Pub Date : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509185
Yang Su, Gang Liu, Xiaoming Zhang, Song Yan, Kai Ma, Daojun Huang, Yushun Zhao
The centralized distribution of a large number of power equipment in the switchyard of 500kV substations leads to complicated magnetic field distribution in the switchyard. High-voltage open circuit breakers under maintenance will generate induced currents, which is a safety hazard for circuit breaker maintenance workers. This article first measures the induced current of the circuit breaker, cable, grounding grid, and two grounding wires and the grounding switch in the 500kV switchyard of the substation, and then measures the power frequency magnetic field in the 500kV switchyard of the substation. simulation Research. The measurement and calculation results show that the peak-to-peak value of the induced current generated by the circuit breaker in the 500kV switching field in the 500kV switching field is 3.93∼7.33A, the magnetic induction intensity ranges between 0.44∼8.76µT, and the maximum power frequency magnetic field intensity is mainly concentrated Below the second bus, the closer to the normal working bus, the greater the magnetic induction intensity, which leads to the greater the induced current generated in the high-voltage open circuit breaker. When the high-voltage open circuit breaker is under maintenance, the ground wire is suspended at both ends of the circuit breaker to effectively reduce the induced voltage, thereby ensuring the safety of the operators.
{"title":"Calculation and Analysis of Induced Current of Open Circuit Breaker in 500kV Substation","authors":"Yang Su, Gang Liu, Xiaoming Zhang, Song Yan, Kai Ma, Daojun Huang, Yushun Zhao","doi":"10.1109/ICEMPE51623.2021.9509185","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509185","url":null,"abstract":"The centralized distribution of a large number of power equipment in the switchyard of 500kV substations leads to complicated magnetic field distribution in the switchyard. High-voltage open circuit breakers under maintenance will generate induced currents, which is a safety hazard for circuit breaker maintenance workers. This article first measures the induced current of the circuit breaker, cable, grounding grid, and two grounding wires and the grounding switch in the 500kV switchyard of the substation, and then measures the power frequency magnetic field in the 500kV switchyard of the substation. simulation Research. The measurement and calculation results show that the peak-to-peak value of the induced current generated by the circuit breaker in the 500kV switching field in the 500kV switching field is 3.93∼7.33A, the magnetic induction intensity ranges between 0.44∼8.76µT, and the maximum power frequency magnetic field intensity is mainly concentrated Below the second bus, the closer to the normal working bus, the greater the magnetic induction intensity, which leads to the greater the induced current generated in the high-voltage open circuit breaker. When the high-voltage open circuit breaker is under maintenance, the ground wire is suspended at both ends of the circuit breaker to effectively reduce the induced voltage, thereby ensuring the safety of the operators.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"54 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":"77455089","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/ICEMPE51623.2021.9509247
Zongke Hou, Yingying Zheng, M. Guo, Yao Wang, Zhuolin Cheng, Kangning Wu, Jianying Li, Shengtao Li
Zinc oxide (ZnO) varistor ceramics present excellent nonlinear current-voltage characteristics so that they are widely used as core materials in overvoltage protection. Generally, the nonlinear characteristics of traditional ZnO varistor ceramics would deteriorate under constant DC bias voltage, manifested as the continuous increase of power loss. However, it has been reported that some commercial samples experience a decrease in power loss during DC degradation, which makes them more stable in operation. The physical mechanism behind this unusual phenomenon is still unclear yet. In this paper, commercial ZnO varistor ceramics with this unique characteristic were employed for DC degradation and accelerated recovery. Current-voltage curves were measured in the ageing and recovery process. The results show that the forward barrier height declines and the nonlinearity becomes better, in contrast, the reverse nonlinearity falls off. But after enough recovery, the electrical properties of the ageing samples almost restored to the initial levels. To sum up, the opposite changes occurred between the forward and reverse characteristics in the ZnO varistors ceramics, but both are invertible.
