In the field of electrical insulation, using microcapsules technology to prepare self-healing insulation materials is a new research field. This paper explores the preparation method of self-healing low density polyethylene (LDPE)/microcapsule insulation material, analyzes the influence of microcapsules with different concentrations on space charge characteristics of LDPE on the basis of the verification of self-healing characteristics. The results show that by doping microcapsules into the material, the goal of self-healing can be achieved and the space charge characteristics of the material can be improved, but it also results in slight disadvantages in other electrical characteristics, such as the accumulation of space charge, the increase in the decay rate of space charge. On the whole, when the concentration of microcapsules is 1wt%, the self-healing performance and space charge characteristics of composite materials are superior. The change of characteristics is mainly related to the characteristics of microcapsules themselves and the interfaces and charge traps they introduced. The microcapsules have influence on the polarization of the LDPE, thus affect the space charge characteristics of the insulation materials.
{"title":"Research on Space Charge Characteristics of LDPE/Microcapsule Self-healing Insulation Material","authors":"Yunqi Li, Youyuan Wang, Yudong Li, Yanfang Zhang, Adnan Yaseen","doi":"10.1109/ICEMPE51623.2021.9509184","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509184","url":null,"abstract":"In the field of electrical insulation, using microcapsules technology to prepare self-healing insulation materials is a new research field. This paper explores the preparation method of self-healing low density polyethylene (LDPE)/microcapsule insulation material, analyzes the influence of microcapsules with different concentrations on space charge characteristics of LDPE on the basis of the verification of self-healing characteristics. The results show that by doping microcapsules into the material, the goal of self-healing can be achieved and the space charge characteristics of the material can be improved, but it also results in slight disadvantages in other electrical characteristics, such as the accumulation of space charge, the increase in the decay rate of space charge. On the whole, when the concentration of microcapsules is 1wt%, the self-healing performance and space charge characteristics of composite materials are superior. The change of characteristics is mainly related to the characteristics of microcapsules themselves and the interfaces and charge traps they introduced. The microcapsules have influence on the polarization of the LDPE, thus affect the space charge characteristics of the insulation materials.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"34 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89472581","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509143
Suwen Chen, Gan Du, Q. Xie, Guanglei Qu
Power transformer is the key equipment in the power system. In recent years, transformer explosion occurred frequently, most of which caused fire and resulted in heavy losses. Research in this field is still in the initial stage. To analyze the anti-explosion performance of transformers, an equivalent load model for transformer arc fault is firstly proposed in this paper, and the relevant numerical simulation is carried out. Fluid-structure interaction is considered in the numerical simulation, and finally the load distribution field and the structural response characteristics of the transformer are obtained for two typical arc fault locations.
{"title":"A Preliminary Study on Anti-explosion Performance of UHV Transformer","authors":"Suwen Chen, Gan Du, Q. Xie, Guanglei Qu","doi":"10.1109/ICEMPE51623.2021.9509143","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509143","url":null,"abstract":"Power transformer is the key equipment in the power system. In recent years, transformer explosion occurred frequently, most of which caused fire and resulted in heavy losses. Research in this field is still in the initial stage. To analyze the anti-explosion performance of transformers, an equivalent load model for transformer arc fault is firstly proposed in this paper, and the relevant numerical simulation is carried out. Fluid-structure interaction is considered in the numerical simulation, and finally the load distribution field and the structural response characteristics of the transformer are obtained for two typical arc fault locations.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"45 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73251319","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509102
Zhihui Wang, Yong Liu, Xianghuan Kong, Qiran Li, Xingwang Huang, B. Du
10kV overhead transmission lines are easy to be affected by severe weather conditions such as strong wind and icing, which is prone to galloping fault. This seriously affects the safety and reliability of distribution network. For the galloping characteristics of 10kV overhead transmission line in severe weather conditions, ANSYS finite element analysis software is used for simulation calculations. The static and dynamic characteristics of overhead line under different conditions are obtained. The simulation results show that the deformation of overhead line is not only related to the wind level, but also the direction of wind blowing to the overhead line. The main reason for galloping of the overhead line is the wind load. Icing makes the galloping characteristics of overhead lines more obvious, but the galloping of overhead lines may still occur when there is no ice. The conclusion of this simulation is helpful to grasp the operation characteristics of 10kV overhead transmission lines in severe weather (icing, strong wind). It also can provide reference for the design, on-line monitoring and early warning of the overhead lines.
