Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279484
Shihong Hu, Jie-Wang, P. Tang, Jun Zhu, Shisong Yang, Xiaobin Cao
At present, the phenomenon of corrosion of insulator on direct current (DC) transmission line is prominent, it is possible to prevent insulator from being corroded by adding a hydrophobic insulation coating on the surface of the insulator. Silicone rubber (PRTV) coatings are commonly used as hydrophobic insulation coatings, but the adhesion of PRTV coatings on the surface of insulator metal fitting is not good. The test methods for coating adhesion currently given in China are relatively simple and lack quantitative indicators. In this paper, the adhesion test methods of PRTV and polyvinylidene fluoride (PVDF) on the surface of A3 steel and hot-dip galvanized metal are studied, and to research the effect of dopamine as an intermediate adhesion promoter. First, two kinds of metal coating tests were prepared, and a pull-off test device was set up. According to the pull-off test, it was found that when different coating samples were bonded to the test metal fixture, the bonding effect was significantly different. When PRTV coating samples are bonded to test columns, need to use fast-drying cyanoacrylate adhesive, epoxy adhesive cannot effectively bond PRTV samples and fixtures. When PVDF coating samples and test columns are bonded, the adhesion of epoxy resin adhesive is much stronger than fast-drying cyanoacrylate adhesive. The experimental test results show that after dopamine is used as the intermediate adhesion layer, the adhesion of the PVDF coating on the galvanized substrate is stronger than the ungalvanized sample; the ungalvanized PVDF sample has about 2 times the adhesion improvement than the galvanized PRTV sample; Under the situation that the adhesion of ungalvanized PVDF samples is enhanced, the adhesion of galvanized PVDF samples is about 2 times higher than ungalvanized PVDF samples. It can be found that PVDF coatings have significantly improved the adhesion index compared to PRTV coatings. This article can provide a reference for the requirements of insulator coating adhesion test.
{"title":"Study of Test Method for Adhesion of Hydrophobic Insulating Coating on Insulator Metal Fitting Surface","authors":"Shihong Hu, Jie-Wang, P. Tang, Jun Zhu, Shisong Yang, Xiaobin Cao","doi":"10.1109/ICHVE49031.2020.9279484","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279484","url":null,"abstract":"At present, the phenomenon of corrosion of insulator on direct current (DC) transmission line is prominent, it is possible to prevent insulator from being corroded by adding a hydrophobic insulation coating on the surface of the insulator. Silicone rubber (PRTV) coatings are commonly used as hydrophobic insulation coatings, but the adhesion of PRTV coatings on the surface of insulator metal fitting is not good. The test methods for coating adhesion currently given in China are relatively simple and lack quantitative indicators. In this paper, the adhesion test methods of PRTV and polyvinylidene fluoride (PVDF) on the surface of A3 steel and hot-dip galvanized metal are studied, and to research the effect of dopamine as an intermediate adhesion promoter. First, two kinds of metal coating tests were prepared, and a pull-off test device was set up. According to the pull-off test, it was found that when different coating samples were bonded to the test metal fixture, the bonding effect was significantly different. When PRTV coating samples are bonded to test columns, need to use fast-drying cyanoacrylate adhesive, epoxy adhesive cannot effectively bond PRTV samples and fixtures. When PVDF coating samples and test columns are bonded, the adhesion of epoxy resin adhesive is much stronger than fast-drying cyanoacrylate adhesive. The experimental test results show that after dopamine is used as the intermediate adhesion layer, the adhesion of the PVDF coating on the galvanized substrate is stronger than the ungalvanized sample; the ungalvanized PVDF sample has about 2 times the adhesion improvement than the galvanized PRTV sample; Under the situation that the adhesion of ungalvanized PVDF samples is enhanced, the adhesion of galvanized PVDF samples is about 2 times higher than ungalvanized PVDF samples. It can be found that PVDF coatings have significantly improved the adhesion index compared to PRTV coatings. This article can provide a reference for the requirements of insulator coating adhesion test.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"22 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82812912","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279750
Kun He, Jianwei Gu, Shengxin Huang, K. Bian, Y. Ju, Weijiang Chen, Jiayu Lu
For a long time in the lightning protection design of DC lines, the effect of corona space charge has not been considered. The DC operation voltage of Changji-Guquan project is up to ±1100kV, and the impact of corona space charge may be significant. In this paper, the corona space charge distribution characteristics of this line within thundercloud electric field are studied. A mathematical model for this case is established and to improve the calculation accuracy of electric field and reduce the time and memory cost, a hybrid method of simulation charge method, finite element method (FEM) and the boundary electric field constraint equation is used to solve the Poisson equation. The upstream FEM is used to solve the continuity equations. Using the model and calculation method, the influences of the protection angle and terrain on the space charge distribution are studied. The results show that the protection angle has little effect on the surface charge density of the polar conductors, but a great one on that of ground wire and so does the slope angle. The surface charge density of the negative pole conductor increases as the increase of the slope angle and it is by about 3.8 times when slope angle is 40 degrees.
