Pub Date : 2012-12-01DOI: 10.1109/ICPEN.2012.6492322
Bhargabjyoti Saikia, R. Subadar
Expressions of spectral efficiency have been obtained for optimal and suboptimal adaptive transmission techniques with uncoded MQAM (multilevel quadrature amplitude modulation) over Two Wave Diffuse Power (TWDP) fading channels. Probability density function of signal-to-noise ratio is used to obtain the expressions. A study of the effect of fading parameters on the spectral efficiency of different techniques has been presented.
{"title":"Power and rate adaptation techniques with uncoded MQAM over TWDP fading channels","authors":"Bhargabjyoti Saikia, R. Subadar","doi":"10.1109/ICPEN.2012.6492322","DOIUrl":"https://doi.org/10.1109/ICPEN.2012.6492322","url":null,"abstract":"Expressions of spectral efficiency have been obtained for optimal and suboptimal adaptive transmission techniques with uncoded MQAM (multilevel quadrature amplitude modulation) over Two Wave Diffuse Power (TWDP) fading channels. Probability density function of signal-to-noise ratio is used to obtain the expressions. A study of the effect of fading parameters on the spectral efficiency of different techniques has been presented.","PeriodicalId":336723,"journal":{"name":"2012 1st International Conference on Power and Energy in NERIST (ICPEN)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123533775","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 : 2012-12-01DOI: 10.1109/ICPEN.2012.6492331
Debadyuti Banerjee, S. Mazumdar, A. K. Sur
This paper presents the design and performance of an electronic ballast which provides a constant light output for wide input voltage fluctuations from 85V to 265V. Two IC's have been used in the design: the first part has a PFC controller IC and the second part IC is a ballast driver. The PFC circuit produces and maintains a constant power factor and a constant voltage of 400 V. The second part, the ballast driver IC feeds voltage to a resonant half bridge inverter operating in Zero Voltage Switching (ZVS) resonant mode, thereby reducing switching losses and the electromagnetic interference. The output to this part is constant light for the specified voltage range. Experimental results of the electronic ballast driving 36W fluorescent lamps are presented in order to confirm the feasibility of the performed design methodology.
{"title":"Design & performance analysis of a power-factor-corrected constant light output electronic ballast","authors":"Debadyuti Banerjee, S. Mazumdar, A. K. Sur","doi":"10.1109/ICPEN.2012.6492331","DOIUrl":"https://doi.org/10.1109/ICPEN.2012.6492331","url":null,"abstract":"This paper presents the design and performance of an electronic ballast which provides a constant light output for wide input voltage fluctuations from 85V to 265V. Two IC's have been used in the design: the first part has a PFC controller IC and the second part IC is a ballast driver. The PFC circuit produces and maintains a constant power factor and a constant voltage of 400 V. The second part, the ballast driver IC feeds voltage to a resonant half bridge inverter operating in Zero Voltage Switching (ZVS) resonant mode, thereby reducing switching losses and the electromagnetic interference. The output to this part is constant light for the specified voltage range. Experimental results of the electronic ballast driving 36W fluorescent lamps are presented in order to confirm the feasibility of the performed design methodology.","PeriodicalId":336723,"journal":{"name":"2012 1st International Conference on Power and Energy in NERIST (ICPEN)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126880690","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 : 2012-12-01DOI: 10.1109/ICPEN.2012.6492346
F. Ahmed, D. Saikia, S. Chatterjee, Himani Singh, Priyanandini Das, K. Kalita
A switched reluctance motor is a variable speed motor in which switching of current results in the production of torque and power. Due to the doubly salient structure of switched reluctance motor high acoustic noises and vibrations are produced along with torque ripple. In order to overcome these hindrances bearing-less switched reluctance motor was introduced as a solution to this problem. The motoring action of a switched reluctance motor can be combined with a magnetic bearing action to get a single unit called self-bearing switched reluctance motor. It is an electromagnetic device that has the capability of supporting the rotor on its own, generating magnetic forces by the windings on its stator. This paper presents an extensive literature survey on self-bearing switched reluctance motor and its recent developments including its various purposes in industrial applications. Details of its working principle, design methodologies, winding designs, control strategies and some prototype developments have been studied and presented.
