Pub Date : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526092
Xianwu Zeng, Shengfu Li, Disheng Wang
A self-powered inrush current measurement system based on the electromagnetic induction principle is proposed. Signal coil and power harvesting coil adopt Rogowski coils, which are nested in the current channel. Power supply unit draw out energy from inrush current. After signal conditioning, polarity, peak value and occurrence time of transient surge current can be acquired. The current information can be power-down stored, and wireless data transmission is achieved through ZigBee protocol. Experiments prove that the system can be self-powered by inrush current and realize linear measurement within the range of 10kA to 200kA.
{"title":"A Self-powered Wireless Inrush Current Measurement System","authors":"Xianwu Zeng, Shengfu Li, Disheng Wang","doi":"10.1109/DIAGNOSTIKA.2018.8526092","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526092","url":null,"abstract":"A self-powered inrush current measurement system based on the electromagnetic induction principle is proposed. Signal coil and power harvesting coil adopt Rogowski coils, which are nested in the current channel. Power supply unit draw out energy from inrush current. After signal conditioning, polarity, peak value and occurrence time of transient surge current can be acquired. The current information can be power-down stored, and wireless data transmission is achieved through ZigBee protocol. Experiments prove that the system can be self-powered by inrush current and realize linear measurement within the range of 10kA to 200kA.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115672917","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526097
Ramy S. A. Afia, E. Mustafa, Z. A. Tamus
The usage of polymer materials as the main insulating material for many electrical apparatuses has been dramatically increased since its first introduction for more than 40 years ago. Thanks to the great advantages of polymer materials, nowadays the polymer materials like the Poly Ethylene (PE), Ethylene Propylene Rubber (EPR) and the Cross-Linked Poly Ethylene (XLPE) are the common material used for the insulation purposes for low, medium and high voltage levels such as cables. The insulation is a very critical part that affects greatly the operation of all equipment. The polymer materials used for insulation are subjected to many stresses which have a notable effect on the characteristics of these materials. These stresses are not only electrical, thermal and environmental but also they suffer from different types of mechanical stresses. Since understanding the effect of the different stresses on the polymer insulating materials is a must then, this paper gives a brief review on the effect of mechanical stresses on these materials which is still out of reach.
{"title":"Mechanical Stresses on Polymer Insulating Materials","authors":"Ramy S. A. Afia, E. Mustafa, Z. A. Tamus","doi":"10.1109/DIAGNOSTIKA.2018.8526097","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526097","url":null,"abstract":"The usage of polymer materials as the main insulating material for many electrical apparatuses has been dramatically increased since its first introduction for more than 40 years ago. Thanks to the great advantages of polymer materials, nowadays the polymer materials like the Poly Ethylene (PE), Ethylene Propylene Rubber (EPR) and the Cross-Linked Poly Ethylene (XLPE) are the common material used for the insulation purposes for low, medium and high voltage levels such as cables. The insulation is a very critical part that affects greatly the operation of all equipment. The polymer materials used for insulation are subjected to many stresses which have a notable effect on the characteristics of these materials. These stresses are not only electrical, thermal and environmental but also they suffer from different types of mechanical stresses. Since understanding the effect of the different stresses on the polymer insulating materials is a must then, this paper gives a brief review on the effect of mechanical stresses on these materials which is still out of reach.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125281817","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 : 2018-09-01DOI: 10.1109/diagnostika.2018.8526089
{"title":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","authors":"","doi":"10.1109/diagnostika.2018.8526089","DOIUrl":"https://doi.org/10.1109/diagnostika.2018.8526089","url":null,"abstract":"","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128298633","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526023
M. Gutten, D. Korenčiak, Richard Janura, J. Hornak
This article is focused about for analyse moisture of power oil transformer by proposed electronic measuring system. Proposed system use time return voltage method (RVM). In the first sections of the paper is description of electronic proposal for measuring system. In the paper are presented connecting of power supply to the measurement system platform, power supply connecting of switching modules and connecting of high-voltage and rectifier part of the system. In the conclusion are the results which have mainly shows moisture content in distribution transformer.