{"title":"The corona space charge distribution of Changji-Guquan ±1100kV UHVDC transmission line within the Thundercloud Electric Field","authors":"Kun He, Jianwei Gu, Shengxin Huang, K. Bian, Y. Ju, Weijiang Chen, Jiayu Lu","doi":"10.1109/ICHVE49031.2020.9279750","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279750","url":null,"abstract":"For a long time in the lightning protection design of DC lines, the effect of corona space charge has not been considered. The DC operation voltage of Changji-Guquan project is up to ±1100kV, and the impact of corona space charge may be significant. In this paper, the corona space charge distribution characteristics of this line within thundercloud electric field are studied. A mathematical model for this case is established and to improve the calculation accuracy of electric field and reduce the time and memory cost, a hybrid method of simulation charge method, finite element method (FEM) and the boundary electric field constraint equation is used to solve the Poisson equation. The upstream FEM is used to solve the continuity equations. Using the model and calculation method, the influences of the protection angle and terrain on the space charge distribution are studied. The results show that the protection angle has little effect on the surface charge density of the polar conductors, but a great one on that of ground wire and so does the slope angle. The surface charge density of the negative pole conductor increases as the increase of the slope angle and it is by about 3.8 times when slope angle is 40 degrees.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"33 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83043681","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279723
Ranzhi Zhang, Xin Lin, Jianying Zhong, Jianyuan Xu, Yongqi Yao, Jia Zhang, G. Han, Fengxaing Ma
Environmental-friendly insulating medium C5F10O has attracted wide attention due to its good insulation properties, but there are still few researches on the discharge decomposition of C5F10O. Based on density functional theory, the discharge decomposition characteristics of C5F10O are simulated in this paper. Firstly, the possible discharge decomposition paths of C5F10O are analyzed and the energy required for different decomposition paths is calculated. Secondly, the synthetic path of C5F10O decomposition products is discussed, and the energy variation of the synthesis pathway is calculated. Finally, the ionization parameters of C5F10O discharge decomposition products were calculated and the insulation properties were analyzed. The results show that the C-C bond in the molecular structure of C5F10O is the most likely to break, and the process of C5F10O discharge decomposition to form CF3CFCOCF3·and CF3· radical is the most likely to occur. In the decomposition products of C5F10O, C2F6, C5F10and CF4 are easy to be generated, while C3F6, C6F14 and C3F8are relatively difficult to be generated. The ionization energy of C5F10O discharge decomposition products is greater than 11eV, which has a strong insulating ability, certain insulation strength can be guaranteed in GIS/GIL.
