Converter transformer is the most important equipment in DC transmission system. Polarity reversal is a special working condition of converter transformer in service, and the polarity reversal test is also generally regarded as the most important experiment for converter transformer. In the calculation of the polarity reversal field, the permittivity and conductivity of the each dielectric material should be given. The insulation materials of converter transformer are oil and pressboard. The resistivity of pressboard is anisotropic, there is a great difference value between the directions of through and along the paper layer. Different polarity reversal durations have different experiment results during polarity reversal test process. In this paper, the electric field distribution of converter transformer valve side winding in a practical ±800 converter transformer under polarity reversal test voltage was calculated with field-circuit coupling method. The anisotropism of paperboard resistivity was taken into account during the calculation process. In order to analyse the influence of polarity reversal duration to the distribution of electric field, several different polarity reversal durations were set to contrast. The results of this paper could provide references for the research and design of converter transformer.
{"title":"Research on transient electric field distribution of converter transformer valve side winding under polarity reversal","authors":"Zhang Liang-xian, Zhang Qi-min, Chen Mo-sheng, Pen Zong-ren","doi":"10.1109/CEIDP.2013.6747085","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747085","url":null,"abstract":"Converter transformer is the most important equipment in DC transmission system. Polarity reversal is a special working condition of converter transformer in service, and the polarity reversal test is also generally regarded as the most important experiment for converter transformer. In the calculation of the polarity reversal field, the permittivity and conductivity of the each dielectric material should be given. The insulation materials of converter transformer are oil and pressboard. The resistivity of pressboard is anisotropic, there is a great difference value between the directions of through and along the paper layer. Different polarity reversal durations have different experiment results during polarity reversal test process. In this paper, the electric field distribution of converter transformer valve side winding in a practical ±800 converter transformer under polarity reversal test voltage was calculated with field-circuit coupling method. The anisotropism of paperboard resistivity was taken into account during the calculation process. In order to analyse the influence of polarity reversal duration to the distribution of electric field, several different polarity reversal durations were set to contrast. The results of this paper could provide references for the research and design of converter transformer.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124796061","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748257
J. Yang, X. Wang, C. Zheng, H. Zhao, Q. Lei
In order to understand the change rule and its mechanism for the space charge property of Magnesium oxide (MgO)/ LDPE nanocomposites after damp, the moisture absorption weight and space charge properties of wet LDPE and MgO/LDPE were studied. Experiments results show that moisture absorption has a strong influence on dielectric properties of MgO/LDPE nanocomposite. After nanocomposite had been exposed for a week under the 40% relative humidity conditions, the improved space charge property of the composite at high electric field above 20kV/mm, were decreased obviously compare to dry MgO/LDPE. It is believed that moisture absorption may lead to a weakening of original interfacial charge distribution. On contrary, at low electric field, the MgO/LDPE system showed the strong suppression effect of aditional carriers migration caused by absorbed moisture.
{"title":"Influence of moisture absorption on space charge property of MgO/LDPE nanocomposite","authors":"J. Yang, X. Wang, C. Zheng, H. Zhao, Q. Lei","doi":"10.1109/CEIDP.2013.6748257","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748257","url":null,"abstract":"In order to understand the change rule and its mechanism for the space charge property of Magnesium oxide (MgO)/ LDPE nanocomposites after damp, the moisture absorption weight and space charge properties of wet LDPE and MgO/LDPE were studied. Experiments results show that moisture absorption has a strong influence on dielectric properties of MgO/LDPE nanocomposite. After nanocomposite had been exposed for a week under the 40% relative humidity conditions, the improved space charge property of the composite at high electric field above 20kV/mm, were decreased obviously compare to dry MgO/LDPE. It is believed that moisture absorption may lead to a weakening of original interfacial charge distribution. On contrary, at low electric field, the MgO/LDPE system showed the strong suppression effect of aditional carriers migration caused by absorbed moisture.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122361054","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6747100
M. E. El Bahy, S. Ward, R. Morsi, M. Badawi
A method is presented for detecting and identifying the shape and size of a contaminating metallic particle in gas insulated system (GIS). A fixed particle-initiated negative corona in air insulated co-axial cylindrical configuration is investigated at a voltage slightly above the corona onset level. The characteristics of the negative corona pulses (Trichel pulses) are calculated by mathematical modeling the process taking place during the negative corona discharge. An experimental set-up is built up to measure the Trichel pulse characteristics and to check the accuracy of the present calculation. The calculated values of corona Trichel pulse amplitudes and repetition rates agree well with the measured values. So, the Trichel pulse characteristics are calculated for different particle sizes and shapes. These data of pulses are used as a bias for designing and training the artificial neural network technique (ANN). For earlier detection of insulation defect, the Trichel pulse characteristics are measured and then given as an input data to the trained ANN. Then, we could identify the particle shape and size.
