Pub Date : 2019-11-01DOI: 10.1109/CATCON47128.2019.CN0091
Ankita Garg, Jeyabalan Velandy
Recently, there is a growing interest in ester oil transformer for fire safety, eco-friendly and continuous over loading capability in comparison to conventionally used mineral oil transformer. The high interest on ester oil transformer has led to several analysis aimed at prediction of their dielectric analysis, thermal analysis and process development. In order to utilize the ester oil as an alternative to mineral oil, the internal and external cooling modes in thermal analysis of transformer needs to be evaluated to get a continuous overloading capability advantageous of ester oil. In this paper, Thermal Hydraulic Network Model (THNM) are effectively used to predict the oil flow distribution and the temperature distribution in 12.5/16MVA, 132/11kV transformer and compared with mineral oil in steady state conditions. The total oil flow rates of mineral oil and ester oil oils are compared with same winding geometry, power loss distribution (resistive losses in the winding conductors, winding eddy loss and stray loss) in a cooling mode. The power losses are calculated using finite element method (FEM) based simulation software and utilized for thermal analysis in THNM model. The oil flow rate within the winding, top oil rise, winding rise, gradient of the winding and hot-spot temperature rise are calculated for both natural ester oil and synthetic ester oil with respect to mineral oil under air natural and air forced cooling modes.
{"title":"Thermal hydraulic network model for prediction of oil and temperature distribution in ester oil transformer under air natural and air forced cooling conditions","authors":"Ankita Garg, Jeyabalan Velandy","doi":"10.1109/CATCON47128.2019.CN0091","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.CN0091","url":null,"abstract":"Recently, there is a growing interest in ester oil transformer for fire safety, eco-friendly and continuous over loading capability in comparison to conventionally used mineral oil transformer. The high interest on ester oil transformer has led to several analysis aimed at prediction of their dielectric analysis, thermal analysis and process development. In order to utilize the ester oil as an alternative to mineral oil, the internal and external cooling modes in thermal analysis of transformer needs to be evaluated to get a continuous overloading capability advantageous of ester oil. In this paper, Thermal Hydraulic Network Model (THNM) are effectively used to predict the oil flow distribution and the temperature distribution in 12.5/16MVA, 132/11kV transformer and compared with mineral oil in steady state conditions. The total oil flow rates of mineral oil and ester oil oils are compared with same winding geometry, power loss distribution (resistive losses in the winding conductors, winding eddy loss and stray loss) in a cooling mode. The power losses are calculated using finite element method (FEM) based simulation software and utilized for thermal analysis in THNM model. The oil flow rate within the winding, top oil rise, winding rise, gradient of the winding and hot-spot temperature rise are calculated for both natural ester oil and synthetic ester oil with respect to mineral oil under air natural and air forced cooling modes.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122081591","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.CN004
Sushmita Sarkar, K. Rao, Jayanth Bhargav, Shrikesh Sheshaprasad, Anirudh Sharma C A
Rooftop PV systems are now becoming ubiquitous with the reduction in costs of PV panels and related technologies. Developing countries like India have undertaken Green Energy Transition to ensure sustainability and energy self-sufficiency. The increase in consumer participation in view of the nation’s goal necessitates technology advancements in condition monitoring of PV systems. As of today, state of art and robust monitoring systems are available and deployed for large solar farms and have proved to increase the operational efficiency of those systems, whereas there are no standard monitoring systems for small-scale installations. This paper presents a survey on Operation and Maintenance (O&M) of PV systems and an IoT based Wireless Sensor Network for PV panel monitoring.