{"title":"Study on Discharge Decomposition Characteristics of Environmental-friendly Insulating Medium C5F10O","authors":"Ranzhi Zhang, Xin Lin, Jianying Zhong, Jianyuan Xu, Yongqi Yao, Jia Zhang, G. Han, Fengxaing Ma","doi":"10.1109/ICHVE49031.2020.9279723","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279723","url":null,"abstract":"Environmental-friendly insulating medium C<inf>5</inf>F<inf>10</inf>O has attracted wide attention due to its good insulation properties, but there are still few researches on the discharge decomposition of C<inf>5</inf>F<inf>10</inf>O. Based on density functional theory, the discharge decomposition characteristics of C<inf>5</inf>F<inf>10</inf>O are simulated in this paper. Firstly, the possible discharge decomposition paths of C<inf>5</inf>F<inf>10</inf>O are analyzed and the energy required for different decomposition paths is calculated. Secondly, the synthetic path of C<inf>5</inf>F<inf>10</inf>O decomposition products is discussed, and the energy variation of the synthesis pathway is calculated. Finally, the ionization parameters of C<inf>5</inf>F<inf>10</inf>O discharge decomposition products were calculated and the insulation properties were analyzed. The results show that the C-C bond in the molecular structure of C<inf>5</inf>F<inf>10</inf>O is the most likely to break, and the process of C<inf>5</inf>F<inf>10</inf>O discharge decomposition to form CF<inf>3</inf>CFCOCF<inf>3</inf>·and CF<inf>3</inf>· radical is the most likely to occur. In the decomposition products of C<inf>5</inf>F<inf>10</inf>O, C2F6, C<inf>5</inf>F<inf>10</inf>and CF4 are easy to be generated, while C3F6, C6F14 and C<inf>3</inf>F<inf>8</inf>are relatively difficult to be generated. The ionization energy of C<inf>5</inf>F<inf>10</inf>O discharge decomposition products is greater than 11eV, which has a strong insulating ability, certain insulation strength can be guaranteed in GIS/GIL.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"96 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80571643","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279445
Chuangxue Zhu, Wenbin Zhao, W. Lu, Yuan Gao, Feng Li, M. Tang
Partial discharge is a common sign of insulation breakdown in power cables, which can eventually lead to serious in-service failures and expensive repairs. In practical, various measurements approaches are used to identify partial discharge problems in power cables. However, these diagnosis technologies either work in off-line condition which needs the cable to be powered off, or need many sensors and supporting equipment to be realized in on-line condition. In this paper, a motion magnification technique is presented, which allows amplified visualization of deformations on power cable caused by partial discharge. Partial discharge defects are manually created on pre-defined locations in an energized 35 kV power cable, whereas a high-resolution camera is used for the video recording in the region of interest. In order to reveal temporal vibrations on cable caused by partial discharge faults, which are difficult or impossible to be seen in videos by naked eyes of human being, spatial decomposition is applied on the video sequence, followed by temporal filtering to the frames. The vibration signal caused by partial discharge, represented by spatial signal in the video frames that drops in certain spatial-frequency bandwidth, can be collected. The resulting signal is then amplified and mapped into reconstructed video frames. Consequently, the small deformations caused by partial discharges on the cable can be identified, as well as the precise locations of the partial discharge defects. Experimental results indicate that errors in locating the partial discharge is in the order of millimeters when the distance between camera and cable ranges from 5m to 10m.
{"title":"Partial Discharge Detection, Location and Continuous Monitoring in Power Cable by Using Eulerian Video Magnification","authors":"Chuangxue Zhu, Wenbin Zhao, W. Lu, Yuan Gao, Feng Li, M. Tang","doi":"10.1109/ICHVE49031.2020.9279445","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279445","url":null,"abstract":"Partial discharge is a common sign of insulation breakdown in power cables, which can eventually lead to serious in-service failures and expensive repairs. In practical, various measurements approaches are used to identify partial discharge problems in power cables. However, these diagnosis technologies either work in off-line condition which needs the cable to be powered off, or need many sensors and supporting equipment to be realized in on-line condition. In this paper, a motion magnification technique is presented, which allows amplified visualization of deformations on power cable caused by partial discharge. Partial discharge defects are manually created on pre-defined locations in an energized 35 kV power cable, whereas a high-resolution camera is used for the video recording in the region of interest. In order to reveal temporal vibrations on cable caused by partial discharge faults, which are difficult or impossible to be seen in videos by naked eyes of human being, spatial decomposition is applied on the video sequence, followed by temporal filtering to the frames. The vibration signal caused by partial discharge, represented by spatial signal in the video frames that drops in certain spatial-frequency bandwidth, can be collected. The resulting signal is then amplified and mapped into reconstructed video frames. Consequently, the small deformations caused by partial discharges on the cable can be identified, as well as the precise locations of the partial discharge defects. Experimental results indicate that errors in locating the partial discharge is in the order of millimeters when the distance between camera and cable ranges from 5m to 10m.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"117 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83684779","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279948
D. Hou, Xuan Wang, J. Zou
Accurate soil resistivity information is an important data for designing grounding system. Due to the complexity of the geological structure, we need use various measurement and inversion methods to obtain the soil resistivity. In this paper, the soil resistivity information of stratified media is measured by using the controlled source audio frequency magnetotelluric method (CSAMT). The theory and measurement method of CSAMT are introduced firstly in this paper. According to the Cagniard apparent resistivity information, we can obtain the soil resistivity and depth information of stratified media by using some inversion method. This paper takes the results of bostick inversion as the initial model, and the optimal inversion uses the smooth constrained least square inversion method. There is no data optimization process in bostick inversion method, so its accuracy is not high. But this inversion method can better reflect the basic characteristics of geoelectric section, and can provide a reliable initial model for the accurate inversion of CSAMT data. Based on the results of bostick inversion method, the smooth constrained least square inversion method is used to get more accurate soil resistivity information. Finally, two layer model and three layer model are taken as examples. The results show that the inversion results can match well with the selected model. It can provide an accurate soil resistivity information by using this method in this paper. This inversion method also has many applications in power system, such as calculating the transmission line impedance.
