Pub Date : 2002-04-07DOI: 10.1109/ELINSL.2002.995975
G. Montanari, Davide Fabiani, M. Melloni, F. Palmieri
The results of space charge measurements carried out on specimens cut from high-voltage XLPE cables are discussed in this paper. The specimens were aged in the laboratory under electrical, thermal and thermoelectrical stresses, for various times, with the purpose of searching for diagnostic indicators derived from space charge data. It is shown that two quantities extracted from space charge measurements, that is, the threshold for space charge accumulation and the apparent, trap-controlled, mobility display a good correlation with aging time and stress, thus providing interesting markers for aging diagnosis and life estimation. Aging models are proposed correlating markers with aging time.
{"title":"Diagnostic markers for AC power cable insulation aging based on space charge measurements","authors":"G. Montanari, Davide Fabiani, M. Melloni, F. Palmieri","doi":"10.1109/ELINSL.2002.995975","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995975","url":null,"abstract":"The results of space charge measurements carried out on specimens cut from high-voltage XLPE cables are discussed in this paper. The specimens were aged in the laboratory under electrical, thermal and thermoelectrical stresses, for various times, with the purpose of searching for diagnostic indicators derived from space charge data. It is shown that two quantities extracted from space charge measurements, that is, the threshold for space charge accumulation and the apparent, trap-controlled, mobility display a good correlation with aging time and stress, thus providing interesting markers for aging diagnosis and life estimation. Aging models are proposed correlating markers with aging time.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"44 1","pages":"464-467"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73787885","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995880
V. R. Garcia-Colon
In this paper a multi point partial discharge (PD) measurement approach is presented and named as distributed PD measurement (D-PDM). These D-PDM technique records PD pulses using an ultra wide band system that allow spatial discrimination due to high frequency signals rapid decay while displaying the output in a traditional Q-F-N pattern to facilitate problem identification. D-PDM was applied to evaluate an underground radial and meshed distribution networks with over 70 three phase PILC circuits while in normal operation. Several incipient fault sites were located and a predictive maintenance program established using this technique.
{"title":"Distributed PD measurement on power underground cables","authors":"V. R. Garcia-Colon","doi":"10.1109/ELINSL.2002.995880","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995880","url":null,"abstract":"In this paper a multi point partial discharge (PD) measurement approach is presented and named as distributed PD measurement (D-PDM). These D-PDM technique records PD pulses using an ultra wide band system that allow spatial discrimination due to high frequency signals rapid decay while displaying the output in a traditional Q-F-N pattern to facilitate problem identification. D-PDM was applied to evaluate an underground radial and meshed distribution networks with over 70 three phase PILC circuits while in normal operation. Several incipient fault sites were located and a predictive maintenance program established using this technique.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"5 1","pages":"57-61"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82125448","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995892
S. Hvidsten, J. T. Benjaminsen
In this paper, results from diagnostic measurements performed on service aged 12 and 24 kV (MV) XLPE cables equipped with strippable insulation screens are reported. The main purpose of this work has been to examine if condition assessment can be performed on such cables having typically low density of vented water trees. The actual condition of the cables was determined by laboratory AC breakdown tests and water tree examinations performed on the same cables. Secondly, the influence on the diagnostic testing of the joints installed on the cables has been examined. The results show that it is not possible to distinguish the ageing status for cables having breakdown voltages of 5 U. and higher. The evaluation criteria need to be further developed, in order to examine if the condition of cables with breakdown voltages lower than 5 U. can be reliably assessed. Joints with resistive field grading can have very high resistive losses preventing a reliable condition assessment of the cable insulation.
{"title":"Diagnostic testing of MV XLPE cables with low density of water trees","authors":"S. Hvidsten, J. T. Benjaminsen","doi":"10.1109/ELINSL.2002.995892","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995892","url":null,"abstract":"In this paper, results from diagnostic measurements performed on service aged 12 and 24 kV (MV) XLPE cables equipped with strippable insulation screens are reported. The main purpose of this work has been to examine if condition assessment can be performed on such cables having typically low density of vented water trees. The actual condition of the cables was determined by laboratory AC breakdown tests and water tree examinations performed on the same cables. Secondly, the influence on the diagnostic testing of the joints installed on the cables has been examined. The results show that it is not possible to distinguish the ageing status for cables having breakdown voltages of 5 U. and higher. The evaluation criteria need to be further developed, in order to examine if the condition of cables with breakdown voltages lower than 5 U. can be reliably assessed. Joints with resistive field grading can have very high resistive losses preventing a reliable condition assessment of the cable insulation.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"31 1","pages":"108-111"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90109133","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995944
S. Keim, D. Koenig, M. Eiselt, M. Kluge
In this paper ageing tests focussed on indoor switchgear respective on their core components are described. These tests aim at simulating severe environmental stresses and are recommended to be performed for switchgear which has to operate in a harsh indoor climate. Standardized and nonstandardized test procedures are compared on the basis of experimental experience. IEC Report 932 deals with requirements for enclosed switchgear and control gear from 1 kV to 72.5 kV, to be used in severe climatic indoor conditions and considers the environmental stress factor condensation and pollution. Different test procedures proposed in EEC Report 932 will be illustrated and relevant tests are performed on newly developed medium voltage switchgear NXAir P in the High Voltage Laboratories at Darmstadt University of Technology in cooperation with Siemens AG, Power Transmission and Distribution, Frankfurt. The objective or the presented paper is to evaluate the performance of the insulating components under harsh operating conditions by performing an ageing test.
