Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279737
W. Si, X. Huang, Zheng Zhu, B. Wei, L. Su, P. Yuan
According to the disadvantages and advantages of electromagnetic and acoustic partial discharges (PD) measurements shown in IEC TS 62478 Edition 1.0 2016–08, a combined in-oil PD sensor with acoustical emission (AE) and Ultra high frequency (UHF) methods for PD detection in transformer is designed and developed in this paper. It is formed by placing an AE sensor inside the end part of UHF probe, and can be mounted on the oil valve, pushed inside the transformer to measure the acoustic and electromagnetic signals from PD simultaneously. The structure design of a combined UHF/AE in-oil PD sensor considering signals coupling and oil sealing are given in detail, with AE sensor and UHF antenna working independently of each other based on two output channels to avoid the application of different bandwidth hardware filters. Tests of discharges in air show that the novel combined UHF/AE in-oil PD sensor designed and developed can couple the electromagnetic and acoustic signals generated by discharge pulse at the same time effectively.
根据IEC TS 62478 version 1.0 2016-08中电磁和声局部放电(PD)测量方法的优缺点，设计并研制了一种结合声发射和超高频(UHF)方法的油内局部放电传感器，用于变压器局部放电检测。它是在UHF探头的端部放置一个声发射传感器形成的，可以安装在油阀上，推入变压器内部，同时测量PD发出的声和电磁信号。详细介绍了考虑信号耦合和油封的UHF/AE油内PD传感器的结构设计，AE传感器和UHF天线基于两个输出通道相互独立工作，避免了不同带宽硬件滤波器的应用。空中放电试验表明，所设计研制的新型超高频/声发射组合油内PD传感器能够有效地将放电脉冲产生的电磁信号和声信号同时耦合起来。
{"title":"A novel combined in-oil PD sensor with AE and UHF methods for PD detection in transformer, part 1: structural design and development","authors":"W. Si, X. Huang, Zheng Zhu, B. Wei, L. Su, P. Yuan","doi":"10.1109/ICHVE49031.2020.9279737","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279737","url":null,"abstract":"According to the disadvantages and advantages of electromagnetic and acoustic partial discharges (PD) measurements shown in IEC TS 62478 Edition 1.0 2016–08, a combined in-oil PD sensor with acoustical emission (AE) and Ultra high frequency (UHF) methods for PD detection in transformer is designed and developed in this paper. It is formed by placing an AE sensor inside the end part of UHF probe, and can be mounted on the oil valve, pushed inside the transformer to measure the acoustic and electromagnetic signals from PD simultaneously. The structure design of a combined UHF/AE in-oil PD sensor considering signals coupling and oil sealing are given in detail, with AE sensor and UHF antenna working independently of each other based on two output channels to avoid the application of different bandwidth hardware filters. Tests of discharges in air show that the novel combined UHF/AE in-oil PD sensor designed and developed can couple the electromagnetic and acoustic signals generated by discharge pulse at the same time effectively.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"25 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74868396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279927
Longtao Ma, Yulun Chen, Dingge Yang, Bo Niu, Yanhua Han, Dan Xu, Guanjun Zhang
Partial discharge (PD) detection and recognition are of great slgnificance to the condition monitoring of gas-insulated switchgear (GIS). The study focuses on the development process of PD creeping discharge induced by metallic particles in GIS. A GIS simulation experiment platform which was set up according to the actual operating conditions of GIS was employed for this. The discharge pattern of various stages was measured by pulse current method, meanwhile the characteristic parameters which can characterize the severity of PD effectively were extracted. Intensified CCD (ICCD) was also used to record the evolution process of PD. At last, the PD creeping discharge development was divided into 3 stages, which was manifested by K-means clustering algorithm, and they are corona discharge domination, coexistence of corona discharge and surface streamer discharge and surface streamer discharge domination respectively.
