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}
Pub Date : 2020-06-01DOI: 10.1109/eic47619.2020.9158666
S. Takenouchi, Y. Nishigaki, T. Matsuzoe, M. Kozako, Masayuki Hikita Kyushu, N. Fujimoto, N. Hayashizaka, Toshihiko Kato, Hideyuki Hideyuki
This paper presents partial discharge (PD) degradation and life characteristics of enamel twisted pair coated with nano-boehmite (AIOOH) filler added polyimide (PI) layer under bipolar repetitive impulse voltage application for developing surge resistant winding that exceeds the conventional insulation life. An attempt is also made to compare thus obtained results with those for additive-free PI sample (PI neat). An electric circuit using a capacitance connected in series with a sample was constructed to measure PD charge till breakdown (BD). Experimental results revealed the time to breakdown of boehmite/PI extended over that of PI neat, while the average PD charge increased with time and then dropped after the peak, leading to BD. This result was interpreted by the erosion suppression effect of the boehmite filler accumulating on the layer surface due to PD degradation.
{"title":"Partial Discharge Properties till Breakdown of Boehmite Added Enameled Twisted Pair under Bipolar Repetitive Impulse Voltage Application","authors":"S. Takenouchi, Y. Nishigaki, T. Matsuzoe, M. Kozako, Masayuki Hikita Kyushu, N. Fujimoto, N. Hayashizaka, Toshihiko Kato, Hideyuki Hideyuki","doi":"10.1109/eic47619.2020.9158666","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158666","url":null,"abstract":"This paper presents partial discharge (PD) degradation and life characteristics of enamel twisted pair coated with nano-boehmite (AIOOH) filler added polyimide (PI) layer under bipolar repetitive impulse voltage application for developing surge resistant winding that exceeds the conventional insulation life. An attempt is also made to compare thus obtained results with those for additive-free PI sample (PI neat). An electric circuit using a capacitance connected in series with a sample was constructed to measure PD charge till breakdown (BD). Experimental results revealed the time to breakdown of boehmite/PI extended over that of PI neat, while the average PD charge increased with time and then dropped after the peak, leading to BD. This result was interpreted by the erosion suppression effect of the boehmite filler accumulating on the layer surface due to PD degradation.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"26 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":"125638878","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/eic47619.2020.9158678
Min Zhang, Ran Zhang, M. Jin, Zhibing Li, Rui Zhang, Bin Lyu, Tao Wen
SF6/N2 mixed gas, as a typical binary mixed gas with synergistic effect, is a simple and effective SF6 environmental protection measure. It has been gradually applied to gas-insulated power equipment such as GIS. In order to develop a mixed-gas 126 kV GIS disconnecting switch, breaking characteristics under typical operation conditions are carried out. A circuit breaking test for bus-transfor current was established, and a bus-transfor current breaking test was carried out. It was found that under different conditions, the arc time of the mixed gas was significantly longer than that of SF6. Under the condition of 30V/1600A, the arc time of 28% mixed gas is increased by about 29% compared with SF6. The arcing time of the mixed gas with 40% mixing ratio is similar. The arcing time will increase when the gas pressure decreases. The operation speed of the disconnecting switch has a small effect on the breaking. After 100 tests, the contactor was slightly ablated after the 30V/1600A test but still passed the test. However, the contactor was severely ablated under the 100V/1600A breaking condition and failed the test. A small capacitive current breaking test circuit was set up, and a small capacitive current breaking test was carried out. It is found that the mixing ratio, gas pressure, and switching operation speed have the same effect on the arcing time as the bus-transfor current breaking test. Compared with SF6, the breaking performance is significantly reduced. The arcing time of 28% mixed gas in the 126kV test is increased by about 25%. No insulation discharge occurred after 50 tests, and it was judged that the test passed. In summary, the breaking performance of the mixed gas is significantly lower than SF6, which will make the arcing time and the contactor ablation increase, and even the breaking failure. An improved method of adding copper-tungsten arcing contactor was proposed, after which the test sample was improved, and the type test was passed.