{"title":"Standardized and nonstandardized ageing tests for indoor switchgear and switchgear components under severe climatic conditions","authors":"S. Keim, D. Koenig, M. Eiselt, M. Kluge","doi":"10.1109/ELINSL.2002.995944","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995944","url":null,"abstract":"In this paper ageing tests focussed on indoor switchgear respective on their core components are described. These tests aim at simulating severe environmental stresses and are recommended to be performed for switchgear which has to operate in a harsh indoor climate. Standardized and nonstandardized test procedures are compared on the basis of experimental experience. IEC Report 932 deals with requirements for enclosed switchgear and control gear from 1 kV to 72.5 kV, to be used in severe climatic indoor conditions and considers the environmental stress factor condensation and pollution. Different test procedures proposed in EEC Report 932 will be illustrated and relevant tests are performed on newly developed medium voltage switchgear NXAir P in the High Voltage Laboratories at Darmstadt University of Technology in cooperation with Siemens AG, Power Transmission and Distribution, Frankfurt. The objective or the presented paper is to evaluate the performance of the insulating components under harsh operating conditions by performing an ageing test.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"1 1","pages":"331-335"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76481441","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.996001
H. Zhu, V. Green, D. Huynh
Rotating machine failures due to insulation breakdown can cause catastrophic damages to the equipment, loss or de-rating of power output, lengthy forced outages and heavy costs to the utility. Therefore it is desirable to detect the onset of significant insulation deterioration and identify potential failures as early as possible. As in the medical field, regular testing and early detection of problems mean better chances of survival for the 'patient'. Faced with increasing pressure to increase unit availability yet reduce maintenance costs, utilities are moving away from time-based maintenance practices to condition-based maintenance efforts. Owners of generators and large motors are using on-line partial discharge analysis (PDA) systems for condition monitoring of the stator insulation system. Regular condition monitoring of the stator winding insulation can give users the confidence to safely operate machines, even ones that have suffered some degree of insulation degradation. This paper presents two case studies of how utilities applied an online PD testing system on a generator and a motor with insulation degradation to avoid substantial costs and forced outages. Long-term online PD monitoring has given the utilities confidence to continue running machines that have the potential for insulation failures.
{"title":"Lifetime extension experience on rotating machine insulation using on-line PD testing","authors":"H. Zhu, V. Green, D. Huynh","doi":"10.1109/ELINSL.2002.996001","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.996001","url":null,"abstract":"Rotating machine failures due to insulation breakdown can cause catastrophic damages to the equipment, loss or de-rating of power output, lengthy forced outages and heavy costs to the utility. Therefore it is desirable to detect the onset of significant insulation deterioration and identify potential failures as early as possible. As in the medical field, regular testing and early detection of problems mean better chances of survival for the 'patient'. Faced with increasing pressure to increase unit availability yet reduce maintenance costs, utilities are moving away from time-based maintenance practices to condition-based maintenance efforts. Owners of generators and large motors are using on-line partial discharge analysis (PDA) systems for condition monitoring of the stator insulation system. Regular condition monitoring of the stator winding insulation can give users the confidence to safely operate machines, even ones that have suffered some degree of insulation degradation. This paper presents two case studies of how utilities applied an online PD testing system on a generator and a motor with insulation degradation to avoid substantial costs and forced outages. Long-term online PD monitoring has given the utilities confidence to continue running machines that have the potential for insulation failures.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"7 1","pages":"561-564"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74024496","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995963
C. Bak, B. Bak‐Jensen, J. T. Sørensen
Most hardware for use in HV systems requires a thorough geometric design concerning the inception of breakdown (partial discharges, corona). Work shows an interest in such corona onset design optimization criteria. Corona onset optimization is based on numerical E-field calculations and different methods for determination of onset/no onset. Practical HV equipment conductor surfaces will normally form nonuniform E-fields possessing a breakdown behaviour determined by both the surface electric field and the rate of decay of the field. Besides that, among other issues, one has to take into account the type of gas, the temperature and the pressure. Therefore it seems important to apply an accurate onset criteria in corona onset design. This work presents the first step of a validated onset criteria useful for practical electrode geometries. This is accomplished for atmospheric air on the basis of the well-known Townsend approach for nonuniform fields with modifications concerning the gas parameters and validation against IEC 52 sphere-sphere gap breakdown voltages. It was found that the onset/breakdown voltage for medium nonuniform fields can be calculated by means of the same criteria for varying electrode curvatures and degrees of field utilization with an accuracy better than 4%.
