Hot water is a kind of deicing medium with wide sources, and the impact force of its ejection is easy to control to avoid damaging the surface of glass insulator. In order to reveal the influencing factors of hot water deicing and their effect on the deicing time of glass insulator, an experiment was conducted where LXY-120 glass insulator was selected to measure the hot water deicing time under different circumstances. The results show that initial water temperature has significant effect on deicing time. At certain range, deicing time can be greatly reduced as initial water temperature increases, and it also affects deicing time increasement caused by heavier ice weight. Ejection distance and outlet pressure both have near linear relation with deicing time. It concluded that when conducting hot water deicing, on the premise of ensuring safety distance, shortening deicing distance, optimizing outlet pressure and initial water temperature can improve the ice melting efficiency.
{"title":"Characteristics of Glass Insulator Hot Water Deicing","authors":"Xiaohong Ma, Bingzhe He, Zhijin Zhang, Qi Yang, Lusong Zhang, Huan Huang","doi":"10.1109/ICEMPE51623.2021.9509086","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509086","url":null,"abstract":"Hot water is a kind of deicing medium with wide sources, and the impact force of its ejection is easy to control to avoid damaging the surface of glass insulator. In order to reveal the influencing factors of hot water deicing and their effect on the deicing time of glass insulator, an experiment was conducted where LXY-120 glass insulator was selected to measure the hot water deicing time under different circumstances. The results show that initial water temperature has significant effect on deicing time. At certain range, deicing time can be greatly reduced as initial water temperature increases, and it also affects deicing time increasement caused by heavier ice weight. Ejection distance and outlet pressure both have near linear relation with deicing time. It concluded that when conducting hot water deicing, on the premise of ensuring safety distance, shortening deicing distance, optimizing outlet pressure and initial water temperature can improve the ice melting efficiency.","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":"78873808","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/ICEMPE51623.2021.9509167
Zhenqiang Li, Min Dai, Chuanquan Liu, Ying Lou
With the increasing scale of distribution network and the large number of cable applications, the capacitive current of the system increases continuously. The conventional compensation method of arc suppression coil is limited by the capacity of the device or the space of the substation, so many substations cannot meet the compensation requirements. Distribution network arc suppression coil parallel resistance grounding has the advantages of both arc suppression coil grounding mode and resistance grounding mode. However, the arc suppression coil parallel resistance grounding is not pieced together simply by the two grounding modes, and there are some technology problems needed to study deeply. These are studied for arc suppression coil parallel resistance grounding mode in the paper, including resistance value, put into time and run time of the resistance and so on. Based on protection tripping and isolating fault quickly after single phase grounding fault, and considering to sensitivity of protection and personal safety (touch voltage and step voltage), these control strategies are put forward, which include resistance value of parallel resistance, using adjustable resistance technology proposal and its adjustable range, put into time and run time of the resistance, and the fault line selection characteristic quantity. It is suggested that the distributed compensation device should be installed on the bus or the first end of the line. If it is installed at the end of the line, in order not to affect the fault line selection, its capacity should be selected according to the undercompensated capacitance current of the line.
{"title":"Distribution Network Arc Suppression Coil Distributed Compensation and Its Influence on Fault Line Selection","authors":"Zhenqiang Li, Min Dai, Chuanquan Liu, Ying Lou","doi":"10.1109/ICEMPE51623.2021.9509167","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509167","url":null,"abstract":"With the increasing scale of distribution network and the large number of cable applications, the capacitive current of the system increases continuously. The conventional compensation method of arc suppression coil is limited by the capacity of the device or the space of the substation, so many substations cannot meet the compensation requirements. Distribution network arc suppression coil parallel resistance grounding has the advantages of both arc suppression coil grounding mode and resistance grounding mode. However, the arc suppression coil parallel resistance grounding is not pieced together simply by the two grounding modes, and there are some technology problems needed to study deeply. These are studied for arc suppression coil parallel resistance grounding mode in the paper, including resistance value, put into time and run time of the resistance and so on. Based on protection tripping and isolating fault quickly after single phase grounding fault, and considering to sensitivity of protection and personal safety (touch voltage and step voltage), these control strategies are put forward, which include resistance value of parallel resistance, using adjustable resistance technology proposal and its adjustable range, put into time and run time of the resistance, and the fault line selection characteristic quantity. It is suggested that the distributed compensation device should be installed on the bus or the first end of the line. If it is installed at the end of the line, in order not to affect the fault line selection, its capacity should be selected according to the undercompensated capacitance current of the line.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"434 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":"77034627","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/ICEMPE51623.2021.9509192
Yucheng Zhang, Z. Hao, Hai-Yue Yang, Boyu Li, Shaoyong Yao, R. Yin
As a transformer main protection, light gas protection responds to transformer failure solely based on the gas volume within its collection chamber. Such single protection criterion failed to reflect the actual transformer working condition accurately, which have led to protection malfunction or refusal-operation and caused several transformer explosions so far. In order to analyze the mechanism of gas movement and convergence within oil-immersed transformer, an experimental tank with physical structure resembling that of a power transformer is set up, corresponding two-phase flow model is established in ANSYS, simulations of different developing stages throughout the oil-paper insulation breakdown process is conducted. Experiments confirm with simulation results, which state that as fault develops, gas transferred from where the fault occurs, to the upper surface of different structures within the tank; gas generation rate increases throughout time, during which gas exhibits different moving patterns and undergo morphological changes. The purpose of this study is to clarify the gas behavior within oil-immersed transformer based on the moving and converging pattern of gas generated by transformer internal fault.
