Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.414158
T. Woolley, F. Fetherston, D. Frost
DGA (dissolved gas analysis) results in a normally operating transformer are shown to be related to the operating condition of the transformer. It is concluded that the dissolved gas generation rates and gas loss from the free breathing conservator is significant. The generation rate of dissolved gases can be reduced dramatically by removing the oxygen from the oil. A method of using a continuous nitrogen purge to deoxygenate and dry the oil is described.<>
{"title":"Changes in levels of dissolved gas in normally operating generator transformers, the effect of a nitrogen breathing system and the effects on interpretation of dissolved gas analysis","authors":"T. Woolley, F. Fetherston, D. Frost","doi":"10.1109/ICPADM.1994.414158","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414158","url":null,"abstract":"DGA (dissolved gas analysis) results in a normally operating transformer are shown to be related to the operating condition of the transformer. It is concluded that the dissolved gas generation rates and gas loss from the free breathing conservator is significant. The generation rate of dissolved gases can be reduced dramatically by removing the oxygen from the oil. A method of using a continuous nitrogen purge to deoxygenate and dry the oil is described.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116314201","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414083
S. Shihab, V. Rao, V. Melik, S. Moorthy
With the rapidly changing technologies and new equipment such as gas insulated switchgear (GIS) and gapless surge arresters, new condition monitoring systems are required to assist looking into specific indicators relating to the equipment conditions. Integrated condition monitoring systems (ICMS) are required to study the multiple parameters and their effect on the equipment condition since plant aging and ultimate failure are usually a result of combined influence of more than one parameter. Artificial neural networks (ANN) have distinctive characteristics such as fault tolerance and analysis of complex networks at high speed and have already been proven to be superior than any other AI techniques for solving problems of diagnostic nature. Hence ANNs can be used for the diagnosis of the insulation problems and condition monitoring of equipment. This paper is intended to describe the planning and design approaches for an integrated condition monitoring system using ANN.<>
{"title":"Planning of a neural network based integrated condition monitoring system for application in substations","authors":"S. Shihab, V. Rao, V. Melik, S. Moorthy","doi":"10.1109/ICPADM.1994.414083","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414083","url":null,"abstract":"With the rapidly changing technologies and new equipment such as gas insulated switchgear (GIS) and gapless surge arresters, new condition monitoring systems are required to assist looking into specific indicators relating to the equipment conditions. Integrated condition monitoring systems (ICMS) are required to study the multiple parameters and their effect on the equipment condition since plant aging and ultimate failure are usually a result of combined influence of more than one parameter. Artificial neural networks (ANN) have distinctive characteristics such as fault tolerance and analysis of complex networks at high speed and have already been proven to be superior than any other AI techniques for solving problems of diagnostic nature. Hence ANNs can be used for the diagnosis of the insulation problems and condition monitoring of equipment. This paper is intended to describe the planning and design approaches for an integrated condition monitoring system using ANN.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134071047","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414126
R. Sheehy, T. Blackburn, J. Rungis
This paper discusses a multi-stress aging test rig for the purpose of accelerated life tests of high voltage stator bars. The test rig employs electrical, mechanical, thermal and frequency aging at 500 Hz to replicate the operating stresses commonly found in high voltage rotating machines. New stator bars are used in the rig to allow the tracking of aging events from initial, non-stressed, values. Partial discharge analysis is used as the primary indication of aging phenomena. The new stator bars will be aged for a period of greater than one year, and, as a result, only preliminary measurements are presented.<>
{"title":"Multistress aging of high voltage stator bars","authors":"R. Sheehy, T. Blackburn, J. Rungis","doi":"10.1109/ICPADM.1994.414126","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414126","url":null,"abstract":"This paper discusses a multi-stress aging test rig for the purpose of accelerated life tests of high voltage stator bars. The test rig employs electrical, mechanical, thermal and frequency aging at 500 Hz to replicate the operating stresses commonly found in high voltage rotating machines. New stator bars are used in the rig to allow the tracking of aging events from initial, non-stressed, values. Partial discharge analysis is used as the primary indication of aging phenomena. The new stator bars will be aged for a period of greater than one year, and, as a result, only preliminary measurements are presented.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133969576","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414113
Y. Li, K. Murata, Y. Tanaka, T. Takada, M. Aihara
This paper describes the principle of the pulsed electroacoustic method (PEA) for space charge profile measurement in lossy and/or dispersive media. The method comprises the following aspects: analyze the principle of the PEA method in lossy and/or dispersive media; estimate the attenuation and dispersion factors in lossy and/or dispersive media; and recover the undistorted waveform from a distorted output signal.<>
