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2011 Electrical Insulation Conference (EIC).最新文献

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Modelling of low current surface discharges using PSCAD 用PSCAD模拟低电流表面放电
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996166
Xin Zhang, S. Rowland
{"title":"Modelling of low current surface discharges using PSCAD","authors":"Xin Zhang, S. Rowland","doi":"10.1109/EIC.2011.5996166","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996166","url":null,"abstract":"In this work, low current discharges (less than 10 mA) are classified into two forms: unstable discharges and stable arcs. Such discharges may present on outdoor insulation surfaces due to the complex conditions created by the electrical fields, moisture and insulation geometry. The discharges can lead to heating and chemical effects; potentially degrading the insulation surface and accelerating further damage. Modeling of such discharges has been conducted, and a simulation including the test circuit arrangement for the various conditions has been created in the ‘PSCAD’ software. The outcome of current and voltage curves from the simulation show good correlation with experimental data for the range of unstable discharges and stable arcs studied. The simulation work agrees with experiment work in that a low current discharge will become more detrimental if it is transformed from an unstable state to a stable arc, or if the stable arcs are physically compressed in length by any mechanism.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115737815","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}
引用次数: 2
Repetitive transient aging, the influence of rise time 重复瞬态老化，上升时间的影响
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996136
T. Koltunowicz, R. Kochetov, G. Bajracharya, D. Djairam, J. Smit
{"title":"Repetitive transient aging, the influence of rise time","authors":"T. Koltunowicz, R. Kochetov, G. Bajracharya, D. Djairam, J. Smit","doi":"10.1109/EIC.2011.5996136","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996136","url":null,"abstract":"Power electronic devices are becoming very popular as they are linked with renewable energy sources. Their primary use is to switch between DC and AC waveforms so that the energy generated at locations such as wind farms and solar plants can be used by the power grid. Although cheap and reliable, power electronic converters generate repetitive transients that affect HV components such as transformers and cables. The three main features of these transients, repetition frequency, rise time and magnitude are the cause of premature failure in the insulation system of HV devices. Rise time is responsible for the energy injected into the paper insulation as it determines the speed at which cellulose fibers are polarized. This causes movement at a molecular level which weakens the insulation. Increasing the speed at which the transient reaches its maximum level causes bigger damages to the insulation. Polarity also has an effect. Results are presented in this contribution when transients of different rise time are applied to oil impregnated cellulose.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"164 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127532264","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}
引用次数: 5
Parameter studies on surface partial discharge inception of polluted, tangential electrically stressed boundary surfaces 受污染切向电应力边界表面局部放电起始的参数研究
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996128
R. Schmerling, F. Jenau, S. Kempen, F. Pohlmann
{"title":"Parameter studies on surface partial discharge inception of polluted, tangential electrically stressed boundary surfaces","authors":"R. Schmerling, F. Jenau, S. Kempen, F. Pohlmann","doi":"10.1109/EIC.2011.5996128","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996128","url":null,"abstract":"Compact stator end windings of large turbine generators are stressed by tangentially stressed boundary surfaces. To achieve an optimal design, the electrical field strength has to be below the partial discharge (PD) inception field strength. In regular operation — especially for air cooled machines — several environmental impacts could affect the PD inception field strength inside stator end winding configurations, especially the influence of dust, dirt and ambient moisture. Therefore investigations are necessary to classify contamination influences in regard to its potential to cause surface corona.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125796733","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}
引用次数: 4
A novel system for generation, acquisition and analyses of partial discharges 一种新的局部放电产生、采集和分析系统
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996139
P. Basappa, V. Lakdawala, K. Agarwal, G. Gerdin, G. Shivaraj