{"title":"Mechanism of Gas Movement and Convergence in Oil-immersed Transformer","authors":"Yucheng Zhang, Z. Hao, Hai-Yue Yang, Boyu Li, Shaoyong Yao, R. Yin","doi":"10.1109/ICEMPE51623.2021.9509192","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509192","url":null,"abstract":"As a transformer main protection, light gas protection responds to transformer failure solely based on the gas volume within its collection chamber. Such single protection criterion failed to reflect the actual transformer working condition accurately, which have led to protection malfunction or refusal-operation and caused several transformer explosions so far. In order to analyze the mechanism of gas movement and convergence within oil-immersed transformer, an experimental tank with physical structure resembling that of a power transformer is set up, corresponding two-phase flow model is established in ANSYS, simulations of different developing stages throughout the oil-paper insulation breakdown process is conducted. Experiments confirm with simulation results, which state that as fault develops, gas transferred from where the fault occurs, to the upper surface of different structures within the tank; gas generation rate increases throughout time, during which gas exhibits different moving patterns and undergo morphological changes. The purpose of this study is to clarify the gas behavior within oil-immersed transformer based on the moving and converging pattern of gas generated by transformer internal fault.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"41 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":"73741762","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/ICEMPE51623.2021.9509157
Peng Li, Mingxin Dong, Gang Li, Shuqi Zhang, Ke Wang, Jinzhong Li
Power transformers are the key equipment in the power grid. Direct current (DC) bias of transformer, which are often derived from solar storms, high voltage DC (HVDC) transmission and subway lines, poses a serious threat to the stable operation of the power system. To study the mechanism of the loss increase under DC bias, a magnetic-circuit coupling model was designed based on duality principle and applied to calculation of the excitation current of 110kV three-phase three-leg under different DC current injection. Subsequently, a three-dimensional (3D) simulation model of the 110kV transformer was built in which the losses of different parts under various DC currents were calculated. It is observed that the average value of the three-phase excitation current peaks increased approximately linearly with the increase of DC current. Different increasing trends appear in the loss of different components consisting of clamps, pull plates and oil tanks, which means that different temperature rises can appear in the above components probably causing local overheating. Based on the obtained results, it is necessary to distinguish the losses of different parts and further evaluate the limit of the transformer tolerance to DC bias current.
{"title":"Calculation of Excitation Current and Loss of 110kV Three-phase Transformer under DC Bias","authors":"Peng Li, Mingxin Dong, Gang Li, Shuqi Zhang, Ke Wang, Jinzhong Li","doi":"10.1109/ICEMPE51623.2021.9509157","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509157","url":null,"abstract":"Power transformers are the key equipment in the power grid. Direct current (DC) bias of transformer, which are often derived from solar storms, high voltage DC (HVDC) transmission and subway lines, poses a serious threat to the stable operation of the power system. To study the mechanism of the loss increase under DC bias, a magnetic-circuit coupling model was designed based on duality principle and applied to calculation of the excitation current of 110kV three-phase three-leg under different DC current injection. Subsequently, a three-dimensional (3D) simulation model of the 110kV transformer was built in which the losses of different parts under various DC currents were calculated. It is observed that the average value of the three-phase excitation current peaks increased approximately linearly with the increase of DC current. Different increasing trends appear in the loss of different components consisting of clamps, pull plates and oil tanks, which means that different temperature rises can appear in the above components probably causing local overheating. Based on the obtained results, it is necessary to distinguish the losses of different parts and further evaluate the limit of the transformer tolerance to DC bias current.","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":"73974525","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/ICEMPE51623.2021.9509193
J. Dong, B. Du, J. Li, H. C. Liang, H. Yao, Y. Chen
A multi-physics simulation model of the tri-post insulator in ± 800kV GIL laid horizontally is established. Based on the model, the temperature and gas flow distribution inside the GIL are obtained. The surface charge and electric field on the tri-post insulator surface are calculated considering the gas convection. Results show that the maximum temperature gradient reaches 29 K and the gas dielectric strength decreases by 11%. While the greater temperature gradient along the lower post leads to more surface charge injection through insulator buck conduction, which results in more serious electric field. The flashover is more likely to be triggered around the lower post of the tri-post insulator. It is hoped that this study can contribute a useful guide for the design and manufacture of DC-GIL.