{"title":"Galloping Characteristics of 10kV Overhead Transmission Line Using Finite Element Analysis Method","authors":"Zhihui Wang, Yong Liu, Xianghuan Kong, Qiran Li, Xingwang Huang, B. Du","doi":"10.1109/ICEMPE51623.2021.9509102","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509102","url":null,"abstract":"10kV overhead transmission lines are easy to be affected by severe weather conditions such as strong wind and icing, which is prone to galloping fault. This seriously affects the safety and reliability of distribution network. For the galloping characteristics of 10kV overhead transmission line in severe weather conditions, ANSYS finite element analysis software is used for simulation calculations. The static and dynamic characteristics of overhead line under different conditions are obtained. The simulation results show that the deformation of overhead line is not only related to the wind level, but also the direction of wind blowing to the overhead line. The main reason for galloping of the overhead line is the wind load. Icing makes the galloping characteristics of overhead lines more obvious, but the galloping of overhead lines may still occur when there is no ice. The conclusion of this simulation is helpful to grasp the operation characteristics of 10kV overhead transmission lines in severe weather (icing, strong wind). It also can provide reference for the design, on-line monitoring and early warning of the overhead lines.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"143 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73379558","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509127
Chao Wang, Wen-Dong Li, Zhi-hui Jiang, Hao Yin, Xiong Yang, Guanjun Zhang, Yifan Zhang, M. Fu, B. Luo
To reduce the usage of SF6gas, downsize equipment's volume, and enhance basin-type spacers' electrical and mechanical performance in gas insulated metal enclosed switchgear (GIS), compact design of spacer based on finite element method is conducted. In the context of reducing 15% insulation distance, electrical and mechanical properties can be improved by optimizing spacer's structure and dielectric properties distribution concurrently. Local concentrated mechanical stress and deformation amount under the pressure of 2.4 MPa are relieved. Besides, surface electric field is well-distributed by adjusting spacer's profiles, thickness at two terminals, and permittivity distribution at the region nearby the flange, resulting in ideal reverse “U” shape distribution. Comparing with original insulation system, structure after compact design shows approximately 20% decrease of SF6 usage amount and 11.9% reduction of epoxy composite weight. Moreover, the maximum electric field intensity along the convex or concave, and the maximum deformation of spacer could decrease by 17.0%, 21.2%, and 29.9%, respectively. This design strategy for GIS insulation system takes both electrical and mechanical properties into account, and exhibits significant improvement of comprehensive performance of spacer.