{"title":"Analysis of transformer moisture by proposed electronic system using time method RVM","authors":"M. Gutten, D. Korenčiak, Richard Janura, J. Hornak","doi":"10.1109/DIAGNOSTIKA.2018.8526023","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526023","url":null,"abstract":"This article is focused about for analyse moisture of power oil transformer by proposed electronic measuring system. Proposed system use time return voltage method (RVM). In the first sections of the paper is description of electronic proposal for measuring system. In the paper are presented connecting of power supply to the measurement system platform, power supply connecting of switching modules and connecting of high-voltage and rectifier part of the system. In the conclusion are the results which have mainly shows moisture content in distribution transformer.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131649351","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526099
Lukas L. Korcak, D. F. Kavanagh
This paper focuses on accelerated aging methods for magnet wire. Reliability of electrical devices such as coils, motors, relays, solenoids and transformers is heavily dependent on the Electrical Insulation System (EIS). Accelerated aging methods are used to rapidly simulate the conditions in real life, which is typically years (20,000 hours) depending on the operating conditions. The purpose of accelerated aging is to bring lifetime of an EIS to hours, days or weeks. Shortening the lifetime of an EIS to such an extent, allows for the study of the insulation materials behavior as well as investigate ways to estimate the remaining useful life (RUL) for the purpose of predictive maintenance. Unexpected failures in operation processes, where redundancy is not present, can lead to high economical losses, machine downtime and often health and safety risks. Conditions, under which thermal aging methods are generally reported in the literature, typically neglect other factors, owing to the sheer complexity and interdependence of the multifaceted aging phenomena. This paper examines some existing thermal aging tests, which are currently used to obtain data for enamel degradation in order to try to better understand of how the thermal stresses degrade the EIS. Separation of these stresses, which the EIS operate under, can yield a better understanding of how each of the Thermal, the Electrical, the Ambient and the Mechanical (TEAM) stresses behave.
{"title":"Thermal Accelerated Aging Methods for Magnet Wire: A Review","authors":"Lukas L. Korcak, D. F. Kavanagh","doi":"10.1109/DIAGNOSTIKA.2018.8526099","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526099","url":null,"abstract":"This paper focuses on accelerated aging methods for magnet wire. Reliability of electrical devices such as coils, motors, relays, solenoids and transformers is heavily dependent on the Electrical Insulation System (EIS). Accelerated aging methods are used to rapidly simulate the conditions in real life, which is typically years (20,000 hours) depending on the operating conditions. The purpose of accelerated aging is to bring lifetime of an EIS to hours, days or weeks. Shortening the lifetime of an EIS to such an extent, allows for the study of the insulation materials behavior as well as investigate ways to estimate the remaining useful life (RUL) for the purpose of predictive maintenance. Unexpected failures in operation processes, where redundancy is not present, can lead to high economical losses, machine downtime and often health and safety risks. Conditions, under which thermal aging methods are generally reported in the literature, typically neglect other factors, owing to the sheer complexity and interdependence of the multifaceted aging phenomena. This paper examines some existing thermal aging tests, which are currently used to obtain data for enamel degradation in order to try to better understand of how the thermal stresses degrade the EIS. Separation of these stresses, which the EIS operate under, can yield a better understanding of how each of the Thermal, the Electrical, the Ambient and the Mechanical (TEAM) stresses behave.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133148566","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526121
S. Bang, S. Yoon, Yeong Ho Lee, Y. Lim, Y. Shin
Demands for diagnostic and monitoring techniques of corrosions on metallic reinforcements which increase the risk of collapse are rising as the number of aged structures are growing. The visual inspection performed in the regular diagnosis of the structures is insufficient to prevent the danger in advance because the corrosions are mainly generated in the interior. In this paper, we propose a new structural health monitoring method for the local and internal corrosion of the structures via time-frequency domain reflectometry (TFDR). The local corrosion can be detected and be localized by TFDR and two indicators for monitoring the corrosion are introduced. The indicators are verified by monitoring experiments of a local corrosion.
{"title":"Local Corrosion Monitoring of Prestressed Concrete Strand via Time-Frequency Domain Reflectometry","authors":"S. Bang, S. Yoon, Yeong Ho Lee, Y. Lim, Y. Shin","doi":"10.1109/DIAGNOSTIKA.2018.8526121","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526121","url":null,"abstract":"Demands for diagnostic and monitoring techniques of corrosions on metallic reinforcements which increase the risk of collapse are rising as the number of aged structures are growing. The visual inspection performed in the regular diagnosis of the structures is insufficient to prevent the danger in advance because the corrosions are mainly generated in the interior. In this paper, we propose a new structural health monitoring method for the local and internal corrosion of the structures via time-frequency domain reflectometry (TFDR). The local corrosion can be detected and be localized by TFDR and two indicators for monitoring the corrosion are introduced. The indicators are verified by monitoring experiments of a local corrosion.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123256099","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526101
P. Netolický, O. Tůmová, L. Kupka
Statistical control charts (SPCs) are part of the preventive tools of quality management. Shewhart control charts, which have many limitations, are often applied to evaluate statistical processes. Conventional diagnostics of the manufacturing process can simply fail using this method. For this reason, other procedures must also be used to enable efficient process control in the existing production conditions. The paper presents an overview of the types and properties of the control charts with the focus on their applicability. In addition, the current issues in the field of standardization based on the applicability of different types of control diagrams are mentioned as well.