{"title":"Study on the Decrease of Power Loss during DC Degradation of Zinc Oxide Varistor Ceramics","authors":"Zongke Hou, Yingying Zheng, M. Guo, Yao Wang, Zhuolin Cheng, Kangning Wu, Jianying Li, Shengtao Li","doi":"10.1109/ICEMPE51623.2021.9509247","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509247","url":null,"abstract":"Zinc oxide (ZnO) varistor ceramics present excellent nonlinear current-voltage characteristics so that they are widely used as core materials in overvoltage protection. Generally, the nonlinear characteristics of traditional ZnO varistor ceramics would deteriorate under constant DC bias voltage, manifested as the continuous increase of power loss. However, it has been reported that some commercial samples experience a decrease in power loss during DC degradation, which makes them more stable in operation. The physical mechanism behind this unusual phenomenon is still unclear yet. In this paper, commercial ZnO varistor ceramics with this unique characteristic were employed for DC degradation and accelerated recovery. Current-voltage curves were measured in the ageing and recovery process. The results show that the forward barrier height declines and the nonlinearity becomes better, in contrast, the reverse nonlinearity falls off. But after enough recovery, the electrical properties of the ageing samples almost restored to the initial levels. To sum up, the opposite changes occurred between the forward and reverse characteristics in the ZnO varistors ceramics, but both are invertible.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"25 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":"84766507","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/ICEMPE51623.2021.9509140
Changjie Zhou, D. Xiao, Yang Bao
In case of wildfire, particles generated in combustion are in complex law of motion under the influence of flame temperature, airflow and lots of electrons and ions. They would distort the space electric field, and lead to gap discharge. This paper develops a multi-physics coupling calculation model of fluid, temperature, electric field and particle movement by combining the rod-plate gap experiment that simulates the wildfire condition. It analyzes the motion state of ash particles in flames, studies the charged particles of different polarity separately, and explores the impact of particle properties on the electric field of gap space by combining the distribution of particles. Results have shown that there are differences in the motion state of charged particles of different polarity, and the electrode will absorb some particles with different charges, while charged particles with the same polarity as the electrode will move away from the electrode in random motion. Particles of different properties (particle size, relative dielectric constant) have different impacts on the electric field of gap space, but they all promote the discharge propagation.
{"title":"Numerical Analysis of the Motion Characteristics of Combustion Particles in Gap based on Multi-Physical Field Coupling","authors":"Changjie Zhou, D. Xiao, Yang Bao","doi":"10.1109/ICEMPE51623.2021.9509140","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509140","url":null,"abstract":"In case of wildfire, particles generated in combustion are in complex law of motion under the influence of flame temperature, airflow and lots of electrons and ions. They would distort the space electric field, and lead to gap discharge. This paper develops a multi-physics coupling calculation model of fluid, temperature, electric field and particle movement by combining the rod-plate gap experiment that simulates the wildfire condition. It analyzes the motion state of ash particles in flames, studies the charged particles of different polarity separately, and explores the impact of particle properties on the electric field of gap space by combining the distribution of particles. Results have shown that there are differences in the motion state of charged particles of different polarity, and the electrode will absorb some particles with different charges, while charged particles with the same polarity as the electrode will move away from the electrode in random motion. Particles of different properties (particle size, relative dielectric constant) have different impacts on the electric field of gap space, but they all promote the discharge propagation.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"11 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":"84202966","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/ICEMPE51623.2021.9509094
Guiyue Zhou, Y. Yin, Jiandong Wu, Lu Che
The winding insulation in transformer usually bears the combined action of DC and AC components during the operation. The positive and negative charges are injected from the electrodes respectively, while under the AC field, the injection of positive and negative charges alternately occurs on the single electrode due to the periodic change of the electric field polarity, and the direction of carrier migration changes with the applied field. Thus, the charge behavior under AC field is more complicated. In this paper, the space charge distribution in oil-impregnated paper with different aging times was measured under different frequency sinusoidal electric fields. According to the phase characteristics of charge distribution, the effect of thermal aging on the charge behavior under AC field was analyzed from the perspective of charge source. It shows that there is charge hysteresis in the insulation, that is, the residual charges injected in the previous cycle form a heterocharge accumulation after the voltage is reversed, resulting in serious field distortion. According to the preliminary analysis of the results from early aging period, the more severe the aging, the less obvious the charge hysteresis is, which may be related to the decrease of the trap depth caused by thermal degradation. It is speculated that the charge hysteresis under AC field is an important cause of accelerating the electrical aging of the insulation.
