Pub Date : 2015-07-26DOI: 10.1109/PESGM.2015.7286096
Y. Kieffel, François Biquez
Alternative solutions to SF6 have been researched for a long time. Up to now, no significant success has been achieved in solutions for the transmission network. This paper presents the research conducted with fluorinated compounds to qualify a new gas to be used into high voltage equipment as SF6 alternatives with properties significantly improved with respect to typical SF6/N2 mixtures or others already in use. Potential applications of SF6-free gas mixture, called g3 and based on 3M™ NovecTM 4710 Dielectric Fluid for dielectric insulation and arc switching into high voltage apparatuses are reported with the aim to be low in toxicity and to reduce the global warming potential of the new mixture to typically less than 2% of the SF6 equivalent with no or minor design modification with respect to typical SF6 design. Research in progress on arc interrupting capability of this new gas mixture has shown promising results that are not described in this publication.
{"title":"SF6 alternative development for high voltage switchgears","authors":"Y. Kieffel, François Biquez","doi":"10.1109/PESGM.2015.7286096","DOIUrl":"https://doi.org/10.1109/PESGM.2015.7286096","url":null,"abstract":"Alternative solutions to SF6 have been researched for a long time. Up to now, no significant success has been achieved in solutions for the transmission network. This paper presents the research conducted with fluorinated compounds to qualify a new gas to be used into high voltage equipment as SF6 alternatives with properties significantly improved with respect to typical SF6/N2 mixtures or others already in use. Potential applications of SF6-free gas mixture, called g3 and based on 3M™ NovecTM 4710 Dielectric Fluid for dielectric insulation and arc switching into high voltage apparatuses are reported with the aim to be low in toxicity and to reduce the global warming potential of the new mixture to typically less than 2% of the SF6 equivalent with no or minor design modification with respect to typical SF6 design. Research in progress on arc interrupting capability of this new gas mixture has shown promising results that are not described in this publication.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129795172","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}
A simulation study at Ka-band window frequency at 35 GHz has been carried out to analyse and explore the DC and high frequency properties of cubic polytypic wide band gap semiconductor DDR impatts based on 3C-SiC and ZnB-GaN. The chosen structure is a flat profile p+pnn+ DDR impatt which is optimised at a particular bias current density with respect to efficiency and output power including the effect of mobile space charge. The results obtained for the above impatts are compared with those of silicon counterpart. The simulated results obtained are very encouraging and suggest the strong potentiality of impatts based on cubic wide band gap semiconductors. The DC-to-millimetre wave conversion efficiency for cubic 3C-SiC impatt is 18.3% with an estimated output power of 34.17 W at an optimised bias current density of 2×108 A/m2. The conversion efficiency and estimated output power in case of cubic ZnB-GaN impatt is 50% and 2.83 W respectively at an optimum bias current density of 3.2×109 A/m2. Both the results are superior in comparison to the silicon counterpart for which the conversion efficiency and estimated output power at an optimum bias current density of 2.5×108 A/m2 are 10.1% and 2.53 W respectively. The design results presented in this paper will be very helpful to realise experimentally impatts based on cubic wide band gap semiconductors and explore their potential as a powerful millimetre wave source.