{"title":"Surface Charge and Electric Field Distribution along Tri-post Insulators in ±800 kV GIL","authors":"J. Dong, B. Du, J. Li, H. C. Liang, H. Yao, Y. Chen","doi":"10.1109/ICEMPE51623.2021.9509193","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509193","url":null,"abstract":"A multi-physics simulation model of the tri-post insulator in ± 800kV GIL laid horizontally is established. Based on the model, the temperature and gas flow distribution inside the GIL are obtained. The surface charge and electric field on the tri-post insulator surface are calculated considering the gas convection. Results show that the maximum temperature gradient reaches 29 K and the gas dielectric strength decreases by 11%. While the greater temperature gradient along the lower post leads to more surface charge injection through insulator buck conduction, which results in more serious electric field. The flashover is more likely to be triggered around the lower post of the tri-post insulator. It is hoped that this study can contribute a useful guide for the design and manufacture of DC-GIL.","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":"75471166","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/ICEMPE51623.2021.9509203
G. Zhang, Xueqin Zhang, Bo Wang, Qing Du, Yujun Guo, Guangning Wu
The roof insulator of high-speed trains is the key equipment for high-voltage isolation and mechanical support of pantographs, and its good insulation service performance is the basic condition to ensure the safe operation of trains. The roof insulation system is the weak link of train insulation performance, therefore, it is necessary to conduct relevant research on the arcing characteristics of roof insulators along the surface discharge under high speed airflow, and to investigate the discharge characteristics of insulators along the surface of high speed trains, which is an important problem that needs to be solved in the process of high speed railroad safety operation. In this paper, surface discharge tests were conducted on insulators using wind tunnel system to obtain the motion characteristics of insulator surface discharge photons at different airflow velocities and the surface discharge arcs of insulators at different airflow velocities. It is found that the surface discharge arc position of the insulator moves significantly to the side and back with the increase of airflow speed; the UV photon and corona discharge area of the insulator move backward with the increase of airflow speed, revealing the surface arc motion characteristics of the insulator under high speed airflow. Therefore, the research of this paper provides important theoretical support for the insulation design and insulation fit of high-speed trains, which ensures the safe and stable operation of high-speed trains.
{"title":"Study on the Arc Characteristics of Insulator Creeping Discharge under High Velocity Air","authors":"G. Zhang, Xueqin Zhang, Bo Wang, Qing Du, Yujun Guo, Guangning Wu","doi":"10.1109/ICEMPE51623.2021.9509203","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509203","url":null,"abstract":"The roof insulator of high-speed trains is the key equipment for high-voltage isolation and mechanical support of pantographs, and its good insulation service performance is the basic condition to ensure the safe operation of trains. The roof insulation system is the weak link of train insulation performance, therefore, it is necessary to conduct relevant research on the arcing characteristics of roof insulators along the surface discharge under high speed airflow, and to investigate the discharge characteristics of insulators along the surface of high speed trains, which is an important problem that needs to be solved in the process of high speed railroad safety operation. In this paper, surface discharge tests were conducted on insulators using wind tunnel system to obtain the motion characteristics of insulator surface discharge photons at different airflow velocities and the surface discharge arcs of insulators at different airflow velocities. It is found that the surface discharge arc position of the insulator moves significantly to the side and back with the increase of airflow speed; the UV photon and corona discharge area of the insulator move backward with the increase of airflow speed, revealing the surface arc motion characteristics of the insulator under high speed airflow. Therefore, the research of this paper provides important theoretical support for the insulation design and insulation fit of high-speed trains, which ensures the safe and stable operation of high-speed trains.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"24 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":"72786166","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/ICEMPE51623.2021.9509209
Lingying Chen, Guangke Xu, Panfeng Shang
At present, the partial discharge(PD) detection of high voltage power capacitor usually employs a resonant circuit which requires a very bulky reactor, and a PD detector with ultrasonic sensors. One of the problems with this approach is difficult experimental setup. Another is the limitation of PD signal analyze and get further valuable information, due to the properties of ultrasonic signal itself. This paper reports on a new user-friendly and effective way to carry out PD test of HV power capacitor. This system contains a supply module, a specially made sampling impedance and a PD pulse collector. The supply module, consists of high voltage DC power generator, protection resistance, damping resistance, semiconductor switch, which is integrated designed, characterized by small size, light weight, and low power consumption. The specially made sampling impedance which is employed to obtain PD signals could be applied to the detection of capacitor samples with different capacity, and the impedance can be directly connected to the end of the capacitor without the influence of large current signal. And the PD pulse collector is different from PD detectors under stable voltage, which needs to grasp the PD signal accurately in several cycles of the test loop oscillation, and the signal acquisition is required to be continuous. Compared with the previous approach, the oscillating wave circuit with specially made impedance reported in this paper, showed much more portability for large power capacitors PD detection, and the results provided chances for time and frequency domain spectrum analysis, which could be helpful to identify the PD type of HV power capacitors.