{"title":"Self-bearing switched reluctance motor: A review","authors":"F. Ahmed, D. Saikia, S. Chatterjee, Himani Singh, Priyanandini Das, K. Kalita","doi":"10.1109/ICPEN.2012.6492346","DOIUrl":"https://doi.org/10.1109/ICPEN.2012.6492346","url":null,"abstract":"A switched reluctance motor is a variable speed motor in which switching of current results in the production of torque and power. Due to the doubly salient structure of switched reluctance motor high acoustic noises and vibrations are produced along with torque ripple. In order to overcome these hindrances bearing-less switched reluctance motor was introduced as a solution to this problem. The motoring action of a switched reluctance motor can be combined with a magnetic bearing action to get a single unit called self-bearing switched reluctance motor. It is an electromagnetic device that has the capability of supporting the rotor on its own, generating magnetic forces by the windings on its stator. This paper presents an extensive literature survey on self-bearing switched reluctance motor and its recent developments including its various purposes in industrial applications. Details of its working principle, design methodologies, winding designs, control strategies and some prototype developments have been studied and presented.","PeriodicalId":336723,"journal":{"name":"2012 1st International Conference on Power and Energy in NERIST (ICPEN)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126896721","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 : 2012-12-01DOI: 10.1109/ICPEN.2012.6492343
A. Baral, A. Lahiri
Lightning impulse test is one of the mandatory tests that every transformer has to undergo after assembly. This is done for assessing the condition of insulation of its windings. In the case of any fault, the neutral current and/or tank current contain(s) typical signatures depending on the nature and location of the fault. Since these current signals are non-stationary in nature hence each of these faults can be classified from such a transformation technique that has the time-frequency localization property. This paper investigates the performance of Stockwell Transform, popularly known as S-transform, for identification of insulation failures of a transformer winding during impulse test. The present study is restricted only to identify failure of winding insulation due to some defects that are already present in the winding and have not been developed due to the application or during the propagation of impulse voltage applied during the test. The results presented in this paper are for simulated models of a 3 MVA and a 5 MVA transformer. From the results, the prospect of S-transform in identifying the nature and the location of winding faults in distribution transformers is reflected.
{"title":"Applicability of Stockwell transform in diagnosing impulse faults of a transformer","authors":"A. Baral, A. Lahiri","doi":"10.1109/ICPEN.2012.6492343","DOIUrl":"https://doi.org/10.1109/ICPEN.2012.6492343","url":null,"abstract":"Lightning impulse test is one of the mandatory tests that every transformer has to undergo after assembly. This is done for assessing the condition of insulation of its windings. In the case of any fault, the neutral current and/or tank current contain(s) typical signatures depending on the nature and location of the fault. Since these current signals are non-stationary in nature hence each of these faults can be classified from such a transformation technique that has the time-frequency localization property. This paper investigates the performance of Stockwell Transform, popularly known as S-transform, for identification of insulation failures of a transformer winding during impulse test. The present study is restricted only to identify failure of winding insulation due to some defects that are already present in the winding and have not been developed due to the application or during the propagation of impulse voltage applied during the test. The results presented in this paper are for simulated models of a 3 MVA and a 5 MVA transformer. From the results, the prospect of S-transform in identifying the nature and the location of winding faults in distribution transformers is reflected.","PeriodicalId":336723,"journal":{"name":"2012 1st International Conference on Power and Energy in NERIST (ICPEN)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128200704","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 : 2012-12-01DOI: 10.1109/ICPEN.2012.6492317
S. K. Ojha, P. Purkait, Sivaji Chakravorti
Moisture present in oil and paper insulation is extremely damaging for healthy operation of a transformer. Moisture not only reduces electrical, chemical, mechanical and dielectric strength of the insulation, it also accelerates the insulation ageing process, thereby reducing its effective remaining life. It is thus of high interest for the utilities to have accurate quantitative estimates of moisture content in oil and cellulose insulation of a transformer. Oil moisture can be measured by chemical analysis of oil samples collected from running transformer. On the other hand, collecting paper sample for moisture measurement being extremely difficult, moisture content in paper are normally estimated from measured oil moisture values using certain mathematical equations, or equilibrium charts or recently, from dielectric response measurements. Such estimation of paper moisture content from measured values of oil moisture is largely dependent on the equilibrium status of moisture in the oil-paper insulation assembly. This equilibrium process is highly temperature dependent and thus poses serious accuracy issues in moisture estimation procedures. The present contribution reports results of experiments performed on the oil-paper insulation structure of a model transformer. Operating temperatures have been varied over a range of 40°C to 80°C to study the effects of moisture equilibrium process on measurement of oil moisture and estimate of paper moisture there from. Dielectric response analysis using polarization and depolarization currents (PDC) measurement have been used to further study the effects of moisture equilibrium at different temperatures. A comparative analysis of oil and paper moisture estimates using chemical tests, mathematical formulae, equilibrium charts and dielectric response measurements have also been reported in this article.
