Pub Date : 2019-06-01DOI: 10.1109/EIC43217.2019.9046602
Meng Chen, Y. Yin, Hongliang Zhang, Z. Gao, Zhuang Ma, Jiandong Wu
It is well-known that space charge accumulates easily in polyethylene in the presence of crosslinking byproducts. Acetophenone is one of the mainly byproducts produced after crosslinking with dicumyl peroxide (DCP). This paper intended to investigate the mechanism of space charge formation with the existence of acetophenone in polyethylene. The addictive-free low density polyethylene (LDPE) sheets and the LDPE soaked into acetophenone for 24 hours (referred as L-AP) with $mathbf{300}mumathbf{m}$ thickness were prepared. The space charge distribution and high field conduction characteristics were measured in both untreated LDPE (referred as L-u) and L-AP. In the space charge measurement using pulsed electroacoustic (PEA) technique, three relatively low DC electric fields, 5, 7, and 10 kV/mm were applied subsequently at 298 K and 323 K. It is generally acknowledged that no obvious space charge can be observed under these fields in LDPE. In the high field conduction measurement, samples were stressed under DC electric field at the same temperature. Gas chromatography-mass spectrometry (GC-MS) was employed before and after space charge test to investigate the variation of acetophenone. According to the space charge distribution in L-AP, negative charges started to appear under 5 kV/ mm in the vicinity of the anode at 298 K and positive charges dominated the bulk of the sample at 323 K. The acetophenone content decreased during the space charge test from GC-MS result. Acetophenone changed the pattern of space charge in LDPE, which became more obvious at high temperature. According to the conduction measurement results, the dissociation of acetophenone brought about more free charges and changed the conduction mechanism in polymer.
{"title":"Effects of Acetophenone on Charge Dynamics in Low Density Polyethylene","authors":"Meng Chen, Y. Yin, Hongliang Zhang, Z. Gao, Zhuang Ma, Jiandong Wu","doi":"10.1109/EIC43217.2019.9046602","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046602","url":null,"abstract":"It is well-known that space charge accumulates easily in polyethylene in the presence of crosslinking byproducts. Acetophenone is one of the mainly byproducts produced after crosslinking with dicumyl peroxide (DCP). This paper intended to investigate the mechanism of space charge formation with the existence of acetophenone in polyethylene. The addictive-free low density polyethylene (LDPE) sheets and the LDPE soaked into acetophenone for 24 hours (referred as L-AP) with $mathbf{300}mumathbf{m}$ thickness were prepared. The space charge distribution and high field conduction characteristics were measured in both untreated LDPE (referred as L-u) and L-AP. In the space charge measurement using pulsed electroacoustic (PEA) technique, three relatively low DC electric fields, 5, 7, and 10 kV/mm were applied subsequently at 298 K and 323 K. It is generally acknowledged that no obvious space charge can be observed under these fields in LDPE. In the high field conduction measurement, samples were stressed under DC electric field at the same temperature. Gas chromatography-mass spectrometry (GC-MS) was employed before and after space charge test to investigate the variation of acetophenone. According to the space charge distribution in L-AP, negative charges started to appear under 5 kV/ mm in the vicinity of the anode at 298 K and positive charges dominated the bulk of the sample at 323 K. The acetophenone content decreased during the space charge test from GC-MS result. Acetophenone changed the pattern of space charge in LDPE, which became more obvious at high temperature. According to the conduction measurement results, the dissociation of acetophenone brought about more free charges and changed the conduction mechanism in polymer.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134500371","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046579
S. Morsalin, B. Phung, M. Danikas
As a promising alternative to conventional high voltage AC testing at PF (power frequency 50/60 Hz), VLF (very-low-frequency, typically 0.1 Hz) testing is nowadays used in practice. The increasing application of VLF testing for condition assessment of power apparatus necessitates understanding the partial discharge (PD) behaviors at this frequency. In this paper, the influence of cavity geometry on PD activities is investigated. A comparative experimental study is carried out with PF and VLF voltage excitations for different void structures (cylindrical, block, prism). Measurement results are presented with phase-resolved discharge patterns and integrated parameters such as average void discharge, repetition rates, etc. Under the same applied overstress relative to inception voltage, measurement results show that void discharges are strongly dependent on the cavity geometry as well as excitation frequency. With increasing cavity volume, PDs are more likely to occur and in particular, VLF excitation yields lower discharge magnitude, repetition rate and the phase range of occurrence.