{"title":"Study on the PD Creeping Discharge Development Process Induced by Metallic Particles in GIS","authors":"Longtao Ma, Yulun Chen, Dingge Yang, Bo Niu, Yanhua Han, Dan Xu, Guanjun Zhang","doi":"10.1109/ICHVE49031.2020.9279927","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279927","url":null,"abstract":"Partial discharge (PD) detection and recognition are of great slgnificance to the condition monitoring of gas-insulated switchgear (GIS). The study focuses on the development process of PD creeping discharge induced by metallic particles in GIS. A GIS simulation experiment platform which was set up according to the actual operating conditions of GIS was employed for this. The discharge pattern of various stages was measured by pulse current method, meanwhile the characteristic parameters which can characterize the severity of PD effectively were extracted. Intensified CCD (ICCD) was also used to record the evolution process of PD. At last, the PD creeping discharge development was divided into 3 stages, which was manifested by K-means clustering algorithm, and they are corona discharge domination, coexistence of corona discharge and surface streamer discharge and surface streamer discharge domination respectively.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"28 06","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72585183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279396
R. Men, Z. Lei, Jiancheng Song, K. Han, Lu Li, Chuangyang Li
Random copolymerization polypropylene (PPR), a recyclable thermoplastic material with a melting temperature of over 150°C and excellent mechanical properties, has potential to become the insulation materials used in high voltage cables. To investigate dielectric properties of PPR and its nanocomposites at different temperatures, especially the dielectric spectrum at high temperatures, film samples of PPR and its nanocomposites doped with different content of nano silica were prepared. The microscopic morphologies were observed firstly for analyzing the dispersion of nanoparticles. Then the dielectric spectrums were measured at temperatures of 30, 50, 70, 90, 110 and 130°C. After this, the effects of nanoparticle content, temperature and frequency on the relative permittivity and dielectric dissipation factors are discussed and the mechanism is analyzed. It can be concluded that relative permittivity of PPR and its nanocomposites are almost unaffected by temperature in the range of 30 - 110°C and remains relatively low values. When the temperature is below 110°C, the relative permittivity of the PPR nanocomposites increases with the increase of temperature; And when the temperature is 110°C or above, the value is related to the applied voltage frequency and the content of nanoparticles. And with the temperature rising, the dielectric dissipation factor of PPR nanocomposites have an evident increase at lower frequency, which contributes to the DC conductivity.
{"title":"Dielectric Spectrum of Random Copolymerization Polypropylene Nanocomposites Doped with Nano Silica at Different Temperatures","authors":"R. Men, Z. Lei, Jiancheng Song, K. Han, Lu Li, Chuangyang Li","doi":"10.1109/ICHVE49031.2020.9279396","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279396","url":null,"abstract":"Random copolymerization polypropylene (PPR), a recyclable thermoplastic material with a melting temperature of over 150°C and excellent mechanical properties, has potential to become the insulation materials used in high voltage cables. To investigate dielectric properties of PPR and its nanocomposites at different temperatures, especially the dielectric spectrum at high temperatures, film samples of PPR and its nanocomposites doped with different content of nano silica were prepared. The microscopic morphologies were observed firstly for analyzing the dispersion of nanoparticles. Then the dielectric spectrums were measured at temperatures of 30, 50, 70, 90, 110 and 130°C. After this, the effects of nanoparticle content, temperature and frequency on the relative permittivity and dielectric dissipation factors are discussed and the mechanism is analyzed. It can be concluded that relative permittivity of PPR and its nanocomposites are almost unaffected by temperature in the range of 30 - 110°C and remains relatively low values. When the temperature is below 110°C, the relative permittivity of the PPR nanocomposites increases with the increase of temperature; And when the temperature is 110°C or above, the value is related to the applied voltage frequency and the content of nanoparticles. And with the temperature rising, the dielectric dissipation factor of PPR nanocomposites have an evident increase at lower frequency, which contributes to the DC conductivity.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"22 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73390171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279870
W. Tie, Jing Sun, Jinyong Fang, Manyu Wang, R. Han
Ultra-wideband (UWB) high power microwave (HPM) causes irreversible damage to the industrial and civil equipments. Therefore, it is necessary to establish an UWB high power electromagnetic pulse radiation source for studying radiation damage mechanism. Note that time-domain pulse compression is an important technological approach to generate the UWB high power electromagnetic pulse, therefore which has received extensive attention at home and abroad. In this paper, firstly, the basic working principle of time-domain pulse compression is introduced briefly, the voltage waveform parameters of compressed pulse, the power gain and the energy conversion efficiency are deduced. Then, a novel time-domain impedance transformation and pulse compression circuit topology is proposed, and the power transmission efficiency of variable-impedance transmission line (VITL), the pulse compression efficiency and the total power gain of this circuit topology are numerical analyzed. Finally, the key design parameters of time-domain pulse compression circuit are given. The research work provides the theory support for the design of the UWB high power electromagnetic pulse radiation system.