{"title":"A novel system for generation, acquisition and analyses of partial discharges","authors":"P. Basappa, V. Lakdawala, K. Agarwal, G. Gerdin, G. Shivaraj","doi":"10.1109/EIC.2011.5996139","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996139","url":null,"abstract":"A typical set of partial discharges (PD) occurring in insulation systems can be characterized by a three dimensional plot of their phase ‘Φ’ on the power line cycle, apparent charge magnitude ‘q’ and the number of pulses ‘n’. A digital acquisition system is developed which can measure ‘Φ’ and ‘q’ values of ‘n’ PD's occurring on a given power line voltage and then plot n (φ, q). The system is developed using the data acquisition card NI-5112, which is a 2-channel high speed digitizer (100 MS/s) with the acquisition and analyses programs written in LabVIEW. The system is being tested using artificially generated PD pulses which have variable ‘Φ’ and ‘q’.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126173354","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}
引用次数: 1
A numerical model for the electrical breakdown of air within a gap under standard atmospheric conditions: One-dimensional versus two-dimensional approach 标准大气条件下间隙内空气电击穿的数值模型:一维与二维方法
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996184
D. Smith, S. McMeekin, B. Stewart, P. Wallace
{"title":"A numerical model for the electrical breakdown of air within a gap under standard atmospheric conditions: One-dimensional versus two-dimensional approach","authors":"D. Smith, S. McMeekin, B. Stewart, P. Wallace","doi":"10.1109/EIC.2011.5996184","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996184","url":null,"abstract":"A numerical model which simulates the electrical breakdown of air between parallel-plates at atmospheric pressure is presented in this paper. The modelling techniques and results are compared using a one-dimensional and two-dimensional axisymmetrical approach. Hydrodynamic drift-diffusion equations are coupled with the Poison equation and solved for the transportation of electrons, positive ions and negative ions in an electric field. A negative DC voltage is applied to the cathode at various gap separation distances and the voltage is increased until sparking occurs. Sparking voltage to separation distance characteristic curves are derived and compared to the Paschen curve. Calculations are made for the external discharge current for varying separation gaps. A characteristic curve of current versus voltage is evaluated against typical curves found in the literature. The discharge regime regions leading to a Townsend discharge are identified from the numerical simulations.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125312716","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}
引用次数: 2
Practical issues of partial discharge testing of low-voltage cables 低压电缆局部放电试验的实际问题
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996121
R. Cselkó, Z. A. Tamus, I. Berta
{"title":"Practical issues of partial discharge testing of low-voltage cables","authors":"R. Cselkó, Z. A. Tamus, I. Berta","doi":"10.1109/EIC.2011.5996121","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996121","url":null,"abstract":"Demand for low voltage cable diagnostics, arising from lifetime extension programs of power plants, grows recently. This paper reports on investigations of the authors with partial discharge testing of low voltage control, measurement and signal cables. The construction of low voltage cables differs in many ways from the middle voltage and high voltage cables, on which partial discharge diagnostics has been widely investigated and highly developed. The lack of semiconducting layers makes them less lossy on higher frequencies than MV and HV ones. These results in a different behavior of the propagation of PD induced impulses. Besides, without smoothing layers, these cables are not necessarily PD free at their test voltage. Due to the issues mentioned above, the bandwidth and impulse resolution of the measuring equipment were addressed as well as the discrimination between discharge impulses formed in the insulation bulk and on the conductor surfaces. Measurements were carried out on single and multiple conductor cables by equipments with different bandwidth. The results of the investigation are presented and discussed in this paper.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122413387","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}
引用次数: 3
Detection of partial discharge signals in high voltage XLPE cables using time domain features 利用时域特征检测高压XLPE电缆局部放电信号
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996179
R. Ambikairajah, B. Phung, J. Ravishankar, T. Blackburn, Z. Liu
{"title":"Detection of partial discharge signals in high voltage XLPE cables using time domain features","authors":"R. Ambikairajah, B. Phung, J. Ravishankar, T. Blackburn, Z. Liu","doi":"10.1109/EIC.2011.5996179","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996179","url":null,"abstract":"Almost all cases of insulation degradation in high voltage cables are due to partial discharge (PD) activity. To date, wavelet based analysis has been widely used to extract PD pulses from noisy environments. This paper explores the use of time domain features, namely short-time energy and short-time zero-crossing counts, to detect the presence of partial discharge signals prior to de-noising the signal for further investigation. In order to demonstrate the effectiveness of short-time energy and zero-crossing counts to identify PD signals embedded in noise, these features are tested with laboratory data. To further verify these results, real data was collected from a substation and the overall results demonstrate that these two time domain features are very effective in identifying PD pulses and are computationally efficient such that they can be considered for use in online PD monitoring.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128613839","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}
