Pub Date : 2019-06-01DOI: 10.1109/EIC43217.2019.9046599
M. Dhotre, F. Agostini, S. Kotilainen
In high voltage circuit breakers, the arc extinction is achieved by the pressure generated from the arc. The generated pressure is such that it acts against the mechanical operating mechanism used for the contacts separation. This process leads to slower or even reverse movement of the contacts. In the present work, such a contact travel behavior is evaluated using a fully coupled simulation of the arc physics and of the mechanical drive. Furthermore, the design measure and possible optimization of the pressure and drive energy is presented to limit the reverse travel of the contacts.
{"title":"CFD Simulation of a High Voltage Circuit Breaker Coupled with a Mechanical Operating Mechanism","authors":"M. Dhotre, F. Agostini, S. Kotilainen","doi":"10.1109/EIC43217.2019.9046599","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046599","url":null,"abstract":"In high voltage circuit breakers, the arc extinction is achieved by the pressure generated from the arc. The generated pressure is such that it acts against the mechanical operating mechanism used for the contacts separation. This process leads to slower or even reverse movement of the contacts. In the present work, such a contact travel behavior is evaluated using a fully coupled simulation of the arc physics and of the mechanical drive. Furthermore, the design measure and possible optimization of the pressure and drive energy is presented to limit the reverse travel of the contacts.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124797878","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046559
Sérgio Garcia, Richard C. D. Brown, G. Langley, P. Birkin, J. Pilgrim, P. Lewin, G. Wilson
Over recent decades there have been reported failures of oil/paper-based transformers caused by corrosion of copper conductor surfaces and breakdown of insulation. A small number of failures were caused by silver corrosion in tapchangers, promoted by the presence of elemental sulphur at mg/kg levels. The electrical power infrastructure and the entire transformer fleet can be at risk from unexpected failures, so preventive measures are necessary. In this work a rapid analytical technique to monitor elemental sulphur levels « 1 mg/kg) in insulating mineral oil has been developed. The method can be used as a routine test, or to confirm the presence of elemental sulphur in samples where corrosion has occurred. The potential of the method is demonstrated through its application to some real mineral oil samples from transformers.
{"title":"Rapid analytical method for elemental sulphur detection in power transformer insulation","authors":"Sérgio Garcia, Richard C. D. Brown, G. Langley, P. Birkin, J. Pilgrim, P. Lewin, G. Wilson","doi":"10.1109/EIC43217.2019.9046559","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046559","url":null,"abstract":"Over recent decades there have been reported failures of oil/paper-based transformers caused by corrosion of copper conductor surfaces and breakdown of insulation. A small number of failures were caused by silver corrosion in tapchangers, promoted by the presence of elemental sulphur at mg/kg levels. The electrical power infrastructure and the entire transformer fleet can be at risk from unexpected failures, so preventive measures are necessary. In this work a rapid analytical technique to monitor elemental sulphur levels « 1 mg/kg) in insulating mineral oil has been developed. The method can be used as a routine test, or to confirm the presence of elemental sulphur in samples where corrosion has occurred. The potential of the method is demonstrated through its application to some real mineral oil samples from transformers.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131467643","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046540
H. Wilhelm, P. Fernandes, T. K. Pereira, G. C. Santos, Daniel Aroucha Filho, Arley Mar, Marcelo Ribeiro
In order to age thermally upgraded kraft paper immersed in insulating oil without aging the oil, an “aging device” was built in which a copper electric resistance was covered with insulating paper and the setup was immersed in insulating oil contained in a vessel. The oil was water cooled to keep its temperature below 60° C, while paper's temperature was raised up to 500 °C. The experiment allowed the determination of the CO2/CO rate variation against aging time and temperature. The generation of other decomposition products, namely furan compounds, methanol and ethanol was also determined against aging time and temperature. Paper aging status was also determined through degree of polymerization (DP). The aging of oil was also monitored.