{"title":"Inversion of soil resistivity by using CSAMT method","authors":"D. Hou, Xuan Wang, J. Zou","doi":"10.1109/ICHVE49031.2020.9279948","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279948","url":null,"abstract":"Accurate soil resistivity information is an important data for designing grounding system. Due to the complexity of the geological structure, we need use various measurement and inversion methods to obtain the soil resistivity. In this paper, the soil resistivity information of stratified media is measured by using the controlled source audio frequency magnetotelluric method (CSAMT). The theory and measurement method of CSAMT are introduced firstly in this paper. According to the Cagniard apparent resistivity information, we can obtain the soil resistivity and depth information of stratified media by using some inversion method. This paper takes the results of bostick inversion as the initial model, and the optimal inversion uses the smooth constrained least square inversion method. There is no data optimization process in bostick inversion method, so its accuracy is not high. But this inversion method can better reflect the basic characteristics of geoelectric section, and can provide a reliable initial model for the accurate inversion of CSAMT data. Based on the results of bostick inversion method, the smooth constrained least square inversion method is used to get more accurate soil resistivity information. Finally, two layer model and three layer model are taken as examples. The results show that the inversion results can match well with the selected model. It can provide an accurate soil resistivity information by using this method in this paper. This inversion method also has many applications in power system, such as calculating the transmission line impedance.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"68 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83382916","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279530
Zheng Wei, Yong Yang, M. Li, Jichao Fan, Yan Shi, Weibing Wen, Jialong Wang
DC circuit breaker (DCB) is the core equipment of high voltage DC (HVDC) grid based on voltage source converter (VSC). However DCB absorbs huge energy by metal oxide arrester (MOA) in it when breaking short circuit current. The overlarge energy will easily result in damage of MOA and badly limited the application of DCB. To solve this problem, this paper studies the mechanism of MOA of DCB absorbing energy after the most severe fault, the pole-to-pole fault, of VSC-HVDC grid. The theoretical calculation method of MOA energy stress of DCB is presented. A new protection strategy is provided to suppress MOA energy stress without adding any extra equipment. The actual 4-side VSC-HVDC grid is modelled and simulated based on PSCAD/EMTDC to verify the theoretical analysis results. The calculation results show that compared with the original strategy, the MOA energy stress of DCB can be reduced from 254.5MJ to 145.6MJ by using the new strategy.