{"title":"The Ka-band based study on the optimised bias current density performance of cubic wide band gap semiconductor impatts and its comparison with silicon counterpart","authors":"Soumen Banerjee, Piyali Mukherjee, Subhodeep Mukherjee, Shruti Sinha","doi":"10.1109/EIC.2015.7230744","DOIUrl":"https://doi.org/10.1109/EIC.2015.7230744","url":null,"abstract":"A simulation study at Ka-band window frequency at 35 GHz has been carried out to analyse and explore the DC and high frequency properties of cubic polytypic wide band gap semiconductor DDR impatts based on 3C-SiC and ZnB-GaN. The chosen structure is a flat profile p+pnn+ DDR impatt which is optimised at a particular bias current density with respect to efficiency and output power including the effect of mobile space charge. The results obtained for the above impatts are compared with those of silicon counterpart. The simulated results obtained are very encouraging and suggest the strong potentiality of impatts based on cubic wide band gap semiconductors. The DC-to-millimetre wave conversion efficiency for cubic 3C-SiC impatt is 18.3% with an estimated output power of 34.17 W at an optimised bias current density of 2×108 A/m2. The conversion efficiency and estimated output power in case of cubic ZnB-GaN impatt is 50% and 2.83 W respectively at an optimum bias current density of 3.2×109 A/m2. Both the results are superior in comparison to the silicon counterpart for which the conversion efficiency and estimated output power at an optimum bias current density of 2.5×108 A/m2 are 10.1% and 2.53 W respectively. The design results presented in this paper will be very helpful to realise experimentally impatts based on cubic wide band gap semiconductors and explore their potential as a powerful millimetre wave source.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128564059","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 : 2015-06-01DOI: 10.1109/EIC.2015.7230722
Pankaj S. Hage, S. Pokle, Venkateshwarlu Y. Gudur
In the world of social media video processing is very popular. Videos and movies are made up of a temporal sequence of frames and are projected at a proper rate (24 fps for movie and 30 fps for TV) to create the illusion of motion. This means that there exists a high correlation between adjacent temporal frames so that when projected at a proper rate, smooth motion is seen. In different research areas, there is a need for recording events in high frame rates. Due to the high frame rate video constraints, using complex methods are not suitable for videos and will increase the cost of the system and the required storage is also large. Either we have to store the data in database or to transfer video over some communication medium, video size always effect the efficiency. Because of this video compression is required to save the storage space. There are different lossless, lossy and wavelet methods for compressing video sequences. This paper presents the architectures for 2D discrete wavelet transform (DWT) and inverse DWT (IDWT). The experimental results demonstrate good compression ratios, mean square error and peak signal to noise ratio.
{"title":"Discrete wavelet transform based video signal processing","authors":"Pankaj S. Hage, S. Pokle, Venkateshwarlu Y. Gudur","doi":"10.1109/EIC.2015.7230722","DOIUrl":"https://doi.org/10.1109/EIC.2015.7230722","url":null,"abstract":"In the world of social media video processing is very popular. Videos and movies are made up of a temporal sequence of frames and are projected at a proper rate (24 fps for movie and 30 fps for TV) to create the illusion of motion. This means that there exists a high correlation between adjacent temporal frames so that when projected at a proper rate, smooth motion is seen. In different research areas, there is a need for recording events in high frame rates. Due to the high frame rate video constraints, using complex methods are not suitable for videos and will increase the cost of the system and the required storage is also large. Either we have to store the data in database or to transfer video over some communication medium, video size always effect the efficiency. Because of this video compression is required to save the storage space. There are different lossless, lossy and wavelet methods for compressing video sequences. This paper presents the architectures for 2D discrete wavelet transform (DWT) and inverse DWT (IDWT). The experimental results demonstrate good compression ratios, mean square error and peak signal to noise ratio.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128747981","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 : 2015-06-01DOI: 10.1109/EIC.2015.7230739
Poonam Nikam, Mithra Venkatesan, A. Kulkarni
In today's engineering challenge intelligence is required to keep up with the rapid evolution of wireless communications, specifically managing and allocating the scarce, radio spectrum in the highly varying and disparate modern environments. The cognitive engine derives and enforces decisions to the software-based radio by constantly adjusting its parameters, observing and measuring the outcomes and taking actions to move the radio toward some desired operational state within the cognition cycle. For such a process, learning mechanisms which are capable of exploiting measurements are sensed from the environment, gathered experience and stored knowledge, are assessed for taking decisions and actions. A cognitive Radio system assures to handle this situation by utilizing intelligent software packages that enrich their transceiver with radio-awareness, capability and adaptability to learn. This paper introduces and assesses learning schemes which are based on artificial neural networks and can be used for predicting the capabilities (e.g. throughput) which can be achieved by a specific radio configuration.
