Pub Date : 1994-07-03DOI: 10.1109/ICPADM.1994.413989
L. Audouin, J. Verdu
Initial weight loss kinetics of industrial extruded samples of poly(vinyl chloride) (PVC) plasticized respectively by 15, 20, 25 and 30 weight % of di(2-ethyl hexyl)phthalate, dinonylphthalate, didecylphthalate and diundecylphthalate were studied at 85, 95, 105 and 120/spl deg/C. Principally two distinct kinetic regimes of weight loss were observed: Regime 1 characterized by weight loss proportional to time and corresponding to a process controlled by evaporation. This regime predominates for high molecular weight plasticizers especially at high plasticizer concentrations (/spl ges/20 weight %). Regime 2, in which the weight loss is proportional to a square root of time, is typical for kinetic control by diffusion according to Fickian law. It was observed for low molecular weight plasticizers at low concentrations (/spl les/20 weight %). The depth distribution of plasticizer in the bulk sample depends also of the principal kinetic regime. In all samples in which evaporation controlled weight loss was observed, the plasticizer concentration was rather homogeneously distributed into the sample depth. On the contrary, the important decrease of plasticizer concentration in the superficial layers was observed in all cases of diffusion controlled of plasticizer loss.<>
{"title":"Thermal ageing of plasticized PVC: effect of loss kinetics on plasticizer depth distribution","authors":"L. Audouin, J. Verdu","doi":"10.1109/ICPADM.1994.413989","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413989","url":null,"abstract":"Initial weight loss kinetics of industrial extruded samples of poly(vinyl chloride) (PVC) plasticized respectively by 15, 20, 25 and 30 weight % of di(2-ethyl hexyl)phthalate, dinonylphthalate, didecylphthalate and diundecylphthalate were studied at 85, 95, 105 and 120/spl deg/C. Principally two distinct kinetic regimes of weight loss were observed: Regime 1 characterized by weight loss proportional to time and corresponding to a process controlled by evaporation. This regime predominates for high molecular weight plasticizers especially at high plasticizer concentrations (/spl ges/20 weight %). Regime 2, in which the weight loss is proportional to a square root of time, is typical for kinetic control by diffusion according to Fickian law. It was observed for low molecular weight plasticizers at low concentrations (/spl les/20 weight %). The depth distribution of plasticizer in the bulk sample depends also of the principal kinetic regime. In all samples in which evaporation controlled weight loss was observed, the plasticizer concentration was rather homogeneously distributed into the sample depth. On the contrary, the important decrease of plasticizer concentration in the superficial layers was observed in all cases of diffusion controlled of plasticizer loss.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"19 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":"122383239","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.1994.414025
A. Wajima, Y. Ehara, H. Kishida, T. Sakai, T. Ito
In this paper, it is shown that a semiconducting layer has an effect on the void discharge deterioration. Polymethylmethacrylate (PMMA) block with an artificial needle void at a tip of semiconductive electrode (SE) was used as a sample. The tree initiation voltage was measured. The discharge magnitude distribution was measured by the partial discharge pulse measurement system (PDPMS). At the same time, the void condition and the tree growth were observed by CCD camera. These measurements were carried out by SEs of several resistivities. As a result, by measuring the discharge magnitude distribution, it became clear that SE inhibited the void discharge. It was confirmed that the electrode inhibited tree growth. The highest tree initiation voltage and the lowest tree extension speed were shown at a resistivity of 2 k/spl Omega//spl middot/cm.<>
{"title":"Tree initiation from artificial void with semiconductive electrode in PMMA","authors":"A. Wajima, Y. Ehara, H. Kishida, T. Sakai, T. Ito","doi":"10.1109/ICPADM.1994.414025","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414025","url":null,"abstract":"In this paper, it is shown that a semiconducting layer has an effect on the void discharge deterioration. Polymethylmethacrylate (PMMA) block with an artificial needle void at a tip of semiconductive electrode (SE) was used as a sample. The tree initiation voltage was measured. The discharge magnitude distribution was measured by the partial discharge pulse measurement system (PDPMS). At the same time, the void condition and the tree growth were observed by CCD camera. These measurements were carried out by SEs of several resistivities. As a result, by measuring the discharge magnitude distribution, it became clear that SE inhibited the void discharge. It was confirmed that the electrode inhibited tree growth. The highest tree initiation voltage and the lowest tree extension speed were shown at a resistivity of 2 k/spl Omega//spl middot/cm.<<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":"128311368","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.1994.414123
A. Kuitunen, J. Partanen
