Pub Date : 2018-06-01DOI: 10.1109/eic.2018.8481112
F. Dollinger
At Haefely Hipotronics, we have seen and have even surprisingly discovered situations, in which tests were performed in an improper way: typically Murphy's Law. Various causes are involved, such as misinterpretation of standard (IEC/IEEE), or misinterpretation of the instrument settings, or inadequate instrumentation or test system. Performing tests improperly can lead measurements that do not conform to the applicable (IEC/IEEE) standard or may produce wrong measurement results, that may even damage the test object, test system, or cause injury to the operator. This presentation is a summary of some situations that have been seen onsite, covering tests like partial discharge measurement, loss measurement and lightning impulse test.
{"title":"Mitigating Murphy's Law While Test - Volume 1","authors":"F. Dollinger","doi":"10.1109/eic.2018.8481112","DOIUrl":"https://doi.org/10.1109/eic.2018.8481112","url":null,"abstract":"At Haefely Hipotronics, we have seen and have even surprisingly discovered situations, in which tests were performed in an improper way: typically Murphy's Law. Various causes are involved, such as misinterpretation of standard (IEC/IEEE), or misinterpretation of the instrument settings, or inadequate instrumentation or test system. Performing tests improperly can lead measurements that do not conform to the applicable (IEC/IEEE) standard or may produce wrong measurement results, that may even damage the test object, test system, or cause injury to the operator. This presentation is a summary of some situations that have been seen onsite, covering tests like partial discharge measurement, loss measurement and lightning impulse test.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122173276","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481125
G. Montanari, P. Seri, Martin Stöck, Bayu Putra Andrianto, S. A. Filliben
This paper shows results of a preliminary study about electric strength and electrical endurance properties of various types of polyimide tapes, including the corona-resistant ones, in the presence and absence of partial discharges. Feasibility of insulation design for applications, such as automotive, where the rated voltage is increasing significantly, and the presence of partial discharges during operating life is likely, in investigated, with apparently positive indications.
{"title":"Investigating Electrical Performance of Polyimide Insulation Tapes for Automotive Application","authors":"G. Montanari, P. Seri, Martin Stöck, Bayu Putra Andrianto, S. A. Filliben","doi":"10.1109/EIC.2018.8481125","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481125","url":null,"abstract":"This paper shows results of a preliminary study about electric strength and electrical endurance properties of various types of polyimide tapes, including the corona-resistant ones, in the presence and absence of partial discharges. Feasibility of insulation design for applications, such as automotive, where the rated voltage is increasing significantly, and the presence of partial discharges during operating life is likely, in investigated, with apparently positive indications.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122487106","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481056
Xuewei Zhang
Smart materials systems have been widely used to develop sensors, actuators and energy harvesters. This work is driven by the question about the possibility of strengthening electrical insulation systems via new designs based on smart materials/structures. Specifically, in this work, we seek for innovative solutions to partial discharge (PD) detection and mitigation inside gas or liquid insulated high voltage equipment by exploiting smart material systems' response to electric potential or current changes. The early-concept design includes a dielectric elastomer based actuator which has a spring that is relaxed when normal high voltage is applied to the elastomer (stretched). When partial discharge occurs, the voltage drop will cause the elastomer to contract, compress the spring, enlarge the insulation gap, and lower the electric field. The transient response of the dielectric elastomer actuator subject to PD voltage pulses is simulated. The results indicate that the systems can respond to PD in the direction toward PD suppression. This work also explores various settings to reveal the requirements on the material and system parameters for their use in high voltage insulation. This work presents a promising paradigm in the electrical insulation of high voltage equipment which combines sensing and actuating in the same material and features “responsive monitoring” by harnessing the electromechanical and/or electrochemical properties of smart materials.
