Pub Date : 2020-06-01DOI: 10.1109/eic47619.2020.9158585
Jiamin Kong, K. Zhou
In the last five decades, a significant effort has been directed to the accurate localization of partial discharge (PD) in power cables, based on the traveling wave measurements. In this paper, a novel and effective method for PD localization, which is based on a totally different technique called time-reversal (TR) method, is presented. This method doesn't need to estimate the time difference of arrival of a PD pulse and its reflection at the far end of the cable. And it takes the frequency-dependent characteristic of phase velocity into account. Firstly, the applicability of the TR technique to localize PD source is discussed. And to validate the feasibility of the new method, the computer simulation of this method has been carried out. Under different cable lengths, signal-noise ratio, quantification error and sampling rates, the location accuracy of the proposed method is discussed. Afterward, the experimental validation of the proposed method is presented. Before experimental test, a 10kV XLPE cable of 498 meters with an artificial defect is used as a test object. During PD detection, two types of PD signals are tested and the PD source is localized by different detection methods. After comparison with other PD localization methods, it is found that the TR technique shows great value and superiority for the localization of PD source in power cable in some ways.
{"title":"A Novel Method for the Localization of Partial Discharge in Power Cables Based on Time Reversal Technique","authors":"Jiamin Kong, K. Zhou","doi":"10.1109/eic47619.2020.9158585","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158585","url":null,"abstract":"In the last five decades, a significant effort has been directed to the accurate localization of partial discharge (PD) in power cables, based on the traveling wave measurements. In this paper, a novel and effective method for PD localization, which is based on a totally different technique called time-reversal (TR) method, is presented. This method doesn't need to estimate the time difference of arrival of a PD pulse and its reflection at the far end of the cable. And it takes the frequency-dependent characteristic of phase velocity into account. Firstly, the applicability of the TR technique to localize PD source is discussed. And to validate the feasibility of the new method, the computer simulation of this method has been carried out. Under different cable lengths, signal-noise ratio, quantification error and sampling rates, the location accuracy of the proposed method is discussed. Afterward, the experimental validation of the proposed method is presented. Before experimental test, a 10kV XLPE cable of 498 meters with an artificial defect is used as a test object. During PD detection, two types of PD signals are tested and the PD source is localized by different detection methods. After comparison with other PD localization methods, it is found that the TR technique shows great value and superiority for the localization of PD source in power cable in some ways.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116642115","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158586
K. Yousefpour, Mojtaba Rostaghi Chalaki, Wenhua Lin, F. Haque, Yeqing Wang, Chanyeop Park
Carbon fiber reinforced polymer matrix (CFRP) composite laminates are increasingly used as structural materials in the aerospace industry owing to their various advantages such as the corrosion resistant property, high specific strength and modulus, high fatigue strength and fatigue damage tolerance, low coefficient of thermal expansion, and light weight. Such an increasing use of CFRP composite laminates raises significant concern over lightning strike impact and necessitates the investigation of their lightning strike damage characteristics. The diameter of an actual lightning arc channel varies from several centimeters to several meters according to reported photographs and ionizing wave analysis. A thorough understanding on the material damage characteristics caused by a lightning strike impact is essential for reducing the lightning strike damage of the composite laminates while maintaining the mechanical properties. There have been numerous studies that investigated the effect of lightning discharges on aircraft composite structures, but the impact of the lightning channel diameter has not been systematically investigated. The goal of this research is to find the correlation between the diameter of electric arcs observed in lightning discharges and the level of damage it causes on CFRP composite laminates.