{"title":"Understanding the effects of moisture equlibrium process on dielectric response measurements for transformer oil-paper insulation systems","authors":"S. K. Ojha, P. Purkait, Sivaji Chakravorti","doi":"10.1109/ICPEN.2012.6492317","DOIUrl":"https://doi.org/10.1109/ICPEN.2012.6492317","url":null,"abstract":"Moisture present in oil and paper insulation is extremely damaging for healthy operation of a transformer. Moisture not only reduces electrical, chemical, mechanical and dielectric strength of the insulation, it also accelerates the insulation ageing process, thereby reducing its effective remaining life. It is thus of high interest for the utilities to have accurate quantitative estimates of moisture content in oil and cellulose insulation of a transformer. Oil moisture can be measured by chemical analysis of oil samples collected from running transformer. On the other hand, collecting paper sample for moisture measurement being extremely difficult, moisture content in paper are normally estimated from measured oil moisture values using certain mathematical equations, or equilibrium charts or recently, from dielectric response measurements. Such estimation of paper moisture content from measured values of oil moisture is largely dependent on the equilibrium status of moisture in the oil-paper insulation assembly. This equilibrium process is highly temperature dependent and thus poses serious accuracy issues in moisture estimation procedures. The present contribution reports results of experiments performed on the oil-paper insulation structure of a model transformer. Operating temperatures have been varied over a range of 40°C to 80°C to study the effects of moisture equilibrium process on measurement of oil moisture and estimate of paper moisture there from. Dielectric response analysis using polarization and depolarization currents (PDC) measurement have been used to further study the effects of moisture equilibrium at different temperatures. A comparative analysis of oil and paper moisture estimates using chemical tests, mathematical formulae, equilibrium charts and dielectric response measurements have also been reported in this article.","PeriodicalId":336723,"journal":{"name":"2012 1st International Conference on Power and Energy in NERIST (ICPEN)","volume":"513 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134292205","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 : 2012-12-01DOI: 10.1109/ICPEN.2012.6492321
Bajarangbali, S. Majhi
In this paper an on-line identification of two input two output (TITO) system using describing functions (DF) of relays with hysteresis is presented. In relay based system identification, describing function is widely adopted because of the ease of computation involved and general usefulness of the method. Measurement noise is an important issue in an identification problem. During the relay feedback experiments, amplitude of the limit cycle output is often corrupted with noises which may even fail the test. To overcome the possible failure, a relay with hysteresis is considered in the proposed identification method. The identification method developed for a second order plus time delay (SOPDT) system is extended for the TITO system. Simulation examples are included to illustrate usefulness of the proposed method for on-line identification of TITO systems.
{"title":"TITO system identification using relay with hysteresis","authors":"Bajarangbali, S. Majhi","doi":"10.1109/ICPEN.2012.6492321","DOIUrl":"https://doi.org/10.1109/ICPEN.2012.6492321","url":null,"abstract":"In this paper an on-line identification of two input two output (TITO) system using describing functions (DF) of relays with hysteresis is presented. In relay based system identification, describing function is widely adopted because of the ease of computation involved and general usefulness of the method. Measurement noise is an important issue in an identification problem. During the relay feedback experiments, amplitude of the limit cycle output is often corrupted with noises which may even fail the test. To overcome the possible failure, a relay with hysteresis is considered in the proposed identification method. The identification method developed for a second order plus time delay (SOPDT) system is extended for the TITO system. Simulation examples are included to illustrate usefulness of the proposed method for on-line identification of TITO systems.","PeriodicalId":336723,"journal":{"name":"2012 1st International Conference on Power and Energy in NERIST (ICPEN)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134513367","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 : 2012-12-01DOI: 10.1109/ICPEN.2012.6492312
L. Singh, T. Karlo, A. Pandey
Pomegranate dye has been used as green energy material in the fabrication of Dye sensitized solar cells (DSSCs) using nanocrystalline TiO2. Platinum was used as counter electrode. UV-vis, photoluminescence and FTIR studies of the dye as well as UV-vis on dye sensitized TiO2 films were carried out. Photovoltaic parameters like short circuit current (ISC), open circuit voltage (VOC) and fill factor (FF) were evaluated for fabricated cells. The maximum efficiency for the cell was found to be 1.1%. The maximum value of JSC and VOC was found to be 1.31mA/cm2 and 480 mV, respectively, which is quite high as compared to the earlier reported values on pomegranate dyes [1].
{"title":"Pomegranate dye as a green energy material","authors":"L. Singh, T. Karlo, A. Pandey","doi":"10.1109/ICPEN.2012.6492312","DOIUrl":"https://doi.org/10.1109/ICPEN.2012.6492312","url":null,"abstract":"Pomegranate dye has been used as green energy material in the fabrication of Dye sensitized solar cells (DSSCs) using nanocrystalline TiO<inf>2</inf>. Platinum was used as counter electrode. UV-vis, photoluminescence and FTIR studies of the dye as well as UV-vis on dye sensitized TiO<inf>2</inf> films were carried out. Photovoltaic parameters like short circuit current (I<inf>SC</inf>), open circuit voltage (V<inf>OC</inf>) and fill factor (FF) were evaluated for fabricated cells. The maximum efficiency for the cell was found to be 1.1%. The maximum value of J<inf>SC</inf> and V<inf>OC</inf> was found to be 1.31mA/cm<sup>2</sup> and 480 mV, respectively, which is quite high as compared to the earlier reported values on pomegranate dyes [1].","PeriodicalId":336723,"journal":{"name":"2012 1st International Conference on Power and Energy in NERIST (ICPEN)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115256659","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：