{"title":"Design and Modeling of Smart Material Systems for High Voltage Insulation","authors":"Xuewei Zhang","doi":"10.1109/EIC.2018.8481056","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481056","url":null,"abstract":"Smart materials systems have been widely used to develop sensors, actuators and energy harvesters. This work is driven by the question about the possibility of strengthening electrical insulation systems via new designs based on smart materials/structures. Specifically, in this work, we seek for innovative solutions to partial discharge (PD) detection and mitigation inside gas or liquid insulated high voltage equipment by exploiting smart material systems' response to electric potential or current changes. The early-concept design includes a dielectric elastomer based actuator which has a spring that is relaxed when normal high voltage is applied to the elastomer (stretched). When partial discharge occurs, the voltage drop will cause the elastomer to contract, compress the spring, enlarge the insulation gap, and lower the electric field. The transient response of the dielectric elastomer actuator subject to PD voltage pulses is simulated. The results indicate that the systems can respond to PD in the direction toward PD suppression. This work also explores various settings to reveal the requirements on the material and system parameters for their use in high voltage insulation. This work presents a promising paradigm in the electrical insulation of high voltage equipment which combines sensing and actuating in the same material and features “responsive monitoring” by harnessing the electromechanical and/or electrochemical properties of smart materials.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"83 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120856122","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481091
M. Hikita, Hikaru Mizoguchi, Tomohiro Kubo, Tomoki Uchimura, M. Kozako, Jintong Sun, A. Izumi, K. Karasawa, T. Ueno, T. Hirose, S. Hiroshima
Repetitive partial discharge inception voltage (RPDIV) measurement is indispensable for inverter-fed motor when testing the insulation dignity according to IEC 60034-18-41 IS. Our previous study showed detection sensitivity comparison among kinds of electromagnetic (EM) sensors for PD measurement in an actual motor core. This paper deals with an influence of the location of EM sensors on the sensitivity of detected EM wave to quantitatively evaluate RPDIV. As a result, it was found that employing the EM wave sensor located at the furthest position from the PD source on Z axis to detect PD can result in estimating higher RPDIV by 7.5 % at most than an actual one, depending on the sensor location. The possibility of location of a PD source using multiple LSs placed in the actual core is also suggested from differences in the signal strength and time for EM signal to reach multiple LSs.
{"title":"Influence of Electromagnetic Sensor Location on Repetitive Partial Discharge Inception Voltage in Actual Stator Core of Inverter Fed Motor","authors":"M. Hikita, Hikaru Mizoguchi, Tomohiro Kubo, Tomoki Uchimura, M. Kozako, Jintong Sun, A. Izumi, K. Karasawa, T. Ueno, T. Hirose, S. Hiroshima","doi":"10.1109/EIC.2018.8481091","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481091","url":null,"abstract":"Repetitive partial discharge inception voltage (RPDIV) measurement is indispensable for inverter-fed motor when testing the insulation dignity according to IEC 60034-18-41 IS. Our previous study showed detection sensitivity comparison among kinds of electromagnetic (EM) sensors for PD measurement in an actual motor core. This paper deals with an influence of the location of EM sensors on the sensitivity of detected EM wave to quantitatively evaluate RPDIV. As a result, it was found that employing the EM wave sensor located at the furthest position from the PD source on Z axis to detect PD can result in estimating higher RPDIV by 7.5 % at most than an actual one, depending on the sensor location. The possibility of location of a PD source using multiple LSs placed in the actual core is also suggested from differences in the signal strength and time for EM signal to reach multiple LSs.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121614761","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481114
Hugh Zhu
Vibration sparking can cause serious erosion and deterioration of the stator bar insulation. A circuit model of the semi-conductive layer of a stator bar is proposed to describe the parameters of VS generation and the distribution of the parasitic current along the semi-conductive layer. A simulated VS system was set up to generate VS activity. This paper investigated the development process of and deterioration levels of VS erosion on the bar surface with aging time and the factors influencing VS erosion. The results show that there were three stages in the VS development process with different sparking intensities at each stage. The resistivity of the semi-conductive layer greatly increased after VS erosion. It was found that high energy from VS can result in decomposition of the semi-conductive material and lead to damage of the groundwall insulation.