{"title":"Compact Design for 550 kV GIS Insulation System","authors":"Chao Wang, Wen-Dong Li, Zhi-hui Jiang, Hao Yin, Xiong Yang, Guanjun Zhang, Yifan Zhang, M. Fu, B. Luo","doi":"10.1109/ICEMPE51623.2021.9509127","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509127","url":null,"abstract":"To reduce the usage of SF6gas, downsize equipment's volume, and enhance basin-type spacers' electrical and mechanical performance in gas insulated metal enclosed switchgear (GIS), compact design of spacer based on finite element method is conducted. In the context of reducing 15% insulation distance, electrical and mechanical properties can be improved by optimizing spacer's structure and dielectric properties distribution concurrently. Local concentrated mechanical stress and deformation amount under the pressure of 2.4 MPa are relieved. Besides, surface electric field is well-distributed by adjusting spacer's profiles, thickness at two terminals, and permittivity distribution at the region nearby the flange, resulting in ideal reverse “U” shape distribution. Comparing with original insulation system, structure after compact design shows approximately 20% decrease of SF6 usage amount and 11.9% reduction of epoxy composite weight. Moreover, the maximum electric field intensity along the convex or concave, and the maximum deformation of spacer could decrease by 17.0%, 21.2%, and 29.9%, respectively. This design strategy for GIS insulation system takes both electrical and mechanical properties into account, and exhibits significant improvement of comprehensive performance of spacer.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"117 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73381367","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509093
Qi Li, Yan Dai, R. Han, Donglian Qi, Yunfeng Yan
Gas-insulated switchgear (GIS), as an important high-voltage equipment in a substation, is extremely important to the normal operation of the substation. There are many SF6 pointer meters in the GIS room to monitor the insulating medium, SF6 gas, in the closed metal pipeline. However, since many meters are located at a height of 4-5 meters, it is not conducive to manual or robot inspection. Therefore, in order to solve the problem of inspection of SF6 meters at high places, the article proposes to use a multi-rotor Unmanned Aerial Vehicle(UAV) with strong maneuverability and high flexibility for inspection. The inspection system designed in this paper is based on the secondary development of the DJI Mavic2 UAV platform, and uses Apriltag to achieve accurate indoor positioning of the UAV. At the same time, it combines the meter recognition algorithm based on key point detection to automatically read the meters. Finally, the autonomous inspection of SF6 meters in the GIS room based on the multi-rotor UAV is realized. Through testing in the substation, the practicability of the inspection system is verified.
{"title":"GIS Room Autonomous Inspection System Based on Multi-rotor UAV","authors":"Qi Li, Yan Dai, R. Han, Donglian Qi, Yunfeng Yan","doi":"10.1109/ICEMPE51623.2021.9509093","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509093","url":null,"abstract":"Gas-insulated switchgear (GIS), as an important high-voltage equipment in a substation, is extremely important to the normal operation of the substation. There are many SF6 pointer meters in the GIS room to monitor the insulating medium, SF6 gas, in the closed metal pipeline. However, since many meters are located at a height of 4-5 meters, it is not conducive to manual or robot inspection. Therefore, in order to solve the problem of inspection of SF6 meters at high places, the article proposes to use a multi-rotor Unmanned Aerial Vehicle(UAV) with strong maneuverability and high flexibility for inspection. The inspection system designed in this paper is based on the secondary development of the DJI Mavic2 UAV platform, and uses Apriltag to achieve accurate indoor positioning of the UAV. At the same time, it combines the meter recognition algorithm based on key point detection to automatically read the meters. Finally, the autonomous inspection of SF6 meters in the GIS room based on the multi-rotor UAV is realized. Through testing in the substation, the practicability of the inspection system is verified.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"34 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75718086","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}
The corrosion status of transmission line towers is difficult to detect. Once corrosion damage occurs, it will not only cause equipment and facilities to fail prematurely, be scrapped, and shorten their lifespan, but also cause significant economic losses, and even cause serious personal injuries. Traditional detection methods such as weightlessness method need to destroy the material structure, which is cumbersome to operate on site. This paper proposes a non-contact identification method based on hyperspectral technology for carbon steel corrosion grade of transmission towers. Collect hyperspectral images of carbon steel samples of different corrosion grades, use the pre-processed full-band spectral data to establish the K-nearest neighbor algorithm (KNN) model and the partial least squares discriminant analysis (PLS-DA) model. It is found through comparison that PLS-DA model classification effect is better. Through competitive adaptive reweighted sampling algorithm (CARS) and principal component analysis (PCA), the full-band spectral data of different corrosion grade carbon steel samples were extracted, and a PLS-DA model based on the optimal band was established. The results show that the use of characteristic waveband modeling greatly reduces the interference of redundant information, and the classification accuracy is better than that of the full waveband. The PLS-DA model based on the characteristic waveband has an accuracy of 95% for the classification of different corrosion levels in the verification set. Therefore, this method can be applied to the non-destructive and rapid detection of the corrosion level of carbon steel, and provides a new idea for the identification of the corrosion level of carbon steel in transmission towers.
