Pub Date : 2006-10-01DOI: 10.1109/CEIDP.2006.312054
Navneet Kishore, G. S. Punekar, H. Shastry
The horizontal sphere gap is modeled using six point charges per electrode as a test case. Two intuitively felt optimized charge simulation method (OCSM) models of horizontal sphere gap arrangement are set up by selectively changing degree of freedom to understand its effect on the simulation errors. The optimal location of charges is obtained using genetic algorithm (GA). A large number of numerical experiments are conducted by varying potential assigned to the low potential sphere, height of the spheres above the ground plane and gap separation. Lower potential sphere always shows higher error. For a typical case, the maximum surface potential error with increased freedom in locating charges reduced to 4% from its earlier value of 9.5%. The simulations with symmetrical supply show maximum surface potential error of 1.0% on both the spheres. On the other hand simulating a ground potential electrode near a high voltage electrode involves more errors and hence more effort. The charge simulation method being semi analytical technique, the shape of the geometry and symmetry (if any) plays a major role and setting up accurate OCSM model still requires user experience.
{"title":"Optimized Charge Simulation Models of Horizontal Sphere Gaps","authors":"Navneet Kishore, G. S. Punekar, H. Shastry","doi":"10.1109/CEIDP.2006.312054","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312054","url":null,"abstract":"The horizontal sphere gap is modeled using six point charges per electrode as a test case. Two intuitively felt optimized charge simulation method (OCSM) models of horizontal sphere gap arrangement are set up by selectively changing degree of freedom to understand its effect on the simulation errors. The optimal location of charges is obtained using genetic algorithm (GA). A large number of numerical experiments are conducted by varying potential assigned to the low potential sphere, height of the spheres above the ground plane and gap separation. Lower potential sphere always shows higher error. For a typical case, the maximum surface potential error with increased freedom in locating charges reduced to 4% from its earlier value of 9.5%. The simulations with symmetrical supply show maximum surface potential error of 1.0% on both the spheres. On the other hand simulating a ground potential electrode near a high voltage electrode involves more errors and hence more effort. The charge simulation method being semi analytical technique, the shape of the geometry and symmetry (if any) plays a major role and setting up accurate OCSM model still requires user experience.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127830123","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312018
R. Patsch, J. Menzel, D. Benzerouk
Partial discharges in oil are influenced by the actual dielectric properties of the liquid. Especially degradation products or water may influence the electric strength, the local field distribution in the surrounding of defects and hence the ignition and the sequence of partial discharges. As a consequence of dielectric forces the local concentration of polar molecules in non homogeneous electric fields is influenced and especially at spots of extreme high electric fields (at which usually partial discharges start) a local accumulation may occur and influence the partial discharge phenomena. The analysis of the sequences of partial discharges (Patsch and Berton, 2002) as well as the pulse shapes of the signals (Patsch et al., 2002) from the coupling device in differently aged and/or polluted oil shows characteristic differences. Possibilities to use characteristic parameters for diagnostic purposes and especially their correlation to other dielectric properties will be discussed in detail.
