To clearly understand TCC (transient circulating current), which is one of the most important EMI (electromagnetic interference) source of GIS (gas insulated substation), a research about TCC is carried out. The generation mechanism of TCC is analyzed, and a current transformer coupling method to calculate TCC accurately is presented. Then, this paper focus on setting up the model of SF6 gas discharge, which is the key problem of calculating TCC. According to the impedance variation characteristic of SF6 gas discharge, an exponential reignition model is set up and the typical transient parameters such as amplitude, rise steepness, duration, decay time and frequency are calculated. The results show that: 1) The positive and negative maximum value of TCC with UHV(ultra-high voltage) voltage level is about 129.90 $A$ and −108.37 $A$ respectively, and the positive value of TCC is always larger than that of the negative; 2) the rise steepness of TCC waveform can reach $321.39 A/mu s$, the duration and decay time is about 12 ms and $24.32 mu s$, respectively; 3) the frequency of TCC distributes at the range of 0∼417 MHz, and the dominant frequency is 5∼20 MHz and 30∼35 MHz.
{"title":"Calculation on the Transient Circulating Current of GIS Enclosure Caused by DS Operation Based on the Exponential Reignition Model of SF6 Gas Discharge","authors":"Xiao-tong Feng, Xixiu Wu, Pengpeng Wan, Qi-chao Zhang, Yu Feng, Hui Hou","doi":"10.1109/ICHVE49031.2020.9279578","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279578","url":null,"abstract":"To clearly understand TCC (transient circulating current), which is one of the most important EMI (electromagnetic interference) source of GIS (gas insulated substation), a research about TCC is carried out. The generation mechanism of TCC is analyzed, and a current transformer coupling method to calculate TCC accurately is presented. Then, this paper focus on setting up the model of SF6 gas discharge, which is the key problem of calculating TCC. According to the impedance variation characteristic of SF6 gas discharge, an exponential reignition model is set up and the typical transient parameters such as amplitude, rise steepness, duration, decay time and frequency are calculated. The results show that: 1) The positive and negative maximum value of TCC with UHV(ultra-high voltage) voltage level is about 129.90 $A$ and −108.37 $A$ respectively, and the positive value of TCC is always larger than that of the negative; 2) the rise steepness of TCC waveform can reach $321.39 A/mu s$, the duration and decay time is about 12 ms and $24.32 mu s$, respectively; 3) the frequency of TCC distributes at the range of 0∼417 MHz, and the dominant frequency is 5∼20 MHz and 30∼35 MHz.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"201 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":"76989286","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/ICHVE49031.2020.9279700
Zheng Zhao, Chenjie Li, Zongze Huang, K. Xu, Jiangtao Li
Decrease in surface insulation capability under repetitive pulses significantly hinder the further enhancement of discharge physics effects, however, fundamental mechanisms of surface flashover under repetitive pulses remain unclear. Developing characteristics of surface streamer and influential mechanisms of memory effects under repetitive submicrosecond pulses were investigated. Both the inception moment and the propagation velocity of subsequent positive surface streamers decrease with increasing the pulse repetition frequency. Enveloping curves of the number of pulses before flashover are similar to the gas gap breakdown. Impacts of space and surface memory effects on the inception and propagation of surface streamers are discussed for repetitive submicrosecond pulses and high-pressure nitrogen.
{"title":"Impacts of space and surface memory effects on streamer dynamics and flashover characteristics under repetitive submicrosecond pulses in nitrogen","authors":"Zheng Zhao, Chenjie Li, Zongze Huang, K. Xu, Jiangtao Li","doi":"10.1109/ICHVE49031.2020.9279700","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279700","url":null,"abstract":"Decrease in surface insulation capability under repetitive pulses significantly hinder the further enhancement of discharge physics effects, however, fundamental mechanisms of surface flashover under repetitive pulses remain unclear. Developing characteristics of surface streamer and influential mechanisms of memory effects under repetitive submicrosecond pulses were investigated. Both the inception moment and the propagation velocity of subsequent positive surface streamers decrease with increasing the pulse repetition frequency. Enveloping curves of the number of pulses before flashover are similar to the gas gap breakdown. Impacts of space and surface memory effects on the inception and propagation of surface streamers are discussed for repetitive submicrosecond pulses and high-pressure nitrogen.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"46 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":"77242765","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/ICHVE49031.2020.9279699
T. Zhao, R. Yao, Yan Wang, Zhixin He, Ming Wu, Jinghui Gao, L. Zhong
Barium titanate-based ceramics Ba(Zr, Ti)O3-x(Ba, Ca)TiO3 (BZT-xBCT) are considered as promising candidate material for piezoelectric sensors due to its superior piezoelectricity and non-toxicity. However, the piezoelectric temperature stability of the BZT-xBCT is poor around phase transition point, which restricts its application in different thermal environments. Therefore, it is crucial to improve the temperature stability of BaTiO3-based piezoelectric sensor. In this work, a laminated structure is proposed to improve the temperature stability of the piezoelectric material, and the piezoelectric coefficient at different temperatures has been measured. The results show that the laminated material in parallel structure exhibits suppressed and expanded peak value in a wide temperature range, which indicates improved temperature stability of piezoelectric property. Our results provide a general approach for developing advanced piezoelectrics with high temperature reliability.