{"title":"Non-contact Identification Method for Carbon Steel Corrosion Grade of Transmission Tower Based on Hyperspectral Technology","authors":"Kun Yang, Chaoqun Shi, Yujun Guo, Xueqin Zhang, Chunmao Li, Guangning Wu","doi":"10.1109/ICEMPE51623.2021.9509165","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509165","url":null,"abstract":"The corrosion status of transmission line towers is difficult to detect. Once corrosion damage occurs, it will not only cause equipment and facilities to fail prematurely, be scrapped, and shorten their lifespan, but also cause significant economic losses, and even cause serious personal injuries. Traditional detection methods such as weightlessness method need to destroy the material structure, which is cumbersome to operate on site. This paper proposes a non-contact identification method based on hyperspectral technology for carbon steel corrosion grade of transmission towers. Collect hyperspectral images of carbon steel samples of different corrosion grades, use the pre-processed full-band spectral data to establish the K-nearest neighbor algorithm (KNN) model and the partial least squares discriminant analysis (PLS-DA) model. It is found through comparison that PLS-DA model classification effect is better. Through competitive adaptive reweighted sampling algorithm (CARS) and principal component analysis (PCA), the full-band spectral data of different corrosion grade carbon steel samples were extracted, and a PLS-DA model based on the optimal band was established. The results show that the use of characteristic waveband modeling greatly reduces the interference of redundant information, and the classification accuracy is better than that of the full waveband. The PLS-DA model based on the characteristic waveband has an accuracy of 95% for the classification of different corrosion levels in the verification set. Therefore, this method can be applied to the non-destructive and rapid detection of the corrosion level of carbon steel, and provides a new idea for the identification of the corrosion level of carbon steel in transmission towers.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"58 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78640581","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}
The effect of thermal aging on the insulation performance of XLPE cables is studied using a new diagnosis technique-direct current integrated charge (DCIC-Q(t)). The influence process of thermal aging on crosslinked polyethylene (XLPE) and the measuring principle of DCIC-Q(t) were described. Several thermal aged XLPE cables were obtained for DCIC-Q(t) experiments. The dynamic charge curve of cables under different thermal aging conditions is obtained, and charge ratio $R$ is proposed to compare the charge injection and accumulation. The permittivity $varepsilon_{r}$ and conductivity $gamma$ of XLPE insulation are calculated to analyze the aging level of XLPE cable insulation. It can be concluded that this technique can be useful to monitor the aging of the full-sized cable and has potential to applying in other insulation system.