{"title":"Laboratory Model for Evaluation of Incipient Transformer Thermal Fault Involving Insulating","authors":"H. Wilhelm, P. Fernandes, T. K. Pereira, G. C. Santos, Daniel Aroucha Filho, Arley Mar, Marcelo Ribeiro","doi":"10.1109/EIC43217.2019.9046540","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046540","url":null,"abstract":"In order to age thermally upgraded kraft paper immersed in insulating oil without aging the oil, an “aging device” was built in which a copper electric resistance was covered with insulating paper and the setup was immersed in insulating oil contained in a vessel. The oil was water cooled to keep its temperature below 60° C, while paper's temperature was raised up to 500 °C. The experiment allowed the determination of the CO2/CO rate variation against aging time and temperature. The generation of other decomposition products, namely furan compounds, methanol and ethanol was also determined against aging time and temperature. Paper aging status was also determined through degree of polymerization (DP). The aging of oil was also monitored.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121043964","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046592
Chengxing Lian, Xu Zhang, Christonher Emersic, R. Lowndes, I. Cotton
The accumulation of ice can lead to serious damage and failure of overhead line systems due to the additional mechanical loads applied during icing events. CIGRE TB361 has detailed a range of advanced superhydrophobic coatings and this paper details the replication and optimisation of the manufacturing procedure to coat overhead line samples with a stearic acid-based coating. The solution was loaded with Silicon Dioxide (SiO2) nanoparticles and achieved a sliding angle of 3° and a contact angle of 169°on aluminium substrates. The paper also describes several ageing tests, including thermal ageing, corona exposure, ultraviolet radiation, and outdoor environmental exposure. Samples were characterised using different techniques such as contact angle measurements and microscopy tests before and after each ageing test. High temperature and corona discharge were shown to have a strong degrading effect on coating's superhydrophobicity. Ultraviolet exposure and outdoor tests changed the wettability performance of samples and led to ‘sticky’ surfaces with high contact angle hysteresis. Tests indicated that the coating has poor performance under difference ageing conditions and is unsuitable for deployment onto overhead power lines.
{"title":"Long-term Durability of Stearic Acid Silicon Dioxide Nanoparticle Superhydrophobic Coating on Aluminium Alloy Overhead Line Conductors","authors":"Chengxing Lian, Xu Zhang, Christonher Emersic, R. Lowndes, I. Cotton","doi":"10.1109/EIC43217.2019.9046592","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046592","url":null,"abstract":"The accumulation of ice can lead to serious damage and failure of overhead line systems due to the additional mechanical loads applied during icing events. CIGRE TB361 has detailed a range of advanced superhydrophobic coatings and this paper details the replication and optimisation of the manufacturing procedure to coat overhead line samples with a stearic acid-based coating. The solution was loaded with Silicon Dioxide (SiO2) nanoparticles and achieved a sliding angle of 3° and a contact angle of 169°on aluminium substrates. The paper also describes several ageing tests, including thermal ageing, corona exposure, ultraviolet radiation, and outdoor environmental exposure. Samples were characterised using different techniques such as contact angle measurements and microscopy tests before and after each ageing test. High temperature and corona discharge were shown to have a strong degrading effect on coating's superhydrophobicity. Ultraviolet exposure and outdoor tests changed the wettability performance of samples and led to ‘sticky’ surfaces with high contact angle hysteresis. Tests indicated that the coating has poor performance under difference ageing conditions and is unsuitable for deployment onto overhead power lines.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115080081","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046549
Nageshwar Rao Burjupati, D. K. Puhan, Rajat Sharma
A study was undertaken in the laboratory of CPRI to understand the detection capability of corona/partial discharges in air and oil medium using opto electronic technique. The experimental investigations were carried out in a high pressure test chamber fitted with high voltage bushing, electrode arrangement with a moving seal, view ports, gas inlets and outlets. PD measuring system consisted of ac high voltage test setup, fluorescent optical fiber, normal optical fiber, fiber adaptor, photomultiplier tube and picoscope for detection of discharges by optical method. Simultaneously the discharges were also detected by electrical method using the conventional system consisting of a high voltage ac source, coupling capacitor cum standard capacitive voltage divider, PD detection unit and test cell. The studies were conducted both in air & oil under uniform and non-uniform electric fields using point plane electrode geometry. The electrode gap distance is varied from 5 mm to 30 mm. The response of different colored fluorescent optical fiber was studied. The results are presented and discussed.