{"title":"Improving the Temperature Stability of BaTiO $3^{-}$ based Piezoelectric Sensor","authors":"T. Zhao, R. Yao, Yan Wang, Zhixin He, Ming Wu, Jinghui Gao, L. Zhong","doi":"10.1109/ICHVE49031.2020.9279699","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279699","url":null,"abstract":"Barium titanate-based ceramics Ba(Zr, Ti)O3-x(Ba, Ca)TiO3 (BZT-xBCT) are considered as promising candidate material for piezoelectric sensors due to its superior piezoelectricity and non-toxicity. However, the piezoelectric temperature stability of the BZT-xBCT is poor around phase transition point, which restricts its application in different thermal environments. Therefore, it is crucial to improve the temperature stability of BaTiO3-based piezoelectric sensor. In this work, a laminated structure is proposed to improve the temperature stability of the piezoelectric material, and the piezoelectric coefficient at different temperatures has been measured. The results show that the laminated material in parallel structure exhibits suppressed and expanded peak value in a wide temperature range, which indicates improved temperature stability of piezoelectric property. Our results provide a general approach for developing advanced piezoelectrics with high temperature reliability.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"491 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":"80995896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The objective of this paper is to quantitatively determine the influence of the residual transverse magnetic field (TMF) on sheath expansion process after current interruption in vacuum. A two-dimensional (2D) particle-in-cell (PIC) model was adopted. The investigated residual TMF ranged from 0 to 300 mT. The simulation results showed that except an ion sheath existing in the sheath expansion period, there appeared an electron sheath, which is formed under the influence of the TMF. Moreover, when there is no residual TMF, the voltage drop mainly applied on the ion sheath. With the application of residual TMF, the voltage drop mainly applied on the electron sheath. Finally, residual TMF has a remarkable blows effect on the electrons. Few electrons diffused to the area between anode and shield under the influence of the residual TMF.
{"title":"Influence of Residual Transverse Magnetic Field on Sheath Expansion Process in Vacuum Interruption","authors":"Feiliang Hu, Shaoweihua Liu, Feng Liu, Hui Ma, Zhiyuan Liu, Yingsan Geng, Jing Peng, Xi Chen","doi":"10.1109/ICHVE49031.2020.9279628","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279628","url":null,"abstract":"The objective of this paper is to quantitatively determine the influence of the residual transverse magnetic field (TMF) on sheath expansion process after current interruption in vacuum. A two-dimensional (2D) particle-in-cell (PIC) model was adopted. The investigated residual TMF ranged from 0 to 300 mT. The simulation results showed that except an ion sheath existing in the sheath expansion period, there appeared an electron sheath, which is formed under the influence of the TMF. Moreover, when there is no residual TMF, the voltage drop mainly applied on the ion sheath. With the application of residual TMF, the voltage drop mainly applied on the electron sheath. Finally, residual TMF has a remarkable blows effect on the electrons. Few electrons diffused to the area between anode and shield under the influence of the residual TMF.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"48 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":"81108113","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/ICHVE49031.2020.9280018
E. T. Staikos, T. Tsovilis
The low-frequency response of metal-oxide varistors, commonly used in telecommunication systems and networks, is investigated. The voltage-current characteristic and capacitance of varistors are obtained experimentally. The effects of frequency on the electrical characteristics of varistors on the pre-breakdown and the breakdown region are presented and discussed. Experimental results can be used for accurate modeling of varistor behavior under low-frequency electromagnetic pulses.