{"title":"IoT Based Wireless Sensor Network (WSN) for Condition Monitoring of Low Power Rooftop PV Panels","authors":"Sushmita Sarkar, K. Rao, Jayanth Bhargav, Shrikesh Sheshaprasad, Anirudh Sharma C A","doi":"10.1109/CATCON47128.2019.CN004","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.CN004","url":null,"abstract":"Rooftop PV systems are now becoming ubiquitous with the reduction in costs of PV panels and related technologies. Developing countries like India have undertaken Green Energy Transition to ensure sustainability and energy self-sufficiency. The increase in consumer participation in view of the nation’s goal necessitates technology advancements in condition monitoring of PV systems. As of today, state of art and robust monitoring systems are available and deployed for large solar farms and have proved to increase the operational efficiency of those systems, whereas there are no standard monitoring systems for small-scale installations. This paper presents a survey on Operation and Maintenance (O&M) of PV systems and an IoT based Wireless Sensor Network for PV panel monitoring.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127657495","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.6253689
Amritesh Bhaskar, A. Subramaniam, Sai Srinivas Manohar, Sanjib Kumar Panda
This work evaluates the search coil as a magnetic sensor to detect transformer winding faults, through leakage flux monitoring. It is expected that the presence of harmonic contents in valve winding of converter transformer will pose challenge, for condition monitoring techniques. Search coil is technically and economically interesting, as they only require minimal instrumentation resources to practically implement them. Finite Element (FE) based converter transformer model has been developed, with search coils which are sensitive to leakage flux. The voltage induced in search coils were compared in frequency domain for various inter-turn faults and a fault diagnostic algorithm has been developed to localize the fault. Winding leakage flux were recorded using the custom designed search coils and analysed, with an emulated inter-turn fault in a 10 kVA lab-scale converter transformer. Method of emulating the inter-turn fault in transformer model, leakage flux distribution along transformer limbs, search coil design, experimental studies and the results for AC and DC loads are all discussed and presented in this report.
{"title":"Search coil based condition monitoring technique for internal faults in converter transformer","authors":"Amritesh Bhaskar, A. Subramaniam, Sai Srinivas Manohar, Sanjib Kumar Panda","doi":"10.1109/CATCON47128.2019.6253689","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.6253689","url":null,"abstract":"This work evaluates the search coil as a magnetic sensor to detect transformer winding faults, through leakage flux monitoring. It is expected that the presence of harmonic contents in valve winding of converter transformer will pose challenge, for condition monitoring techniques. Search coil is technically and economically interesting, as they only require minimal instrumentation resources to practically implement them. Finite Element (FE) based converter transformer model has been developed, with search coils which are sensitive to leakage flux. The voltage induced in search coils were compared in frequency domain for various inter-turn faults and a fault diagnostic algorithm has been developed to localize the fault. Winding leakage flux were recorded using the custom designed search coils and analysed, with an emulated inter-turn fault in a 10 kVA lab-scale converter transformer. Method of emulating the inter-turn fault in transformer model, leakage flux distribution along transformer limbs, search coil design, experimental studies and the results for AC and DC loads are all discussed and presented in this report.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128409632","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 : 2019-11-01DOI: 10.1109/catcon47128.2019.9079361
{"title":"CATCON 2019 Copyright Forms","authors":"","doi":"10.1109/catcon47128.2019.9079361","DOIUrl":"https://doi.org/10.1109/catcon47128.2019.9079361","url":null,"abstract":"","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132386141","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.70
R. Ghosh, P. Seri, G. Montanari
The presence of harsh electromagnetic environments, as those caused by the use of power electronics in industrial assets and renewables, as well as DC in T&D and transport vehicles, will require new approaches to the design and maintenance of electrical insulations. Stresses that were not experienced under conventional, sinusoidal, power supply will most likely affect significantly life and reliability of electrical equipment. This paper looks at type of stresses, life and aging models, diagnostic properties and fast degradations processes which must be considered at the time of insulation design and diagnosed during operating life. A new algorithm for the estimation of a Dynamic Health Index is proposed, and it is shown how much effective it can be when fast-degradation phenomena, as partial discharges, incept in insulation, requiring immediate maintenance action.