{"title":"Throughput prediction in cognitive Radio using Adaptive Neural Fuzzy Inference System","authors":"Poonam Nikam, Mithra Venkatesan, A. Kulkarni","doi":"10.1109/EIC.2015.7230739","DOIUrl":"https://doi.org/10.1109/EIC.2015.7230739","url":null,"abstract":"In today's engineering challenge intelligence is required to keep up with the rapid evolution of wireless communications, specifically managing and allocating the scarce, radio spectrum in the highly varying and disparate modern environments. The cognitive engine derives and enforces decisions to the software-based radio by constantly adjusting its parameters, observing and measuring the outcomes and taking actions to move the radio toward some desired operational state within the cognition cycle. For such a process, learning mechanisms which are capable of exploiting measurements are sensed from the environment, gathered experience and stored knowledge, are assessed for taking decisions and actions. A cognitive Radio system assures to handle this situation by utilizing intelligent software packages that enrich their transceiver with radio-awareness, capability and adaptability to learn. This paper introduces and assesses learning schemes which are based on artificial neural networks and can be used for predicting the capabilities (e.g. throughput) which can be achieved by a specific radio configuration.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130996661","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 : 2015-06-01DOI: 10.1109/EIC.2015.7230721
P. Mahajan, S. Madhe
Nowadays thyroid gland disorder is very common disease. More than one third of all women may be found to have at least one thyroid nodule disorder during their lifetime. Thyroid detection test is usually done by invasive and non-invasive methods. Invasive methods like Thyroid Function Tests(TFTs), biopsy are traumatic methods and non-invasive methods like ultrasound and x-rays should not be used many time. TFT is a collective term for blood tests used to check the function of the thyroid. This is invasive method to detect thyroid gland disease. TFTs may be requested if a patient is thought to suffer from hyperthyroidism or hypothyroidism. This paper gives the state of the art of image processing techniques to detect the thyroid gland disease non- traumatically using Thermograph. Thermographs are the images taken by Thermal Imaging. Thermal Imaging is a technology that creates and analyses image by detecting the heat radiating from an object. We have proposed a system to detect the thyroid gland disease using thermograph. A hyperactive thyroid gland is a center of increased blood flow and chemical activity, so it is a center of heat production that can be detected by thermal sensing. Temperature can be sensed using thermal camera FLIRE30 with thermal sensitivity of 0.1°C with temperature range -20°C to +120°C. The images of the patients neck is captured by using thermal camera FLIR-E30. These images are filtered by using median filter, and enhanced by histogram equalization. The segmentation of the images is done done using Otsus Thresholding technique to extract the thyroid region from the image. Features are then extracted and thyroid images are classified in hypo and hyperthyroid using Bayesian Classifier.
{"title":"Hypo and hyperthyroid disorder detection from thermal images using Bayesian Classifier","authors":"P. Mahajan, S. Madhe","doi":"10.1109/EIC.2015.7230721","DOIUrl":"https://doi.org/10.1109/EIC.2015.7230721","url":null,"abstract":"Nowadays thyroid gland disorder is very common disease. More than one third of all women may be found to have at least one thyroid nodule disorder during their lifetime. Thyroid detection test is usually done by invasive and non-invasive methods. Invasive methods like Thyroid Function Tests(TFTs), biopsy are traumatic methods and non-invasive methods like ultrasound and x-rays should not be used many time. TFT is a collective term for blood tests used to check the function of the thyroid. This is invasive method to detect thyroid gland disease. TFTs may be requested if a patient is thought to suffer from hyperthyroidism or hypothyroidism. This paper gives the state of the art of image processing techniques to detect the thyroid gland disease non- traumatically using Thermograph. Thermographs are the images taken by Thermal Imaging. Thermal Imaging is a technology that creates and analyses image by detecting the heat radiating from an object. We have proposed a system to detect the thyroid gland disease using thermograph. A hyperactive thyroid gland is a center of increased blood flow and chemical activity, so it is a center of heat production that can be detected by thermal sensing. Temperature can be sensed using thermal camera FLIRE30 with thermal sensitivity of 0.1°C with temperature range -20°C to +120°C. The images of the patients neck is captured by using thermal camera FLIR-E30. These images are filtered by using median filter, and enhanced by histogram equalization. The segmentation of the images is done done using Otsus Thresholding technique to extract the thyroid region from the image. Features are then extracted and thyroid images are classified in hypo and hyperthyroid using Bayesian Classifier.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124980172","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223515
I. Hosier, M. Praeger, A. Vaughan, S. Swingler
Four polyethylene based nano-composites containing either silica or silicon nitride were prepared. After verifying their compositions and morphologies, their dielectric properties were followed as a function of conditioning (absorbed water content). The dielectric loss and DC breakdown strength were found to be strongly dependent on conditioning whilst the properties of a control sample (with no nano-filler) were found to be invariant. Under ambient conditions, silicon nitride provides a composite with reduced dielectric loss and increased breakdown strength compared to an analogous system employing silica. Silicon nitride based systems exhibit improved breakdown strength relative to the host polymer when dried and therefore hold significant potential for use in future HVDC cables.