{"title":"Numerical Analysis on Design of a New Type Power Time-domain Pulse Compression Circuit Topology","authors":"W. Tie, Jing Sun, Jinyong Fang, Manyu Wang, R. Han","doi":"10.1109/ICHVE49031.2020.9279870","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279870","url":null,"abstract":"Ultra-wideband (UWB) high power microwave (HPM) causes irreversible damage to the industrial and civil equipments. Therefore, it is necessary to establish an UWB high power electromagnetic pulse radiation source for studying radiation damage mechanism. Note that time-domain pulse compression is an important technological approach to generate the UWB high power electromagnetic pulse, therefore which has received extensive attention at home and abroad. In this paper, firstly, the basic working principle of time-domain pulse compression is introduced briefly, the voltage waveform parameters of compressed pulse, the power gain and the energy conversion efficiency are deduced. Then, a novel time-domain impedance transformation and pulse compression circuit topology is proposed, and the power transmission efficiency of variable-impedance transmission line (VITL), the pulse compression efficiency and the total power gain of this circuit topology are numerical analyzed. Finally, the key design parameters of time-domain pulse compression circuit are given. The research work provides the theory support for the design of the UWB high power electromagnetic pulse radiation system.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"66 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73986172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279989
Y. Miao, Zhaofeng Wan, F. Zeng, Q. Yao
$mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ gas insulating medium has received universal attention by electrical industry for its superior environmental and insulating characteristics. As to the industrial application of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$, due to the limit of saturated vapor pressure characteristic, it must be applied mixed with background gases in order to remain gaseous state in normal temperature, so its necessary to research how the ratio of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ and background gas influence the physical, chemical and insulating properties. If different ratios of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ itself can remain stable under long term over thermal failure is a significant factor of the industrial application. In this paper, we apply systematic researches on the existing gas insulating partial over thermal experimental platform, figure out the decomposition characteristics of 2%, 5% and 8% $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ with background gas He under several hours of highest temperature of $500^{circ}mathrm{C}$. Then a quantitative detection of the concentration changes of seven decomposition products is done, before analysis of their generation patterns. At last, we process the data and obtain total decomposition product and the proportion of total decomposition product, to characterize the thermal stability and degree of decomposition under different ratios. The production amount and gas production rate of each product vary differently with $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ ratio, but the proportion of total decomposition product reaches the peak when $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ is 5%, which means it has the worst thermal stability. The research results of this paper have laid a foundation for the industrial application of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ gas.