{"title":"Identification of contaminating particle geometry in a co-axial configuration using trichel pulse characteristics","authors":"M. E. El Bahy, S. Ward, R. Morsi, M. Badawi","doi":"10.1109/CEIDP.2013.6747100","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747100","url":null,"abstract":"A method is presented for detecting and identifying the shape and size of a contaminating metallic particle in gas insulated system (GIS). A fixed particle-initiated negative corona in air insulated co-axial cylindrical configuration is investigated at a voltage slightly above the corona onset level. The characteristics of the negative corona pulses (Trichel pulses) are calculated by mathematical modeling the process taking place during the negative corona discharge. An experimental set-up is built up to measure the Trichel pulse characteristics and to check the accuracy of the present calculation. The calculated values of corona Trichel pulse amplitudes and repetition rates agree well with the measured values. So, the Trichel pulse characteristics are calculated for different particle sizes and shapes. These data of pulses are used as a bias for designing and training the artificial neural network technique (ANN). For earlier detection of insulation defect, the Trichel pulse characteristics are measured and then given as an input data to the trained ANN. Then, we could identify the particle shape and size.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129389703","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748144
M. Salam, S. Ang, B. T. Ong, O. A. Malik, W. Voon, M. Alinurrezan
The presence of unwanted constituent on insulator surface of transmission tower plays an important ignition property for the likelihood of occurrence of flashover. In this paper, the pollution level of two aged insulators namely the longrod silicon rubber and the cap-and-pin glass insulators are measured. The results from the measurement shows that the Equivalent Salt Deposit Density (ESDD) of the cap-and-pin glass insulator, particularly near the pin is found to be 0.169 mg/cm2 while the composition over the cap surface is 0.136 mg/cm2. For the case of longrod silicon rubber insulator, the ESDD for both the pin and the cap are found to be 0.063 mg/cm2 and 0.016 mg/cm2 respectively. The outcomes from the ESDD measurements suggest that the cap-and-pin glass insulator string is severely contaminated with salt spray as compared to the longrod silicon rubber. Furthermore, a mathematical model of ESDD expressed in terms of salinity and temperature for both insulators is derived from multivariable regression method. The coefficients for both the cap-and-pin glass and longrod silicon rubber insulator are found to be 0.9984 and 0.9867 respectively.
{"title":"Measurement of pollution level of 66 kV transmission line insulators","authors":"M. Salam, S. Ang, B. T. Ong, O. A. Malik, W. Voon, M. Alinurrezan","doi":"10.1109/CEIDP.2013.6748144","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748144","url":null,"abstract":"The presence of unwanted constituent on insulator surface of transmission tower plays an important ignition property for the likelihood of occurrence of flashover. In this paper, the pollution level of two aged insulators namely the longrod silicon rubber and the cap-and-pin glass insulators are measured. The results from the measurement shows that the Equivalent Salt Deposit Density (ESDD) of the cap-and-pin glass insulator, particularly near the pin is found to be 0.169 mg/cm2 while the composition over the cap surface is 0.136 mg/cm2. For the case of longrod silicon rubber insulator, the ESDD for both the pin and the cap are found to be 0.063 mg/cm2 and 0.016 mg/cm2 respectively. The outcomes from the ESDD measurements suggest that the cap-and-pin glass insulator string is severely contaminated with salt spray as compared to the longrod silicon rubber. Furthermore, a mathematical model of ESDD expressed in terms of salinity and temperature for both insulators is derived from multivariable regression method. The coefficients for both the cap-and-pin glass and longrod silicon rubber insulator are found to be 0.9984 and 0.9867 respectively.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1993 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131004833","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748197
Zheng Dianchun, W. Zhengwei, Cheng Chuntian, Y. Weiguo
Liquid dielectrics are widely used as insulating medium in the electrical insulation system, and often withstand various impulse voltage occurrences of discharge. To understand the physical behaviors of discharge phenomena in dielectric liquid, adopting needle-sphere electrode geometry in this paper, the dynamic state of streamer and the dynamic characteristics of charged particles in liquid dielectric are investigated under lightning impulse voltage. The change process of positive ions, negative ions, and electrons with the formation and development of the streamer are described by two-dimensional continuity equations, and coupled with the Poisson's equation described the electric field strength. The research results show that, during the process of impulse rise, the movement of the free charge generated by liquid molecule ionization only near the sharp needle electrode, the streamer generated by migration of the electric field propagates towards liquid-gap slowly as well. However, the streamer velocity increases an order of magnitude when a critical voltage is reached, then the streamer will accelerate development towards sphere electrode. We also find that in liquid dielectric at the same peak voltage, rise times influence the shape and velocity of the streamers. According to these conclusions enable ones easily understand breakdown mechanism of the liquid dielectrics that are reasonably applied to power system fields.