{"title":"The Impact of Lightning Channel Diameter on the Damage of Carbon Fiber Reinforced Polymer Matrix (CFRP) Composite Laminates","authors":"K. Yousefpour, Mojtaba Rostaghi Chalaki, Wenhua Lin, F. Haque, Yeqing Wang, Chanyeop Park","doi":"10.1109/eic47619.2020.9158586","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158586","url":null,"abstract":"Carbon fiber reinforced polymer matrix (CFRP) composite laminates are increasingly used as structural materials in the aerospace industry owing to their various advantages such as the corrosion resistant property, high specific strength and modulus, high fatigue strength and fatigue damage tolerance, low coefficient of thermal expansion, and light weight. Such an increasing use of CFRP composite laminates raises significant concern over lightning strike impact and necessitates the investigation of their lightning strike damage characteristics. The diameter of an actual lightning arc channel varies from several centimeters to several meters according to reported photographs and ionizing wave analysis. A thorough understanding on the material damage characteristics caused by a lightning strike impact is essential for reducing the lightning strike damage of the composite laminates while maintaining the mechanical properties. There have been numerous studies that investigated the effect of lightning discharges on aircraft composite structures, but the impact of the lightning channel diameter has not been systematically investigated. The goal of this research is to find the correlation between the diameter of electric arcs observed in lightning discharges and the level of damage it causes on CFRP composite laminates.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128701926","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158729
Sadegh Ghanbar, Sedigheh Nazaripour, Marek Kornowski, Keaton Whitaker
Epoxy resin samples were prepared using cycloaliphatic resin and anhydride curing agents. Response Surface Methodology (RSM) was applied to determine the effect of five independent variables (Silbond W12EST, MoldXA400, CSR, PC1000 and BYK3701) at 5 levels on the dependent variables thermal shock crack resistance (TSR) and track resistance. 33 experimental samples were prepared according to experimental design made by RSM. It was observed that not only an increase in the amount of MoldX A400 in the compound improved the tracking, but also amount Silbond W12EST had positive effect on it. The results showed that if the total filler amount in the formulation is lower than 60% the time-to-track is less than 300 min, even with using a high amount of MoldXA400 (30%). Increasing the amount of Silbond W12EST as well as core-shell toughening agent (CSR) microparticles can improve the TSR because of crack propagation inhibition caused by particles. On the other hand, an increase in MoldX A400 deteriorated TSR due to the creating weak bonds with epoxy matrix.
{"title":"Investigation of Track and Thermal Shock Crack Resistance in Outdoor Cycloaliphatic Electrical Insulating Materials Using Response Surface Methodology","authors":"Sadegh Ghanbar, Sedigheh Nazaripour, Marek Kornowski, Keaton Whitaker","doi":"10.1109/eic47619.2020.9158729","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158729","url":null,"abstract":"Epoxy resin samples were prepared using cycloaliphatic resin and anhydride curing agents. Response Surface Methodology (RSM) was applied to determine the effect of five independent variables (Silbond W12EST, MoldXA400, CSR, PC1000 and BYK3701) at 5 levels on the dependent variables thermal shock crack resistance (TSR) and track resistance. 33 experimental samples were prepared according to experimental design made by RSM. It was observed that not only an increase in the amount of MoldX A400 in the compound improved the tracking, but also amount Silbond W12EST had positive effect on it. The results showed that if the total filler amount in the formulation is lower than 60% the time-to-track is less than 300 min, even with using a high amount of MoldXA400 (30%). Increasing the amount of Silbond W12EST as well as core-shell toughening agent (CSR) microparticles can improve the TSR because of crack propagation inhibition caused by particles. On the other hand, an increase in MoldX A400 deteriorated TSR due to the creating weak bonds with epoxy matrix.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129408681","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158756
Mohamadreza Arab Baferani, Tohid Shahsavarian, Chuanyang Li, M. Tefferi, Ivan Jovanović, Yang Cao
In this study, electric field distribution of cable joints under steady state voltage and transient conditions, i.e. lightning impulse and polarity reversal, was investigated using electrothermal simulation. Field grading techniques including geometric grading and geometric grading with field grading materials were considered as the methods to tailor local electric field distribution based on an electro-thermal model of 80kV joint in COMSOL Multiphysics. The results show 6.5 kV/mm and 6.9 kV/mm decrease in amplitude of electric field at the critical point of the interface in presence of FGM under steady state and polarity reversal transient condition, respectively.
