Pub Date : 2011-10-01DOI: 10.1109/CEIDP.2011.6232759
Lin Zhang, Jianfeng Hui, Xiaobo Meng, Xingming Bian, Li-ming Wang, Z. Guan
The air gap breakdown at high altitude is attracting more and more attention from investigators. As the altitude increases, air pressure and humidity varies, discharge in air gap becomes more complex. The streamer propagation is a significant physical process during air gap breakdown. Research on streamer characteristic is helpful for understanding the mechanism of air gap breakdown. In the paper, a simulation model of streamer dynamics was carried out using fluid model. The numerical results of streamer dynamics were compared with the experiment results which had been published in former paper under different air pressure and humidity. Good agreement between test and numerical computation at stability propagation field is obtained, which demonstrates the validity of the simulation model of streamer dynamics. Then, the simulation model was adopted to study the influence of background electric field, duration and amplitude of voltage pulse on streamer propagation. With the rising of duration and amplitude of voltage pulse, the intrinsic stability field for streamer propagation and corresponding propagation velocity decrease.
{"title":"The simulation of streamer dynamics in the air gap","authors":"Lin Zhang, Jianfeng Hui, Xiaobo Meng, Xingming Bian, Li-ming Wang, Z. Guan","doi":"10.1109/CEIDP.2011.6232759","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232759","url":null,"abstract":"The air gap breakdown at high altitude is attracting more and more attention from investigators. As the altitude increases, air pressure and humidity varies, discharge in air gap becomes more complex. The streamer propagation is a significant physical process during air gap breakdown. Research on streamer characteristic is helpful for understanding the mechanism of air gap breakdown. In the paper, a simulation model of streamer dynamics was carried out using fluid model. The numerical results of streamer dynamics were compared with the experiment results which had been published in former paper under different air pressure and humidity. Good agreement between test and numerical computation at stability propagation field is obtained, which demonstrates the validity of the simulation model of streamer dynamics. Then, the simulation model was adopted to study the influence of background electric field, duration and amplitude of voltage pulse on streamer propagation. With the rising of duration and amplitude of voltage pulse, the intrinsic stability field for streamer propagation and corresponding propagation velocity decrease.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"85 1","pages":"728-731"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74819591","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232718
L. Bo, R. Gorur
This paper presents a theoretical model for evaluating flashover performance of composite insulators under contaminated conditions. The model introduces several new features when compared with existing models such as, the formation of dry bands along the surface, variations in surface wettability and insulator shape. The model draws heavily from experimental measurements of flashover voltage and surface resistance measured under wet conditions of composite insulators with housings made from silicone rubber, ethylene propylene rubber and epoxy, as well as electric field computations. The model has been used to illustrate the dominant role played by shape and housing material in the flashover process.
{"title":"Modeling flashover of composite insulators under contaminated conditions","authors":"L. Bo, R. Gorur","doi":"10.1109/CEIDP.2011.6232718","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232718","url":null,"abstract":"This paper presents a theoretical model for evaluating flashover performance of composite insulators under contaminated conditions. The model introduces several new features when compared with existing models such as, the formation of dry bands along the surface, variations in surface wettability and insulator shape. The model draws heavily from experimental measurements of flashover voltage and surface resistance measured under wet conditions of composite insulators with housings made from silicone rubber, ethylene propylene rubber and epoxy, as well as electric field computations. The model has been used to illustrate the dominant role played by shape and housing material in the flashover process.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"36 1","pages":"559-562"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80328176","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232632
M. Florkowski, B. Florkowska, J. Furgał, P. Pająk
Transformers operating in the power grid or in an industrial environment may be subjected to transients or stimulus with different wave fronts. In industrial networks distribution transformers are exposed to many switching operations which often generate overvoltages. Overvoltages usually have oscillatory components. These components can be sources of resonance inside overvoltages in transformers. If the spectrum of incoming surge voltage matches that of the winding, a corresponding winding resonance will be excited. Therefore external transients occurring in power systems can trigger internal overvoltages with large maximum values in the transformer windings. An analysis of the influence of oil temperature on the frequency characteristics of voltage in transformer windings is very important from a practical point of view. The impact of oil and temperature on the frequency characteristics of internal voltages are presented in this paper. Time domain step response signals of transient voltages in windings, generated for a given step voltage with a selected rise time, are also presented. The paper presents investigation results for disc and layer model transformer windings. The presented results might be used both in the design and optimization of transformers windings.
