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.2002.995922
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}
Pub Date : 2002-04-07DOI: 10.1109/ELINSL.2002.995987
C. Caironi, D. Brie, L. Durantay, A. Rezzoug
The development of time-frequency and time-scale transforms has progressed quickly for 20 years. This development and the progression of the numerical acquisition enable the utilization of these mathematical tools to analyze partial discharges (PD) in the induction motors insulation. Some papers have been written about the wavelet tools in order to analyze the partial discharges. This paper is a tutorial overview of the time frequency and time scale transforms applied to the PD analysis on the stators of the induction motors. In the first part two time-frequency transforms are introduced: short time Fourier transform and Wigner distribution. The mathematical tools for the implementation of the STFT are given. An example of extraction of a PD signal from numeric noise is given and its results discussed. In the second part the wavelets are presented on the same case study as for the time frequency transforms.
{"title":"Interest and utility of time frequency and time scale transforms in the partial discharges analysis","authors":"C. Caironi, D. Brie, L. Durantay, A. Rezzoug","doi":"10.1109/ELINSL.2002.995987","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995987","url":null,"abstract":"The development of time-frequency and time-scale transforms has progressed quickly for 20 years. This development and the progression of the numerical acquisition enable the utilization of these mathematical tools to analyze partial discharges (PD) in the induction motors insulation. Some papers have been written about the wavelet tools in order to analyze the partial discharges. This paper is a tutorial overview of the time frequency and time scale transforms applied to the PD analysis on the stators of the induction motors. In the first part two time-frequency transforms are introduced: short time Fourier transform and Wigner distribution. The mathematical tools for the implementation of the STFT are given. An example of extraction of a PD signal from numeric noise is given and its results discussed. In the second part the wavelets are presented on the same case study as for the time frequency transforms.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"27 1","pages":"516-522"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88072206","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.2002.995941
W. McDermid
Power transformers installed in the 1960s and 1970s were protected by surge arresters with gaps and silicon carbide valve elements. Many of these arresters are still in service but the population is declining. By 1980, gapless zinc oxide arresters were being installed in all new installations. There are two reliability issues involving surge arresters: adequacy of protection and consequential damage resulting from in-service failure.
{"title":"Reliability of station class surge arresters","authors":"W. McDermid","doi":"10.1109/ELINSL.2002.995941","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995941","url":null,"abstract":"Power transformers installed in the 1960s and 1970s were protected by surge arresters with gaps and silicon carbide valve elements. Many of these arresters are still in service but the population is declining. By 1980, gapless zinc oxide arresters were being installed in all new installations. There are two reliability issues involving surge arresters: adequacy of protection and consequential damage resulting from in-service failure.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"96 1","pages":"320-322"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86677528","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.2002.995877
M. Fenger, B. Lloyd, J. Pedersen
Random wound stator windings in motors operating in utility and industrial plants through out the world have been reported to suffer from premature winding failures. Although several failure mechanisms exist, some of these failures have been caused by exposure to fast rise-time voltage surges coming from inverter drives. Dissection of failed stator windings have indicated that partial discharges have been a predominate cause of the stator failure. Partial discharges may occur between turns during fast rise-time voltage surges and result in degradation of the organic magnet wire enamel impregnants, eventually resulting in turn-to-turn or phase-to-phase failures. In this paper, measurements of the surge environment for several motors are presented, some of which have suffered stator winding failures. Inspection of the winding after failure showed local melting caused by puncture of the insulation. Utilizing custom PD detection instrumentation and a variable rise-time surge generator, measurements of partial discharge inception voltage (DIV) have been made. Combining the DIV data; with the actual surge environment from inverter drive allows assessment of the risk of motor failure due to PD related insulation breakdown.