{"title":"Opto Electronic Technique for Detection of Corona Discharges in Air and Oil","authors":"Nageshwar Rao Burjupati, D. K. Puhan, Rajat Sharma","doi":"10.1109/EIC43217.2019.9046549","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046549","url":null,"abstract":"A study was undertaken in the laboratory of CPRI to understand the detection capability of corona/partial discharges in air and oil medium using opto electronic technique. The experimental investigations were carried out in a high pressure test chamber fitted with high voltage bushing, electrode arrangement with a moving seal, view ports, gas inlets and outlets. PD measuring system consisted of ac high voltage test setup, fluorescent optical fiber, normal optical fiber, fiber adaptor, photomultiplier tube and picoscope for detection of discharges by optical method. Simultaneously the discharges were also detected by electrical method using the conventional system consisting of a high voltage ac source, coupling capacitor cum standard capacitive voltage divider, PD detection unit and test cell. The studies were conducted both in air & oil under uniform and non-uniform electric fields using point plane electrode geometry. The electrode gap distance is varied from 5 mm to 30 mm. The response of different colored fluorescent optical fiber was studied. The results are presented and discussed.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115080750","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046585
Pengfei Su, Y. Yin, Xinlong Zheng, Yaowei Xuan, Jiandong Wu
Crosslinked polyethylene (XLPE) is the main insulation material in HVDC (high-voltage direct current) flexible cable. DC breakdown characteristics of XLPE are important indicators to determine operational safety. The accumulation of space charge could change the electric field distribution within the cable insulation layer, and could lead to insulation breakdown in severe cases. In response to these problems, this paper investigated on the breakdown strength and space charge characters of XLPE with different thicknesses. DC breakdown experiments were conducted for three different sorts of XLPE at positive and negative electric fields, where the thicknesses of the samples were 100 $mumathbf{m},mathbf{200} mu mathbf{m},mathbf{300} mu mathbf{m}$ and $mathbf{400} mumathbf{m}$. Besides, the space charge measurements were carried out on $mathbf{200} mu mathbf{m}$ and $mathbf{400} mu mathbf{m}$ XLPE samples at 70kV/mm and 80kV/mm. The electric field distortion within the sample was calculated. The results show that the breakdown strength of XLPE decreases as the thickness of the XLPE increases. Power function was applied to describe the relationship between the breakdown strength and thickness. The homo charges injected from anode form packet-like charges which could move towards the cathode at high electric field. For thicker samples, more space charges are accumulated and there is a larger maximum electric field distortion. Therefore, the breakdown strength of thicker samples could be relatively lower than thinner samples.