{"title":"Electric field tailoring in HVDC cable joints utilizing electro-thermal simulation: effect of field grading materials","authors":"Mohamadreza Arab Baferani, Tohid Shahsavarian, Chuanyang Li, M. Tefferi, Ivan Jovanović, Yang Cao","doi":"10.1109/eic47619.2020.9158756","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158756","url":null,"abstract":"In this study, electric field distribution of cable joints under steady state voltage and transient conditions, i.e. lightning impulse and polarity reversal, was investigated using electrothermal simulation. Field grading techniques including geometric grading and geometric grading with field grading materials were considered as the methods to tailor local electric field distribution based on an electro-thermal model of 80kV joint in COMSOL Multiphysics. The results show 6.5 kV/mm and 6.9 kV/mm decrease in amplitude of electric field at the critical point of the interface in presence of FGM under steady state and polarity reversal transient condition, respectively.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131116866","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158582
Y. Xiaoping, Deng Jieqing, L. Jiansheng, Wu Yiming, Wei Chao, Wang Shengquan, L. Bonan, Chen Yingyu
The insulation failure of current transformers threatens the operation of power grid. Based on the structure characteristics summary of the upright, inverted oil immersion type and SF6 gas insulation type current transformers, the effectiveness of the on-site electrical, chemical, and inspection testing methods is compared. And the influence of the transformer fault on the power grid protection is studied, which is important to current transformer operation and maintenance.
{"title":"Operation characteristics analysis of different structure current transformers","authors":"Y. Xiaoping, Deng Jieqing, L. Jiansheng, Wu Yiming, Wei Chao, Wang Shengquan, L. Bonan, Chen Yingyu","doi":"10.1109/eic47619.2020.9158582","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158582","url":null,"abstract":"The insulation failure of current transformers threatens the operation of power grid. Based on the structure characteristics summary of the upright, inverted oil immersion type and SF6 gas insulation type current transformers, the effectiveness of the on-site electrical, chemical, and inspection testing methods is compared. And the influence of the transformer fault on the power grid protection is studied, which is important to current transformer operation and maintenance.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131141376","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 : 2020-06-01DOI: 10.1109/EIC47619.2020.9158698
C. Staubach, T. Hildinger
Converter feed synchronous generators have some important advantages in pump storage hydro power stations compared to conventional synchronous generators with fixed speed. Due to the converter voltage pulses with large du/dt and high frequency content the winding insulation is electrically and thermally stressed different than for power frequency. As known from MV motors especially the stress grading system is very sensitive regarding these voltage pulse trains. In this feasibility study the electric and thermal stress resulting of the stress grading system is analyzed via a FEM-model. This is done for different for voltage characteristics, i.e. sinusoidal and impulse voltages. The intention is to compare and assess the field strength distribution along the bar surface and the hot-spot temperature in the stress grading layer depending on the voltage signal. Finally, some conclusions and recommendations are given for converter feed windings in hydro-generators.
{"title":"Stress grading system evaluation for a converter feed hydro generator winding","authors":"C. Staubach, T. Hildinger","doi":"10.1109/EIC47619.2020.9158698","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158698","url":null,"abstract":"Converter feed synchronous generators have some important advantages in pump storage hydro power stations compared to conventional synchronous generators with fixed speed. Due to the converter voltage pulses with large du/dt and high frequency content the winding insulation is electrically and thermally stressed different than for power frequency. As known from MV motors especially the stress grading system is very sensitive regarding these voltage pulse trains. In this feasibility study the electric and thermal stress resulting of the stress grading system is analyzed via a FEM-model. This is done for different for voltage characteristics, i.e. sinusoidal and impulse voltages. The intention is to compare and assess the field strength distribution along the bar surface and the hot-spot temperature in the stress grading layer depending on the voltage signal. Finally, some conclusions and recommendations are given for converter feed windings in hydro-generators.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128877867","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158721
Mojtaba Rostaghi Chalaki, K. Yousefpour, Z. Ahmed, Chanyeop Park
Measurement of transient phenomenon such as individual PD pulses requires fast, accurate, and noise-free circuits. The bandwidth of elements used in these circuits can affect the captured PD pulse waveshapes. Transmission lines, which couple the PD sources to data recording devices, are one the most important elements among various components in measurement systems. Therefore, transmission lines with wide bandwidths are necessary in building testbeds that capture individual PD pulses. This paper explains the requirements of an ideal Transmission line design that enables accurate individual PD pulse waveshape measurements. We comprehensively use finite element analysis (FEA) simulation to analyze the impact of PD testbed design on the PD pulse measurement performance. Based on the newly designed testbed with the proposed transmission line design, individual PD measurement performance is examined by the time-domain analysis of the FEA simulation. The results show the effect of transmission line parameters on its frequency responses. Also, the application of a narrow bandwidth transmission line for PD pulse measurement has been confirmed to deform its waveshape. Furthermore, the time-domain results confirmed the impact of transmission lines reflection and losses on captured waveshapes.