{"title":"Low-frequency response of low-voltage metal-oxide varistors used for telecommunication systems protection","authors":"E. T. Staikos, T. Tsovilis","doi":"10.1109/ICHVE49031.2020.9280018","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9280018","url":null,"abstract":"The low-frequency response of metal-oxide varistors, commonly used in telecommunication systems and networks, is investigated. The voltage-current characteristic and capacitance of varistors are obtained experimentally. The effects of frequency on the electrical characteristics of varistors on the pre-breakdown and the breakdown region are presented and discussed. Experimental results can be used for accurate modeling of varistor behavior under low-frequency electromagnetic pulses.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"121 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":"82978921","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/ICHVE49031.2020.9279946
Xiao Wang, Zefeng Yang, Guoqiang Gao, Hong Wang, Lei Deng, Wenfu Wei
Pantograph is the only device used by trains to obtain power from overhead contact line of high-voltage transmission. The abrasion of the pantograph carbon strip in current-carrying friction is related to various working environments such as rainfall. Carbon strips absorb water to varying degrees in wet condition due to its own pore structure of the material. Extensive field experience shows that the abrasion of carbon strips has increased sharply in wet weather, resulting in its service time is much lower than expected. In severe cases, the abrasion failure of strips will affect the stable current collection during the train operation. Abnormal failure of the contact pair makes the current-carrying friction system unable to meet the real and long-term demands. Therefore, it is of great significance to study the electrical friction behaviors of pantograph carbon strip in the wet condition for ensuring the safe operation of trains and improving the national economy. In this paper, by quantitatively controlling the water content added to the carbon strip to simulate different levels of wet conditions. Using a self-made sliding reciprocating current-carrying friction test bench to study the deterioration rule and damage mechanism of water on the current interface between carbon strip and metal contact wire through changing the water content of the carbon strip, current and normal load. The results show that under the condition of low current, the wear volume and friction coefficient of carbon strips increase first and then decrease with increasing water content added to the strips. It indicates that there is a range of water content, which makes the wear more serious. In addition, under the same water content of the strip, the abrasion situation becomes more serious with the increase of current, and the material transfer phenomenon of copper contact wire on the surface of strips is more obvious. And the increase in normal load tends to slow down the degree of wear. The research content has certain reference significance for the analysis of pantograph strip abrasion failure in wet areas.
{"title":"Effect of Wet Condition on the Wear Performance of Carbon Strip and Metal Contact Wire with Electric Current","authors":"Xiao Wang, Zefeng Yang, Guoqiang Gao, Hong Wang, Lei Deng, Wenfu Wei","doi":"10.1109/ICHVE49031.2020.9279946","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279946","url":null,"abstract":"Pantograph is the only device used by trains to obtain power from overhead contact line of high-voltage transmission. The abrasion of the pantograph carbon strip in current-carrying friction is related to various working environments such as rainfall. Carbon strips absorb water to varying degrees in wet condition due to its own pore structure of the material. Extensive field experience shows that the abrasion of carbon strips has increased sharply in wet weather, resulting in its service time is much lower than expected. In severe cases, the abrasion failure of strips will affect the stable current collection during the train operation. Abnormal failure of the contact pair makes the current-carrying friction system unable to meet the real and long-term demands. Therefore, it is of great significance to study the electrical friction behaviors of pantograph carbon strip in the wet condition for ensuring the safe operation of trains and improving the national economy. In this paper, by quantitatively controlling the water content added to the carbon strip to simulate different levels of wet conditions. Using a self-made sliding reciprocating current-carrying friction test bench to study the deterioration rule and damage mechanism of water on the current interface between carbon strip and metal contact wire through changing the water content of the carbon strip, current and normal load. The results show that under the condition of low current, the wear volume and friction coefficient of carbon strips increase first and then decrease with increasing water content added to the strips. It indicates that there is a range of water content, which makes the wear more serious. In addition, under the same water content of the strip, the abrasion situation becomes more serious with the increase of current, and the material transfer phenomenon of copper contact wire on the surface of strips is more obvious. And the increase in normal load tends to slow down the degree of wear. The research content has certain reference significance for the analysis of pantograph strip abrasion failure in wet areas.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"141 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":"85551312","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/ICHVE49031.2020.9279678
Hongxing Zhang, Xingyi Huang, P. Jiang
The evolution toward apace increasing power density of up-to-date electric equipment and semiconductor technology raises more requirements of high efficiency thermal management materials. In this study, we report polydimethylsiloxane (PDMS) composites containing size-controllable boron nitride nanosheets (BNNSs) as fillers, showing enhanced thermal conductivity yet superb electrical insulating property. At the same filler loading, BNNSs with the smaller size can increase the thermal conductivity of composites more effectively, and this trend becomes more noticeable at the higher filler concentration. Compared with the pristine PDMS, when the load of small size BNNSs reaches 23.1 wt%, the nanocomposite shows a thermal conductivity enhancement of about 300%. Furthermore, it exhibits exceptional electrical insulation.