{"title":"Over Thermal Decomposition Characteristics of Environmental Insulating Medium $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ at Different Concentrations","authors":"Y. Miao, Zhaofeng Wan, F. Zeng, Q. Yao","doi":"10.1109/ICHVE49031.2020.9279989","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279989","url":null,"abstract":"$mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ gas insulating medium has received universal attention by electrical industry for its superior environmental and insulating characteristics. As to the industrial application of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$, due to the limit of saturated vapor pressure characteristic, it must be applied mixed with background gases in order to remain gaseous state in normal temperature, so its necessary to research how the ratio of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ and background gas influence the physical, chemical and insulating properties. If different ratios of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ itself can remain stable under long term over thermal failure is a significant factor of the industrial application. In this paper, we apply systematic researches on the existing gas insulating partial over thermal experimental platform, figure out the decomposition characteristics of 2%, 5% and 8% $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ with background gas He under several hours of highest temperature of $500^{circ}mathrm{C}$. Then a quantitative detection of the concentration changes of seven decomposition products is done, before analysis of their generation patterns. At last, we process the data and obtain total decomposition product and the proportion of total decomposition product, to characterize the thermal stability and degree of decomposition under different ratios. The production amount and gas production rate of each product vary differently with $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ ratio, but the proportion of total decomposition product reaches the peak when $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ is 5%, which means it has the worst thermal stability. The research results of this paper have laid a foundation for the industrial application of $mathrm{C}_{5}mathrm{F}_{10}mathrm{O}$ gas.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"10 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84231703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279550
Fang Su, Xiao-yan Wei, Zhang Fuzeng, Wei Xiaoxing, Chu Jinwei, W. Tingting, Xu Yongsheng
Operating in hot and humid regions, composite insulators are subject to high temperature and high humidity for extended time, which accelerates the aging of silicone rubber. In this paper, for the purpose of exploring the influence of temperature and humidity on the aging of composite insulators, thermal oxidation, water soaking and boiling conditions were designed for simulating a high-temperature environment, a high-humidity environment and a hot and humid environment. It is found that high temperature will promote the aging of composite insulators, mainly manifested by the formation of silicone rubber inorganics and the decomposition of ATH. A high humidity environment contributes to water infiltration, filler precipitation and crack formation. When high humidity is combined with high temperature, significant loss of small molecules happened and the invasion of water is promoted, which facilitates the precipitation of fillers to form a fluffy powder layer.
{"title":"Study on the Aging Factors and Mechanisms for HTV in Composite Insulators in Hot and Humid Environments","authors":"Fang Su, Xiao-yan Wei, Zhang Fuzeng, Wei Xiaoxing, Chu Jinwei, W. Tingting, Xu Yongsheng","doi":"10.1109/ICHVE49031.2020.9279550","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279550","url":null,"abstract":"Operating in hot and humid regions, composite insulators are subject to high temperature and high humidity for extended time, which accelerates the aging of silicone rubber. In this paper, for the purpose of exploring the influence of temperature and humidity on the aging of composite insulators, thermal oxidation, water soaking and boiling conditions were designed for simulating a high-temperature environment, a high-humidity environment and a hot and humid environment. It is found that high temperature will promote the aging of composite insulators, mainly manifested by the formation of silicone rubber inorganics and the decomposition of ATH. A high humidity environment contributes to water infiltration, filler precipitation and crack formation. When high humidity is combined with high temperature, significant loss of small molecules happened and the invasion of water is promoted, which facilitates the precipitation of fillers to form a fluffy powder layer.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"11 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84308682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ichve49031.2020.9280002
W. Zhiqiang
At present, with the development of electric vehicle technology, there are more and more high-voltage electric equipment in the whole vehicle, and the voltage level in the vehicle is also improved, so the safety of electric highvoltage is becoming more and more important. Insulation detection is one of the key high-voltage safety technologies, but most of the current detection methods in the electric vehicle insulation resistance comprehensive detection, fault location and other aspects of defects, can not meet the electric vehicle insulation detection of increasingly high requirements. For electric car high voltage safety issues, based on the insulation resistance testing carried on the thorough research as the research object, this paper proposes a low frequency injection insulation resistance online detection algorithm, and builds the equivalent model, and analysis show that the algorithm can be to conduct a comprehensive testing insulation resistance for electric vehicle, and can be for a single point of insulation fault of power battery fault point location. Experimental results show that the designed system can realize the insulation resistance detection function, and the error rate is low, the proposed algorithm is correct, and the safety performance of electric vehicles is further improved.
