2020 IEEE Electrical Insulation Conference (EIC)最新文献

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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>¹⁸O and ¹⁸O<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 S¹⁶O<inf>2</inf>F<inf>2</inf>, S¹⁶O¹⁸OF<inf>2</inf>, S¹⁸O<inf>2</inf>F<inf>2</inf>, S¹⁶O<inf>2</inf> and S¹⁶O¹⁸O 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}

{"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}

{"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}

{"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}