{"title":"Development Process of Vibration Sparking Erosion on Stator Bars","authors":"Hugh Zhu","doi":"10.1109/EIC.2018.8481114","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481114","url":null,"abstract":"Vibration sparking can cause serious erosion and deterioration of the stator bar insulation. A circuit model of the semi-conductive layer of a stator bar is proposed to describe the parameters of VS generation and the distribution of the parasitic current along the semi-conductive layer. A simulated VS system was set up to generate VS activity. This paper investigated the development process of and deterioration levels of VS erosion on the bar surface with aging time and the factors influencing VS erosion. The results show that there were three stages in the VS development process with different sparking intensities at each stage. The resistivity of the semi-conductive layer greatly increased after VS erosion. It was found that high energy from VS can result in decomposition of the semi-conductive material and lead to damage of the groundwall insulation.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115215138","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481140
Tianxin Zhuang, M. Ren, Shujing Yang, M. Dong
Measurements of partial discharge play an important part in the study of dielectric materials, nevertheless, the physical processes of partial discharge are not yet clear. Pulse current method is recognized as the only effective way to quantify the charge. However, there is a limitation of such approach to detect PD pulses below the noise threshold and slow charge movement. In this work, a new technology “Excess Current Method” enables the measurement of the micro discharge and slow charge movements during PD. Proposed in some published studies, the excess current is referenced as the additional current component associated with the PD process by measuring the difference of dielectric response currents through a test object without and with PD activity. A measurement setup for simultaneous measurement of PD excess currents and PD currents averaged from about 300 periods is applied and three typical insulation defect models were tested under 50Hz voltage. Results of the excess currents during and after PD activity, including waveforms and charges are showed and discussed. The results indicate that the amplitude is higher and the charges are more of the excess currents than the PD currents, which reveals that some current components are ignored by pulsed current method but detected by excess current method. Furthermore, a weak excess current is measured for the dielectric barrier and air void PD models when the voltage dropped below the Partial Discharge Extinction Voltage (PDEV). The analysis of non-PD excess current also reflects the slow charge movements during PD. The measurement of excess current provides additional insight into PD mechanisms and shows the potential of completing the conventional PD detection.
{"title":"Excess Current Characteristics of Typical Insulation Defects Partial Discharge Under 50Hz","authors":"Tianxin Zhuang, M. Ren, Shujing Yang, M. Dong","doi":"10.1109/EIC.2018.8481140","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481140","url":null,"abstract":"Measurements of partial discharge play an important part in the study of dielectric materials, nevertheless, the physical processes of partial discharge are not yet clear. Pulse current method is recognized as the only effective way to quantify the charge. However, there is a limitation of such approach to detect PD pulses below the noise threshold and slow charge movement. In this work, a new technology “Excess Current Method” enables the measurement of the micro discharge and slow charge movements during PD. Proposed in some published studies, the excess current is referenced as the additional current component associated with the PD process by measuring the difference of dielectric response currents through a test object without and with PD activity. A measurement setup for simultaneous measurement of PD excess currents and PD currents averaged from about 300 periods is applied and three typical insulation defect models were tested under 50Hz voltage. Results of the excess currents during and after PD activity, including waveforms and charges are showed and discussed. The results indicate that the amplitude is higher and the charges are more of the excess currents than the PD currents, which reveals that some current components are ignored by pulsed current method but detected by excess current method. Furthermore, a weak excess current is measured for the dielectric barrier and air void PD models when the voltage dropped below the Partial Discharge Extinction Voltage (PDEV). The analysis of non-PD excess current also reflects the slow charge movements during PD. The measurement of excess current provides additional insight into PD mechanisms and shows the potential of completing the conventional PD detection.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124357915","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481087
C. Hudon, N. Amyot, S. Bernier, É. David, M. Essalihi
Hydro-Quebec has started carrying out Polarization and Depolarization Current measurements (PDC) more than 20 years ago. A Direct Current Ramp Test (DCRT) apparatus has also been built in house in the early 2000's and since 2012 systematic measurements with both tests are prescribed to be done every 6 years on every one of our 350 generators. An extensive comparison of both types of electric tests has been done to determine the influence of factors such as temperature and humidity, type of ground wall insulation and the nature of the stress grading coating on the measured current. The DCRT and PDC test procedures are such that they are not always giving the same diagnosis and sometimes this can easily be explained, but in some case more in depth analysis is required. A comparison of the results of both types of tests was done and the main features and limits are presented herein.