{"title":"Influence of oil temperature on frequency characteristics of disk and layer transformer windings","authors":"M. Florkowski, B. Florkowska, J. Furgał, P. Pająk","doi":"10.1109/CEIDP.2011.6232632","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232632","url":null,"abstract":"Transformers operating in the power grid or in an industrial environment may be subjected to transients or stimulus with different wave fronts. In industrial networks distribution transformers are exposed to many switching operations which often generate overvoltages. Overvoltages usually have oscillatory components. These components can be sources of resonance inside overvoltages in transformers. If the spectrum of incoming surge voltage matches that of the winding, a corresponding winding resonance will be excited. Therefore external transients occurring in power systems can trigger internal overvoltages with large maximum values in the transformer windings. An analysis of the influence of oil temperature on the frequency characteristics of voltage in transformer windings is very important from a practical point of view. The impact of oil and temperature on the frequency characteristics of internal voltages are presented in this paper. Time domain step response signals of transient voltages in windings, generated for a given step voltage with a selected rise time, are also presented. The paper presents investigation results for disc and layer model transformer windings. The presented results might be used both in the design and optimization of transformers windings.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"81 1","pages":"203-206"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76099629","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232629
P. Agoramurthy, L. Campana, R. Sundararajan
Cancer is the second most common cause of death in the United States of America. It accounts for nearly 1 out of four deaths. Excluding cancers of the skin, breast cancer is the most frequently diagnosed cancer in women. With such a high rate of incidence, there is clearly a need for additional complementary/supplementary, and alternate treatments, especially for in-operable tumors and chemo- and radio-resistive patients. Electrochemotherapy, the method by which high intensity, short duration electrical voltage pulses are used to temporarily open pores of cells to enhance the uptake of the chemodrug, is gaining popularity in drug delivery for cancer treatment. This paper aims at providing a model by which breast cancer tissues can be studied and analyzed for treatment by electroporation. Maxwell 13, an Ansoft software package is used for 2D simulation of electrodes and tumor tissues. Suitable electrode models are developed for treatment of invasive and in-situ breast cancer. Finite element analysis of these models demonstrate the electric field intensity and distribution in the tumors. Effects of various electrode types are studied. For large tumors, multi-electrode arrays are used to cover more area compared to currently existing needle arrays. These results will help in electrode design for clinical applications in the treatment of larger tumors using electrical pulse-mediated drug delivery techniques.
{"title":"Finite element modeling and analysis of human breast tissue for electrochemotherapy","authors":"P. Agoramurthy, L. Campana, R. Sundararajan","doi":"10.1109/CEIDP.2011.6232629","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232629","url":null,"abstract":"Cancer is the second most common cause of death in the United States of America. It accounts for nearly 1 out of four deaths. Excluding cancers of the skin, breast cancer is the most frequently diagnosed cancer in women. With such a high rate of incidence, there is clearly a need for additional complementary/supplementary, and alternate treatments, especially for in-operable tumors and chemo- and radio-resistive patients. Electrochemotherapy, the method by which high intensity, short duration electrical voltage pulses are used to temporarily open pores of cells to enhance the uptake of the chemodrug, is gaining popularity in drug delivery for cancer treatment. This paper aims at providing a model by which breast cancer tissues can be studied and analyzed for treatment by electroporation. Maxwell 13, an Ansoft software package is used for 2D simulation of electrodes and tumor tissues. Suitable electrode models are developed for treatment of invasive and in-situ breast cancer. Finite element analysis of these models demonstrate the electric field intensity and distribution in the tumors. Effects of various electrode types are studied. For large tumors, multi-electrode arrays are used to cover more area compared to currently existing needle arrays. These results will help in electrode design for clinical applications in the treatment of larger tumors using electrical pulse-mediated drug delivery techniques.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"13 1","pages":"191-194"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86610067","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232760
H. Couderc, Y. Corlu, S. Savoie, M. Frechette, É. David
Microcomposites epoxies are widely used as high voltage insulation. A new way to improve such materials is to add nanoparticles to the epoxy matrix, thus forming a nanostructured microcomposite. For this study, epoxy composites films filled with 60% wt of quartz microparticles were prepared, reinforced or not by 0.45% wt of organically modified Montmorillonite C30B. The dielectric breakdown strength of the samples was studied using two types of electrode and the statistical analysis of the breakdown data was performed using the Weibull distribution. The use of different electrode geometries implied a different distribution of the electrical field magnitude both in the dielectric sample and in the surrounding medium. Rigid films with a typical thickness of 1 mm are set between electrodes embedded in oil and AC voltage was increased at a constant rate until breakdown occurs. No significant difference was found in the breakdown data for microcomposites and nanostructured composites. The use of a more uniform electrical field decreases slightly the measured dielectric breakdown strength. The shape factor associated with the distribution dispersion is unchanged for both studied cases, but very low compared to classical industrial materials. Finally, the thus obtained results warrant the use of smaller-area samples if non-uniform field conditions are used.