{"title":"Research on high voltage capacitor partial discharge detection with portable oscillating wave circuit","authors":"Lingying Chen, Guangke Xu, Panfeng Shang","doi":"10.1109/ICEMPE51623.2021.9509209","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509209","url":null,"abstract":"At present, the partial discharge(PD) detection of high voltage power capacitor usually employs a resonant circuit which requires a very bulky reactor, and a PD detector with ultrasonic sensors. One of the problems with this approach is difficult experimental setup. Another is the limitation of PD signal analyze and get further valuable information, due to the properties of ultrasonic signal itself. This paper reports on a new user-friendly and effective way to carry out PD test of HV power capacitor. This system contains a supply module, a specially made sampling impedance and a PD pulse collector. The supply module, consists of high voltage DC power generator, protection resistance, damping resistance, semiconductor switch, which is integrated designed, characterized by small size, light weight, and low power consumption. The specially made sampling impedance which is employed to obtain PD signals could be applied to the detection of capacitor samples with different capacity, and the impedance can be directly connected to the end of the capacitor without the influence of large current signal. And the PD pulse collector is different from PD detectors under stable voltage, which needs to grasp the PD signal accurately in several cycles of the test loop oscillation, and the signal acquisition is required to be continuous. Compared with the previous approach, the oscillating wave circuit with specially made impedance reported in this paper, showed much more portability for large power capacitors PD detection, and the results provided chances for time and frequency domain spectrum analysis, which could be helpful to identify the PD type of HV power capacitors.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"5 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":"73105199","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/ICEMPE51623.2021.9509149
B. Du, J. Xing, M. Xiao, Z. Ran, Haoliang Liu, J. Dong
In the paper, the polypropylene (PP) films doping with m-amino benzoic acid (MAA) were prepared for increasing the dielectric strength of power capacitors. In order to investigate the effect of MAA on electrical properties, the DC breakdown strength and conductivity under different temperatures were tested and analyzed. The results show that by addition of 0.01 wt% MAA in PP films, the breakdown strength increased 18.6% than that of the pure PP film at 25 °C. DC conductivity also possessed a superior at different temperatures, which means the lower conductance loss and less heat accumulation. Besides, the isothermal discharge current (IDC) testing and quantum chemistry method were used to analyze the mechanisms and provide an effective criterion to assess the efficiency of aromatic compounds. The aromatic compounds may be a feasible way to optimize the insulation property of PP films and show great potential in the power capacitors.