{"title":"Influence of Cavity Geometry on Partial Discharge Measurement at Very Low Frequency","authors":"S. Morsalin, B. Phung, M. Danikas","doi":"10.1109/EIC43217.2019.9046579","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046579","url":null,"abstract":"As a promising alternative to conventional high voltage AC testing at PF (power frequency 50/60 Hz), VLF (very-low-frequency, typically 0.1 Hz) testing is nowadays used in practice. The increasing application of VLF testing for condition assessment of power apparatus necessitates understanding the partial discharge (PD) behaviors at this frequency. In this paper, the influence of cavity geometry on PD activities is investigated. A comparative experimental study is carried out with PF and VLF voltage excitations for different void structures (cylindrical, block, prism). Measurement results are presented with phase-resolved discharge patterns and integrated parameters such as average void discharge, repetition rates, etc. Under the same applied overstress relative to inception voltage, measurement results show that void discharges are strongly dependent on the cavity geometry as well as excitation frequency. With increasing cavity volume, PDs are more likely to occur and in particular, VLF excitation yields lower discharge magnitude, repetition rate and the phase range of occurrence.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133839112","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046533
Aws Al-Taie, Chanyeop Park, P. Cheetham, C. Kim, L. Graber, S. Pamidi
A new method to represent Paschen's law to estimate the dielectric strength of gaseous media over a wide range of temperatures is presented. In the new representation the breakdown strength is a function of the product of gas mass density and gap distance between the electrodes (p.d) rather than the product of gas pressure and gap distance (p.d) used in the standard form. The necessity of the new representation is articulated based on the fact that the dielectric strength of a gaseous medium scales with density, and the density depends not on the pressure alone, but also on the temperature. Representing Paschen's law using mass density accounts for the dependence of dielectric strength on the temperature and pressure of the gas, and facilitates its application for estimations of dielectric strength of gas media at any temperature and pressure. The application and the necessity of the new representation is demonstrated using the test case of gas cooled high temperature superconducting power devices that operate at variable temperature and pressure.
{"title":"A New Representation of Paschen's Law Suitable for Variable Temperature Power Applications","authors":"Aws Al-Taie, Chanyeop Park, P. Cheetham, C. Kim, L. Graber, S. Pamidi","doi":"10.1109/EIC43217.2019.9046533","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046533","url":null,"abstract":"A new method to represent Paschen's law to estimate the dielectric strength of gaseous media over a wide range of temperatures is presented. In the new representation the breakdown strength is a function of the product of gas mass density and gap distance between the electrodes (p.d) rather than the product of gas pressure and gap distance (p.d) used in the standard form. The necessity of the new representation is articulated based on the fact that the dielectric strength of a gaseous medium scales with density, and the density depends not on the pressure alone, but also on the temperature. Representing Paschen's law using mass density accounts for the dependence of dielectric strength on the temperature and pressure of the gas, and facilitates its application for estimations of dielectric strength of gas media at any temperature and pressure. The application and the necessity of the new representation is demonstrated using the test case of gas cooled high temperature superconducting power devices that operate at variable temperature and pressure.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131668646","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046518
Ziqing Guo, Qizheng Ye, Yuwei Wang
In terms of optical image digital processing of gas discharge, the morphological research is mainly engaged in the image of UV, which has relatively few studies on discharge state by using grayscale texture information of visible images. Thanks to the progress of photoelectric detecting technique, the visible image contains more abundant space structure information, which makes it possible to detect the characteristic of grayscale texture information. In this paper, the 50Hz AC high voltage power source was applied to the 15mm needle-plane gap under room temperature and atmospheric pressure. The discharge images in the time scale of seconds were obtained by a high resolution digital camera. We introduce the research method of gray-level co-occurrence matrix into the corona discharge image processing. Contrast, entropy, correlation and the expected value ratio of vertical (90°) and horizontal (0°) directions are used to describe the state of corona development. The calculation results show that the contrast and entropy can effectively reflect the corona pre-breakdown state, and the correlation can effectively reflect the initial state. The expected value ratio can effectively reflect the process of growth, suppression, and gap-penetration of the discharge in the positive half cycle, which has a good correlation with the oscilloscope electrical signals. The method allows us to take advantage of visible light images to study the stages of AC corona, which provides a new method of low temperature plasma diagnostics.