{"title":"Comparison of DC Ramp and Polarization and Depolarisation Tests on Hydrogenerators","authors":"C. Hudon, N. Amyot, S. Bernier, É. David, M. Essalihi","doi":"10.1109/EIC.2018.8481087","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481087","url":null,"abstract":"Hydro-Quebec has started carrying out Polarization and Depolarization Current measurements (PDC) more than 20 years ago. A Direct Current Ramp Test (DCRT) apparatus has also been built in house in the early 2000's and since 2012 systematic measurements with both tests are prescribed to be done every 6 years on every one of our 350 generators. An extensive comparison of both types of electric tests has been done to determine the influence of factors such as temperature and humidity, type of ground wall insulation and the nature of the stress grading coating on the measured current. The DCRT and PDC test procedures are such that they are not always giving the same diagnosis and sometimes this can easily be explained, but in some case more in depth analysis is required. A comparison of the results of both types of tests was done and the main features and limits are presented herein.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124169007","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481085
Mona Ghessemi
Regarding the outstanding properties, commercial availability of starting material, and maturity of the technological processes, silicon carbide (SiC) and gallium nitride (GaN) with a relatively large bandgap of 3.3 eV and 3.4 eV, respectively are the more promising semiconductor materials known as wide bandgap (WBG) semiconductors. WBG semiconductors which are expected to have better efficiency, higher temperature tolerance, and higher voltage blocking capability than their silicon (Si) counterparts having a bandgap of 1.1 eV are changing the landscape of power electronics industry. Moreover, a new class of semiconductor materials so-called ultrawide-bandgap (UWBG) semiconductors with bandgaps higher than that of GaN including diamond (C), gallium oxide (Ga2O3), and aluminum nitride (AIN) currently investigated will be generation-after-next power electronics. However new packaging technologies are needed to realize the mentioned superior system performance with WBG and UWBG devices. Among various factors needed to be addressed for high-density packaging designs of high voltage WBG and UWBG devices, the high electric fields, especially at the edges of the substrate metallization, can lead to unacceptable levels of partial discharges in the silicone gel commonly used as encapsulations. In this paper, geometrical techniques for electric field control inside (U)WBG power electronics modules are studied by finite element method models (FEM) developed in COMSOL Multiphysics.