{"title":"Study on Energy Stress of DC Circuit Breakers after Pole-to-pole Fault of VSC-HVDC Grid","authors":"Zheng Wei, Yong Yang, M. Li, Jichao Fan, Yan Shi, Weibing Wen, Jialong Wang","doi":"10.1109/ICHVE49031.2020.9279530","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279530","url":null,"abstract":"DC circuit breaker (DCB) is the core equipment of high voltage DC (HVDC) grid based on voltage source converter (VSC). However DCB absorbs huge energy by metal oxide arrester (MOA) in it when breaking short circuit current. The overlarge energy will easily result in damage of MOA and badly limited the application of DCB. To solve this problem, this paper studies the mechanism of MOA of DCB absorbing energy after the most severe fault, the pole-to-pole fault, of VSC-HVDC grid. The theoretical calculation method of MOA energy stress of DCB is presented. A new protection strategy is provided to suppress MOA energy stress without adding any extra equipment. The actual 4-side VSC-HVDC grid is modelled and simulated based on PSCAD/EMTDC to verify the theoretical analysis results. The calculation results show that compared with the original strategy, the MOA energy stress of DCB can be reduced from 254.5MJ to 145.6MJ by using the new strategy.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"63 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83443709","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279619
Zhengming Chen, Yan Wang, Qingshuai Wu, Kun Han, Youhe Wang, Tailong Lv
Submarine cables are used in 500kV power transmission station. Insulating fluid was filled into the cables to protect them. There is a set of insulating fluid pumping station in Nanling and Linshi. The corresponding control systems were equipped to achieve the automatic control of insulating fluid pumping station in Nanling and Linshi. The control systems could meet different operating conditions. The rate and the pressure of the flow could be changed according to the set values by the control systems. The send-out and take-back of the Insulating fluid in Nanling and Linshi can be alternated by the control systems. The cables could be protected from seawater if the cables were damaged. The operation information could be sent to Fuzhou control center. The control system is built with the ControlLogix controller of AB. Different modules were used to collect signals according to different equipment types on site. The signals should be calculated, analyzed and optimized. The operations of the submarine cables could be acquainted according to the signals. The rate and direction of the Insulating fluid flow could be changed by the control system by starting or stopping the pump. Insulating fluid pressure at the outlet of submarine cable was maintained in the relative range and Insulating fluid flow remains at maximum in normal operation mode. Insulating fluid pressure at the outlet of submarine cable was maintained Above the minimum and Insulating fluid flow Decrease from maximum to the minimum In Emergency mode. The control system could meet the daily operation requirements of submarine cable stably after monitoring and recording long- term operation of the system. It could alert when the oil pump system was abnormal.it can protect the submarine cable from the seawater In emergency mode and the Insulating fluid would be the minimum to protect the environment.
{"title":"Research and development of control system for submarine cable pumping station","authors":"Zhengming Chen, Yan Wang, Qingshuai Wu, Kun Han, Youhe Wang, Tailong Lv","doi":"10.1109/ICHVE49031.2020.9279619","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279619","url":null,"abstract":"Submarine cables are used in 500kV power transmission station. Insulating fluid was filled into the cables to protect them. There is a set of insulating fluid pumping station in Nanling and Linshi. The corresponding control systems were equipped to achieve the automatic control of insulating fluid pumping station in Nanling and Linshi. The control systems could meet different operating conditions. The rate and the pressure of the flow could be changed according to the set values by the control systems. The send-out and take-back of the Insulating fluid in Nanling and Linshi can be alternated by the control systems. The cables could be protected from seawater if the cables were damaged. The operation information could be sent to Fuzhou control center. The control system is built with the ControlLogix controller of AB. Different modules were used to collect signals according to different equipment types on site. The signals should be calculated, analyzed and optimized. The operations of the submarine cables could be acquainted according to the signals. The rate and direction of the Insulating fluid flow could be changed by the control system by starting or stopping the pump. Insulating fluid pressure at the outlet of submarine cable was maintained in the relative range and Insulating fluid flow remains at maximum in normal operation mode. Insulating fluid pressure at the outlet of submarine cable was maintained Above the minimum and Insulating fluid flow Decrease from maximum to the minimum In Emergency mode. The control system could meet the daily operation requirements of submarine cable stably after monitoring and recording long- term operation of the system. It could alert when the oil pump system was abnormal.it can protect the submarine cable from the seawater In emergency mode and the Insulating fluid would be the minimum to protect the environment.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89691557","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279930
Xiaoming Wang, Xiangyu Lin, Ke Zhou, Yu-feng Lu
High voltage circuit breaker is a critical equipment of power system. It is very important to ensure the circuit breaker to operate in a normal state. According to statistics, most defect and fault of high voltage circuit breaker is caused by mechanical faults. In this research, the sound and current signals were collected in the simulation experiment of typical mechanical faults, namely iron core jam, two kinds of tripping mechanism faults, and spring fatigue. Then the signals were down sampled, flipped and stacked to fit deep learning model. A convolution neural network (CNN) model consisting eight layers was developed to extract features and categorize faults from the pre-processed signals. The results indicate that the mechanical fault diagnosis accuracy rate is up to 94%, higher than conventional methods using sound or current signal.