交联聚乙烯(XLPE)是高压直流软电缆的主要绝缘材料。交联聚乙烯直流击穿特性是确定其运行安全性的重要指标。空间电荷的积累会改变电缆绝缘层内的电场分布，严重时可能导致绝缘击穿。针对这些问题，本文研究了不同厚度XLPE的击穿强度和空间电荷特性。在正负电场下对三种不同类型的XLPE进行直流击穿实验，样品的厚度分别为100 $mumathbf{m}、mathbf{200}、mathbf{300} mumathbf{m}$和$mathbf{400} mumathbf{m}$。此外，在70kV/mm和80kV/mm下，对$mathbf{200} mu mathbf{m}$和$mathbf{400} mu mathbf{m}$ XLPE样品进行了空间电荷测量。计算了样品内部的电场畸变。结果表明:随着XLPE厚度的增加，XLPE的击穿强度降低;采用幂函数来描述击穿强度与厚度之间的关系。从阳极注入的homo电荷形成包状电荷，在高电场作用下向阴极移动。样品越厚，积累的空间电荷越多，最大电场畸变也越大。因此，较厚样品的击穿强度可能相对较薄样品低。
{"title":"Investigation of the Thickness Effect on DC Breakdown Strength for HVDC Flexible Cable Insulation Associated with Space Charge","authors":"Pengfei Su, Y. Yin, Xinlong Zheng, Yaowei Xuan, Jiandong Wu","doi":"10.1109/EIC43217.2019.9046585","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046585","url":null,"abstract":"Crosslinked polyethylene (XLPE) is the main insulation material in HVDC (high-voltage direct current) flexible cable. DC breakdown characteristics of XLPE are important indicators to determine operational safety. The accumulation of space charge could change the electric field distribution within the cable insulation layer, and could lead to insulation breakdown in severe cases. In response to these problems, this paper investigated on the breakdown strength and space charge characters of XLPE with different thicknesses. DC breakdown experiments were conducted for three different sorts of XLPE at positive and negative electric fields, where the thicknesses of the samples were 100 $mumathbf{m},mathbf{200} mu mathbf{m},mathbf{300} mu mathbf{m}$ and $mathbf{400} mumathbf{m}$. Besides, the space charge measurements were carried out on $mathbf{200} mu mathbf{m}$ and $mathbf{400} mu mathbf{m}$ XLPE samples at 70kV/mm and 80kV/mm. The electric field distortion within the sample was calculated. The results show that the breakdown strength of XLPE decreases as the thickness of the XLPE increases. Power function was applied to describe the relationship between the breakdown strength and thickness. The homo charges injected from anode form packet-like charges which could move towards the cathode at high electric field. For thicker samples, more space charges are accumulated and there is a larger maximum electric field distortion. Therefore, the breakdown strength of thicker samples could be relatively lower than thinner samples.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114314685","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046548
L. Lusuardi, A. Rumi, A. Cavallini, Peng Wang, T. Han
For inverter-fed induction motors, preventing partial discharge inception at all possible operating voltages might cause suboptimal power densities. In this paper we investigate the possibility of designing insulation systems that might tolerate partial discharges incepted with a low probability. Such a result would help a more proper and justified application of corona-resistant magnet wires. Rather than providing an ultimate solution to this complex problem, we want to indicate an approach using the theory of cumulative damage and underline the areas where critical information is missing to achieve this target.
{"title":"Can Low Voltage Inverter-Fed Induction Motors Be Designed Allowing Partial Discharge Activity?","authors":"L. Lusuardi, A. Rumi, A. Cavallini, Peng Wang, T. Han","doi":"10.1109/EIC43217.2019.9046548","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046548","url":null,"abstract":"For inverter-fed induction motors, preventing partial discharge inception at all possible operating voltages might cause suboptimal power densities. In this paper we investigate the possibility of designing insulation systems that might tolerate partial discharges incepted with a low probability. Such a result would help a more proper and justified application of corona-resistant magnet wires. Rather than providing an ultimate solution to this complex problem, we want to indicate an approach using the theory of cumulative damage and underline the areas where critical information is missing to achieve this target.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133417324","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046529
Jiayang Wu, P. V. van Nes, A. Rodrigo Mor, J. Smit
This paper investigates the partial discharges (PD) at artificial defects in a cross-linked polyethylene (XLPE) insulated cable joint under superimposed voltage. The experiments are conducted on a 16-meter long 150 kV commercial XLPE cable, together with a cable joint and two terminations. Defects are fabricated on purpose in the cable joint. The cable system was subjected to a 50 Hz AC voltage, being in between PD extinction and inception values, superimposed with a lightning impulse voltage. Partial discharges are measured by two HFCT sensors at the two ends of the cable joint. The measurement results show that, the impulse voltage could trigger partial discharges. The partial discharge occurrence is mainly influenced by the time period during which the applied voltage is higher than PDIV.