{"title":"The Use of the Pulse Sequence Analysis to Monitor the Condition of Oil","authors":"R. Patsch, J. Menzel, D. Benzerouk","doi":"10.1109/CEIDP.2006.312018","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312018","url":null,"abstract":"Partial discharges in oil are influenced by the actual dielectric properties of the liquid. Especially degradation products or water may influence the electric strength, the local field distribution in the surrounding of defects and hence the ignition and the sequence of partial discharges. As a consequence of dielectric forces the local concentration of polar molecules in non homogeneous electric fields is influenced and especially at spots of extreme high electric fields (at which usually partial discharges start) a local accumulation may occur and influence the partial discharge phenomena. The analysis of the sequences of partial discharges (Patsch and Berton, 2002) as well as the pulse shapes of the signals (Patsch et al., 2002) from the coupling device in differently aged and/or polluted oil shows characteristic differences. Possibilities to use characteristic parameters for diagnostic purposes and especially their correlation to other dielectric properties will be discussed in detail.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125821816","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312000
V. Mentlík, J. Pihera, P. Trnka, P. Martínek
During the last few decades, partial discharge measurement and analysis have been considered one of the most important test methods for evaluating the quality of electrical machines and insulating systems. Test methods based on potential free capacitive and/or inductive couplers have taken place as well as methods based on the galvanic circuit with measuring impedance. These potential free couplers detect the electromagnetic field that is generated by partial discharge activity. The partial discharge detection, with using of the capacitive coupler, was the main reason to perform the measurements. The conclusions of the test are presented in this paper. Furthermore, the analysis of partial discharge of several physical models was performed because of the coupler's calibration and sensitivity evaluation. The different methods and apparatuses were used for partial discharge detection with the aim of the accuracy and sensitivity of the potential free method determination. The diagnostic equipment consists of a wideband analog apparatus, a digital apparatus, couplers and measuring impedance. The measurement was done according to IEC 270 standard. The capacitive couplers have been used as well for performing the potential free test method measurement.
{"title":"Partial Discharge Potential Free Test Methods","authors":"V. Mentlík, J. Pihera, P. Trnka, P. Martínek","doi":"10.1109/CEIDP.2006.312000","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312000","url":null,"abstract":"During the last few decades, partial discharge measurement and analysis have been considered one of the most important test methods for evaluating the quality of electrical machines and insulating systems. Test methods based on potential free capacitive and/or inductive couplers have taken place as well as methods based on the galvanic circuit with measuring impedance. These potential free couplers detect the electromagnetic field that is generated by partial discharge activity. The partial discharge detection, with using of the capacitive coupler, was the main reason to perform the measurements. The conclusions of the test are presented in this paper. Furthermore, the analysis of partial discharge of several physical models was performed because of the coupler's calibration and sensitivity evaluation. The different methods and apparatuses were used for partial discharge detection with the aim of the accuracy and sensitivity of the potential free method determination. The diagnostic equipment consists of a wideband analog apparatus, a digital apparatus, couplers and measuring impedance. The measurement was done according to IEC 270 standard. The capacitive couplers have been used as well for performing the potential free test method measurement.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115279000","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312005
P. Kundu, N. Kishore, A. Sinha
Acoustic detection of partial discharges is based on the retrieval and analysis of mechanical signals produced by partial discharges. Acoustic method is widely used in locating partial discharge sources in transformers. For source location constant velocity of acoustic signals is used. Acoustic method also has potential to classify the partial discharges for better assessment of insulation condition. This paper presents a computer simulation of acoustic signal and analysis of its propagation behavior. It is found that acoustic velocity is not constant over distances of practical interest. An algorithm proposed for source location with distance dependent acoustic velocity leads to reduction in location error. Acoustic pulse produced by partial discharges is deformed and attenuated while propagating through transformer to sensor. This change depends on propagation distance and medium. So, frequency spectrum of sensor output AE pulse is not true representation of source pulse frequency spectrum. Partial discharge classification based on the output acoustic signal can lead to wrong classification. Knowing the location of partial discharge source, frequency dependent attenuation characteristics and output acoustic signal's frequency spectrum, an estimation of input pulse frequency spectrum and its parameters is made for the classification of partial discharges