{"title":"Condition Assessment of Electrical Equipment in Harsh Electrical Environment","authors":"R. Ghosh, P. Seri, G. Montanari","doi":"10.1109/CATCON47128.2019.70","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.70","url":null,"abstract":"The presence of harsh electromagnetic environments, as those caused by the use of power electronics in industrial assets and renewables, as well as DC in T&D and transport vehicles, will require new approaches to the design and maintenance of electrical insulations. Stresses that were not experienced under conventional, sinusoidal, power supply will most likely affect significantly life and reliability of electrical equipment. This paper looks at type of stresses, life and aging models, diagnostic properties and fast degradations processes which must be considered at the time of insulation design and diagnosed during operating life. A new algorithm for the estimation of a Dynamic Health Index is proposed, and it is shown how much effective it can be when fast-degradation phenomena, as partial discharges, incept in insulation, requiring immediate maintenance action.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132059958","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.CN0069
Priya Selvamany, G. Varadarajan
Over the past few decades, an increasing interest in using polymer in the power distribution cables. Earlier studies shown that cross-linked polyethylene (XLPE) have excellent mechanical and dielectric properties. However, recent publications relate that the judgment of reliability in polymer matrix depend upon the water or electrical trees. The origination and progression of trees in the polymer morphology leads to conjecture role. The tremendous performance of the XLPE insulation materials is mostly dependable on the cleanliness. But the inclusion of impurities in the insulating materials leads to premature aging phenomena and constitutes a foremost concern for the power utilities. This has been studied in the context of presence of contaminants in the insulation and shield region, but studies applicable to contaminants such as silicon, sulphur, selenium and phosphorous have been limited. The results of a study of the polarization behavior in the insulation containing various impurities, using the proposed research techniques of pulse voltage method. This eminent method was convincingly used for the surveillance of XLPE contaminated insulation successfully.
{"title":"Exploration of cross-linked polyethylene material morphological structure and its dielectric properties studied by the effect of pulse voltage","authors":"Priya Selvamany, G. Varadarajan","doi":"10.1109/CATCON47128.2019.CN0069","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.CN0069","url":null,"abstract":"Over the past few decades, an increasing interest in using polymer in the power distribution cables. Earlier studies shown that cross-linked polyethylene (XLPE) have excellent mechanical and dielectric properties. However, recent publications relate that the judgment of reliability in polymer matrix depend upon the water or electrical trees. The origination and progression of trees in the polymer morphology leads to conjecture role. The tremendous performance of the XLPE insulation materials is mostly dependable on the cleanliness. But the inclusion of impurities in the insulating materials leads to premature aging phenomena and constitutes a foremost concern for the power utilities. This has been studied in the context of presence of contaminants in the insulation and shield region, but studies applicable to contaminants such as silicon, sulphur, selenium and phosphorous have been limited. The results of a study of the polarization behavior in the insulation containing various impurities, using the proposed research techniques of pulse voltage method. This eminent method was convincingly used for the surveillance of XLPE contaminated insulation successfully.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133074040","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.CN0039
Pavitra Sharma, Ritika Agarwal, Anjali Uppal, C. Narasimhan, Girish A Morde, Jeyabalan Velandy
Ester oil is becoming increasingly popular as a potential alternative to mineral oil due to eco-friendly, fire safety and higher continuous over loading capability in comparison to conventionally used mineral oil. The high interest on ester oil has led to several studies aimed at prediction of their dielectric breakdown voltage for transformer applications. In this paper, to evaluate the effectiveness of ester oil as a dielectric for transformers the withstand voltages of ester oil under both positive and negative polarities of lightning impulse waveshape in comparison with mineral oil are evaluated for various oil gaps using statistical analysis. In addition, the variation of streamer velocity with various gap distances between electrodes in mineral oil, natural ester oil and synthetic ester oil under different polarity of impulse are extracted to analyze the streamer behavior in ester oil. Finally, the ratios of breakdown voltage, streamer velocity of ester oil with respect to mineral oil are calculated from the experimental results under both positive and negative polarities which serves as a point of reference for insulation design of transformer. Sphere-needle electrode configuration is used to create nonuniform field under lightning impulse stress. The breakdown voltage is determined by multiple level test method and best estimate of 3-parameter Weibull distribution is used for 1% breakdown probability due to breakdown voltage.