{"title":"An improved model for the calculation of the electrical onset in gas insulated medium inhomogeneous gaps","authors":"C. Bak, B. Bak‐Jensen, J. T. Sørensen","doi":"10.1109/ELINSL.2002.995963","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995963","url":null,"abstract":"Most hardware for use in HV systems requires a thorough geometric design concerning the inception of breakdown (partial discharges, corona). Work shows an interest in such corona onset design optimization criteria. Corona onset optimization is based on numerical E-field calculations and different methods for determination of onset/no onset. Practical HV equipment conductor surfaces will normally form nonuniform E-fields possessing a breakdown behaviour determined by both the surface electric field and the rate of decay of the field. Besides that, among other issues, one has to take into account the type of gas, the temperature and the pressure. Therefore it seems important to apply an accurate onset criteria in corona onset design. This work presents the first step of a validated onset criteria useful for practical electrode geometries. This is accomplished for atmospheric air on the basis of the well-known Townsend approach for nonuniform fields with modifications concerning the gas parameters and validation against IEC 52 sphere-sphere gap breakdown voltages. It was found that the onset/breakdown voltage for medium nonuniform fields can be calculated by means of the same criteria for varying electrode curvatures and degrees of field utilization with an accuracy better than 4%.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"25 1","pages":"411-416"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74220990","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995995
S. Brettschneider, E. Lemke, J. L. Hinkle, M. Schneider
The paper reports on service field experiences with PD diagnostics on distribution cables using damped oscillating voltage waveforms: This test method was introduced some years ago in particular for on-site tests. Standard test procedures using continuous AC voltages are very cost intensive due to the high capacitive power demand of the cables and the resulting large sizes of the test sets, whereas other alternative methods do not reproduce similar PD than under service conditions. Experiences from the service field reveal that the oscillating voltage waveforms (OVW) method shows a very high sensitivity of PD detection and recognition of electrical treeing. Examples for critical assessment values have been determined for cross linked polyethylene (XLPE) cables as well as for oil-paper (PILC) cables allowing the network operator to decide which maintenance operation has to be performed on the distribution cable.
{"title":"Recent field experience in PD assessment of power cables using oscillating voltage waveforms","authors":"S. Brettschneider, E. Lemke, J. L. Hinkle, M. Schneider","doi":"10.1109/ELINSL.2002.995995","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995995","url":null,"abstract":"The paper reports on service field experiences with PD diagnostics on distribution cables using damped oscillating voltage waveforms: This test method was introduced some years ago in particular for on-site tests. Standard test procedures using continuous AC voltages are very cost intensive due to the high capacitive power demand of the cables and the resulting large sizes of the test sets, whereas other alternative methods do not reproduce similar PD than under service conditions. Experiences from the service field reveal that the oscillating voltage waveforms (OVW) method shows a very high sensitivity of PD detection and recognition of electrical treeing. Examples for critical assessment values have been determined for cross linked polyethylene (XLPE) cables as well as for oil-paper (PILC) cables allowing the network operator to decide which maintenance operation has to be performed on the distribution cable.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"86 1","pages":"546-552"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77682886","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995973
W. Song, D.I. Yang, Y.H. Chung, D.S. Kim, H. S. Koh
This study aims to analyze the performance of the SF/sub 6//N/sub 2/ mixtures that can be a substitute for SF/sub 6/ in gas circuit breaker (GCB). The interrupting capability of SF/sub 6//N/sub 2/ mixtures were verified in real GCB with N/sub 2/ percentage varying from 0 to 50%. We carried out the current interrupting tests of SF/sub 6//N/sub 2/ mixtures by using a 170 kV puffer-type GCB at a laboratory. The results obtained from this study show that a 25% of N/sub 2/ mixture has an equivalent current-interrupting capability to pure SF/sub 6/ and a 50% of N/sub 2/ mixture has lesser capabilities. We will test a 75% of N/sub 2/ mixture soon and by using the test results, we develop a new-type interrupter of gas mixture.