The effect of the lifetime of medium voltage underground cable networks on the network costs is studied. The cable manufacturer has estimated how much the cost of manufacturing the medium voltage XLPE power cable changes as a function of the cable lifetime. The shorter the lifetime, the cheaper the cable is, but a short lifetime leads to higher construction costs because the cable network must be rebuilt more frequently. The costs due to the cable network are represented by a simplified cost function, where the lifetime of the cable is a variable. The optimal lifetime of the medium voltage cable network is determined by minimizing the cost function over a long period of time. Besides the economic dimensioning of the underground cable network, the technical constraints and the effect of the lifetime of the cable network on the network configuration should be taken into account when minimizing the cost function. No real optimization method appears to exist for the problem. A network design program written at Tampere University of Technology (TUT) and a test network were therefore utilized in solving the problem.<>
{"title":"The optimal lifetime of the medium voltage underground cable networks of utilities","authors":"A. Kuitunen, J. Partanen","doi":"10.1109/ICPADM.1994.414123","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414123","url":null,"abstract":"The effect of the lifetime of medium voltage underground cable networks on the network costs is studied. The cable manufacturer has estimated how much the cost of manufacturing the medium voltage XLPE power cable changes as a function of the cable lifetime. The shorter the lifetime, the cheaper the cable is, but a short lifetime leads to higher construction costs because the cable network must be rebuilt more frequently. The costs due to the cable network are represented by a simplified cost function, where the lifetime of the cable is a variable. The optimal lifetime of the medium voltage cable network is determined by minimizing the cost function over a long period of time. Besides the economic dimensioning of the underground cable network, the technical constraints and the effect of the lifetime of the cable network on the network configuration should be taken into account when minimizing the cost function. No real optimization method appears to exist for the problem. A network design program written at Tampere University of Technology (TUT) and a test network were therefore utilized in solving the problem.<<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":"129739517","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.1994.414074
M. Hikita, H. Yamashita, T. Kato, N. Hayakawa, T. Ueda, H. Okubo
The authors measured electromagnetic spectrum radiated from partial discharge with a magnitude from 80 to 50,000 pC occurring in needle-plane electrodes. Experimental results showed that the gain of the electromagnetic wave decreased with increasing the distance from PD source in the frequency range from 35 to 50 MHz. The results were discussed in terms of a model assuming that electromagnetic wave radiation from a small dipole antenna simulates that from the PD source. Consequently, the distance characteristics of the signal gain proved to agree well with the theoretical calculation. An attempt was also made to measure separately the electromagnetic spectrum caused by positive and negative PD pulses. At the same time, PD pulses were measured with a computer-aided measuring system. The authors discussed the relationship between the PD statistical characteristics and the electromagnetic spectrum.<>
{"title":"Electromagnetic spectrum caused by partial discharge in air under AC and DC voltage application","authors":"M. Hikita, H. Yamashita, T. Kato, N. Hayakawa, T. Ueda, H. Okubo","doi":"10.1109/ICPADM.1994.414074","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414074","url":null,"abstract":"The authors measured electromagnetic spectrum radiated from partial discharge with a magnitude from 80 to 50,000 pC occurring in needle-plane electrodes. Experimental results showed that the gain of the electromagnetic wave decreased with increasing the distance from PD source in the frequency range from 35 to 50 MHz. The results were discussed in terms of a model assuming that electromagnetic wave radiation from a small dipole antenna simulates that from the PD source. Consequently, the distance characteristics of the signal gain proved to agree well with the theoretical calculation. An attempt was also made to measure separately the electromagnetic spectrum caused by positive and negative PD pulses. At the same time, PD pulses were measured with a computer-aided measuring system. The authors discussed the relationship between the PD statistical characteristics and the electromagnetic spectrum.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"14 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":"129572594","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.1994.413972
M. Iwamoto, T. Kubota
The electron transport mechanism through polyimide (PI) Langmuir-Blodgett (LB) films, with monolayer thickness of 0.4 nm, was investigated by means of current-voltage (I-V) measurement and Inelastic Electron Tunneling Spectroscopy (IETS). Tunnel junctions with a structure of Au/PI/Pb were examined. It was found that electrons tunnel across the PI LB films without loss of their own energy. Tunnel junctions with a PORPI monolayer sandwiched between PI layers were also examined. Here PORPI is polyimide containing tetraphenylporphyrin moiety. It was found that electrons tunnel across the junctions, accompanying the energy loss due to the excitation of vibrational modes of PORPI molecules and the excitation of electron transitions in PORPI molecules.<>