{"title":"Electrical properties of polymer nano-composites based on oxide and nitride fillers","authors":"I. Hosier, M. Praeger, A. Vaughan, S. Swingler","doi":"10.1109/ICACACT.2014.7223515","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223515","url":null,"abstract":"Four polyethylene based nano-composites containing either silica or silicon nitride were prepared. After verifying their compositions and morphologies, their dielectric properties were followed as a function of conditioning (absorbed water content). The dielectric loss and DC breakdown strength were found to be strongly dependent on conditioning whilst the properties of a control sample (with no nano-filler) were found to be invariant. Under ambient conditions, silicon nitride provides a composite with reduced dielectric loss and increased breakdown strength compared to an analogous system employing silica. Silicon nitride based systems exhibit improved breakdown strength relative to the host polymer when dried and therefore hold significant potential for use in future HVDC cables.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"316 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121112537","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223578
R. Sellick, M. Agamy, L. Hao, KR Weeber
GE Global Research center has developed a system topology that has been validated experimentally by constructing hardware prototypes, to combine the HVDC breaker and transformer functions in a single system. This is implemented with a resonant converter at high frequency to minimize physical footprint, and to maximize efficiency.
{"title":"A high-speed HVDC breaker topology with integral voltage-changing capability","authors":"R. Sellick, M. Agamy, L. Hao, KR Weeber","doi":"10.1109/ICACACT.2014.7223578","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223578","url":null,"abstract":"GE Global Research center has developed a system topology that has been validated experimentally by constructing hardware prototypes, to combine the HVDC breaker and transformer functions in a single system. This is implemented with a resonant converter at high frequency to minimize physical footprint, and to maximize efficiency.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127107803","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223611
Ana L. Vivas-Barber, Rohitha Dhara, M. A. Rab, P. Basappa, Sunmi Lee
In this work, an attempt has been made to model the relationship between the amplitude of a 60Hz voltage applied in a step fashion to a rod-plane Gap with a dielectric barrier (a nanofilled polypropylene film affixed to ground plane) and the resulting partial discharge quantities. The applied voltage sampled at discrete time intervals is considered as input and corresponding partial discharges sampled at equispaced times as output resulting in a bivariate stochastic process. The main field is controlled by a programmable logic controller programmed autotransformer and the PD behavior is dependent on the combined effect of variations in main field and the field due to residual charges from earlier partial discharges. The experimental results are analyzed through a transfer function model. The details of the steps involved in the modeling process are discussed and results are presented.
{"title":"Transfer function modeling of partial discharge behavior evolved during application of a time varying power frequency voltage","authors":"Ana L. Vivas-Barber, Rohitha Dhara, M. A. Rab, P. Basappa, Sunmi Lee","doi":"10.1109/ICACACT.2014.7223611","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223611","url":null,"abstract":"In this work, an attempt has been made to model the relationship between the amplitude of a 60Hz voltage applied in a step fashion to a rod-plane Gap with a dielectric barrier (a nanofilled polypropylene film affixed to ground plane) and the resulting partial discharge quantities. The applied voltage sampled at discrete time intervals is considered as input and corresponding partial discharges sampled at equispaced times as output resulting in a bivariate stochastic process. The main field is controlled by a programmable logic controller programmed autotransformer and the PD behavior is dependent on the combined effect of variations in main field and the field due to residual charges from earlier partial discharges. The experimental results are analyzed through a transfer function model. The details of the steps involved in the modeling process are discussed and results are presented.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117316835","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223543
V. Peesapati, R. Gardner, R. Lowndes, I. Cotton, B. Twomey, L. Dunsby, R. Balcombe
Premature failures of stator insulation account for a large percentage of repairs of marine generator systems. The failure mechanisms of such faults have been presented in many parts of the literature. Partial discharge activity, thermal degradation, thermal cycling, harmonics and transients are some examples of such failure mechanisms. Whilst there has been an insight into the failure mechanisms, there is still no definite answer to how these defects manifest in the first place. Most of the failures that have been identified within literature are on end windings, especially slot ends. Some failure mechanisms have also been linked with thermal cycling. Frequent and rigorous stop/start cycles stress coils by inducing mechanical forces between elements of the coil and housing owing to differential thermal expansion. This differential expansion is dependent on the rate of rise of temperature and also the different coefficients of thermal expansion of the materials. The present paper will evaluate the thermal degradation of insulation systems used on marine generators using Finite Element Analysis (FEA) methods. On board temperature measurements of stator coils during a high speed run are used as one of the parameters within the FEA simulations, to investigate if there is any risk of differential thermal expansions during such an operational cycle. Different ramp rates are also analyzed within the FEA simulations to understand the effect of uneven thermal expansions and the risk of material degradation of the insulation in coils on marine systems. A brief review of the standards available for thermal cycling and testing are also presented within the paper.