{"title":"Surge related partial discharges resulting from IFDs applied to random wound motors","authors":"M. Fenger, B. Lloyd, J. Pedersen","doi":"10.1109/ELINSL.2002.995877","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995877","url":null,"abstract":"Random wound stator windings in motors operating in utility and industrial plants through out the world have been reported to suffer from premature winding failures. Although several failure mechanisms exist, some of these failures have been caused by exposure to fast rise-time voltage surges coming from inverter drives. Dissection of failed stator windings have indicated that partial discharges have been a predominate cause of the stator failure. Partial discharges may occur between turns during fast rise-time voltage surges and result in degradation of the organic magnet wire enamel impregnants, eventually resulting in turn-to-turn or phase-to-phase failures. In this paper, measurements of the surge environment for several motors are presented, some of which have suffered stator winding failures. Inspection of the winding after failure showed local melting caused by puncture of the insulation. Utilizing custom PD detection instrumentation and a variable rise-time surge generator, measurements of partial discharge inception voltage (DIV) have been made. Combining the DIV data; with the actual surge environment from inverter drive allows assessment of the risk of motor failure due to PD related insulation breakdown.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"21 1","pages":"44-48"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86190916","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.2002.995867
K. Kimura, S. Itaya, M. Hikita
Power devices such as IGBT generate switching surges with steep-front waveform in sub-microsecond times. The highly repetitive surges may lead to unexpected insulation ageing of inverter-fed low-voltage motor windings, which have been designed without consideration of partial discharges (PD). Since the distance between adjacent magnet wires in a stator slot distributes in /spl mu/m to mm, so-called micro-discharge of very short gap with steep-front surges have been investigated. In order to evaluate PD ageing of polymer material under steep-front surges, we started the fundamental study of PD inception condition under step voltage with rise-time of nanoseconds. Using rod-plate electrodes with 20-50 /spl mu/m air gaps, time delay and charge buildup were measured simultaneously. It was found that charge builds up with PD instantly and decreases very slowly in comparison with repetitive pulse intervals of PWM. The effect of the surface charge on PD inception of the following surge is discussed.
功率器件如IGBT在亚微秒时间内产生具有陡前波形的开关浪涌。高度重复的浪涌可能导致逆变器供电的低压电机绕组意外的绝缘老化，这些绕组在设计时没有考虑局部放电(PD)。由于定子槽内相邻磁线之间的距离分布在/spl μ /m到mm之间，因此研究了极短间隙陡前浪涌的微放电现象。为了评价聚合物材料在陡坡前浪涌作用下的局部放电老化，我们对上升时间为纳秒级的阶跃电压下的局部放电起始条件进行了基础研究。采用气隙为20 ~ 50 μ m /spl μ m的棒板电极，同时测量时间延迟和电荷积累。研究发现，与PWM的重复脉冲间隔相比，PD的电荷积累是瞬间的，而减少的速度非常慢。讨论了表面电荷对后续浪涌PD起始的影响。
{"title":"Partial discharge behavior on PI film with microgap under steep-front step voltage","authors":"K. Kimura, S. Itaya, M. Hikita","doi":"10.1109/ELINSL.2002.995867","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995867","url":null,"abstract":"Power devices such as IGBT generate switching surges with steep-front waveform in sub-microsecond times. The highly repetitive surges may lead to unexpected insulation ageing of inverter-fed low-voltage motor windings, which have been designed without consideration of partial discharges (PD). Since the distance between adjacent magnet wires in a stator slot distributes in /spl mu/m to mm, so-called micro-discharge of very short gap with steep-front surges have been investigated. In order to evaluate PD ageing of polymer material under steep-front surges, we started the fundamental study of PD inception condition under step voltage with rise-time of nanoseconds. Using rod-plate electrodes with 20-50 /spl mu/m air gaps, time delay and charge buildup were measured simultaneously. It was found that charge builds up with PD instantly and decreases very slowly in comparison with repetitive pulse intervals of PWM. The effect of the surface charge on PD inception of the following surge is discussed.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"50 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80426023","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.2002.995868
YongJun Kim, Ki-Chang Lee, D. Hwang, Doh-Young Park, S. Song
An instrument for the online monitoring of partial discharges becomes a more expensive investment option for generators of less than 100 MVA. For those machines, an economic unit of partial discharge measurements has been envisaged by simultaneously adopting a peak-detect-and-hold technique and an inherent analogue-to-digital (A/D) conversion function already embedded in a microprocessor or DSP (digital signal processor). This technique is named as hybrid conversion scheme.
{"title":"Hybrid conversion scheme for digital measurement of partial discharge spectra","authors":"YongJun Kim, Ki-Chang Lee, D. Hwang, Doh-Young Park, S. Song","doi":"10.1109/ELINSL.2002.995868","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995868","url":null,"abstract":"An instrument for the online monitoring of partial discharges becomes a more expensive investment option for generators of less than 100 MVA. For those machines, an economic unit of partial discharge measurements has been envisaged by simultaneously adopting a peak-detect-and-hold technique and an inherent analogue-to-digital (A/D) conversion function already embedded in a microprocessor or DSP (digital signal processor). This technique is named as hybrid conversion scheme.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"41 1","pages":"5-8"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79902119","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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