{"title":"Study on Breaking Characteristics of SF6/N2 Gas Mixtures GIS Disconnecting Switch","authors":"Min Zhang, Ran Zhang, M. Jin, Zhibing Li, Rui Zhang, Bin Lyu, Tao Wen","doi":"10.1109/eic47619.2020.9158678","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158678","url":null,"abstract":"SF6/N2 mixed gas, as a typical binary mixed gas with synergistic effect, is a simple and effective SF6 environmental protection measure. It has been gradually applied to gas-insulated power equipment such as GIS. In order to develop a mixed-gas 126 kV GIS disconnecting switch, breaking characteristics under typical operation conditions are carried out. A circuit breaking test for bus-transfor current was established, and a bus-transfor current breaking test was carried out. It was found that under different conditions, the arc time of the mixed gas was significantly longer than that of SF6. Under the condition of 30V/1600A, the arc time of 28% mixed gas is increased by about 29% compared with SF6. The arcing time of the mixed gas with 40% mixing ratio is similar. The arcing time will increase when the gas pressure decreases. The operation speed of the disconnecting switch has a small effect on the breaking. After 100 tests, the contactor was slightly ablated after the 30V/1600A test but still passed the test. However, the contactor was severely ablated under the 100V/1600A breaking condition and failed the test. A small capacitive current breaking test circuit was set up, and a small capacitive current breaking test was carried out. It is found that the mixing ratio, gas pressure, and switching operation speed have the same effect on the arcing time as the bus-transfor current breaking test. Compared with SF6, the breaking performance is significantly reduced. The arcing time of 28% mixed gas in the 126kV test is increased by about 25%. No insulation discharge occurred after 50 tests, and it was judged that the test passed. In summary, the breaking performance of the mixed gas is significantly lower than SF6, which will make the arcing time and the contactor ablation increase, and even the breaking failure. An improved method of adding copper-tungsten arcing contactor was proposed, after which the test sample was improved, and the type test was passed.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"9 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":"133391541","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/eic47619.2020.9158684
Yangchun Cheng, Li Zhao, Xu-tao Wu, H. Ni, Pei Ding, Xiuguang Li, Xiu Zhou
High voltage XLPE cable has become the mainstream of power transmission equipment. At present, the application experience of cable condition diagnosis technology is insufficient, and there is still room for improvement in key issues such as technical limitations, application methods, detection cycle and evaluation criteria. Therefore, it is very important to get more accurate cable condition evaluation criteria by statistical analysis of cable faults. In this paper, the partial discharge fault of cable is analyzed. First of all, the guidelines and regulations of existing cables in China are studied, and the standards related to partial discharge and temperature in current cable condition evaluation are understood. Secondly, the typical cable fault cases are collected, the partial discharge data of the fault cable is recorded, and its distribution form is obtained. Finally, on the basis of the above research work, a calculation method of conditional fault probability of cable under given local discharge amplitude is proposed, which can reflect the severity of partial discharge fault of high voltage cable to a certain extent.
{"title":"Statistical Analysis of Partial Discharge Faults of HV Cables","authors":"Yangchun Cheng, Li Zhao, Xu-tao Wu, H. Ni, Pei Ding, Xiuguang Li, Xiu Zhou","doi":"10.1109/eic47619.2020.9158684","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158684","url":null,"abstract":"High voltage XLPE cable has become the mainstream of power transmission equipment. At present, the application experience of cable condition diagnosis technology is insufficient, and there is still room for improvement in key issues such as technical limitations, application methods, detection cycle and evaluation criteria. Therefore, it is very important to get more accurate cable condition evaluation criteria by statistical analysis of cable faults. In this paper, the partial discharge fault of cable is analyzed. First of all, the guidelines and regulations of existing cables in China are studied, and the standards related to partial discharge and temperature in current cable condition evaluation are understood. Secondly, the typical cable fault cases are collected, the partial discharge data of the fault cable is recorded, and its distribution form is obtained. Finally, on the basis of the above research work, a calculation method of conditional fault probability of cable under given local discharge amplitude is proposed, which can reflect the severity of partial discharge fault of high voltage cable to a certain extent.","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":"115982698","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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