{"title":"Dielectric breakdown of an epoxy/quartz composite and a nanostructured epoxy/quartz/Montmorillonite composite. Influence of electrode geometry","authors":"H. Couderc, Y. Corlu, S. Savoie, M. Frechette, É. David","doi":"10.1109/CEIDP.2011.6232760","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232760","url":null,"abstract":"Microcomposites epoxies are widely used as high voltage insulation. A new way to improve such materials is to add nanoparticles to the epoxy matrix, thus forming a nanostructured microcomposite. For this study, epoxy composites films filled with 60% wt of quartz microparticles were prepared, reinforced or not by 0.45% wt of organically modified Montmorillonite C30B. The dielectric breakdown strength of the samples was studied using two types of electrode and the statistical analysis of the breakdown data was performed using the Weibull distribution. The use of different electrode geometries implied a different distribution of the electrical field magnitude both in the dielectric sample and in the surrounding medium. Rigid films with a typical thickness of 1 mm are set between electrodes embedded in oil and AC voltage was increased at a constant rate until breakdown occurs. No significant difference was found in the breakdown data for microcomposites and nanostructured composites. The use of a more uniform electrical field decreases slightly the measured dielectric breakdown strength. The shape factor associated with the distribution dispersion is unchanged for both studied cases, but very low compared to classical industrial materials. Finally, the thus obtained results warrant the use of smaller-area samples if non-uniform field conditions are used.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"78 1","pages":"732-735"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85167894","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232746
B. Du, J. Zhang, Jie Li, L. Wang, Kai Wu
Epoxy resin has become an integral part of electronic and electrical devices where the material is exposed to pulse stress. Surface charge accumulation and decay of charged dielectric materials are very important parameters related to the electrical properties of the material. Nano-composite technology makes it possible to improve electrical properties of insulating materials. Therefore, it is important to investigate the dynamic behavior of surface charge decay influenced by the nano filler on epoxy resin. In this paper, it was attempted to clarify the effect of pulse stress on the electrical properties of epoxy resin nanocomposites focused on the surface charge accumulation and decay based on the TiO2 nano-filler. Prior to test, the samples were prepared by dispersing nano-scale TiO2 into epoxy resin by mixing with shear force. Corona charging and decay tests were independently performed at room temperature with the same humidity. The surface charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the accumulated charge density as well as the charge decay rate upon the different nano filler loading that is varied as a function of the rise time of pulse stress. It is suggested that the charge dynamics is dependent upon the characteristics of localized surface states that are altered by the nano filler induced chemical reactions.
{"title":"Effect of pulse stress on surface charge of epoxy nanocomposites with TiO2 particles","authors":"B. Du, J. Zhang, Jie Li, L. Wang, Kai Wu","doi":"10.1109/CEIDP.2011.6232746","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232746","url":null,"abstract":"Epoxy resin has become an integral part of electronic and electrical devices where the material is exposed to pulse stress. Surface charge accumulation and decay of charged dielectric materials are very important parameters related to the electrical properties of the material. Nano-composite technology makes it possible to improve electrical properties of insulating materials. Therefore, it is important to investigate the dynamic behavior of surface charge decay influenced by the nano filler on epoxy resin. In this paper, it was attempted to clarify the effect of pulse stress on the electrical properties of epoxy resin nanocomposites focused on the surface charge accumulation and decay based on the TiO2 nano-filler. Prior to test, the samples were prepared by dispersing nano-scale TiO2 into epoxy resin by mixing with shear force. Corona charging and decay tests were independently performed at room temperature with the same humidity. The surface charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the accumulated charge density as well as the charge decay rate upon the different nano filler loading that is varied as a function of the rise time of pulse stress. It is suggested that the charge dynamics is dependent upon the characteristics of localized surface states that are altered by the nano filler induced chemical reactions.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"3 1","pages":"672-675"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89724354","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232778
M. Marzinotto, G. Mazzanti
This paper proposes a procedure for space charge measurements in full-size HVDC extruded cables, that consists in a detailed protocol indicating voltage polarity, time intervals between measurements, volt-on and volt-off conditions, and so on. The proposed protocol accounts for the experimental practices of such kind of measurements in terms of poling time, depolarization time, heating and cooling of specimens. Such procedure seems particularly useful for assessing the space charge behaviour in terms of electric field of a cable that has undergone a prequalification test. The measurement can also give indication about the possibility of avoiding the repetition of prequalification tests and/or type tests in the case of HVDC cables, for which the Laplacian field profile cannot be taken - strictly speaking - as a reference for comparing the electrothermal stress level of new realizations with that of previously manufactured cables.