{"title":"Research on on-line monitoring method of insulation state of electric vehicle high voltage system","authors":"W. Zhiqiang","doi":"10.1109/ichve49031.2020.9280002","DOIUrl":"https://doi.org/10.1109/ichve49031.2020.9280002","url":null,"abstract":"At present, with the development of electric vehicle technology, there are more and more high-voltage electric equipment in the whole vehicle, and the voltage level in the vehicle is also improved, so the safety of electric highvoltage is becoming more and more important. Insulation detection is one of the key high-voltage safety technologies, but most of the current detection methods in the electric vehicle insulation resistance comprehensive detection, fault location and other aspects of defects, can not meet the electric vehicle insulation detection of increasingly high requirements. For electric car high voltage safety issues, based on the insulation resistance testing carried on the thorough research as the research object, this paper proposes a low frequency injection insulation resistance online detection algorithm, and builds the equivalent model, and analysis show that the algorithm can be to conduct a comprehensive testing insulation resistance for electric vehicle, and can be for a single point of insulation fault of power battery fault point location. Experimental results show that the designed system can realize the insulation resistance detection function, and the error rate is low, the proposed algorithm is correct, and the safety performance of electric vehicles is further improved.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"6 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84681633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279570
Zhuolin Cheng, Jiao Xiang, Chuang Zhang, Hang Fu, L. Xin, Xiaotong Zhang, Shihang Wang, Jianying Li
Epoxy resin (EP) has been used as insulating material in power electronic transformer (PET), while low thermal conductivity of EP limits the heat dissipation efficiency of PET. Role of Micro-nano hexagonal boron nitride coordination on thermal conductivity and breakdown strength of epoxy composites was explored. A thermal conductivity of 0.544 W/(m·K) was obtained for 10 wt% BN/EP micro composites, increased by 149.5% compared with pristine epoxy. In addition, the specimen with a dual doping of 10 wt% h-BN and 5 wt% nano filler exhibited both improved thermal conductivity of 0.527 W/(m·K) and breakdown strength of 118.3 kV/mm. It is found that micro-BN could effectively increase the thermal conductivity since efficient heat transform path would be built inside epoxy matrix. Meanwhile, nano-BN would bring in independent interfacial regions that capture carriers at low filler content. Based on the coordination of micro-nano particles, the thermal conductivity and breakdown strength can thus be enhanced simultaneously.
{"title":"Role of Micro-nano Hexagonal Boron Nitride Coordination on Thermal Conductivity and Breakdown Strength of Epoxy Composites","authors":"Zhuolin Cheng, Jiao Xiang, Chuang Zhang, Hang Fu, L. Xin, Xiaotong Zhang, Shihang Wang, Jianying Li","doi":"10.1109/ICHVE49031.2020.9279570","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279570","url":null,"abstract":"Epoxy resin (EP) has been used as insulating material in power electronic transformer (PET), while low thermal conductivity of EP limits the heat dissipation efficiency of PET. Role of Micro-nano hexagonal boron nitride coordination on thermal conductivity and breakdown strength of epoxy composites was explored. A thermal conductivity of 0.544 W/(m·K) was obtained for 10 wt% BN/EP micro composites, increased by 149.5% compared with pristine epoxy. In addition, the specimen with a dual doping of 10 wt% h-BN and 5 wt% nano filler exhibited both improved thermal conductivity of 0.527 W/(m·K) and breakdown strength of 118.3 kV/mm. It is found that micro-BN could effectively increase the thermal conductivity since efficient heat transform path would be built inside epoxy matrix. Meanwhile, nano-BN would bring in independent interfacial regions that capture carriers at low filler content. Based on the coordination of micro-nano particles, the thermal conductivity and breakdown strength can thus be enhanced simultaneously.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"115 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85499618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279756
Pengcheng Song, Li Zhang, L. Zou, T. Zhao, Youliang Sun