{"title":"Study on Insulation Performance of Thermal Aging XLPE Cables by Direct Current Integrated Charge Technique","authors":"Bingrong Huang, Weiwang Wang, Shengtao Li, Xinyuan Li, Yongjie Nie, Yunkun Deng, Qihang Jiang","doi":"10.1109/ICEMPE51623.2021.9509116","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509116","url":null,"abstract":"The effect of thermal aging on the insulation performance of XLPE cables is studied using a new diagnosis technique-direct current integrated charge (DCIC-Q(t)). The influence process of thermal aging on crosslinked polyethylene (XLPE) and the measuring principle of DCIC-Q(t) were described. Several thermal aged XLPE cables were obtained for DCIC-Q(t) experiments. The dynamic charge curve of cables under different thermal aging conditions is obtained, and charge ratio $R$ is proposed to compare the charge injection and accumulation. The permittivity $varepsilon_{r}$ and conductivity $gamma$ of XLPE insulation are calculated to analyze the aging level of XLPE cable insulation. It can be concluded that this technique can be useful to monitor the aging of the full-sized cable and has potential to applying in other insulation system.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"19 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78782057","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509156
Xiaobin Cao, Yufeng Yang, Tao Li, Chenxia Gao, P. Tang, Yawei Li
Electrical corrosion of fittings is a persistent problem of porcelain and glass insulators on HVDC transmission lines. In order to study the microscopic process of the corrosion of insulator fittings in DC transmission lines and reveal the key factors for the corrosion of insulator fittings under the action of a strong DC electric field, this paper established the bottom glass experimental model and the bottom ceramic sheet experimental model under bar board voltage, and built a proportional simulation model to analyze the voltage distribution of the corresponding material. The test principle of the experimental model of the bottom glass under the pressure of the rod plate is based on the depolarization potential detection method. The sample solution of different concentrations is pressurized for different times. After short-circuiting, the relationship between the residual voltage at both ends of the electrode and time is measured and analyzed the influence of an external DC electric field on the depolarization potential of the rod-plate electrode. The test principle of the experimental model of the bottom ceramic sheet under the pressure of the rod plate is based on the external electric field affecting the ion migration in the solution, and the ion migration in the solution will cause the local concentration to change, and the conductivity of the electrolyte solution is related to the concentration of the solution. The relationship between the electric field and the conductivity of the solution, and the mechanism of the applied electric field on ion migration is analyzed. The experimental results show that under the action of a DC electric field, the depolarization potential at both ends of the rod-plate electrode connected to the sample will change with the applied voltage time, but the change trend is the same. There is ion migration in the solution; under the action of the DC electric field, Different pressurization time will cause the internal conductivity of the solution to change.
{"title":"Analysis of Microscopic Process of Insulator Fittings for DC Transmission Lines","authors":"Xiaobin Cao, Yufeng Yang, Tao Li, Chenxia Gao, P. Tang, Yawei Li","doi":"10.1109/ICEMPE51623.2021.9509156","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509156","url":null,"abstract":"Electrical corrosion of fittings is a persistent problem of porcelain and glass insulators on HVDC transmission lines. In order to study the microscopic process of the corrosion of insulator fittings in DC transmission lines and reveal the key factors for the corrosion of insulator fittings under the action of a strong DC electric field, this paper established the bottom glass experimental model and the bottom ceramic sheet experimental model under bar board voltage, and built a proportional simulation model to analyze the voltage distribution of the corresponding material. The test principle of the experimental model of the bottom glass under the pressure of the rod plate is based on the depolarization potential detection method. The sample solution of different concentrations is pressurized for different times. After short-circuiting, the relationship between the residual voltage at both ends of the electrode and time is measured and analyzed the influence of an external DC electric field on the depolarization potential of the rod-plate electrode. The test principle of the experimental model of the bottom ceramic sheet under the pressure of the rod plate is based on the external electric field affecting the ion migration in the solution, and the ion migration in the solution will cause the local concentration to change, and the conductivity of the electrolyte solution is related to the concentration of the solution. The relationship between the electric field and the conductivity of the solution, and the mechanism of the applied electric field on ion migration is analyzed. The experimental results show that under the action of a DC electric field, the depolarization potential at both ends of the rod-plate electrode connected to the sample will change with the applied voltage time, but the change trend is the same. There is ion migration in the solution; under the action of the DC electric field, Different pressurization time will cause the internal conductivity of the solution to change.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"18 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80639138","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}
The three-phase composite structure is widely used in the power industry, especially for insulation systems of power equipment. As delamination defects always take place on such equipment, i.e. defects occur inside the three-phase composite structure. Therefore, this paper proposes to used the terahertz time-domain spectroscopy (THz-TDS) to detect the inner defects of the three-phase composite structure. Firstly, a three-layer reflection model of the terahertz wave is established, and a corresponding theoretical analysis of three-phase composite with insulation delamination defect is carried out. After then, an artificial sample with a delamination defect is prepared according to the actual structure of the three-phase composite. Besides, the THz-TDS analysis of the samples is carried out after tested by the THz-TDS system with the reflective mode. The experimental results show that the insulation delamination of the three-phase composite can be effectively identified by collecting the signals of the THz-TDS system. This paper theoretically and experimentally proves the feasibility of the new method based on the THz-TDS system for three-phase composite delamination nondestructive testing, which provides a new idea for inner defects detection within the three-phase composite and its condition assessment.