{"title":"Partial Discharges in XLPE Insulated Cable under Superimposed Transient Voltages","authors":"Jiayang Wu, P. V. van Nes, A. Rodrigo Mor, J. Smit","doi":"10.1109/EIC43217.2019.9046529","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046529","url":null,"abstract":"This paper investigates the partial discharges (PD) at artificial defects in a cross-linked polyethylene (XLPE) insulated cable joint under superimposed voltage. The experiments are conducted on a 16-meter long 150 kV commercial XLPE cable, together with a cable joint and two terminations. Defects are fabricated on purpose in the cable joint. The cable system was subjected to a 50 Hz AC voltage, being in between PD extinction and inception values, superimposed with a lightning impulse voltage. Partial discharges are measured by two HFCT sensors at the two ends of the cable joint. The measurement results show that, the impulse voltage could trigger partial discharges. The partial discharge occurrence is mainly influenced by the time period during which the applied voltage is higher than PDIV.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"26 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132398327","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046628
A. Gegenava, A. Khazanov, F. Dawson
Corona in high voltage rotating machines (HVRM) is a very common and might be considered an inevitable phenomenon. Corona has various different signatures, causes, severity, and potential hazard for reliable machine operation. The necessity, frequency, and procedure for effective repair are contingent upon proper evaluation of all the issues discussed in this article.
{"title":"Corona in High Voltage Rotating Machines Stator. Causes, Repair and Prognosis","authors":"A. Gegenava, A. Khazanov, F. Dawson","doi":"10.1109/EIC43217.2019.9046628","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046628","url":null,"abstract":"Corona in high voltage rotating machines (HVRM) is a very common and might be considered an inevitable phenomenon. Corona has various different signatures, causes, severity, and potential hazard for reliable machine operation. The necessity, frequency, and procedure for effective repair are contingent upon proper evaluation of all the issues discussed in this article.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"44 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125992987","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 : 2019-06-01DOI: 10.1109/EIC43217.2019.9046622
Alireza Naeini, E. Cherney, S. Jayaram
Simulation studies under pulse voltage using a 2D axisymmetric model in COMSOL® 5.3a on the temperature and electric field along the stress grading system (SGS) of a form wound coil are reported in this work. The validity of the 2D model is shown by comparing the results with the measured temperature profile along the SGS. The effect of the nonlinearity of stress grading tape (SGT) conductivity is evaluated on both temperature and electric field. The results show that increasing the level of the nonlinearity of the SGT conductivity reduces the maximum electric field. On the other hand, the temperature rise is decreased by reducing the level of the nonlinearity of the SGT conductivity. As such, the effect of nonlinearity changes are not mutually compatible in controlling both the electric field and temperature profiles.
{"title":"Temperature and Electric Field under Pulse Voltage along the Stress Grading System of a Form-Wound Coil","authors":"Alireza Naeini, E. Cherney, S. Jayaram","doi":"10.1109/EIC43217.2019.9046622","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046622","url":null,"abstract":"Simulation studies under pulse voltage using a 2D axisymmetric model in COMSOL® 5.3a on the temperature and electric field along the stress grading system (SGS) of a form wound coil are reported in this work. The validity of the 2D model is shown by comparing the results with the measured temperature profile along the SGS. The effect of the nonlinearity of stress grading tape (SGT) conductivity is evaluated on both temperature and electric field. The results show that increasing the level of the nonlinearity of the SGT conductivity reduces the maximum electric field. On the other hand, the temperature rise is decreased by reducing the level of the nonlinearity of the SGT conductivity. As such, the effect of nonlinearity changes are not mutually compatible in controlling both the electric field and temperature profiles.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127948658","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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