{"title":"Discharge characteristics of streamer in liquid dielectric under lightning impulse voltage","authors":"Zheng Dianchun, W. Zhengwei, Cheng Chuntian, Y. Weiguo","doi":"10.1109/CEIDP.2013.6748197","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748197","url":null,"abstract":"Liquid dielectrics are widely used as insulating medium in the electrical insulation system, and often withstand various impulse voltage occurrences of discharge. To understand the physical behaviors of discharge phenomena in dielectric liquid, adopting needle-sphere electrode geometry in this paper, the dynamic state of streamer and the dynamic characteristics of charged particles in liquid dielectric are investigated under lightning impulse voltage. The change process of positive ions, negative ions, and electrons with the formation and development of the streamer are described by two-dimensional continuity equations, and coupled with the Poisson's equation described the electric field strength. The research results show that, during the process of impulse rise, the movement of the free charge generated by liquid molecule ionization only near the sharp needle electrode, the streamer generated by migration of the electric field propagates towards liquid-gap slowly as well. However, the streamer velocity increases an order of magnitude when a critical voltage is reached, then the streamer will accelerate development towards sphere electrode. We also find that in liquid dielectric at the same peak voltage, rise times influence the shape and velocity of the streamers. According to these conclusions enable ones easily understand breakdown mechanism of the liquid dielectrics that are reasonably applied to power system fields.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129775746","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748214
Z. Tao, Liu Xiaoqin, Ma Fei-lin, Sun Liuxue
Return voltage measurement is an effective dielectric response test method and has been used to evaluate aging condition of solid insulation. The dominant time constant is one of the most common characteristic quantities for assessing the moisture of the transformer. However, the return voltage curve maybe appear multiple peaks due to many factors in the process of field test, which affects the accurate judgment of the dominant time constant, therefore, it is difficult to evaluate transformer solid insulation condition by polarization spectrum and the dominant time constant. This paper analyzes the relationship between the return voltage characteristics and parameters of the equivalent circuit based on extended Debye model to better understand the variation rule of the polarization spectrum. According to the simulation results, some new ideas of diagnosing solid insulation condition are proposed. The results show that the method proposed in this paper is reasonable and effective.
{"title":"Insulation condition diagnosis of transformer with multi-peak polarization spectrum","authors":"Z. Tao, Liu Xiaoqin, Ma Fei-lin, Sun Liuxue","doi":"10.1109/CEIDP.2013.6748214","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748214","url":null,"abstract":"Return voltage measurement is an effective dielectric response test method and has been used to evaluate aging condition of solid insulation. The dominant time constant is one of the most common characteristic quantities for assessing the moisture of the transformer. However, the return voltage curve maybe appear multiple peaks due to many factors in the process of field test, which affects the accurate judgment of the dominant time constant, therefore, it is difficult to evaluate transformer solid insulation condition by polarization spectrum and the dominant time constant. This paper analyzes the relationship between the return voltage characteristics and parameters of the equivalent circuit based on extended Debye model to better understand the variation rule of the polarization spectrum. According to the simulation results, some new ideas of diagnosing solid insulation condition are proposed. The results show that the method proposed in this paper is reasonable and effective.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124618705","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748308
Liang Xie, Qiming Ye
The minimum air gap distance of UHVAC substation is controlled by the switching pulse voltage. In the past, the minimum air gap distance is decided by the test result under standard switching pulse voltage. The using of long front-time pulse voltage generator can get the air-gaps discharge characteristic, which is more similar in UHVAC system. In this case, the design of UHV substation is not only safe, but also economical. In this paper, the air gap between several typical electrodes and ground in UHVAC substation, including the conductors to ground, the grading ring to ground, is tested under the voltage, whose waveform is standard switching pulse voltage, 1000μs long front-time switching pulse voltage and 2500μs very long front-time switching impulse voltage. The key curve of the air-gaps discharge characteristic is received. The different of discharge voltage under several front-time switching impulse voltages is studied, and the effect of switching pulse voltage's front-time on the discharge voltage of air gap is received. The result shows that the discharge voltage is increasing by the fronttime extending, but growth rate is decreasing by the air gap distance lengthening.
