inf>6</inf> gas-insulated electrical equipment.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117157538","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158721
Mojtaba Rostaghi Chalaki, K. Yousefpour, Z. Ahmed, Chanyeop Park
Measurement of transient phenomenon such as individual PD pulses requires fast, accurate, and noise-free circuits. The bandwidth of elements used in these circuits can affect the captured PD pulse waveshapes. Transmission lines, which couple the PD sources to data recording devices, are one the most important elements among various components in measurement systems. Therefore, transmission lines with wide bandwidths are necessary in building testbeds that capture individual PD pulses. This paper explains the requirements of an ideal Transmission line design that enables accurate individual PD pulse waveshape measurements. We comprehensively use finite element analysis (FEA) simulation to analyze the impact of PD testbed design on the PD pulse measurement performance. Based on the newly designed testbed with the proposed transmission line design, individual PD measurement performance is examined by the time-domain analysis of the FEA simulation. The results show the effect of transmission line parameters on its frequency responses. Also, the application of a narrow bandwidth transmission line for PD pulse measurement has been confirmed to deform its waveshape. Furthermore, the time-domain results confirmed the impact of transmission lines reflection and losses on captured waveshapes.
{"title":"Transmission Line Design for Individual Partial Discharge Waveshape Measurement","authors":"Mojtaba Rostaghi Chalaki, K. Yousefpour, Z. Ahmed, Chanyeop Park","doi":"10.1109/eic47619.2020.9158721","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158721","url":null,"abstract":"Measurement of transient phenomenon such as individual PD pulses requires fast, accurate, and noise-free circuits. The bandwidth of elements used in these circuits can affect the captured PD pulse waveshapes. Transmission lines, which couple the PD sources to data recording devices, are one the most important elements among various components in measurement systems. Therefore, transmission lines with wide bandwidths are necessary in building testbeds that capture individual PD pulses. This paper explains the requirements of an ideal Transmission line design that enables accurate individual PD pulse waveshape measurements. We comprehensively use finite element analysis (FEA) simulation to analyze the impact of PD testbed design on the PD pulse measurement performance. Based on the newly designed testbed with the proposed transmission line design, individual PD measurement performance is examined by the time-domain analysis of the FEA simulation. The results show the effect of transmission line parameters on its frequency responses. Also, the application of a narrow bandwidth transmission line for PD pulse measurement has been confirmed to deform its waveshape. Furthermore, the time-domain results confirmed the impact of transmission lines reflection and losses on captured waveshapes.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"93 15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126041567","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158729
Sadegh Ghanbar, Sedigheh Nazaripour, Marek Kornowski, Keaton Whitaker
Epoxy resin samples were prepared using cycloaliphatic resin and anhydride curing agents. Response Surface Methodology (RSM) was applied to determine the effect of five independent variables (Silbond W12EST, MoldXA400, CSR, PC1000 and BYK3701) at 5 levels on the dependent variables thermal shock crack resistance (TSR) and track resistance. 33 experimental samples were prepared according to experimental design made by RSM. It was observed that not only an increase in the amount of MoldX A400 in the compound improved the tracking, but also amount Silbond W12EST had positive effect on it. The results showed that if the total filler amount in the formulation is lower than 60% the time-to-track is less than 300 min, even with using a high amount of MoldXA400 (30%). Increasing the amount of Silbond W12EST as well as core-shell toughening agent (CSR) microparticles can improve the TSR because of crack propagation inhibition caused by particles. On the other hand, an increase in MoldX A400 deteriorated TSR due to the creating weak bonds with epoxy matrix.
{"title":"Investigation of Track and Thermal Shock Crack Resistance in Outdoor Cycloaliphatic Electrical Insulating Materials Using Response Surface Methodology","authors":"Sadegh Ghanbar, Sedigheh Nazaripour, Marek Kornowski, Keaton Whitaker","doi":"10.1109/eic47619.2020.9158729","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158729","url":null,"abstract":"Epoxy resin samples were prepared using cycloaliphatic resin and anhydride curing agents. Response Surface Methodology (RSM) was applied to determine the effect of five independent variables (Silbond W12EST, MoldXA400, CSR, PC1000 and BYK3701) at 5 levels on the dependent variables thermal shock crack resistance (TSR) and track resistance. 33 experimental samples were prepared according to experimental design made by RSM. It was observed that not only an increase in the amount of MoldX A400 in the compound improved the tracking, but also amount Silbond W12EST had positive effect on it. The results showed that if the total filler amount in the formulation is lower than 60% the time-to-track is less than 300 min, even with using a high amount of MoldXA400 (30%). Increasing the amount of Silbond W12EST as well as core-shell toughening agent (CSR) microparticles can improve the TSR because of crack propagation inhibition caused by particles. On the other hand, an increase in MoldX A400 deteriorated TSR due to the creating weak bonds with epoxy matrix.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129408681","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158756
Mohamadreza Arab Baferani, Tohid Shahsavarian, Chuanyang Li, M. Tefferi, Ivan Jovanović, Yang Cao
In this study, electric field distribution of cable joints under steady state voltage and transient conditions, i.e. lightning impulse and polarity reversal, was investigated using electrothermal simulation. Field grading techniques including geometric grading and geometric grading with field grading materials were considered as the methods to tailor local electric field distribution based on an electro-thermal model of 80kV joint in COMSOL Multiphysics. The results show 6.5 kV/mm and 6.9 kV/mm decrease in amplitude of electric field at the critical point of the interface in presence of FGM under steady state and polarity reversal transient condition, respectively.
{"title":"Electric field tailoring in HVDC cable joints utilizing electro-thermal simulation: effect of field grading materials","authors":"Mohamadreza Arab Baferani, Tohid Shahsavarian, Chuanyang Li, M. Tefferi, Ivan Jovanović, Yang Cao","doi":"10.1109/eic47619.2020.9158756","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158756","url":null,"abstract":"In this study, electric field distribution of cable joints under steady state voltage and transient conditions, i.e. lightning impulse and polarity reversal, was investigated using electrothermal simulation. Field grading techniques including geometric grading and geometric grading with field grading materials were considered as the methods to tailor local electric field distribution based on an electro-thermal model of 80kV joint in COMSOL Multiphysics. The results show 6.5 kV/mm and 6.9 kV/mm decrease in amplitude of electric field at the critical point of the interface in presence of FGM under steady state and polarity reversal transient condition, respectively.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131116866","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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