{"title":"Research on Stages of AC corona discharge Based on Visible Digital Images Gray-level Co-occurrence Matrix","authors":"Ziqing Guo, Qizheng Ye, Yuwei Wang","doi":"10.1109/EIC43217.2019.9046518","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046518","url":null,"abstract":"In terms of optical image digital processing of gas discharge, the morphological research is mainly engaged in the image of UV, which has relatively few studies on discharge state by using grayscale texture information of visible images. Thanks to the progress of photoelectric detecting technique, the visible image contains more abundant space structure information, which makes it possible to detect the characteristic of grayscale texture information. In this paper, the 50Hz AC high voltage power source was applied to the 15mm needle-plane gap under room temperature and atmospheric pressure. The discharge images in the time scale of seconds were obtained by a high resolution digital camera. We introduce the research method of gray-level co-occurrence matrix into the corona discharge image processing. Contrast, entropy, correlation and the expected value ratio of vertical (90°) and horizontal (0°) directions are used to describe the state of corona development. The calculation results show that the contrast and entropy can effectively reflect the corona pre-breakdown state, and the correlation can effectively reflect the initial state. The expected value ratio can effectively reflect the process of growth, suppression, and gap-penetration of the discharge in the positive half cycle, which has a good correlation with the oscilloscope electrical signals. The method allows us to take advantage of visible light images to study the stages of AC corona, which provides a new method of low temperature plasma diagnostics.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131697814","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046623
S. Ilhan, D. Tuzun, A. Ozdemir
This paper presents tracking and erosion performance of high temperature vulcanizing (HTV) silicone rubber (SIR) materials for different filler loadings. Different concentrations of alumina trihydrate (ATH) filler particles of $3.6 mumathrm{m}$ median size and silica (SiO2) filler particles of $4 mumathrm{m}$ median size are considered together with HTV-SIR material. Tracking and erosion performance of the compositions were evaluated by using standard inclined plane (IP) tracking and erosion tests, according to IEe 60587 standard. IP tests are performed at 3.5 kV power frequency (50 Hz) constant test voltages, for 0.3 ml/min contamination flow rate, at an ambient temperature of $pmb{23}pm pmb{2} {}^{circ}mathbf{C}$, and for six hours of test periods. Time-to-failures, eroded masses, and leakage currents of HTV-SIR filled with ATH and silica particles are investigated for different filler concentrations.
研究了不同填料用量下高温硫化硅橡胶(SIR)材料的跟踪和腐蚀性能。在hhtv - sir材料中考虑了不同浓度的中位数尺寸为3.6 mu mathm {m}$的三水合氧化铝(ATH)填充颗粒和中位数尺寸为4 mu mathm {m}$的二氧化硅(SiO2)填充颗粒。根据ie60587标准，采用标准斜面跟踪和冲蚀试验对组合物的跟踪和冲蚀性能进行了评价。IP测试在3.5 kV工频(50 Hz)恒定测试电压下进行，污染流速为0.3 ml/min，环境温度为$pmb{23}pm pmb{2} {}^{circ}mathbf{C}$，测试周期为6小时。研究了不同填料浓度下填充ATH和二氧化硅颗粒的HTV-SIR的失效时间、侵蚀质量和泄漏电流。
{"title":"Electrical Performance of HTV Silicone Rubber under Different Fillers and Filler Loadings","authors":"S. Ilhan, D. Tuzun, A. Ozdemir","doi":"10.1109/EIC43217.2019.9046623","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046623","url":null,"abstract":"This paper presents tracking and erosion performance of high temperature vulcanizing (HTV) silicone rubber (SIR) materials for different filler loadings. Different concentrations of alumina trihydrate (ATH) filler particles of $3.6 mumathrm{m}$ median size and silica (SiO2) filler particles of $4 mumathrm{m}$ median size are considered together with HTV-SIR material. Tracking and erosion performance of the compositions were evaluated by using standard inclined plane (IP) tracking and erosion tests, according to IEe 60587 standard. IP tests are performed at 3.5 kV power frequency (50 Hz) constant test voltages, for 0.3 ml/min contamination flow rate, at an ambient temperature of $pmb{23}pm pmb{2} {}^{circ}mathbf{C}$, and for six hours of test periods. Time-to-failures, eroded masses, and leakage currents of HTV-SIR filled with ATH and silica particles are investigated for different filler concentrations.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"406 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128188029","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046603
T. Sakoda, Mitsuki Kawakone, Noriyuki Hayshi, M. Setoguchi
For epoxy resin equipment, voids may exist owing to imperfection of insulation manufacturing. The electric field becomes high in the voids, and partial discharges (PDs) occur in such defects. Incidentally, the insulation material temperature varies with the status of load and the environmental condition. It is crucial to investigate PD activity at diffe re nt void te mpe rature and electric field. In this study, we carried out measurements of PDs in an artificial void of epoxy resin at various temperatures in the range of 30_50 degrees Celsius. The maximum electric fields in the void 1.5 mm in diameter were set at 4.6 kV/mm and 8.0 kV/mm. For a 4.6 kV/mm-void, the number of PDs was large at lower temperature at around 30 degrees Celsius. The number of PDs de cre ase d with the incre ase of the numbe r of te mpe rature-time cycles. The PD magnitude slightly incre ase d with the increase of temperature because the dielectric constant of epoxy resin might become high and the electric field in a void might become high. In contrast, the variation tendency of the number of PDs for an 8 kV/mm-void was much different from that for a 4.6 kV/mm-void. The number of PDs was large at around 50 degrees Celsius and in the middle of temperature rising from 40 to 50 degrees Celsius. Thus, we investigated that PD behavior during temperature-time cycles differs in electric field.