{"title":"CNN based Mechanical Fault Diagnosis of High Voltage Circuit Breaker using Sound and Current Signal","authors":"Xiaoming Wang, Xiangyu Lin, Ke Zhou, Yu-feng Lu","doi":"10.1109/ICHVE49031.2020.9279930","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279930","url":null,"abstract":"High voltage circuit breaker is a critical equipment of power system. It is very important to ensure the circuit breaker to operate in a normal state. According to statistics, most defect and fault of high voltage circuit breaker is caused by mechanical faults. In this research, the sound and current signals were collected in the simulation experiment of typical mechanical faults, namely iron core jam, two kinds of tripping mechanism faults, and spring fatigue. Then the signals were down sampled, flipped and stacked to fit deep learning model. A convolution neural network (CNN) model consisting eight layers was developed to extract features and categorize faults from the pre-processed signals. The results indicate that the mechanical fault diagnosis accuracy rate is up to 94%, higher than conventional methods using sound or current signal.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76784779","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}
In engineering practice, the status evaluation of isolating switches is often carried out, and intelligent operation and maintenance are carried out based on the results of the status evaluation. It is necessary to master the basic information such as the defect rate and main defect modes of isolating switches. Based on the statistics of the isolation switches, the isolating switches are classified according to the structure, and the quantity and defect rate of different types of isolation switch under the voltage level of 110kV, 220kV and 500kV are calculated respectively. Then the parts of the isolation switch are divided, the types and proportions of defects in each part of the isolation switch are counted, and the defect information of the isolation switch is summarized from various aspects. Finally, it is found that although the defect rate of the isolating switches will be different due to different structures and voltage levels, the mechanism box is always the component with the largest defect proportion of the isolating switches, and the defect modes are diverse. The defect proportion of other components is relatively low and the defect type is relatively single.
{"title":"Statistical analysis of defect modes and defect rate of isolating switches","authors":"Zhifeng Liu, Yangchun Cheng, Qingzhu Yang, Feiran Li, Wei Chi, Wei Wang","doi":"10.1109/ICHVE49031.2020.9279866","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279866","url":null,"abstract":"In engineering practice, the status evaluation of isolating switches is often carried out, and intelligent operation and maintenance are carried out based on the results of the status evaluation. It is necessary to master the basic information such as the defect rate and main defect modes of isolating switches. Based on the statistics of the isolation switches, the isolating switches are classified according to the structure, and the quantity and defect rate of different types of isolation switch under the voltage level of 110kV, 220kV and 500kV are calculated respectively. Then the parts of the isolation switch are divided, the types and proportions of defects in each part of the isolation switch are counted, and the defect information of the isolation switch is summarized from various aspects. Finally, it is found that although the defect rate of the isolating switches will be different due to different structures and voltage levels, the mechanism box is always the component with the largest defect proportion of the isolating switches, and the defect modes are diverse. The defect proportion of other components is relatively low and the defect type is relatively single.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"165 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76906961","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 : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279780
Z. Tang, Z. Cao
Due to the lack of expert experience and the shortcomings of high blindness, the traditional partial discharge feature extraction method of gas insulated switchgear (GIS) has an impact on the accuracy of pattern recognition; convolutional neural network emerged in recent years has the ability to adaptively extract features, but training a network with better performance needs to increase the network depth on the one hand, and more supportive data on the other. Therefore, this paper propose a GIS partial discharge pattern recognition method based on transfer learning of three pre-trained network models (VGG, InceptionV3, and Resnet50) under the small data set. And the feature extracted by the network are applied to SVM classifier which performs well on a small data set. Realizing the combination of deep learning and traditional machine learning. Experimental result shows that this method can effectively improve the accuracy of GIS partial discharge pattern recognition.
{"title":"Application of Convolutional Neural Network Transfer Learning in Partial Discharge Pattern Recognition","authors":"Z. Tang, Z. Cao","doi":"10.1109/ICHVE49031.2020.9279780","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279780","url":null,"abstract":"Due to the lack of expert experience and the shortcomings of high blindness, the traditional partial discharge feature extraction method of gas insulated switchgear (GIS) has an impact on the accuracy of pattern recognition; convolutional neural network emerged in recent years has the ability to adaptively extract features, but training a network with better performance needs to increase the network depth on the one hand, and more supportive data on the other. Therefore, this paper propose a GIS partial discharge pattern recognition method based on transfer learning of three pre-trained network models (VGG, InceptionV3, and Resnet50) under the small data set. And the feature extracted by the network are applied to SVM classifier which performs well on a small data set. Realizing the combination of deep learning and traditional machine learning. Experimental result shows that this method can effectively improve the accuracy of GIS partial discharge pattern recognition.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"90 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78093648","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：