{"title":"Geometrical Techniques for Electric Field Control in (Ultra) Wide Bandgap Power Electronics Modules","authors":"Mona Ghessemi","doi":"10.1109/EIC.2018.8481085","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481085","url":null,"abstract":"Regarding the outstanding properties, commercial availability of starting material, and maturity of the technological processes, silicon carbide (SiC) and gallium nitride (GaN) with a relatively large bandgap of 3.3 eV and 3.4 eV, respectively are the more promising semiconductor materials known as wide bandgap (WBG) semiconductors. WBG semiconductors which are expected to have better efficiency, higher temperature tolerance, and higher voltage blocking capability than their silicon (Si) counterparts having a bandgap of 1.1 eV are changing the landscape of power electronics industry. Moreover, a new class of semiconductor materials so-called ultrawide-bandgap (UWBG) semiconductors with bandgaps higher than that of GaN including diamond (C), gallium oxide (Ga2O3), and aluminum nitride (AIN) currently investigated will be generation-after-next power electronics. However new packaging technologies are needed to realize the mentioned superior system performance with WBG and UWBG devices. Among various factors needed to be addressed for high-density packaging designs of high voltage WBG and UWBG devices, the high electric fields, especially at the edges of the substrate metallization, can lead to unacceptable levels of partial discharges in the silicone gel commonly used as encapsulations. In this paper, geometrical techniques for electric field control inside (U)WBG power electronics modules are studied by finite element method models (FEM) developed in COMSOL Multiphysics.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134132608","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481059
J. Borghetto, G. Pirovano, C. Tornelli, A. Contin
The experimental set-up and the first results of PD measurements performed to evaluate different types of MV cable-joints under electrical and thermal stresses, are discussed in the paper. Twelve cables equipped with different types of joints were connected together to form a ring in short-circuit. The ring was enegized at rated voltage and current. Cycles of temperature having a period of one day have been applied by controlling the current by means of external coils. PD were monitored during the heating and cooling of the cables. Problems related to calibration and signal interference between the different cables, have been examined. The PD inception and the evolution of PD patterns due to the formation of defects in some joints, are discussed.
{"title":"Test Set-Up and Preliminary Results of PD Measurements Performed During Thermal Cycles Applied to Different Types of MV Cable Joints","authors":"J. Borghetto, G. Pirovano, C. Tornelli, A. Contin","doi":"10.1109/EIC.2018.8481059","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481059","url":null,"abstract":"The experimental set-up and the first results of PD measurements performed to evaluate different types of MV cable-joints under electrical and thermal stresses, are discussed in the paper. Twelve cables equipped with different types of joints were connected together to form a ring in short-circuit. The ring was enegized at rated voltage and current. Cycles of temperature having a period of one day have been applied by controlling the current by means of external coils. PD were monitored during the heating and cooling of the cables. Problems related to calibration and signal interference between the different cables, have been examined. The PD inception and the evolution of PD patterns due to the formation of defects in some joints, are discussed.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123930597","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 : 2018-06-01DOI: 10.1109/EIC.2018.8481019
A. Staubach, G. Schmidt, F. Pohlmann, H. Hirsch
An essential component of the insulation system of large electric machines is the corona protection system. One important parameter in particular of the outer corona protection (OCP) is the ohmic resistance together with service related current and potential distributions as well as locally generated power losses. These parameters can be calculated and analyzed using finite element method (FEM). In this study the influence of the OCP material parameters on the electric field distributions in the insulation system are investigated. Real wrapped insulation system structures are modeled with a high level of detail by consideration of anisotropic material characteristics. A new approach to assess the ideal anisotropic OCP material properties is introduced with the process of the swarm optimization algorithm. The results of these examinations are used for the development of an ideal OCP system with the aim to minimize the electric and thermal field stresses in the insulation system. The results for one particular machine type are evaluated by analyzing the solution data to characterize the overall general OCP system behavior.
{"title":"Investigation of Ideal Anisotropic Material Properties for Outer Corona Protection Systems in Large Rotating Machines","authors":"A. Staubach, G. Schmidt, F. Pohlmann, H. Hirsch","doi":"10.1109/EIC.2018.8481019","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481019","url":null,"abstract":"An essential component of the insulation system of large electric machines is the corona protection system. One important parameter in particular of the outer corona protection (OCP) is the ohmic resistance together with service related current and potential distributions as well as locally generated power losses. These parameters can be calculated and analyzed using finite element method (FEM). In this study the influence of the OCP material parameters on the electric field distributions in the insulation system are investigated. Real wrapped insulation system structures are modeled with a high level of detail by consideration of anisotropic material characteristics. A new approach to assess the ideal anisotropic OCP material properties is introduced with the process of the swarm optimization algorithm. The results of these examinations are used for the development of an ideal OCP system with the aim to minimize the electric and thermal field stresses in the insulation system. The results for one particular machine type are evaluated by analyzing the solution data to characterize the overall general OCP system behavior.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129519370","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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