{"title":"Transmission Line Design for Individual Partial Discharge Waveshape Measurement","authors":"Mojtaba Rostaghi Chalaki, K. Yousefpour, Z. Ahmed, Chanyeop Park","doi":"10.1109/eic47619.2020.9158721","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158721","url":null,"abstract":"Measurement of transient phenomenon such as individual PD pulses requires fast, accurate, and noise-free circuits. The bandwidth of elements used in these circuits can affect the captured PD pulse waveshapes. Transmission lines, which couple the PD sources to data recording devices, are one the most important elements among various components in measurement systems. Therefore, transmission lines with wide bandwidths are necessary in building testbeds that capture individual PD pulses. This paper explains the requirements of an ideal Transmission line design that enables accurate individual PD pulse waveshape measurements. We comprehensively use finite element analysis (FEA) simulation to analyze the impact of PD testbed design on the PD pulse measurement performance. Based on the newly designed testbed with the proposed transmission line design, individual PD measurement performance is examined by the time-domain analysis of the FEA simulation. The results show the effect of transmission line parameters on its frequency responses. Also, the application of a narrow bandwidth transmission line for PD pulse measurement has been confirmed to deform its waveshape. Furthermore, the time-domain results confirmed the impact of transmission lines reflection and losses on captured waveshapes.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"93 15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126041567","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158700
Jacob R. Houser, A. Hashemian, S. Tyler
Small modular reactors (SMRs) are factory-built transportable nuclear power plants (NPPs) that can generate up to 300 MWe and support new applications for nuclear energy such as hydrogen production, industrial heat generation, and water desalination. SMRs are poised for near-term deployment in the United States and offer improvements over existing NPPs such as passive safety features, greater plant site flexibility, reduced construction costs, load-following operations, and extended refueling cycles. However, in order to realize the benefits of SMRs, there are several challenges related to instrumentation and control (I&C) system components that must be addressed. The I&C systems of an SMR ensure its safe and efficient operation. I&C sensors measure process parameters such as temperature, pressure, level, flow, and neutron flux and provide input to the Reactor Protection System (RPS) to initiate a rapid shutdown if necessary. The performance of these safety-related I&C sensors and systems must be periodically verified to ensure they meet the plant technical specifications for accuracy and response time. In addition, the associated I&C cabling (which includes low-voltage cable assemblies for sensors, Control Rod Drive Mechanisms (CRDMs), and Rod Position Indication (RPI) Systems) is tested as part of normal plant maintenance activities or in support of aging management programs. Over time, exposure to harsh environmental conditions in the plant can result in degradation and failure of I&C sensors and cables. This is especially true for the I&C sensors and cables in SMRs which will be subjected to elevated temperatures, high radiation, and a vacuum atmosphere within the containment vessel during normal plant operation. These conditions lead to excessive Ohmic heating within the cables which further accelerates damage to the cable insulation material and results in premature failure. Frequent cable replacement due to premature degradation is not practical or economical for SMR plant owners. To combat these environmental stressors, the ampacity of the cable must be derated. However, there is limited experience to date with cable derating in vacuum, and no experience with cable derating in vacuum at high temperature and radiation. As a result, Analysis and Measurement Services Corporation (AMS) is conducting a study on several common NPP I&C cables to determine how various insulation materials perform at conditions that emulate those anticipated in the containment of an SMR. The on-going effort is funded under a research and development (R&D) grant awarded to AMS by the U.S. Department of Energy (DOE). In addition, AMS is partnering with the Oak Ridge National Laboratory (ORNL) to conduct specialized testing in support of this study under a separate initiative called the Gateway for Accelerated Innovation in Nuclear (GAIN). The goal of this R&D is to develop technical guidance and technologies to support initial startup and subsequent operation of SMR