{"title":"Simulation and Analysis of Acoustic Wave Propagation due to Partial Discharge Activity","authors":"P. Kundu, N. Kishore, A. Sinha","doi":"10.1109/CEIDP.2006.312005","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312005","url":null,"abstract":"Acoustic detection of partial discharges is based on the retrieval and analysis of mechanical signals produced by partial discharges. Acoustic method is widely used in locating partial discharge sources in transformers. For source location constant velocity of acoustic signals is used. Acoustic method also has potential to classify the partial discharges for better assessment of insulation condition. This paper presents a computer simulation of acoustic signal and analysis of its propagation behavior. It is found that acoustic velocity is not constant over distances of practical interest. An algorithm proposed for source location with distance dependent acoustic velocity leads to reduction in location error. Acoustic pulse produced by partial discharges is deformed and attenuated while propagating through transformer to sensor. This change depends on propagation distance and medium. So, frequency spectrum of sensor output AE pulse is not true representation of source pulse frequency spectrum. Partial discharge classification based on the output acoustic signal can lead to wrong classification. Knowing the location of partial discharge source, frequency dependent attenuation characteristics and output acoustic signal's frequency spectrum, an estimation of input pulse frequency spectrum and its parameters is made for the classification of partial discharges","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115419750","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311961
Lei Hou, Liming Wang, Z. Guan
Dynamics characteristic of composite insulators under horizontal load caused by wind load is studied in this paper. For the advantages, V-string insulators are widely used in overhead transmission lines. Earlier study proves that the buckling deformation of the composite insulator under compression load is stable. So it is reasonable to allow composite insulators bearing compression force. The new concept makes it possible to adopt smaller V-string included angle and reduce the costs of the overhead transmission line. The static loading characteristics of V-string at different included angle under different vertical and horizontal load have been determined in the V-string static load experiments. The possibility of adopting small included angle is verified. Because of the differences between dynamic wind load and static load, in certain circumstances, the dynamic effects need to be examined. Dynamics response of insulator-conductor system is analyzed in the paper. The mathematical model of the insulator-conductor system is presented. Finally, according to the experiment and simulation results and the theoretical analysis, the complete optimized designing solution of V-string composite insulators for 330 kV overhead transmission line is determined.
{"title":"Dynamics characteristic of V-string composite insulators for 330kV overhead transmission line","authors":"Lei Hou, Liming Wang, Z. Guan","doi":"10.1109/CEIDP.2006.311961","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311961","url":null,"abstract":"Dynamics characteristic of composite insulators under horizontal load caused by wind load is studied in this paper. For the advantages, V-string insulators are widely used in overhead transmission lines. Earlier study proves that the buckling deformation of the composite insulator under compression load is stable. So it is reasonable to allow composite insulators bearing compression force. The new concept makes it possible to adopt smaller V-string included angle and reduce the costs of the overhead transmission line. The static loading characteristics of V-string at different included angle under different vertical and horizontal load have been determined in the V-string static load experiments. The possibility of adopting small included angle is verified. Because of the differences between dynamic wind load and static load, in certain circumstances, the dynamic effects need to be examined. Dynamics response of insulator-conductor system is analyzed in the paper. The mathematical model of the insulator-conductor system is presented. Finally, according to the experiment and simulation results and the theoretical analysis, the complete optimized designing solution of V-string composite insulators for 330 kV overhead transmission line is determined.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116379557","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312077
D. Tashima, K. Kurosawatsu, M. Otsubo, C. Honda
The space charge distribution in electric double layer capacitor (EDLC) for energy storage has been examined by pulsed electro-acoustic (PEA) method since 2002. It is found that the measuremental result can be influenced by the reflection and penetration of the sound wave when the space charge distribution of EDLC is measured by PEA method, because the EDLC has a five layer structure consisting of three materials (aluminum, cellulose, and activated carbon). Then, we calculated reflection wave components that influence on charge density from the acoustic impedance and relative permittivity of the materials. As a result, it has been understood that the changes in the space charge distribution of EDLC and the charge characteristic of the EDLC are almost corresponding. The use of the PEA method can be expected as a method of evaluating the accumulation charge of EDLC by measuring the space charge distribution of it. In this paper, a polarized electrode is made to develop EDLC and a ratio of surface area and average pore diameter of polarized electrode is measured by nitrogen adsorption method at 77K. Also, relation between a ratio of surface area and average pore diameter and space charge distributions of EDLC are discussed.