{"title":"Lightning impulse polarity effect in ester oils and mineral oil for transformer applications","authors":"Pavitra Sharma, Ritika Agarwal, Anjali Uppal, C. Narasimhan, Girish A Morde, Jeyabalan Velandy","doi":"10.1109/CATCON47128.2019.CN0039","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.CN0039","url":null,"abstract":"Ester oil is becoming increasingly popular as a potential alternative to mineral oil due to eco-friendly, fire safety and higher continuous over loading capability in comparison to conventionally used mineral oil. The high interest on ester oil has led to several studies aimed at prediction of their dielectric breakdown voltage for transformer applications. In this paper, to evaluate the effectiveness of ester oil as a dielectric for transformers the withstand voltages of ester oil under both positive and negative polarities of lightning impulse waveshape in comparison with mineral oil are evaluated for various oil gaps using statistical analysis. In addition, the variation of streamer velocity with various gap distances between electrodes in mineral oil, natural ester oil and synthetic ester oil under different polarity of impulse are extracted to analyze the streamer behavior in ester oil. Finally, the ratios of breakdown voltage, streamer velocity of ester oil with respect to mineral oil are calculated from the experimental results under both positive and negative polarities which serves as a point of reference for insulation design of transformer. Sphere-needle electrode configuration is used to create nonuniform field under lightning impulse stress. The breakdown voltage is determined by multiple level test method and best estimate of 3-parameter Weibull distribution is used for 1% breakdown probability due to breakdown voltage.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133980274","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.CN0034
Brajagopal Datta, S. Chatterjee
Close Proximity Operation of HVAC and HVDC transmission line is the recent trend for increase of power transmission capacity. Need for same is becoming vital day by day due to ever increasing power demand. Erection of HVAC lines has a requirement of high right of way (ROW) as compared to the HVDC lines. Also recent past has witnessed constraint in availability of ROW for many projects of Indian Power Grid. Raise in transmission voltage level of HVDC from Power Grid Corporation of India Limited (PGCIL) and its suitability to decentralized non-conventional grids has led to addition of many upcoming HVDC projects with the already existing ones. So the need of analysis for electric field distribution under this type of hybrid transmission corridor is necessary to meet the standards of engineering design, exposure limits to living beings and environmental protection. The present work shows a two dimensional modelling approach for estimation of hybrid electric field at ground surface with impulse excitation. A practical case of hybrid transmission corridor so formed in Northeast Agra HVDC project of PGCIL has been taken for this case. Effects of both standard and non-standard impulse waveform has been modelled and analysis of its effect on hybrid electric field is presented.
{"title":"Transient Analysis for Hybrid Electric Field in close proximity HVAC-HVDC operation of Northeast – Agra HVDC project","authors":"Brajagopal Datta, S. Chatterjee","doi":"10.1109/CATCON47128.2019.CN0034","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.CN0034","url":null,"abstract":"Close Proximity Operation of HVAC and HVDC transmission line is the recent trend for increase of power transmission capacity. Need for same is becoming vital day by day due to ever increasing power demand. Erection of HVAC lines has a requirement of high right of way (ROW) as compared to the HVDC lines. Also recent past has witnessed constraint in availability of ROW for many projects of Indian Power Grid. Raise in transmission voltage level of HVDC from Power Grid Corporation of India Limited (PGCIL) and its suitability to decentralized non-conventional grids has led to addition of many upcoming HVDC projects with the already existing ones. So the need of analysis for electric field distribution under this type of hybrid transmission corridor is necessary to meet the standards of engineering design, exposure limits to living beings and environmental protection. The present work shows a two dimensional modelling approach for estimation of hybrid electric field at ground surface with impulse excitation. A practical case of hybrid transmission corridor so formed in Northeast Agra HVDC project of PGCIL has been taken for this case. Effects of both standard and non-standard impulse waveform has been modelled and analysis of its effect on hybrid electric field is presented.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127871569","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.CN0058
D. Mishra, R. Verma, A. Baral, N. Haque, S. Chakravorti
De-trapped charge dislodged from interfacial region of oil-paper insulation can be used as an effective insulation sensitive parameter. Over time, various physiochemical reactions takes place at interfacial region and consequently results in the formation of different trap sites (deep and shallow). Charges which resides at these traps sites are de- trapped after gaining sufficient energy. In present analysis, it is found that charge dislocated from deep traps maintains some specific type of relationship with different insulation sensitive parameters. Before using de-trapped (dislodge from deep traps) as an effective insulation sensitive parameter the effect of geometry must be reduced, as amount of de-trapped charge depends on the area of interfacial region which is not identical for all units. Result presented in this paper shows that use of geometric capacitance for normalization purposes significantly reduces the effects of insulation physical dimensions on de- trapped charge. The capability of deep charge (normalized using dc insulation resistance and geometrical capacitance) is also compared in the present work.