{"title":"Elastic and inelastic tunneling through polyimide LB films","authors":"M. Iwamoto, T. Kubota","doi":"10.1109/ICPADM.1994.413972","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.413972","url":null,"abstract":"The electron transport mechanism through polyimide (PI) Langmuir-Blodgett (LB) films, with monolayer thickness of 0.4 nm, was investigated by means of current-voltage (I-V) measurement and Inelastic Electron Tunneling Spectroscopy (IETS). Tunnel junctions with a structure of Au/PI/Pb were examined. It was found that electrons tunnel across the PI LB films without loss of their own energy. Tunnel junctions with a PORPI monolayer sandwiched between PI layers were also examined. Here PORPI is polyimide containing tetraphenylporphyrin moiety. It was found that electrons tunnel across the junctions, accompanying the energy loss due to the excitation of vibrational modes of PORPI molecules and the excitation of electron transitions in PORPI molecules.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"1 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":"130529528","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.1994.414140
D. Allan
In this paper, the theme of ageing and remnant insulation life is addressed from the viewpoint of the power equipment user. Aspects of the theme are developed, using as examples the oil impregnated paper insulating systems of power transformers. Other insulating systems are briefly reviewed using equipment of common use in a power utility as examples. Finally some major challenges for the future are given, particularly in relation to insulation research priority and methodology.<>
{"title":"Insulation ageing-a users perspective","authors":"D. Allan","doi":"10.1109/ICPADM.1994.414140","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414140","url":null,"abstract":"In this paper, the theme of ageing and remnant insulation life is addressed from the viewpoint of the power equipment user. Aspects of the theme are developed, using as examples the oil impregnated paper insulating systems of power transformers. Other insulating systems are briefly reviewed using equipment of common use in a power utility as examples. Finally some major challenges for the future are given, particularly in relation to insulation research priority and methodology.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"28 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114105563","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.1994.414152
A. Zahedi
The metal oxide varistors are used as voltage dependent switching devices to protect high voltage equipment and also low voltage electronic devices against transient overvoltages. The performance of a ZnO surge arrester (SA) is determined by the electrical and thermal properties of metal oxide elements, insulating materials used and design features of SA. The primary consideration in applying metal oxide SA is the thermal consideration of the environment. Ambient temperature and environmental conditions directly affect the performance of internal current drawn by and energy input to the metal oxide SA. The interaction between the polluted porcelain housing and the inner varistor columns due to capacitive coupling is responsible for the temperature rise of the varistor element. Metal oxide SAs are exposed to heavy thermal and electrical stresses if the porcelain housings of the units are polluted by industrial dusts, coastal salts, etc. The first part of this paper proposes an electrical model of SA that is computer simulated for leakage current investigation and the second part presents the effect of dry band on the performance of SA and damage due to this dry band.<>
{"title":"Effect of dry band on performance of UHV surge arrester and leakage current monitoring, using new developed model","authors":"A. Zahedi","doi":"10.1109/ICPADM.1994.414152","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414152","url":null,"abstract":"The metal oxide varistors are used as voltage dependent switching devices to protect high voltage equipment and also low voltage electronic devices against transient overvoltages. The performance of a ZnO surge arrester (SA) is determined by the electrical and thermal properties of metal oxide elements, insulating materials used and design features of SA. The primary consideration in applying metal oxide SA is the thermal consideration of the environment. Ambient temperature and environmental conditions directly affect the performance of internal current drawn by and energy input to the metal oxide SA. The interaction between the polluted porcelain housing and the inner varistor columns due to capacitive coupling is responsible for the temperature rise of the varistor element. Metal oxide SAs are exposed to heavy thermal and electrical stresses if the porcelain housings of the units are polluted by industrial dusts, coastal salts, etc. The first part of this paper proposes an electrical model of SA that is computer simulated for leakage current investigation and the second part presents the effect of dry band on the performance of SA and damage due to this dry band.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"82 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":"114490614","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.1994.414080
H. J. van der Merwe, J. Drommi, A. Wolmarans