{"title":"Enhanced Thermal Conductivity of Dielectric Polydimethylsiloxane Composites by Size-Controllable Boron Nitride Nanosheets","authors":"Hongxing Zhang, Xingyi Huang, P. Jiang","doi":"10.1109/ICHVE49031.2020.9279678","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279678","url":null,"abstract":"The evolution toward apace increasing power density of up-to-date electric equipment and semiconductor technology raises more requirements of high efficiency thermal management materials. In this study, we report polydimethylsiloxane (PDMS) composites containing size-controllable boron nitride nanosheets (BNNSs) as fillers, showing enhanced thermal conductivity yet superb electrical insulating property. At the same filler loading, BNNSs with the smaller size can increase the thermal conductivity of composites more effectively, and this trend becomes more noticeable at the higher filler concentration. Compared with the pristine PDMS, when the load of small size BNNSs reaches 23.1 wt%, the nanocomposite shows a thermal conductivity enhancement of about 300%. Furthermore, it exhibits exceptional electrical insulation.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"5 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":"84045163","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/ICHVE49031.2020.9279801
Feiyue Ma, Xiaohui Chen, Chunying He, Xiaoguang Zhu, Jun-bo Deng, H. Ni
The AC filter breaker is one of the primary equipment of a convertor station, mainly functioning as absorbing harmonics and providing the reactive power. Therefore, the AC filters need to change their state frequently following the need of the operation mode of the system and the load. In this paper, first, the model of 750kV AC filters in DC converter stations was built by PSCAD/EMTDC simulation software. Besides, the amplitude of the inrush current and overvoltage and the maximum energy absorption of the closing resistor while closing breakers of different filters were calculated. The result showed that the inrush current generated by the shunt capacitor is the highest, and the overvoltage of the main capacitor C1 is the most serious. Finally, the effects of different resistance value of the closing resistor on inrush current, overvoltage and heat were studied, and it was found that the $400 Omega$ closing resistor is the best choice for the breakers of 750kV AC filters. This paper provided a certain theoretical reference for the selection of the insulation withstanding strength of each component, and proposed a more reasonable resistance value of closing resistors for 750kV AC filter breakers.
{"title":"Research on the Closing Inrush Current and Overvoltage of 750kV AC Filter Breakers","authors":"Feiyue Ma, Xiaohui Chen, Chunying He, Xiaoguang Zhu, Jun-bo Deng, H. Ni","doi":"10.1109/ICHVE49031.2020.9279801","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279801","url":null,"abstract":"The AC filter breaker is one of the primary equipment of a convertor station, mainly functioning as absorbing harmonics and providing the reactive power. Therefore, the AC filters need to change their state frequently following the need of the operation mode of the system and the load. In this paper, first, the model of 750kV AC filters in DC converter stations was built by PSCAD/EMTDC simulation software. Besides, the amplitude of the inrush current and overvoltage and the maximum energy absorption of the closing resistor while closing breakers of different filters were calculated. The result showed that the inrush current generated by the shunt capacitor is the highest, and the overvoltage of the main capacitor C1 is the most serious. Finally, the effects of different resistance value of the closing resistor on inrush current, overvoltage and heat were studied, and it was found that the $400 Omega$ closing resistor is the best choice for the breakers of 750kV AC filters. This paper provided a certain theoretical reference for the selection of the insulation withstanding strength of each component, and proposed a more reasonable resistance value of closing resistors for 750kV AC filter breakers.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"26 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":"84590900","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/ICHVE49031.2020.9279782
Yuxin Zhang, L. Cheng, Yue Ma, Jiang Guo, Wenfeng Liu, Shengtao Li
ZrO2 nanoparticles coated with SiO2 layer were successfully synthesized by tetraethoxysilane (TEOS) hy-anhydride grafted polypropylene matrix to prepare nanocomposite samples with different loadings. The preparation and surface treatment of nanoparticles were further confirmed by transmission electron microscope (TEM) and fourier transform infrared spectrometer (FTIR). Dielectric spectrum and breakdown field strength results showed that the energy storage density of SiO2@ZrO2 core-shell nanocomposite with low dielectric coating gets 10.4% higher than the optimal value of PP/PP-MAH composites filled raw ZrO2, and 42.2% higher than that of PP/PP-MAH composites without nano-filler. Apart from experimental results, thermally stimulated depolarization current test (TSDC) indicated that SiO2 shell layer made the trap depth in interaction region deeper, which consequently improved the breakdown field strength.