{"title":"Space charge distribution measurement in lossy dielectric materials by pulsed electroacoustic method","authors":"Y. Li, K. Murata, Y. Tanaka, T. Takada, M. Aihara","doi":"10.1109/ICPADM.1994.414113","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414113","url":null,"abstract":"This paper describes the principle of the pulsed electroacoustic method (PEA) for space charge profile measurement in lossy and/or dispersive media. The method comprises the following aspects: analyze the principle of the PEA method in lossy and/or dispersive media; estimate the attenuation and dispersion factors in lossy and/or dispersive media; and recover the undistorted waveform from a distorted output signal.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123565649","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414070
Xinyan Wu, Hengkun Xie, Songzhen Wu, Guangbin Liu
In this paper, a multi-function acoustic signal analysis system with a microcontrol chip (TMS320c25) is introduced for detecting defects within groundwall insulation in generator stator windings. When the stator winding is tapped with a vibrator, a sound containing defects information is produced, picked up by an acoustic transducer and analyzed in the frequency domain. The detected results are displayed on a liquid crystal display and printed by a microprinter. Compared with conventional detecting methods, the system has advantages such as higher resolution, real time display of results and convenient operation.<>
{"title":"Detection of defects in groundwall insulation of HV generator stator windings with a microcontroller system","authors":"Xinyan Wu, Hengkun Xie, Songzhen Wu, Guangbin Liu","doi":"10.1109/ICPADM.1994.414070","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414070","url":null,"abstract":"In this paper, a multi-function acoustic signal analysis system with a microcontrol chip (TMS320c25) is introduced for detecting defects within groundwall insulation in generator stator windings. When the stator winding is tapped with a vibrator, a sound containing defects information is produced, picked up by an acoustic transducer and analyzed in the frequency domain. The detected results are displayed on a liquid crystal display and printed by a microprinter. Compared with conventional detecting methods, the system has advantages such as higher resolution, real time display of results and convenient operation.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124747485","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414141
H. Okubo
The recent activity on electrical insulation and its ageing aspect in gas-insulated switchgear (GIS) as well as future trends are described in this paper. Present status of research shows that although there are a lot of reports on computer based partial discharge measurement, there are few on the intrinsic phenomena of fundamental ageing characteristics. These data will be indispensable for extending new concepts of GIS insulation. As an example, it is pointed out that research on electric stress enhancement in solid materials is important, in particular, in relation to life-estimation and life-control techniques as well as with making more compact GIS. For this purpose, the introduction of consistent concepts, from the development/design stages to the testing/operation stages, of GIS is needed. This concept would include sensor integrated GIS, failure-prediction techniques and stress-controlled life-estimation systems. These proposals are described in this paper from the manufacturer's viewpoint.<>
{"title":"Recent activity and future trend on ageing characteristics of electrical insulation in GIS from manufacturer's view point","authors":"H. Okubo","doi":"10.1109/ICPADM.1994.414141","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414141","url":null,"abstract":"The recent activity on electrical insulation and its ageing aspect in gas-insulated switchgear (GIS) as well as future trends are described in this paper. Present status of research shows that although there are a lot of reports on computer based partial discharge measurement, there are few on the intrinsic phenomena of fundamental ageing characteristics. These data will be indispensable for extending new concepts of GIS insulation. As an example, it is pointed out that research on electric stress enhancement in solid materials is important, in particular, in relation to life-estimation and life-control techniques as well as with making more compact GIS. For this purpose, the introduction of consistent concepts, from the development/design stages to the testing/operation stages, of GIS is needed. This concept would include sensor integrated GIS, failure-prediction techniques and stress-controlled life-estimation systems. These proposals are described in this paper from the manufacturer's viewpoint.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125093754","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414021
J. Parpal, C. Guddemi, N. Amyot, É. David
DC testing is extensively used to verify the dielectric integrity of underground cables after installation, repair or maintenance. Although DC testing is very simple and inexpensive (compact test devices), there is some concern that it could affect the lifetime of polymeric insulation. The debate has been raging for many years but there are very few reported studies to help determine whether DC testing should be eliminated and replaced by low-frequency (0.1 Hz) or oscillating-wave tests.<>