{"title":"Relation between Space Charge and Pore Size of Nano Porous Electrode for Super Capacitor","authors":"D. Tashima, K. Kurosawatsu, M. Otsubo, C. Honda","doi":"10.1109/CEIDP.2006.312077","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312077","url":null,"abstract":"The space charge distribution in electric double layer capacitor (EDLC) for energy storage has been examined by pulsed electro-acoustic (PEA) method since 2002. It is found that the measuremental result can be influenced by the reflection and penetration of the sound wave when the space charge distribution of EDLC is measured by PEA method, because the EDLC has a five layer structure consisting of three materials (aluminum, cellulose, and activated carbon). Then, we calculated reflection wave components that influence on charge density from the acoustic impedance and relative permittivity of the materials. As a result, it has been understood that the changes in the space charge distribution of EDLC and the charge characteristic of the EDLC are almost corresponding. The use of the PEA method can be expected as a method of evaluating the accumulation charge of EDLC by measuring the space charge distribution of it. In this paper, a polarized electrode is made to develop EDLC and a ratio of surface area and average pore diameter of polarized electrode is measured by nitrogen adsorption method at 77K. Also, relation between a ratio of surface area and average pore diameter and space charge distributions of EDLC are discussed.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129567751","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311936
F. Guastavino, A. Ratto, E. Torello, M. Hoyos, N. García, H. Reinecke, E. Benito, P. Tiemblo
An AC electrical strength test campaign was performed on different Low Density Polyethylene (LDPE) nanocomposites. Such materials were obtained by the dispersion of inorganic nanoparticles having different aspect ratio and surface nature: silica AEROSIL 200 and montmorillonite. All the considered nanofillers have been organically modified in order to obtain a good dispersion and an efficient interfacial interaction.. The investigated nanocomposite materials show a higher electrical strength than the pure LDPE.
{"title":"AC electrical strength measurements on LDPE nanocomposites","authors":"F. Guastavino, A. Ratto, E. Torello, M. Hoyos, N. García, H. Reinecke, E. Benito, P. Tiemblo","doi":"10.1109/CEIDP.2006.311936","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311936","url":null,"abstract":"An AC electrical strength test campaign was performed on different Low Density Polyethylene (LDPE) nanocomposites. Such materials were obtained by the dispersion of inorganic nanoparticles having different aspect ratio and surface nature: silica AEROSIL 200 and montmorillonite. All the considered nanofillers have been organically modified in order to obtain a good dispersion and an efficient interfacial interaction.. The investigated nanocomposite materials show a higher electrical strength than the pure LDPE.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129809242","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.311979
R. Gorur, N. Chawla, J. Hunt, M. Dyer
This paper presents an overview of important aspects regarding the use of overhead conductors employing composite materials. These issues must be addressed for them to be accepted as viable replacement of traditional overhead conductors employing a steel core. It also elucidates the lessons learned from the use of composite insulators that can be applied to composite conductors. Preliminary experimental and theoretical results performed on two types of composite cores technologies presently available are presented.
{"title":"Mechanical and electrical issues concerning the use of composite materials for the supporting core in transmission line conductors","authors":"R. Gorur, N. Chawla, J. Hunt, M. Dyer","doi":"10.1109/CEIDP.2006.311979","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.311979","url":null,"abstract":"This paper presents an overview of important aspects regarding the use of overhead conductors employing composite materials. These issues must be addressed for them to be accepted as viable replacement of traditional overhead conductors employing a steel core. It also elucidates the lessons learned from the use of composite insulators that can be applied to composite conductors. Preliminary experimental and theoretical results performed on two types of composite cores technologies presently available are presented.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128856693","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312002
K. Inuzuka, H. Inano, N. Hayakawa, T. Hirose, M. Hamaguchi, H. Okubo
Recently, partial discharge (PD)-resistant enameled wires mixed with inorganic particles of nanometer order, referred to as the nanocomposite enameled wires, have been developed and verified to have longer life compared with conventional enameled wires. We investigated the fundamental characteristics on PD inception, propagation and breakdown (BD) of nanocomposite enameled wire under surge voltage conditions. Electrical and optical PD measurements were carried out for twisted pair samples with nanocomposite and conventional enameled wires. Experimental results revealed that there was no difference in PD inception voltage (PDIV) between both wires. The relationship between applied voltage and time to BD (V-t characteristics) exhibited the longer life of nanocomposite enameled wires, e.g. 2-20 times of conventional enameled wires, which was highly influenced by the applied voltage level and the repetition rate.