{"title":"Impact of thermal cycling on high voltage coils used in marine generators using FEA methods","authors":"V. Peesapati, R. Gardner, R. Lowndes, I. Cotton, B. Twomey, L. Dunsby, R. Balcombe","doi":"10.1109/ICACACT.2014.7223543","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223543","url":null,"abstract":"Premature failures of stator insulation account for a large percentage of repairs of marine generator systems. The failure mechanisms of such faults have been presented in many parts of the literature. Partial discharge activity, thermal degradation, thermal cycling, harmonics and transients are some examples of such failure mechanisms. Whilst there has been an insight into the failure mechanisms, there is still no definite answer to how these defects manifest in the first place. Most of the failures that have been identified within literature are on end windings, especially slot ends. Some failure mechanisms have also been linked with thermal cycling. Frequent and rigorous stop/start cycles stress coils by inducing mechanical forces between elements of the coil and housing owing to differential thermal expansion. This differential expansion is dependent on the rate of rise of temperature and also the different coefficients of thermal expansion of the materials. The present paper will evaluate the thermal degradation of insulation systems used on marine generators using Finite Element Analysis (FEA) methods. On board temperature measurements of stator coils during a high speed run are used as one of the parameters within the FEA simulations, to investigate if there is any risk of differential thermal expansions during such an operational cycle. Different ramp rates are also analyzed within the FEA simulations to understand the effect of uneven thermal expansions and the risk of material degradation of the insulation in coils on marine systems. A brief review of the standards available for thermal cycling and testing are also presented within the paper.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123200429","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223506
Yan-hu Jiang, S. McMeekin, A. Reid, A. Nekahi, M. Judd, Alan Wilson
Microwave radiometry is a novel method for monitoring contamination levels on high voltage insulators. The microwave radiometer described measures energy emitted from the contamination layer and could provide a safe, reliable, contactless monitoring method that is effective under dry conditions. The design of the system has focused on optimizing accuracy, stability and sensitivity using a relatively low cost architecture. Experimental results demonstrate that the output from the radiometer is able to clearly distinguish between samples with different contamination levels under dry conditions. This contamination monitoring method could potentially provide advance warning of the future failure of wet insulators in climates where insulators can experience dry conditions for extended periods.
{"title":"Design of a microwave radiometer for monitoring high voltage insulator contamination level","authors":"Yan-hu Jiang, S. McMeekin, A. Reid, A. Nekahi, M. Judd, Alan Wilson","doi":"10.1109/ICACACT.2014.7223506","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223506","url":null,"abstract":"Microwave radiometry is a novel method for monitoring contamination levels on high voltage insulators. The microwave radiometer described measures energy emitted from the contamination layer and could provide a safe, reliable, contactless monitoring method that is effective under dry conditions. The design of the system has focused on optimizing accuracy, stability and sensitivity using a relatively low cost architecture. Experimental results demonstrate that the output from the radiometer is able to clearly distinguish between samples with different contamination levels under dry conditions. This contamination monitoring method could potentially provide advance warning of the future failure of wet insulators in climates where insulators can experience dry conditions for extended periods.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114688717","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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