{"title":"The Influence of Thermal Aging on Space Charge Distribution in Oil-impregnated Paper under AC Field","authors":"Guiyue Zhou, Y. Yin, Jiandong Wu, Lu Che","doi":"10.1109/ICEMPE51623.2021.9509094","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509094","url":null,"abstract":"The winding insulation in transformer usually bears the combined action of DC and AC components during the operation. The positive and negative charges are injected from the electrodes respectively, while under the AC field, the injection of positive and negative charges alternately occurs on the single electrode due to the periodic change of the electric field polarity, and the direction of carrier migration changes with the applied field. Thus, the charge behavior under AC field is more complicated. In this paper, the space charge distribution in oil-impregnated paper with different aging times was measured under different frequency sinusoidal electric fields. According to the phase characteristics of charge distribution, the effect of thermal aging on the charge behavior under AC field was analyzed from the perspective of charge source. It shows that there is charge hysteresis in the insulation, that is, the residual charges injected in the previous cycle form a heterocharge accumulation after the voltage is reversed, resulting in serious field distortion. According to the preliminary analysis of the results from early aging period, the more severe the aging, the less obvious the charge hysteresis is, which may be related to the decrease of the trap depth caused by thermal degradation. It is speculated that the charge hysteresis under AC field is an important cause of accelerating the electrical aging of the insulation.","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":"82356023","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/ICEMPE51623.2021.9509150
Deng Zhixiang, Pan Jianbing, Yan Nianping, Hao Yu, Qi Qinya, Chen Gege, Chen Zhen, Huang Yangqi
Elbow cable terminal is widely used in ring main unit and cable branch box and is prone to causing fault. In this paper, experiment and disassembling analysis were made on a fault elbow cable terminal, which occurred faults repeatedly. It was investigated that the key processes of the fault elbow cable terminal were not well-controlled so that led to partial discharge. Finite element method (FEM) was used to calculate the electric field distribution of the elbow cable terminal and the result confirms that the key process is the main reason for the repeated faults. Finally, corresponding suggestions were proposed combined with practical operation and maintenance experience.
{"title":"Fault Analysis and Electric Field Simulation of Elbow Cable Terminal in Distribution Network","authors":"Deng Zhixiang, Pan Jianbing, Yan Nianping, Hao Yu, Qi Qinya, Chen Gege, Chen Zhen, Huang Yangqi","doi":"10.1109/ICEMPE51623.2021.9509150","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509150","url":null,"abstract":"Elbow cable terminal is widely used in ring main unit and cable branch box and is prone to causing fault. In this paper, experiment and disassembling analysis were made on a fault elbow cable terminal, which occurred faults repeatedly. It was investigated that the key processes of the fault elbow cable terminal were not well-controlled so that led to partial discharge. Finite element method (FEM) was used to calculate the electric field distribution of the elbow cable terminal and the result confirms that the key process is the main reason for the repeated faults. Finally, corresponding suggestions were proposed combined with practical operation and maintenance experience.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"15 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":"84397352","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/ICEMPE51623.2021.9509056
Chen Shen, Jingang Wang, Junsheng Chen, Bin Zhang
Under realistic working conditions, the fault data of the gearbox of the wind turbines are difficult to balance with the healthy data. The imbalance of the data will affect the training results of the fault diagnosis model. To deal with such an imbalance, a fault diagnosis method with data augmentation is proposed for gearbox of the wind turbines. The method takes the spectrograms of the vibration signals as the input. Then we develop a framework of generative adversarial networks as the data augmentation model. Among the framework, the weight matrices of networks are all improved through spectrally normalization. Then the data augmentation model can be training more stably to generate samples with a high quality and diversity. Finally, taking the enhanced spectrograms as the training set, the fault diagnosis model is obtained based on the convolutional neural networks. The proposed method is verified to diagnose four working states. The results denote that the proposed method is effective in imbalanced data set.