{"title":"Derating of Instrument and Control System Cables for Small Modular Reactors","authors":"Jacob R. Houser, A. Hashemian, S. Tyler","doi":"10.1109/eic47619.2020.9158700","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158700","url":null,"abstract":"Small modular reactors (SMRs) are factory-built transportable nuclear power plants (NPPs) that can generate up to 300 MWe and support new applications for nuclear energy such as hydrogen production, industrial heat generation, and water desalination. SMRs are poised for near-term deployment in the United States and offer improvements over existing NPPs such as passive safety features, greater plant site flexibility, reduced construction costs, load-following operations, and extended refueling cycles. However, in order to realize the benefits of SMRs, there are several challenges related to instrumentation and control (I&C) system components that must be addressed. The I&C systems of an SMR ensure its safe and efficient operation. I&C sensors measure process parameters such as temperature, pressure, level, flow, and neutron flux and provide input to the Reactor Protection System (RPS) to initiate a rapid shutdown if necessary. The performance of these safety-related I&C sensors and systems must be periodically verified to ensure they meet the plant technical specifications for accuracy and response time. In addition, the associated I&C cabling (which includes low-voltage cable assemblies for sensors, Control Rod Drive Mechanisms (CRDMs), and Rod Position Indication (RPI) Systems) is tested as part of normal plant maintenance activities or in support of aging management programs. Over time, exposure to harsh environmental conditions in the plant can result in degradation and failure of I&C sensors and cables. This is especially true for the I&C sensors and cables in SMRs which will be subjected to elevated temperatures, high radiation, and a vacuum atmosphere within the containment vessel during normal plant operation. These conditions lead to excessive Ohmic heating within the cables which further accelerates damage to the cable insulation material and results in premature failure. Frequent cable replacement due to premature degradation is not practical or economical for SMR plant owners. To combat these environmental stressors, the ampacity of the cable must be derated. However, there is limited experience to date with cable derating in vacuum, and no experience with cable derating in vacuum at high temperature and radiation. As a result, Analysis and Measurement Services Corporation (AMS) is conducting a study on several common NPP I&C cables to determine how various insulation materials perform at conditions that emulate those anticipated in the containment of an SMR. The on-going effort is funded under a research and development (R&D) grant awarded to AMS by the U.S. Department of Energy (DOE). In addition, AMS is partnering with the Oak Ridge National Laboratory (ORNL) to conduct specialized testing in support of this study under a separate initiative called the Gateway for Accelerated Innovation in Nuclear (GAIN). The goal of this R&D is to develop technical guidance and technologies to support initial startup and subsequent operation of SMR","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126078191","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158745
D. Robalino, Robert C. Breazeal
The analysis and diagnostics of power and distribution transformers has been performed primarily by time and frequency domain methods. In the frequency domain, power factor or dissipation factor at line frequency is a method widely used but one single measurement at line frequency encounters limitations to analytical and qualitative interpretation of the insulation of a variety of electrical equipment. With the benefits found by wide band dielectric frequency response, the need to incorporate a method capable of better condition assessment in very short time is required in the field. Narrow Band Dielectric Frequency Response (NB DFR) is a series of dielectric loss measurements performed in a narrow frequency band typically between 1 and 500 Hz or even up to 1 kHz, at a low voltage. In 2015, Southern California Edison began utilizing NB DFR for dielectric loss measurements in the interwinding insulation in condition assessment of used distribution class transformers. The scope of the work included thermal accelerated aging subjecting the transformers different levels of overload while using NB DFR to document changes in the dielectric response as the oil and paper throughout the process. Based on the experimental results obtained, authors provide throughout this document an analytical procedure to evaluate the NB DFR described as a plot of PF/DF as a function of frequency as well as capacitance (C) as a function of frequency. Most important is to consider the factors influencing the changes in the dielectric response after scheduled thermal accelerated aging. On the basis of specific characteristics observed within the plot, definite assertions may be made in regards to the condition of the cellulose and oil. This work reflects the benefits of NB DFR to evaluate the aging process of oil-paper insulation in comparison to conventional line frequency power factor testing.