{"title":"Insulation Delamination Detection of Three-Phase Composite Structure Based on Terahertz Time-Domain Spectral","authors":"Bing-zheng Cao, Shuaibing Li, Yongqiang Kang, Jingtao Lu, Xingzu Yang, Haiying Dong","doi":"10.1109/ICEMPE51623.2021.9509103","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509103","url":null,"abstract":"The three-phase composite structure is widely used in the power industry, especially for insulation systems of power equipment. As delamination defects always take place on such equipment, i.e. defects occur inside the three-phase composite structure. Therefore, this paper proposes to used the terahertz time-domain spectroscopy (THz-TDS) to detect the inner defects of the three-phase composite structure. Firstly, a three-layer reflection model of the terahertz wave is established, and a corresponding theoretical analysis of three-phase composite with insulation delamination defect is carried out. After then, an artificial sample with a delamination defect is prepared according to the actual structure of the three-phase composite. Besides, the THz-TDS analysis of the samples is carried out after tested by the THz-TDS system with the reflective mode. The experimental results show that the insulation delamination of the three-phase composite can be effectively identified by collecting the signals of the THz-TDS system. This paper theoretically and experimentally proves the feasibility of the new method based on the THz-TDS system for three-phase composite delamination nondestructive testing, which provides a new idea for inner defects detection within the three-phase composite and its condition assessment.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"20 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80973038","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}
Lightning could lead to insulation failure if there is no protective steps were taken. Typically for this reason a lightning arrester is used. A novel insulator incorporating an arrester and an insulator for 10 kV power lines was designed to integrate the insulator with the lightning arrester as a single entities. This paper aims to study the AC flashover performance and insulation coordination of novel lightning protection composite insulator. The results shows that $U_{f}$ decreases with the increase of ESDD. Specifically, when ESDD increases from 0.01 mg/cm2 to 0.2 mg/cm2, $U_{f}$ decreases from 44.4 kV to 15.1 kV. Thus, the maximum air gap distance to ensure the normal operation of the insulation section is 19 mm, 13mm and 10mm, when ESDD is 0.07mg/cm2, 0.09mg/cm2, 0.11mg/cm2 respectively. This paper presented the insulation coordination of the insulation section, ensuring that the protection gap can work normally.
{"title":"AC Flashover Performance and Insulation Coordination of Novel Lightning Protection Composite Insulator","authors":"Jiazheng Lu, Jianping Hu, Zhen Fang, Xinhan Qiao, Zhijin Zhang, Xingliang Jiang","doi":"10.1109/ICEMPE51623.2021.9509153","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509153","url":null,"abstract":"Lightning could lead to insulation failure if there is no protective steps were taken. Typically for this reason a lightning arrester is used. A novel insulator incorporating an arrester and an insulator for 10 kV power lines was designed to integrate the insulator with the lightning arrester as a single entities. This paper aims to study the AC flashover performance and insulation coordination of novel lightning protection composite insulator. The results shows that $U_{f}$ decreases with the increase of ESDD. Specifically, when ESDD increases from 0.01 mg/cm2 to 0.2 mg/cm2, $U_{f}$ decreases from 44.4 kV to 15.1 kV. Thus, the maximum air gap distance to ensure the normal operation of the insulation section is 19 mm, 13mm and 10mm, when ESDD is 0.07mg/cm2, 0.09mg/cm2, 0.11mg/cm2 respectively. This paper presented the insulation coordination of the insulation section, ensuring that the protection gap can work normally.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"90 6 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79894830","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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