{"title":"A study of large current interrupting capability of SF/sub 6//N/sub 2/ mixtures","authors":"W. Song, D.I. Yang, Y.H. Chung, D.S. Kim, H. S. Koh","doi":"10.1109/ELINSL.2002.995973","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995973","url":null,"abstract":"This study aims to analyze the performance of the SF/sub 6//N/sub 2/ mixtures that can be a substitute for SF/sub 6/ in gas circuit breaker (GCB). The interrupting capability of SF/sub 6//N/sub 2/ mixtures were verified in real GCB with N/sub 2/ percentage varying from 0 to 50%. We carried out the current interrupting tests of SF/sub 6//N/sub 2/ mixtures by using a 170 kV puffer-type GCB at a laboratory. The results obtained from this study show that a 25% of N/sub 2/ mixture has an equivalent current-interrupting capability to pure SF/sub 6/ and a 50% of N/sub 2/ mixture has lesser capabilities. We will test a 75% of N/sub 2/ mixture soon and by using the test results, we develop a new-type interrupter of gas mixture.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"11 1","pages":"457-459"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78074673","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995957
R. Kotte, E. Gockenbach, H. Borsi
Experimental investigations concerning the influence of the cure parameters on the partial discharge inception voltage (PDIV) of four heat-resistant cast resin systems are presented and discussed in this paper. The tests were performed on two epoxy resin systems in combination with silica flour and wollastonite, respectively, with different post-cure parameters. The PDIV was measured in a nonuniform electrical field in dependence on the temperature. The contribution reveals that a raise of the cure temperature can lead to a significant decline of the PDIV.
{"title":"Influence of the cure parameters on the partial discharge behavior of cast resins","authors":"R. Kotte, E. Gockenbach, H. Borsi","doi":"10.1109/ELINSL.2002.995957","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995957","url":null,"abstract":"Experimental investigations concerning the influence of the cure parameters on the partial discharge inception voltage (PDIV) of four heat-resistant cast resin systems are presented and discussed in this paper. The tests were performed on two epoxy resin systems in combination with silica flour and wollastonite, respectively, with different post-cure parameters. The PDIV was measured in a nonuniform electrical field in dependence on the temperature. The contribution reveals that a raise of the cure temperature can lead to a significant decline of the PDIV.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"1 1","pages":"387-390"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89495859","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 : 2002-04-07DOI: 10.1109/ELINSL.2002.995922
B. Zegnini, D. Mahi
The concept of the estimated intensity of the electrical current flowing in the electrolyte enables one to check the advancement of the leader of the discharge according to time. We observed the extension of a discharge on an electrolyte surface by using an original set-up permitting simultaneous measurements of optical and electrical parameters on the same flashover in different points of the discharge path. The resistance per unit length of the conductive film was varied in the range 2 k/spl Omega//cm to 10 k/spl Omega//cm. Experimental results suggest that on the first half of the course that the discharge nearly propagates with a constant instantaneous velocity. It then accelerates its progression on the second half with discontinuities capable to be assigned to progressions by jumps characterizing a change of mechanism of propagating discharge. Our results have been validated by comparison with those published in the literature, which they confirm and often refine. The results bring to the fore the presence, ahead of the principal discharge, of a photoionization zone in which the development can occur of the streamers serving as precursors to its extension.
{"title":"The relationship between the estimated intensity of electrical current flowing in the electrolyte and the propagation of the local discharge on an electrolytic surface under AC voltage","authors":"B. Zegnini, D. Mahi","doi":"10.1109/ELINSL.2002.995922","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995922","url":null,"abstract":"The concept of the estimated intensity of the electrical current flowing in the electrolyte enables one to check the advancement of the leader of the discharge according to time. We observed the extension of a discharge on an electrolyte surface by using an original set-up permitting simultaneous measurements of optical and electrical parameters on the same flashover in different points of the discharge path. The resistance per unit length of the conductive film was varied in the range 2 k/spl Omega//cm to 10 k/spl Omega//cm. Experimental results suggest that on the first half of the course that the discharge nearly propagates with a constant instantaneous velocity. It then accelerates its progression on the second half with discontinuities capable to be assigned to progressions by jumps characterizing a change of mechanism of propagating discharge. Our results have been validated by comparison with those published in the literature, which they confirm and often refine. The results bring to the fore the presence, ahead of the principal discharge, of a photoionization zone in which the development can occur of the streamers serving as precursors to its extension.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"2 1","pages":"241-244"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88032415","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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