{"title":"Estimation of Performance Parameters Using Charge Freed from Deep Traps Located at Interfacial Region of Oil-Paper Insulation","authors":"D. Mishra, R. Verma, A. Baral, N. Haque, S. Chakravorti","doi":"10.1109/CATCON47128.2019.CN0058","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.CN0058","url":null,"abstract":"De-trapped charge dislodged from interfacial region of oil-paper insulation can be used as an effective insulation sensitive parameter. Over time, various physiochemical reactions takes place at interfacial region and consequently results in the formation of different trap sites (deep and shallow). Charges which resides at these traps sites are de- trapped after gaining sufficient energy. In present analysis, it is found that charge dislocated from deep traps maintains some specific type of relationship with different insulation sensitive parameters. Before using de-trapped (dislodge from deep traps) as an effective insulation sensitive parameter the effect of geometry must be reduced, as amount of de-trapped charge depends on the area of interfacial region which is not identical for all units. Result presented in this paper shows that use of geometric capacitance for normalization purposes significantly reduces the effects of insulation physical dimensions on de- trapped charge. The capability of deep charge (normalized using dc insulation resistance and geometrical capacitance) is also compared in the present work.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133908261","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 : 2019-11-01DOI: 10.1109/CATCON47128.2019.CN0081
S. K. Ojha, P. Purkait, B. Chatterjee, S. Chakravorti
Failure of paper insulation is the end of design life of a transformer. Researchers have already stated that paper itself is the storehouse of moisture. Different operating variations over the service life in a transformer initiate degradation and breaking down of cellulosic chain of the paper. Degradation not only weakens the dielectric strength of solid insulation electrically but also produces different carboxylic acids. Organic acids that are produced as by product play a major role in insulation degradation. Among the organic acids produced, low molecular weight acids are found to be absorbed by paper. Over the past few years, attention has been focused to look into the causes of the detrimental effects of insulation ageing, but no such serious efforts have been made to look for the detrimental effects and to understand the influence on insulation ageing due to acid formation. Hence, an attempt has been made to look into the degrading effects caused by the acids by analyzing the dielectric response data obtained in time domain. To understand the physical behavior going on inside the dielectric material due to the influence of acid, time domain data is converted to frequency domain. The frequency domain parameters obtained are used to construct the Cole-Cole diagram to draw conclusions about the condition of ageing status of transformer oil-paper insulation.
{"title":"Influence of Presence of Acids in Transformer Insulation: A study using Cole-Cole Plots","authors":"S. K. Ojha, P. Purkait, B. Chatterjee, S. Chakravorti","doi":"10.1109/CATCON47128.2019.CN0081","DOIUrl":"https://doi.org/10.1109/CATCON47128.2019.CN0081","url":null,"abstract":"Failure of paper insulation is the end of design life of a transformer. Researchers have already stated that paper itself is the storehouse of moisture. Different operating variations over the service life in a transformer initiate degradation and breaking down of cellulosic chain of the paper. Degradation not only weakens the dielectric strength of solid insulation electrically but also produces different carboxylic acids. Organic acids that are produced as by product play a major role in insulation degradation. Among the organic acids produced, low molecular weight acids are found to be absorbed by paper. Over the past few years, attention has been focused to look into the causes of the detrimental effects of insulation ageing, but no such serious efforts have been made to look for the detrimental effects and to understand the influence on insulation ageing due to acid formation. Hence, an attempt has been made to look into the degrading effects caused by the acids by analyzing the dielectric response data obtained in time domain. To understand the physical behavior going on inside the dielectric material due to the influence of acid, time domain data is converted to frequency domain. The frequency domain parameters obtained are used to construct the Cole-Cole diagram to draw conclusions about the condition of ageing status of transformer oil-paper insulation.","PeriodicalId":183797,"journal":{"name":"2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133921448","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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