{"title":"Influence of DC testing on XLPE insulation lifetime under AC stress","authors":"J. Parpal, C. Guddemi, N. Amyot, É. David","doi":"10.1109/ICPADM.1994.414021","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414021","url":null,"abstract":"DC testing is extensively used to verify the dielectric integrity of underground cables after installation, repair or maintenance. Although DC testing is very simple and inexpensive (compact test devices), there is some concern that it could affect the lifetime of polymeric insulation. The debate has been raging for many years but there are very few reported studies to help determine whether DC testing should be eliminated and replaced by low-frequency (0.1 Hz) or oscillating-wave tests.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124045983","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414051
M. Kojima, Y. Tanaka, T. Takada, Y. Ohki
The paper discusses the residual space charge distribution in gamma-irradiated polyethylene formed with DC voltage, which was measured using the pulsed electroacoustic (PEA) method. The PEA method is one of the advanced nondestructive techniques used to measure the space charge distribution with a high sensitivity and reproducibility. From the experimental result, it became clear that a large amount of positive charges existing near the cathode in gamma-irradiated polyethylene enhance the electric field at the cathode interface. Under short circuit conditions, the strength of this electric field by the space charge is sometimes more than two times the applied field. On the other hand, almost no space charge was observed in the nonirradiated sample.<>
{"title":"Measurement of residual space charge distribution in gamma-irradiated polyethylene","authors":"M. Kojima, Y. Tanaka, T. Takada, Y. Ohki","doi":"10.1109/ICPADM.1994.414051","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414051","url":null,"abstract":"The paper discusses the residual space charge distribution in gamma-irradiated polyethylene formed with DC voltage, which was measured using the pulsed electroacoustic (PEA) method. The PEA method is one of the advanced nondestructive techniques used to measure the space charge distribution with a high sensitivity and reproducibility. From the experimental result, it became clear that a large amount of positive charges existing near the cathode in gamma-irradiated polyethylene enhance the electric field at the cathode interface. Under short circuit conditions, the strength of this electric field by the space charge is sometimes more than two times the applied field. On the other hand, almost no space charge was observed in the nonirradiated sample.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129501201","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.414048
C. Viswanatha, S. N. Moorching
A wide variety of power apparatus in service are exposed to several types of adverse environmental conditions of which one of them is low temperatures. The insulating materials employed in power apparatus should perform satisfactorily at these temperatures for reliable operation of overall units. Insulating materials like polypropylene, cross linked polyethylene, medium density polyethylene and polyvinyl chloride are identified and are subjected to various low temperatures below ambient. The electrical and mechanical properties of insulating materials like volume resistivity, surface resistivity, polarisation index, tensile strength etc., are studied with respect to low temperatures.<>
{"title":"Influence of low temperature conditioning on the electrical and mechanical properties of dielectrics","authors":"C. Viswanatha, S. N. Moorching","doi":"10.1109/ICPADM.1994.414048","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414048","url":null,"abstract":"A wide variety of power apparatus in service are exposed to several types of adverse environmental conditions of which one of them is low temperatures. The insulating materials employed in power apparatus should perform satisfactorily at these temperatures for reliable operation of overall units. Insulating materials like polypropylene, cross linked polyethylene, medium density polyethylene and polyvinyl chloride are identified and are subjected to various low temperatures below ambient. The electrical and mechanical properties of insulating materials like volume resistivity, surface resistivity, polarisation index, tensile strength etc., are studied with respect to low temperatures.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126511951","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 : 1994-07-03DOI: 10.1109/ICPADM.1994.413945
Cheng Lichun, Z. Jiyan, H. Jun-jia
This paper provides the internal electric field distribution and dielectric strength of a high voltage vacuum interrupter. The results of calculation and analysis showed that, by optimizing the insulating structure of the interrupter, especially the shape and the location of the shield, the insulating strength can be significantly improved. A series of standard lightning impulses were applied to a model vacuum interrupter to check these results. The calculated results agree with the test results.<>
{"title":"Investigations on potential distribution and dielectric strength of a high voltage vacuum interrupter","authors":"Cheng Lichun, Z. Jiyan, H. Jun-jia","doi":"10.1109/ICPADM.1994.413945","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413945","url":null,"abstract":"This paper provides the internal electric field distribution and dielectric strength of a high voltage vacuum interrupter. The results of calculation and analysis showed that, by optimizing the insulating structure of the interrupter, especially the shape and the location of the shield, the insulating strength can be significantly improved. A series of standard lightning impulses were applied to a model vacuum interrupter to check these results. The calculated results agree with the test results.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121252983","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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