{"title":"A procedure for space charge measurements in full-size HVDC extruded cables","authors":"M. Marzinotto, G. Mazzanti","doi":"10.1109/CEIDP.2011.6232778","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232778","url":null,"abstract":"This paper proposes a procedure for space charge measurements in full-size HVDC extruded cables, that consists in a detailed protocol indicating voltage polarity, time intervals between measurements, volt-on and volt-off conditions, and so on. The proposed protocol accounts for the experimental practices of such kind of measurements in terms of poling time, depolarization time, heating and cooling of specimens. Such procedure seems particularly useful for assessing the space charge behaviour in terms of electric field of a cable that has undergone a prequalification test. The measurement can also give indication about the possibility of avoiding the repetition of prequalification tests and/or type tests in the case of HVDC cables, for which the Laplacian field profile cannot be taken - strictly speaking - as a reference for comparing the electrothermal stress level of new realizations with that of previously manufactured cables.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"36 1","pages":"804-807"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90846214","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232731
P. Trnka, V. Mentlík, P. Prosr, R. Polanský
Electrical technology diagnostics is a branch of science examining the actual state of electrical machinery under the operation when using two basic accesses. The first and older one is an “off-line diagnostics”. It means a device or an appliance subjected to diagnostic process need to be for example disconnected from circuit, turned off or stopped. An on-line diagnostics - diagnosing a device during its operation is the second access, nowadays more and more developed. Both diagnostics require detailed knowledge of physical processes taking place in diagnosed materials, devices etc., hence it is necessary to monitor the trends of specific parameters in time. This knowledge is mainly needed in the case of newly developed material application. A mathematical model is designed to describe observed physical processes according to the measured parameters in the diagnostic system. The paper presents results of long-term experiment dealing mainly with thermal and voltage ageing of electrical insulating materials. Both two and three component dielectrics are considered. Study is searching the correlation between ageing of the materials samples and ageing of the whole electrical devices. Tested samples of two and three component dielectric materials were subjected to the long-term laboratory ageing. The test samples were treated by high temperature, by increased voltage and cycled humidity. Different sets of samples were subjected to each of mentioned ageing factors. Ageing characteristics were calculated from different monitored parameters for each ageing factor. Important electrical parameters such as dissipation factor and resistivity vs. ageing time of aged materials are presented. Correlation between ageing characteristics of the same material and different ageing factors has been searched.
{"title":"Study of degradation processes of two- and three-component insulating composites","authors":"P. Trnka, V. Mentlík, P. Prosr, R. Polanský","doi":"10.1109/CEIDP.2011.6232731","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232731","url":null,"abstract":"Electrical technology diagnostics is a branch of science examining the actual state of electrical machinery under the operation when using two basic accesses. The first and older one is an “off-line diagnostics”. It means a device or an appliance subjected to diagnostic process need to be for example disconnected from circuit, turned off or stopped. An on-line diagnostics - diagnosing a device during its operation is the second access, nowadays more and more developed. Both diagnostics require detailed knowledge of physical processes taking place in diagnosed materials, devices etc., hence it is necessary to monitor the trends of specific parameters in time. This knowledge is mainly needed in the case of newly developed material application. A mathematical model is designed to describe observed physical processes according to the measured parameters in the diagnostic system. The paper presents results of long-term experiment dealing mainly with thermal and voltage ageing of electrical insulating materials. Both two and three component dielectrics are considered. Study is searching the correlation between ageing of the materials samples and ageing of the whole electrical devices. Tested samples of two and three component dielectric materials were subjected to the long-term laboratory ageing. The test samples were treated by high temperature, by increased voltage and cycled humidity. Different sets of samples were subjected to each of mentioned ageing factors. Ageing characteristics were calculated from different monitored parameters for each ageing factor. Important electrical parameters such as dissipation factor and resistivity vs. ageing time of aged materials are presented. Correlation between ageing characteristics of the same material and different ageing factors has been searched.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"41 1","pages":"611-614"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81415233","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232710
N. Rama Rao, J. Amarnath
In this paper, Dielectric coated outer enclosure of single phase Gas Insulated Busduct(GIB) is simulated for computing the trajectory of contaminated metal particles. A mathematical model is developed to find the movement pattern of a metallic particle in a Gas Insulated Busduct. All forces acting on the metallic particle depends on GIB geometric parameters, electrostatic charge acquired by the particle, electric field present at the particle location, the drag coefficient and Reynold's number. The second order differential equation of moving metallic particle is solved iteratively using Runge Kutta method. Electric fields at the instantaneous particle locations were computed using the Charge Simulation Method (CSM). The movements of metallic particle with Analytical field calculation are compared with charge simulation field calculation methods and presented in this paper.