{"title":"Material Temperature Dependence on Behavior of Partial Discharge in Epoxy Resin","authors":"T. Sakoda, Mitsuki Kawakone, Noriyuki Hayshi, M. Setoguchi","doi":"10.1109/EIC43217.2019.9046603","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046603","url":null,"abstract":"For epoxy resin equipment, voids may exist owing to imperfection of insulation manufacturing. The electric field becomes high in the voids, and partial discharges (PDs) occur in such defects. Incidentally, the insulation material temperature varies with the status of load and the environmental condition. It is crucial to investigate PD activity at diffe re nt void te mpe rature and electric field. In this study, we carried out measurements of PDs in an artificial void of epoxy resin at various temperatures in the range of 30_50 degrees Celsius. The maximum electric fields in the void 1.5 mm in diameter were set at 4.6 kV/mm and 8.0 kV/mm. For a 4.6 kV/mm-void, the number of PDs was large at lower temperature at around 30 degrees Celsius. The number of PDs de cre ase d with the incre ase of the numbe r of te mpe rature-time cycles. The PD magnitude slightly incre ase d with the increase of temperature because the dielectric constant of epoxy resin might become high and the electric field in a void might become high. In contrast, the variation tendency of the number of PDs for an 8 kV/mm-void was much different from that for a 4.6 kV/mm-void. The number of PDs was large at around 50 degrees Celsius and in the middle of temperature rising from 40 to 50 degrees Celsius. Thus, we investigated that PD behavior during temperature-time cycles differs in electric field.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128934112","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046537
T. Nguyen
To process and test high voltage sample bars or full-sized coils of a generator or motor stator, requires an investment of time and expense. If there is a way to break the testing down into small parts using smaller specimens, time and expense could be saved. In this study, samples were prepared using 80% to 90% of epoxy, unsaturated polyester and polybutadiene-impregnating resins with 10% to 20% of various mica binder resins for the test. Multiple studies of these combinations of both resins would be conducted. With the studies of these properties, results should identify a potential screening procedure for the selection of resins prior to the impregnation of high voltage coils or test bars.
{"title":"Compatibility of Mica Binder Resins with Medium and High Voltage Impregnation Resins","authors":"T. Nguyen","doi":"10.1109/EIC43217.2019.9046537","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046537","url":null,"abstract":"To process and test high voltage sample bars or full-sized coils of a generator or motor stator, requires an investment of time and expense. If there is a way to break the testing down into small parts using smaller specimens, time and expense could be saved. In this study, samples were prepared using 80% to 90% of epoxy, unsaturated polyester and polybutadiene-impregnating resins with 10% to 20% of various mica binder resins for the test. Multiple studies of these combinations of both resins would be conducted. With the studies of these properties, results should identify a potential screening procedure for the selection of resins prior to the impregnation of high voltage coils or test bars.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129280527","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046550
J. Aizpurua, B. Stewart, S. Mcarthur, Nitin Jaiware, Martin Kearns
Power cables are critical assets for the safe and cost effective operation of the power grid. However, the health assessment of cables is intricate due to its various degradation mechanisms. Motivated by the generation of a consistent cable health index metric, this paper presents a novel hybrid cable health index approach which combines data-driven and physics-of-failure degradation models. Data-driven models are focused on partial discharge tests and physics-of-failure models are focused on cable lifetime estimation based on thermal and electrical stresses. The combination of these models offers an enhanced cable health indicator which supports engineers in the power cable maintenance related decision-making processes.