{"title":"Partial Discharge Characteristics of Nanocomposite Enameled Wire for Inverter-Fed Motor","authors":"K. Inuzuka, H. Inano, N. Hayakawa, T. Hirose, M. Hamaguchi, H. Okubo","doi":"10.1109/CEIDP.2006.312002","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312002","url":null,"abstract":"Recently, partial discharge (PD)-resistant enameled wires mixed with inorganic particles of nanometer order, referred to as the nanocomposite enameled wires, have been developed and verified to have longer life compared with conventional enameled wires. We investigated the fundamental characteristics on PD inception, propagation and breakdown (BD) of nanocomposite enameled wire under surge voltage conditions. Electrical and optical PD measurements were carried out for twisted pair samples with nanocomposite and conventional enameled wires. Experimental results revealed that there was no difference in PD inception voltage (PDIV) between both wires. The relationship between applied voltage and time to BD (V-t characteristics) exhibited the longer life of nanocomposite enameled wires, e.g. 2-20 times of conventional enameled wires, which was highly influenced by the applied voltage level and the repetition rate.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125541617","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 : 2006-10-01DOI: 10.1109/CEIDP.2006.312046
Minkyu Kim, R. Hebner, G. Hallock
Work by Fowler, Daveny, and Hagedom showed that the morphology of an anode streamer could be modeled as stochastic growth of a branching fractal tree in point-plane geometry. In their work, the experimentally observed range of fractal densities, from sparse to bushy, was modeled by using two assumptions. One was that the growth was driven by En, where E is the local electric field and n is 1, 2, 3, or 4. The other assumption is that there was a threshold (cutoff) electric field strength for streamer growth in a particular direction. This investigation first reproduced the results of the earlier study to demonstrate that the model and its software implementation yielded the previous results. The model was then modified to operate under a different set of assumptions. In this case, only linear electric field dependence was assumed, and the number density of available electrons was used as a parameter to match the observed data. In addition, rather than assume a sharp cutoff of the threshold field strength, the cutoff was assumed to be a function of electron density. Under these assumptions, it was also possible to simulate the experimentally observed behavior of anode streamers. The current assumptions are consistent with those that have proven to be useful in an earlier investigation.
{"title":"Examination of the influence of streamer growth criteria on morphology","authors":"Minkyu Kim, R. Hebner, G. Hallock","doi":"10.1109/CEIDP.2006.312046","DOIUrl":"https://doi.org/10.1109/CEIDP.2006.312046","url":null,"abstract":"Work by Fowler, Daveny, and Hagedom showed that the morphology of an anode streamer could be modeled as stochastic growth of a branching fractal tree in point-plane geometry. In their work, the experimentally observed range of fractal densities, from sparse to bushy, was modeled by using two assumptions. One was that the growth was driven by En, where E is the local electric field and n is 1, 2, 3, or 4. The other assumption is that there was a threshold (cutoff) electric field strength for streamer growth in a particular direction. This investigation first reproduced the results of the earlier study to demonstrate that the model and its software implementation yielded the previous results. The model was then modified to operate under a different set of assumptions. In this case, only linear electric field dependence was assumed, and the number density of available electrons was used as a parameter to match the observed data. In addition, rather than assume a sharp cutoff of the threshold field strength, the cutoff was assumed to be a function of electron density. Under these assumptions, it was also possible to simulate the experimentally observed behavior of anode streamers. The current assumptions are consistent with those that have proven to be useful in an earlier investigation.","PeriodicalId":219099,"journal":{"name":"2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122064910","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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