The Electricity Supply Commission of South Africa (Eskom) and Electricite de France (EDF) are involved in a technical exchange agreement whereby the effectiveness of the EDF method for stator winding insulation condition assessment, specifically on turbogenerators, will be investigated. This method basically entails off-line electrical quadratic rate partial discharge measurements, using relatively low center-frequency narrow band filters. Initial experience gained through measurements on two turbogenerators of Eskom in South Africa, has shown the ability of this method to accurately indicate the insulation condition of stator windings. On one of the generators tested, excellent correlation was found between the indications of test results and the findings of a stator bar visual inspection and dissection. Dissipation factor and conventional peak-value partial discharge measurements have in the past failed to indicate the extend of insulation damage (discovered through visual inspections) of this specific winding.<>
{"title":"Initial experience with quadratic rate partial discharge tests on the stator winding insulation of power generators in South Africa","authors":"H. J. van der Merwe, J. Drommi, A. Wolmarans","doi":"10.1109/ICPADM.1994.414080","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414080","url":null,"abstract":"The Electricity Supply Commission of South Africa (Eskom) and Electricite de France (EDF) are involved in a technical exchange agreement whereby the effectiveness of the EDF method for stator winding insulation condition assessment, specifically on turbogenerators, will be investigated. This method basically entails off-line electrical quadratic rate partial discharge measurements, using relatively low center-frequency narrow band filters. Initial experience gained through measurements on two turbogenerators of Eskom in South Africa, has shown the ability of this method to accurately indicate the insulation condition of stator windings. On one of the generators tested, excellent correlation was found between the indications of test results and the findings of a stator bar visual inspection and dissection. Dissipation factor and conventional peak-value partial discharge measurements have in the past failed to indicate the extend of insulation damage (discovered through visual inspections) of this specific winding.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"127 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":"122493645","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.1994.414030
H. Kawamura, M. Nawata
The space charge in water tree degraded LDPE has been measured by the thermally stimulated current (TSC) method. The shape of the TSC spectra does not change with the degradation of polymeric insulation containing water trees, but the TSC peak increases linearly with the increase of the length of the water tree. It is shown that the TSC measuring method can adapt to evaluate the degradation caused by water treeing.<>
{"title":"Space charge accumulation in water tree degraded LDPE and its evaluation by TSC method","authors":"H. Kawamura, M. Nawata","doi":"10.1109/ICPADM.1994.414030","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414030","url":null,"abstract":"The space charge in water tree degraded LDPE has been measured by the thermally stimulated current (TSC) method. The shape of the TSC spectra does not change with the degradation of polymeric insulation containing water trees, but the TSC peak increases linearly with the increase of the length of the water tree. It is shown that the TSC measuring method can adapt to evaluate the degradation caused by water treeing.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"5 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":"125749656","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.1994.414102
T. Kawasaki, T. Terashima, T. Takada, T. Maeno
A visualization and a quantification technique of a latent electric charge image on a dielectric material has been developed by using Pockels effect and a computer image processing. An optical phase modulation technique and computer image lock-in amplifier processing were used to improve the signal to noise ratio. The measurement system has several improved performances: a sensitivity of surface charge of 1 nC cm/sup -2/; a spatial resolution of 200 /spl mu/m; and discrimination of the charge polarity. The basic principle of advanced electrooptic surface charge measurement is described and the typical surface charge distribution of a positive discharge streamer produced by an impulse high voltage (5 kV/sub peak/) is demonstrated. A comparison is also made between the modulation method and the nonmodulation method.<>
{"title":"Visualization of surface charge distribution on insulating films using spatial optical phase modulation system","authors":"T. Kawasaki, T. Terashima, T. Takada, T. Maeno","doi":"10.1109/ICPADM.1994.414102","DOIUrl":"https://doi.org/10.1109/ICPADM.1994.414102","url":null,"abstract":"A visualization and a quantification technique of a latent electric charge image on a dielectric material has been developed by using Pockels effect and a computer image processing. An optical phase modulation technique and computer image lock-in amplifier processing were used to improve the signal to noise ratio. The measurement system has several improved performances: a sensitivity of surface charge of 1 nC cm/sup -2/; a spatial resolution of 200 /spl mu/m; and discrimination of the charge polarity. The basic principle of advanced electrooptic surface charge measurement is described and the typical surface charge distribution of a positive discharge streamer produced by an impulse high voltage (5 kV/sub peak/) is demonstrated. A comparison is also made between the modulation method and the nonmodulation method.<<ETX>>","PeriodicalId":331058,"journal":{"name":"Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)","volume":"341 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":"122996215","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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