In the voltage source converter based high voltage direct current (VSC-HVDC) converter station, the transient switching process of insulated gate bipolar transistor (IGBT) in the converter valve is one of the main sources of electromagnetic interference. At present, the behavioral model is widely used in the transient switching process modeling of IGBT. Although this model has significant advantages in terms of simulation speed and universality, it has some disadvantages such as low simulation accuracy. Given the shortcomings of the existing models, this paper proposes an improved behavioral model based on the vector fitting method. Firstly, this paper builds the traditional behavioral model and compares the simulated waveforms with the actual waveforms to identify the stages with low simulation accuracy of the traditional behavioral model. Then the vector fitting method is used to fit the waveforms of low simulation accuracy, and the fitted equation is transformed into the form of equivalent circuit in time domain. After that, the equivalent circuit model is combined with the traditional behavioral model to complete the improvement for the traditional model. Finally, this paper builds the improved model in Matlab/Simulink, and the comparison and error analysis between the simulated waveforms and experimental waveforms are carried out. The results show that the simulation accuracy of the proposed model is greatly improved compared with the traditional model.
{"title":"An Improved Transient Model of High Voltage IGBT Based on Vector Fitting","authors":"Pengcheng Song, Li Zhang, L. Zou, T. Zhao, Youliang Sun","doi":"10.1109/ICHVE49031.2020.9279756","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279756","url":null,"abstract":"In the voltage source converter based high voltage direct current (VSC-HVDC) converter station, the transient switching process of insulated gate bipolar transistor (IGBT) in the converter valve is one of the main sources of electromagnetic interference. At present, the behavioral model is widely used in the transient switching process modeling of IGBT. Although this model has significant advantages in terms of simulation speed and universality, it has some disadvantages such as low simulation accuracy. Given the shortcomings of the existing models, this paper proposes an improved behavioral model based on the vector fitting method. Firstly, this paper builds the traditional behavioral model and compares the simulated waveforms with the actual waveforms to identify the stages with low simulation accuracy of the traditional behavioral model. Then the vector fitting method is used to fit the waveforms of low simulation accuracy, and the fitted equation is transformed into the form of equivalent circuit in time domain. After that, the equivalent circuit model is combined with the traditional behavioral model to complete the improvement for the traditional model. Finally, this paper builds the improved model in Matlab/Simulink, and the comparison and error analysis between the simulated waveforms and experimental waveforms are carried out. The results show that the simulation accuracy of the proposed model is greatly improved compared with the traditional model.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"24 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82034139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279833
Berihu Mebrahtom, S. Matharage, Qiang Liu, C. Krause, A. Gyore, Luke van der Zel
As accelerated ageing tests in full-size transformers are impractical, laboratory ageing experiments are often used to understand the ageing process of transformer insulation systems. Three main types of ageing experiment set-up can be identified in literature: a functional life test model, a dual-temperature test cell and a single temperature test cell. A functional life test model is a scaled-down representation of transformer operation, but it is very expensive to run. A single temperature test cell is the simplest and most widely used laboratory test set-up but it cannot reflect the different temperature profiles and gradients found inside a real transformer. The dual-temperature test cell is less complicated and less costly than the transformer model and still has the ability to simulate the different temperatures experienced by transformer insulation. In a dual temperature cell the solid and liquid insulation temperatures are independently controlled, thereby overcoming the main disadvantage of the single temperature test cell method. In this paper, the design and construction of a dual-temperature test system based on the IEC TS 62332-1 technical specification is described and test results are provided to show that the test system fulfils the desired functions with stable conductor and liquid temperatures.
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