{"title":"Evaluation of Distribution Class Transformers Using Narrow Band Dielectric Frequency Response Measurements","authors":"D. Robalino, Robert C. Breazeal","doi":"10.1109/eic47619.2020.9158745","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158745","url":null,"abstract":"The analysis and diagnostics of power and distribution transformers has been performed primarily by time and frequency domain methods. In the frequency domain, power factor or dissipation factor at line frequency is a method widely used but one single measurement at line frequency encounters limitations to analytical and qualitative interpretation of the insulation of a variety of electrical equipment. With the benefits found by wide band dielectric frequency response, the need to incorporate a method capable of better condition assessment in very short time is required in the field. Narrow Band Dielectric Frequency Response (NB DFR) is a series of dielectric loss measurements performed in a narrow frequency band typically between 1 and 500 Hz or even up to 1 kHz, at a low voltage. In 2015, Southern California Edison began utilizing NB DFR for dielectric loss measurements in the interwinding insulation in condition assessment of used distribution class transformers. The scope of the work included thermal accelerated aging subjecting the transformers different levels of overload while using NB DFR to document changes in the dielectric response as the oil and paper throughout the process. Based on the experimental results obtained, authors provide throughout this document an analytical procedure to evaluate the NB DFR described as a plot of PF/DF as a function of frequency as well as capacitance (C) as a function of frequency. Most important is to consider the factors influencing the changes in the dielectric response after scheduled thermal accelerated aging. On the basis of specific characteristics observed within the plot, definite assertions may be made in regards to the condition of the cellulose and oil. This work reflects the benefits of NB DFR to evaluate the aging process of oil-paper insulation in comparison to conventional line frequency power factor testing.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127825587","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 : 2020-06-01DOI: 10.1109/eic47619.2020.9158650
P. Cheetham, T. Stamm, S. Telikapalli, A. Mullings, M. Kvitkovicova, C. H. Kim, S. Pamidi
Medium voltage gas insulated transmission lines (GIL) are explored with the possibility of a continuous manufacturing process. The cables used SF6 replacement gases as the dielectric. The alternative to the traditional GIL design makes it feasible for the cables to be suitable for retrofitting within existing cable ducts with high ampacity GIL while addressing the environmental concerns with this technology. RF air-core dielectric cables with equivalent physical dimensions were identified as potential medium voltage GIL designs. Several model cables were fabricated using the RF cables and characterized for electrical insulation designs.
{"title":"Gas Insulated Medium Voltage Power Distribution Networks","authors":"P. Cheetham, T. Stamm, S. Telikapalli, A. Mullings, M. Kvitkovicova, C. H. Kim, S. Pamidi","doi":"10.1109/eic47619.2020.9158650","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158650","url":null,"abstract":"Medium voltage gas insulated transmission lines (GIL) are explored with the possibility of a continuous manufacturing process. The cables used SF6 replacement gases as the dielectric. The alternative to the traditional GIL design makes it feasible for the cables to be suitable for retrofitting within existing cable ducts with high ampacity GIL while addressing the environmental concerns with this technology. RF air-core dielectric cables with equivalent physical dimensions were identified as potential medium voltage GIL designs. Several model cables were fabricated using the RF cables and characterized for electrical insulation designs.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"40 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131235698","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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