{"title":"Metallic particle trajectory in an isolated conductor Gas Insulated Busduct(GIB) with dielectric coated enclosure using Charge Simulation Method","authors":"N. Rama Rao, J. Amarnath","doi":"10.1109/CEIDP.2011.6232710","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232710","url":null,"abstract":"In this paper, Dielectric coated outer enclosure of single phase Gas Insulated Busduct(GIB) is simulated for computing the trajectory of contaminated metal particles. A mathematical model is developed to find the movement pattern of a metallic particle in a Gas Insulated Busduct. All forces acting on the metallic particle depends on GIB geometric parameters, electrostatic charge acquired by the particle, electric field present at the particle location, the drag coefficient and Reynold's number. The second order differential equation of moving metallic particle is solved iteratively using Runge Kutta method. Electric fields at the instantaneous particle locations were computed using the Charge Simulation Method (CSM). The movements of metallic particle with Analytical field calculation are compared with charge simulation field calculation methods and presented in this paper.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"43 1","pages":"526-529"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78731512","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 : 2011-10-01DOI: 10.1109/CEIDP.2011.6232692
J. Acevedo
It is well known that Partial Discharge (PD) is the latest stage of almost all failure modes in electrical insulation. Early detection of this phenomenon can avoid catastrophic failures of electrical equipments installed on transmission, distribution and generating stations. In this paper, two practical experiences using Radio Frequency Scanning (RFS) to detect partial discharge in electrical equipments are described. PD occurrence in two of three phases of a 13.8 kV air isolated bus duct was detected using RFS combined with single phase energizing of each phase of the bus at different voltages. In this case, RFS technique was used after suspicions of PD activity in a 115 kV GSU power transformer and a 160 MVA generator was detected using acoustic emission (AE) and EMI tests with Radio Frequency Current Transformers. Finally, the source of PD was detected in the 13.8 kV bus duct connecting generator with power transformer. The second case describes the use of RFS to detect PD and corona activity inside a 34.5 kV metal clad switchgear located on a 500 kV substation and close to an energized overhead line. Although the electrical interference in the area was the main concern to get a reliable measurement, digital filtering and wide band scanning of the RFS technique showed high efficacy to discriminate PD activity inside the switchgear. Additional infrared scanning was done with the purpose of locating the points where corona and PD occurred. Final RFS results confirmed the abnormal condition of a circuit breaker in the switchgear.
{"title":"Field experiences using Radio Frequency Scanning (RFS) to detect partial discharge in bus duct and metal clad switchgear of electrical generating and transmission substations","authors":"J. Acevedo","doi":"10.1109/CEIDP.2011.6232692","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232692","url":null,"abstract":"It is well known that Partial Discharge (PD) is the latest stage of almost all failure modes in electrical insulation. Early detection of this phenomenon can avoid catastrophic failures of electrical equipments installed on transmission, distribution and generating stations. In this paper, two practical experiences using Radio Frequency Scanning (RFS) to detect partial discharge in electrical equipments are described. PD occurrence in two of three phases of a 13.8 kV air isolated bus duct was detected using RFS combined with single phase energizing of each phase of the bus at different voltages. In this case, RFS technique was used after suspicions of PD activity in a 115 kV GSU power transformer and a 160 MVA generator was detected using acoustic emission (AE) and EMI tests with Radio Frequency Current Transformers. Finally, the source of PD was detected in the 13.8 kV bus duct connecting generator with power transformer. The second case describes the use of RFS to detect PD and corona activity inside a 34.5 kV metal clad switchgear located on a 500 kV substation and close to an energized overhead line. Although the electrical interference in the area was the main concern to get a reliable measurement, digital filtering and wide band scanning of the RFS technique showed high efficacy to discriminate PD activity inside the switchgear. Additional infrared scanning was done with the purpose of locating the points where corona and PD occurred. Final RFS results confirmed the abnormal condition of a circuit breaker in the switchgear.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"294 1","pages":"452-455"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79546869","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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