{"title":"Gearbox Fault Diagnosis for Wind Turbines based on Data Augmentation using Improved Generative Adversarial Networks","authors":"Chen Shen, Jingang Wang, Junsheng Chen, Bin Zhang","doi":"10.1109/ICEMPE51623.2021.9509056","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509056","url":null,"abstract":"Under realistic working conditions, the fault data of the gearbox of the wind turbines are difficult to balance with the healthy data. The imbalance of the data will affect the training results of the fault diagnosis model. To deal with such an imbalance, a fault diagnosis method with data augmentation is proposed for gearbox of the wind turbines. The method takes the spectrograms of the vibration signals as the input. Then we develop a framework of generative adversarial networks as the data augmentation model. Among the framework, the weight matrices of networks are all improved through spectrally normalization. Then the data augmentation model can be training more stably to generate samples with a high quality and diversity. Finally, taking the enhanced spectrograms as the training set, the fault diagnosis model is obtained based on the convolutional neural networks. The proposed method is verified to diagnose four working states. The results denote that the proposed method is effective in imbalanced data set.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"10 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":"84609796","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/ICEMPE51623.2021.9509100
Chao Bian, F. Dai, Jun Cheng, Qiang Gan, Zhengdong Zhang, Guanglu Cui, Tingyue Tan, Dongfeng Li, Jiangang Xie
The accurate detection of SO2F2 and SOF2 of SF6 decomposition components plays a very important role in the state assessment and fault diagnosis of SF6 electrical equipment. The gas detection based on spectroscopy has the characteristics of high sensitivity, good reliability and strong anti-cross interference ability. It is a suitable detection scheme for applications in the power industry. In this paper, theoretical and experimental researches on the infrared characteristics of SO2F2 and SOF2 are carried out. The detection bands that can be used for the detection of the two decomposition components are analyzed. It provides technical reference and support for the future development of SO2F2 and SOF2 detection devices based on spectroscopic technology.
{"title":"Analysis of Infrared Characteristics of SO2F2 and SOF2 of SF6 Decomposition Components","authors":"Chao Bian, F. Dai, Jun Cheng, Qiang Gan, Zhengdong Zhang, Guanglu Cui, Tingyue Tan, Dongfeng Li, Jiangang Xie","doi":"10.1109/ICEMPE51623.2021.9509100","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509100","url":null,"abstract":"The accurate detection of SO<inf>2</inf>F<inf>2</inf> and SOF<inf>2</inf> of SF<inf>6</inf> decomposition components plays a very important role in the state assessment and fault diagnosis of SF<inf>6</inf> electrical equipment. The gas detection based on spectroscopy has the characteristics of high sensitivity, good reliability and strong anti-cross interference ability. It is a suitable detection scheme for applications in the power industry. In this paper, theoretical and experimental researches on the infrared characteristics of SO<inf>2</inf>F<inf>2</inf> and SOF<inf>2</inf> are carried out. The detection bands that can be used for the detection of the two decomposition components are analyzed. It provides technical reference and support for the future development of SO<inf>2</inf>F<inf>2</inf> and SOF<inf>2</inf> detection devices based on spectroscopic technology.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"1 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":"83388019","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}
Evaluation of epoxy cure is an important work because the final mechanical and electrical characteristics will depend upon how the curing process was done. Dielectric analysis (DEA) is one method to monitor the curing of the epoxy. Some studies on this method can already be found in literature. However, these studies do not provide a detailed analysis of the dielectric properties of the epoxy entire curing process. As a new field evaluation method for insulation condition, the frequency domain dielectric spectroscopy (FDS) has been paid more and more attention. The purpose of this paper is to analyze the dielectric properties of epoxy curing process by frequency domain dielectric spectroscopy. An experimental platform was set up to measure the epoxy curing by using dielectric response analyzer. Epoxy samples with different curing degree were prepared by changing curing time (curing degree measured by DSC). The experimental results show that at the same frequency, as the degree of curing increases, the dielectric loss factor and dielectric constant first increase, then decrease, and finally remain unchanged. The frequency domain dielectric spectroscopy has the potential to detect the degree of epoxy.