{"title":"The air-gaps discharge characteristic of UHV AC substation under switching impulse voltage","authors":"Liang Xie, Qiming Ye","doi":"10.1109/CEIDP.2013.6748308","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748308","url":null,"abstract":"The minimum air gap distance of UHVAC substation is controlled by the switching pulse voltage. In the past, the minimum air gap distance is decided by the test result under standard switching pulse voltage. The using of long front-time pulse voltage generator can get the air-gaps discharge characteristic, which is more similar in UHVAC system. In this case, the design of UHV substation is not only safe, but also economical. In this paper, the air gap between several typical electrodes and ground in UHVAC substation, including the conductors to ground, the grading ring to ground, is tested under the voltage, whose waveform is standard switching pulse voltage, 1000μs long front-time switching pulse voltage and 2500μs very long front-time switching impulse voltage. The key curve of the air-gaps discharge characteristic is received. The different of discharge voltage under several front-time switching impulse voltages is studied, and the effect of switching pulse voltage's front-time on the discharge voltage of air gap is received. The result shows that the discharge voltage is increasing by the fronttime extending, but growth rate is decreasing by the air gap distance lengthening.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117061075","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6747463
Yujia Cheng, N. Guo, Ru Wang, Xiaohong Zhang
The dielectric properties of Nano-composites has attract tremendous attention during the past decade. In present paper, the silane coupling agent (KH-570) and titanate coupling agent (105, 101, TC-F) is used as modifiers. The nanometer zinc oxide which has been modified by KH-570 or TC-F etc is added to the low density polyethylene. In the end, the electrical breakdown properties of the composites are investigated. The test results show that when the content of nano-ZnO was 3%, breakdown field strength of the composites is higher than origin LDPE 11%. The smaller ZnO particles in size, the higher breakdown strength of the nano-composite with the same content of nano-ZnO is. The breakdown strength of nano-composites with nano-ZnO which is treated by silane coupling agent (KH-570) is higher than those with nano-ZnO treated by titanate coupling agent. It can be found that combination of nanometer zinc oxide and polyethylene macromolecular chain is effectively improved by infrared spectrum.
{"title":"Investigation on breakdown properties of low-density polyethylene / nano-ZnO composites","authors":"Yujia Cheng, N. Guo, Ru Wang, Xiaohong Zhang","doi":"10.1109/CEIDP.2013.6747463","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747463","url":null,"abstract":"The dielectric properties of Nano-composites has attract tremendous attention during the past decade. In present paper, the silane coupling agent (KH-570) and titanate coupling agent (105, 101, TC-F) is used as modifiers. The nanometer zinc oxide which has been modified by KH-570 or TC-F etc is added to the low density polyethylene. In the end, the electrical breakdown properties of the composites are investigated. The test results show that when the content of nano-ZnO was 3%, breakdown field strength of the composites is higher than origin LDPE 11%. The smaller ZnO particles in size, the higher breakdown strength of the nano-composite with the same content of nano-ZnO is. The breakdown strength of nano-composites with nano-ZnO which is treated by silane coupling agent (KH-570) is higher than those with nano-ZnO treated by titanate coupling agent. It can be found that combination of nanometer zinc oxide and polyethylene macromolecular chain is effectively improved by infrared spectrum.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126172715","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6747419
Hui Jiang, T. Shao, Cheng Zhang, P. Yan, Zheng Niu, Yixiao Zhou
Surface dielectric barrier discharges with five different grounded electrode's widths are produced in order to investigate the effect of grounded electrode's width on electrical characteristics. The electrical parameters including applied voltage, total discharge current and transported charges are measured and calculated, respectively. Results show that the total discharge current has two obvious spikes. The first current spike of the total current has a peak which results in some fluctuations of transported charges in V-Q Lissajous figures, but the peak of the first current spike hardly changes with the electrode's width. The second spike peak value increases with the electrode's width, and reaches its maximum at an optimum width. All the V-Q loops at different electrode's widths are “almond-shape”, and the transported charges and energy per pulse increase with the electrode's width. The main plasma action area increases with the electrode's width, but keeps relatively constant when the grounded electrode's width is larger than the optimum width. In addition, the grounded electrode's width has no obvious influence on the plasma light intensity.