{"title":"Towards a Hybrid Power Cable Health Index for Medium Voltage Power Cable Condition Monitoring","authors":"J. Aizpurua, B. Stewart, S. Mcarthur, Nitin Jaiware, Martin Kearns","doi":"10.1109/EIC43217.2019.9046550","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046550","url":null,"abstract":"Power cables are critical assets for the safe and cost effective operation of the power grid. However, the health assessment of cables is intricate due to its various degradation mechanisms. Motivated by the generation of a consistent cable health index metric, this paper presents a novel hybrid cable health index approach which combines data-driven and physics-of-failure degradation models. Data-driven models are focused on partial discharge tests and physics-of-failure models are focused on cable lifetime estimation based on thermal and electrical stresses. The combination of these models offers an enhanced cable health indicator which supports engineers in the power cable maintenance related decision-making processes.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"305 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116749939","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}
As mechanical vibration usually exists in reactors, its influence on partial discharge (PD) needs to be studied so as to provide new clues for further understanding of the abnormal aging process of the insulation material as well as improve the reliability of on-line PD monitoring method. In this paper, PD characteristics of epoxy resin under different vibration conditions are investigated. Research shows that vibration could promote or suppress the occurrence and development of discharge by changing the state of field emission, the dissipation of charges and the conduction current, obvious variation was observed with the changing vibration amplitude. Moreover there are differences between the variation trend of the PD magnitude at different vibration frequency, which is due to the relative displacement of the electric field distribution and space charge, and the promotion or suppression of surface charge dissipation.
{"title":"Effect of Vibration on Surface Discharge of Epoxy Resin","authors":"Siyun Wang, M. Ren, Changjie Xia, Tianxin Zhuang, Shujing Yang, Xiaojing Dou","doi":"10.1109/EIC43217.2019.9046574","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046574","url":null,"abstract":"As mechanical vibration usually exists in reactors, its influence on partial discharge (PD) needs to be studied so as to provide new clues for further understanding of the abnormal aging process of the insulation material as well as improve the reliability of on-line PD monitoring method. In this paper, PD characteristics of epoxy resin under different vibration conditions are investigated. Research shows that vibration could promote or suppress the occurrence and development of discharge by changing the state of field emission, the dissipation of charges and the conduction current, obvious variation was observed with the changing vibration amplitude. Moreover there are differences between the variation trend of the PD magnitude at different vibration frequency, which is due to the relative displacement of the electric field distribution and space charge, and the promotion or suppression of surface charge dissipation.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115743324","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046546
D. Szabó, G. Göcsei, B. Németh, C. Richárd, L. Rácz
High voltage live-line maintenance (LLM) became a decisive working method in Hungary in the 1960s. Most of the LLM techniques and equipment - which are still in operation nowadays - were developed by Dr. Béla Csikós, who was one of the pioneers of high voltage live-line work. In those days the live maintainability of the power lines was a significant aspect during the design of towers and insulator strings. Contrarily, structures change year-by-year, especially regarding the insulators. Therefore, live working methods also shall be developed. Nowadays, new types of tower structures and insulator strings are used with reduced distances, which also means reduced clearance between the different potentials in the arrangement. During barehand live working method, the lineman has to keep the adequate distances from different potentials of power lines. Moreover, there is no uniform standard and international practice for the regulation of safety clearances. New type of mounting chair made of non-conductive material is suitable for approaching the insulator strings and their fittings safely, as the air gap between the conductive parts does not shorten. The aim of this paper is to investigate the usability of non-conductive mounting chair and the regulation of phase-to-ground clearances during insulator replacement technology, in case of several tower types and insulator types used in the Hungarian transmission grid. Another purpose of this article is to examine the possibility of reducing minimal approach distances, such as by the application of portable protective air gap (PPAG).
{"title":"Examination of clearances during high voltage live-line working","authors":"D. Szabó, G. Göcsei, B. Németh, C. Richárd, L. Rácz","doi":"10.1109/EIC43217.2019.9046546","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046546","url":null,"abstract":"High voltage live-line maintenance (LLM) became a decisive working method in Hungary in the 1960s. Most of the LLM techniques and equipment - which are still in operation nowadays - were developed by Dr. Béla Csikós, who was one of the pioneers of high voltage live-line work. In those days the live maintainability of the power lines was a significant aspect during the design of towers and insulator strings. Contrarily, structures change year-by-year, especially regarding the insulators. Therefore, live working methods also shall be developed. Nowadays, new types of tower structures and insulator strings are used with reduced distances, which also means reduced clearance between the different potentials in the arrangement. During barehand live working method, the lineman has to keep the adequate distances from different potentials of power lines. Moreover, there is no uniform standard and international practice for the regulation of safety clearances. New type of mounting chair made of non-conductive material is suitable for approaching the insulator strings and their fittings safely, as the air gap between the conductive parts does not shorten. The aim of this paper is to investigate the usability of non-conductive mounting chair and the regulation of phase-to-ground clearances during insulator replacement technology, in case of several tower types and insulator types used in the Hungarian transmission grid. Another purpose of this article is to examine the possibility of reducing minimal approach distances, such as by the application of portable protective air gap (PPAG).","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115908450","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：