{"title":"Study on Epoxy Resin Curing Process Based on Frequency Dielectric Spectroscopy","authors":"Yinjun Shi, Yushun Zhao, Wei Yang, Xin Chen, Yun Chen","doi":"10.1109/ICEMPE51623.2021.9509230","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509230","url":null,"abstract":"Evaluation of epoxy cure is an important work because the final mechanical and electrical characteristics will depend upon how the curing process was done. Dielectric analysis (DEA) is one method to monitor the curing of the epoxy. Some studies on this method can already be found in literature. However, these studies do not provide a detailed analysis of the dielectric properties of the epoxy entire curing process. As a new field evaluation method for insulation condition, the frequency domain dielectric spectroscopy (FDS) has been paid more and more attention. The purpose of this paper is to analyze the dielectric properties of epoxy curing process by frequency domain dielectric spectroscopy. An experimental platform was set up to measure the epoxy curing by using dielectric response analyzer. Epoxy samples with different curing degree were prepared by changing curing time (curing degree measured by DSC). The experimental results show that at the same frequency, as the degree of curing increases, the dielectric loss factor and dielectric constant first increase, then decrease, and finally remain unchanged. The frequency domain dielectric spectroscopy has the potential to detect the degree of epoxy.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"47 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":"89137416","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/ICEMPE51623.2021.9509005
Rui Guo, Jian Wang, Ren Liu, A. Ping, Ruofan Xiao, Jingrui Wang
Transformer is the core equipment of power system and the key to safe and reliable operation. It is very important to diagnose transformer discharge fault timely and effectively. Due to its remarkable advantages, DGA (Dissolved gas analysis) plays a decisive role in fault diagnosis of transformer. However, the severity of discharge fault can't be assessed effectively by the traditional DGA method. Therefore, an improved method named ETDCG (energy-weighted total dissolved combustible gases) is proposed based on the thermodynamics theory in this paper. Firstly, the energy-weighted factors were introduced to characterize the energy difference of typical gases and the ETDCG can be calculated based on this enthalpy changes. Then, an experimental platform for transformer discharges was built. Finally, the experiments of different discharge models and different discharge stages were carried out and the correlation between the discharge energy and ETDCG is verified.
{"title":"An Improved Method to Evaluate the Severity of Discharges with DGA Based on Thermodynamics","authors":"Rui Guo, Jian Wang, Ren Liu, A. Ping, Ruofan Xiao, Jingrui Wang","doi":"10.1109/ICEMPE51623.2021.9509005","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509005","url":null,"abstract":"Transformer is the core equipment of power system and the key to safe and reliable operation. It is very important to diagnose transformer discharge fault timely and effectively. Due to its remarkable advantages, DGA (Dissolved gas analysis) plays a decisive role in fault diagnosis of transformer. However, the severity of discharge fault can't be assessed effectively by the traditional DGA method. Therefore, an improved method named ETDCG (energy-weighted total dissolved combustible gases) is proposed based on the thermodynamics theory in this paper. Firstly, the energy-weighted factors were introduced to characterize the energy difference of typical gases and the ETDCG can be calculated based on this enthalpy changes. Then, an experimental platform for transformer discharges was built. Finally, the experiments of different discharge models and different discharge stages were carried out and the correlation between the discharge energy and ETDCG is verified.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"15 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":"80469640","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}
This paper does research on a new bushing structure as a solution to the shortcomings of the traditional transformer bushing structures. Oil-paper bushing has risk of oil leakage, explosion and combustion. Epoxy resin impregnated paper (RIP) composite bushing has the disadvantages of high cost, complex structure, complex process and difficult heat dissipation. Pure SF6 insulated bushings don't have the above problems and have the advantage of simple structure, low cost, easy mass production and maintenance in the later time.
{"title":"Structure Design of UHVDC Pure SF6 Insulated Bushing","authors":"Gengsheng Xie, Yunfei Shi, Shi-lun Shi, Qingyu Wang, Peng Liu, Zongren Peng","doi":"10.1109/ICEMPE51623.2021.9509168","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509168","url":null,"abstract":"This paper does research on a new bushing structure as a solution to the shortcomings of the traditional transformer bushing structures. Oil-paper bushing has risk of oil leakage, explosion and combustion. Epoxy resin impregnated paper (RIP) composite bushing has the disadvantages of high cost, complex structure, complex process and difficult heat dissipation. Pure SF6 insulated bushings don't have the above problems and have the advantage of simple structure, low cost, easy mass production and maintenance in the later time.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"8 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":"77678842","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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