{"title":"Improved Breakdown Strength and Energy Storage Properties of Core-shell SiO2@ZrO2/maleic anhydridegrafted polypropylene/polypropylene Ternary Composites","authors":"Yuxin Zhang, L. Cheng, Yue Ma, Jiang Guo, Wenfeng Liu, Shengtao Li","doi":"10.1109/ICHVE49031.2020.9279782","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279782","url":null,"abstract":"ZrO2 nanoparticles coated with SiO2 layer were successfully synthesized by tetraethoxysilane (TEOS) hy-anhydride grafted polypropylene matrix to prepare nanocomposite samples with different loadings. The preparation and surface treatment of nanoparticles were further confirmed by transmission electron microscope (TEM) and fourier transform infrared spectrometer (FTIR). Dielectric spectrum and breakdown field strength results showed that the energy storage density of SiO2@ZrO2 core-shell nanocomposite with low dielectric coating gets 10.4% higher than the optimal value of PP/PP-MAH composites filled raw ZrO2, and 42.2% higher than that of PP/PP-MAH composites without nano-filler. Apart from experimental results, thermally stimulated depolarization current test (TSDC) indicated that SiO2 shell layer made the trap depth in interaction region deeper, which consequently improved the breakdown field strength.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"89 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":"73118767","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/ICHVE49031.2020.9279483
Xing Li, Weidong Liu, Yuan Xu
Partial discharge (PD) is not only an important sign of insulation deterioration, but also an important means to detect insulation defects. However, recent operation experience shows that there may be some limitations for the conventional PD detection method, which will result in detection failure. In this paper, a high-sensitivity detection system was established, and the screening tests for the 1100 kV insulators were carried out. Under the PD test condition, the discharge level of good insulators was obtained. Additionally, the experiments of simulated defects and actual defects on the insulator surface were carried out. The results show that under the PD test condition, for the 1100 kV good insulators, the intrinsic PD level is smaller than 0.1 pC. For some micro defects, such as the polish and dirt contaminant on the insulator surface, they will not induce PDs, or even if they provoke PDs, the PDs are only approximately 0.1 pC and even much lower than 0.1 pC. The discharge level of defects such as micro metal particles and cracks on the insulator surface is generally smaller than 1 pC (lower than the conventional detection sensitivity), indicating that there is indeed detection limitation of the conventional detection method. This paper is of great interest for further understanding the intrinsic PD level of good insulators as well as the detection effectiveness of conventional PD detection methods.
{"title":"Partial Discharge Detection of insultors in GIS: Effectiveness and Limitation","authors":"Xing Li, Weidong Liu, Yuan Xu","doi":"10.1109/ICHVE49031.2020.9279483","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279483","url":null,"abstract":"Partial discharge (PD) is not only an important sign of insulation deterioration, but also an important means to detect insulation defects. However, recent operation experience shows that there may be some limitations for the conventional PD detection method, which will result in detection failure. In this paper, a high-sensitivity detection system was established, and the screening tests for the 1100 kV insulators were carried out. Under the PD test condition, the discharge level of good insulators was obtained. Additionally, the experiments of simulated defects and actual defects on the insulator surface were carried out. The results show that under the PD test condition, for the 1100 kV good insulators, the intrinsic PD level is smaller than 0.1 pC. For some micro defects, such as the polish and dirt contaminant on the insulator surface, they will not induce PDs, or even if they provoke PDs, the PDs are only approximately 0.1 pC and even much lower than 0.1 pC. The discharge level of defects such as micro metal particles and cracks on the insulator surface is generally smaller than 1 pC (lower than the conventional detection sensitivity), indicating that there is indeed detection limitation of the conventional detection method. This paper is of great interest for further understanding the intrinsic PD level of good insulators as well as the detection effectiveness of conventional PD detection methods.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"47 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":"73173940","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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