{"title":"Improved Dielectric Properties of Polypropylene Films Based on Aromatic Compounds","authors":"B. Du, J. Xing, M. Xiao, Z. Ran, Haoliang Liu, J. Dong","doi":"10.1109/ICEMPE51623.2021.9509149","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509149","url":null,"abstract":"In the paper, the polypropylene (PP) films doping with m-amino benzoic acid (MAA) were prepared for increasing the dielectric strength of power capacitors. In order to investigate the effect of MAA on electrical properties, the DC breakdown strength and conductivity under different temperatures were tested and analyzed. The results show that by addition of 0.01 wt% MAA in PP films, the breakdown strength increased 18.6% than that of the pure PP film at 25 °C. DC conductivity also possessed a superior at different temperatures, which means the lower conductance loss and less heat accumulation. Besides, the isothermal discharge current (IDC) testing and quantum chemistry method were used to analyze the mechanisms and provide an effective criterion to assess the efficiency of aromatic compounds. The aromatic compounds may be a feasible way to optimize the insulation property of PP films and show great potential in the power capacitors.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"88 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":"79978574","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}
Surface charge accumulation on the epoxy spacer installed in gas insulated transmission line (GIL) and gas insulated switchgear (GIS) has been recognized as a crucial factor for electric field distortion that results in reduction of surface flashover voltage. This paper reports on the surface charge accumulation on a real size epoxy spacer in various gas atmospheres. A coaxial electrode system was designed to investigate the surface charge density on the spacer under DC voltage of −10 and −30 kV. The spacer and electrode were placed in a metal enclosed test chamber which was filled with 0.1 MPa air, 0.4 MPa SF6/N2 mixture or in vacuum so as to estimate the influence of gas atmosphere on the charge accumulation behavior. The results indicated that positive charges were accumulated on the nonplanar region in air, whereas negative charges were mainly accumulated on the nonplanar region in SF6/N2 mixture and vacuum. It is considered that the charge accumulation behavior is determined by the competition result among the bulk, the gas and the surface conductions.
{"title":"Surface Charge Accumulation on a Real Size Epoxy Spacer in Various Gas Atmospheres under DC Voltage","authors":"Wenqu Wang, Zhonglei Li, Yu Gao, Huicun Zhao, Huan Wang, X. Yuan","doi":"10.1109/ICEMPE51623.2021.9509198","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509198","url":null,"abstract":"Surface charge accumulation on the epoxy spacer installed in gas insulated transmission line (GIL) and gas insulated switchgear (GIS) has been recognized as a crucial factor for electric field distortion that results in reduction of surface flashover voltage. This paper reports on the surface charge accumulation on a real size epoxy spacer in various gas atmospheres. A coaxial electrode system was designed to investigate the surface charge density on the spacer under DC voltage of −10 and −30 kV. The spacer and electrode were placed in a metal enclosed test chamber which was filled with 0.1 MPa air, 0.4 MPa SF6/N2 mixture or in vacuum so as to estimate the influence of gas atmosphere on the charge accumulation behavior. The results indicated that positive charges were accumulated on the nonplanar region in air, whereas negative charges were mainly accumulated on the nonplanar region in SF6/N2 mixture and vacuum. It is considered that the charge accumulation behavior is determined by the competition result among the bulk, the gas and the surface conductions.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"90 2 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":"83452563","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}
For high-voltage power equipment, insulation is an important issue. The use of non-linear material can improve the electric field distribution in the device to increase the insulation utilization factor of the insulation structure. This paper takes the cable terminal as the research object, studies the influence of the thickness and length of the nonlinear material on the electric field distribution, and finds the best solution for the cable terminal. Use COMSOL to build a simulation model of DC 500kV cable terminal. Through the controlled variable method, the length and thickness of the nonlinear material are changed in the range of 300mm to 500mm and 4mm to 8mm respectively, and the corresponding electric field distribution is obtained. The results show that the end of the nonlinear material is the weak point of the high-voltage cable terminal. Within the set range, the electric field strength there decreases with the increase of the length, and also shows a decreasing trend with the increase of the thickness. The increase will increase the field strength of the surface where the external insulation is in contact with the air, so for the DC 500kV cable terminal, the best solution is when the nonlinear length is 500mm and the thickness is 4mm.
{"title":"Influence of the length and thickness of nonlinear material on electric field distribution in cable terminal","authors":"Qinghao Yang, Jun Hu, Zhikang Yuan, Jinzhong Li, Yu Yin, Hao Tang","doi":"10.1109/ICEMPE51623.2021.9509081","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509081","url":null,"abstract":"For high-voltage power equipment, insulation is an important issue. The use of non-linear material can improve the electric field distribution in the device to increase the insulation utilization factor of the insulation structure. This paper takes the cable terminal as the research object, studies the influence of the thickness and length of the nonlinear material on the electric field distribution, and finds the best solution for the cable terminal. Use COMSOL to build a simulation model of DC 500kV cable terminal. Through the controlled variable method, the length and thickness of the nonlinear material are changed in the range of 300mm to 500mm and 4mm to 8mm respectively, and the corresponding electric field distribution is obtained. The results show that the end of the nonlinear material is the weak point of the high-voltage cable terminal. Within the set range, the electric field strength there decreases with the increase of the length, and also shows a decreasing trend with the increase of the thickness. The increase will increase the field strength of the surface where the external insulation is in contact with the air, so for the DC 500kV cable terminal, the best solution is when the nonlinear length is 500mm and the thickness is 4mm.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"46 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83174782","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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