{"title":"Effect of grounded electrode's width on electrical characteristics of nanosecond-pulse surface DBD","authors":"Hui Jiang, T. Shao, Cheng Zhang, P. Yan, Zheng Niu, Yixiao Zhou","doi":"10.1109/CEIDP.2013.6747419","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747419","url":null,"abstract":"Surface dielectric barrier discharges with five different grounded electrode's widths are produced in order to investigate the effect of grounded electrode's width on electrical characteristics. The electrical parameters including applied voltage, total discharge current and transported charges are measured and calculated, respectively. Results show that the total discharge current has two obvious spikes. The first current spike of the total current has a peak which results in some fluctuations of transported charges in V-Q Lissajous figures, but the peak of the first current spike hardly changes with the electrode's width. The second spike peak value increases with the electrode's width, and reaches its maximum at an optimum width. All the V-Q loops at different electrode's widths are “almond-shape”, and the transported charges and energy per pulse increase with the electrode's width. The main plasma action area increases with the electrode's width, but keeps relatively constant when the grounded electrode's width is larger than the optimum width. In addition, the grounded electrode's width has no obvious influence on the plasma light intensity.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121868044","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 : 2013-10-01DOI: 10.1109/CEIDP.2013.6748132
Ling Luo, Fuzeng Zhang, Yining Wang, H. Mei, Y. Liao, Liming Wang, Z. Guan, Licheng Li
Chusui dc transmission line is the world's first ±800kV transmission line in China. 2011 March, gossans of ceramic insulators on ±800kV Chusui dc transmission line appeared electrochemical corrosion at Qujing region in Yunnan province. The corrosion phenomenon concentrated in V-string insulators on negative polarity side. This article describes the basic electrochemical corrosion situation of ceramic insulators. In order to analyze the mechanical and electrical characteristics of electrochemical corrosion ceramic insulators of ±800kV Chusui transmission line, insulation resistance test, mechanical and electrical load destructive test and natural contamination flashover test had been done in National Engineering Laboratory for Ultra High Voltage Engineering Technology (Kunming). Test results indicate that gossans' electrochemical corrosion problem didn't obviously decrease insulators' mechanical and electrical characteristic currently. The electrochemical corrosion insulators still satisfy transmission line's operation requirements. Meanwhile, contamination degree of electrochemical corrosion insulators whose surface is divided into three parts had been measured respectively. Measurement results indicate the contamination severity of electrochemical corrosion products accumulated area on ceramic insulators' surface is much heavier than other area, which indicates that ceramic insulators' gossans electromechanical corrosion would aggravate contamination accumulation. It is necessary to take measures to suppress ceramic insulators gossans electrochemical corrosion.
{"title":"Study on mechanical and electrical characteristics of gossans electrochemical corrosion ceramic insulators on DC transmission line","authors":"Ling Luo, Fuzeng Zhang, Yining Wang, H. Mei, Y. Liao, Liming Wang, Z. Guan, Licheng Li","doi":"10.1109/CEIDP.2013.6748132","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748132","url":null,"abstract":"Chusui dc transmission line is the world's first ±800kV transmission line in China. 2011 March, gossans of ceramic insulators on ±800kV Chusui dc transmission line appeared electrochemical corrosion at Qujing region in Yunnan province. The corrosion phenomenon concentrated in V-string insulators on negative polarity side. This article describes the basic electrochemical corrosion situation of ceramic insulators. In order to analyze the mechanical and electrical characteristics of electrochemical corrosion ceramic insulators of ±800kV Chusui transmission line, insulation resistance test, mechanical and electrical load destructive test and natural contamination flashover test had been done in National Engineering Laboratory for Ultra High Voltage Engineering Technology (Kunming). Test results indicate that gossans' electrochemical corrosion problem didn't obviously decrease insulators' mechanical and electrical characteristic currently. The electrochemical corrosion insulators still satisfy transmission line's operation requirements. Meanwhile, contamination degree of electrochemical corrosion insulators whose surface is divided into three parts had been measured respectively. Measurement results indicate the contamination severity of electrochemical corrosion products accumulated area on ceramic insulators' surface is much heavier than other area, which indicates that ceramic insulators' gossans electromechanical corrosion would aggravate contamination accumulation. It is necessary to take measures to suppress ceramic insulators gossans electrochemical corrosion.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"354 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120958271","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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