引用次数: 5
A simulation method for winter pollution contamination of HV insulators 高压绝缘子冬季污染模拟方法研究
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996181
N. Ravelomanantsoa, M. Farzaneh, W. Chisholm
{"title":"A simulation method for winter pollution contamination of HV insulators","authors":"N. Ravelomanantsoa, M. Farzaneh, W. Chisholm","doi":"10.1109/EIC.2011.5996181","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996181","url":null,"abstract":"This paper presents a novel method to improve simulation of the road salt deposit process on energized high voltage insulators under winter conditions. A pollution generator system prototype was especially designed to produce an external mixing of dry solid contaminants (kaolin powder) with supercooled atomized brine droplets. The formed pollutant particles are transported by air flow, which is produced by a speed variable fan, and then settle on the energized specimen insulator surface which is installed at a specific distance of the pollution generator nozzle. The pollution accumulation process took place inside a climate chamber at −5°C. At the end of each ten-minute exposure, specimen insulators were removed for ESDD measurement according to the IEC 60815 standard. No pre-treatment of the insulator surface is needed and contrary to most of the other contamination methods, it enables study of the rate of increase of ESDD with wind speed and insulator profile under winter conditions. The combined effect of wind speed and dielectrophoretic force was also investigated using a 45-kV ac variable voltage source.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126919972","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}
引用次数: 15
Insulation resistance and polarization of rotating machines 旋转机械的绝缘电阻和极化
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996156
S. Bhumiwat
{"title":"Insulation resistance and polarization of rotating machines","authors":"S. Bhumiwat","doi":"10.1109/EIC.2011.5996156","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996156","url":null,"abstract":"This contribution explains insulation resistance and polarization of rotating machines through measurement results of Polarization Depolarization Current (PDC), or charging and discharging current, of machines having different types and conditions of insulation aging. It demonstrates why the Polarization Index (P.I.) cannot be used individually to judge insulation dryness and why the product of insulation resistance and capacitance is a better measure of insulation quality than the insulation resistance alone. But it is the combination of PDC, Capacitance ratio and Dielectric Dissipation Factor (DDF) which provides a decisive key in the diagnosis of global problems in machine insulation.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123391342","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}
引用次数: 9
Experience with UHF partial discharge detection and location in power transformers 具有电力变压器超高频局部放电检测和定位经验
2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996146
M. Judd
{"title":"Experience with UHF partial discharge detection and location in power transformers","authors":"M. Judd","doi":"10.1109/EIC.2011.5996146","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996146","url":null,"abstract":"Ultra-high frequency (UHF) methods for detecting and locating partial discharges (PD) are well established for gas insulated equipment. This paper provides an overview of their application to power transformers, discussing practicalities, capabilities and challenges. In recent years, UHF PD detection has proved helpful to manufacturers as a tool for enhancing quality control. The technique can now form a valuable addition to the suite of on-line monitoring technologies available for power transformers. A key aspect discussed in this paper is the installation of sensors, which must have an electromagnetic ‘view’ into the Faraday cage of the tank. Locating PD sources by time-of-flight methods in transformers requires accurate spatial resolution in three dimensions in the presence of large conducting components inside the tank that often block the line of sight between PD source and sensor. For this reason, instead of an ‘empty box’ representation, modeling techniques are used to account for the internal structure of the transformer so that observed time differences among PD signals received at different sensors can be interpreted more realistically. The PD location procedure is illustrated by means of practical results, which indicate that PD sources can be located typically to within 0.3 m in a power transformer.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123664928","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}
引用次数: 35
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