{"title":"Types of control diagrams and their use in quality management","authors":"P. Netolický, O. Tůmová, L. Kupka","doi":"10.1109/DIAGNOSTIKA.2018.8526101","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526101","url":null,"abstract":"Statistical control charts (SPCs) are part of the preventive tools of quality management. Shewhart control charts, which have many limitations, are often applied to evaluate statistical processes. Conventional diagnostics of the manufacturing process can simply fail using this method. For this reason, other procedures must also be used to enable efficient process control in the existing production conditions. The paper presents an overview of the types and properties of the control charts with the focus on their applicability. In addition, the current issues in the field of standardization based on the applicability of different types of control diagrams are mentioned as well.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132635739","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526094
B. Dolník, I. Kolcunová, J. Briančin, M. Fabián
The insulator is one of the important elements of the transmission system that electrically separates and mechanically connects two points with different potentials. In presented contribution we are focused on the measurement of surface leakage current on the insulator model under various pollution conditions. To simulate environmental pollution, a conductive electrolyte layer with different conductivity was used. Experimental measurements on the physical model point to the fact that the most optimal frequency of the sine wave test voltage is 1 kHz. It has also been shown that surface leakage current is increasing as the degree of pollution increases, under wet conditions. Monitoring the leakage current along the surface of the external insulation may be used as an indicator of contamination of the external insulation.
{"title":"The Experimental Measurements of Surface Leakage Current on the Insulator Model","authors":"B. Dolník, I. Kolcunová, J. Briančin, M. Fabián","doi":"10.1109/DIAGNOSTIKA.2018.8526094","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526094","url":null,"abstract":"The insulator is one of the important elements of the transmission system that electrically separates and mechanically connects two points with different potentials. In presented contribution we are focused on the measurement of surface leakage current on the insulator model under various pollution conditions. To simulate environmental pollution, a conductive electrolyte layer with different conductivity was used. Experimental measurements on the physical model point to the fact that the most optimal frequency of the sine wave test voltage is 1 kHz. It has also been shown that surface leakage current is increasing as the degree of pollution increases, under wet conditions. Monitoring the leakage current along the surface of the external insulation may be used as an indicator of contamination of the external insulation.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"7 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132644402","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526096
A. Cimino, F. Jenau, C. Staubach, A. Mashkin, F. Pohlmann
A new approach for fault detection and analysis in the electrical insulation system of generator winding bars is used for visual investigation. This paper presents two series of measurements, each with two bars, under simultaneous electrical, thermal and mechanical stress. A mechanically dominated aging mechanism is investigated in combination with a variation in temperature, which has a high influence on the lifetime. As a result of the complex structure of the insulation system, structural changes are difficult to detect with terahertz technology.
{"title":"Analysis of fault detection in the electrical insulation system of rotating machines","authors":"A. Cimino, F. Jenau, C. Staubach, A. Mashkin, F. Pohlmann","doi":"10.1109/DIAGNOSTIKA.2018.8526096","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526096","url":null,"abstract":"A new approach for fault detection and analysis in the electrical insulation system of generator winding bars is used for visual investigation. This paper presents two series of measurements, each with two bars, under simultaneous electrical, thermal and mechanical stress. A mechanically dominated aging mechanism is investigated in combination with a variation in temperature, which has a high influence on the lifetime. As a result of the complex structure of the insulation system, structural changes are difficult to detect with terahertz technology.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132691947","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 : 2018-09-01DOI: 10.1109/DIAGNOSTIKA.2018.8526140
O. Šefl, M. Knenicky, R. Procházka
In the recent years, technological development gave rise to numerous systems that utilize power semiconductor devices. As much as these devices improve the performance of electrical systems, they also pollute the network with voltage distortions. A mutual interaction between switching pulses, emitted by power electronics, and passive parameters of power system produce high-frequency harmonics and oscillating impulses. Although there are quite strict rules that define the maximum levels of such distortions, they are still theoretically able to increase the electrical stress of some parts of the power network. The distortions could, therefore, accelerate the aging process of insulation systems, which would, among others, pose a threat to the stability of electrical networks. Recently, a new aging model that respects nonsinusoidal voltage stresses has been developed. The model introduces a trio of specific parameters to describe the shape of applied voltage stress. This model has been applied to polymeric insulation, but the validity of this model for other insulation materials has not been verified yet. For this purpose, laboratory measurements with oil filled transformer paper insulation samples were carried out in our research. Voltage-time characteristics of transformer insulation paper were measured and evaluated by Weibull distribution. Parameters of Weibull distribution were determined and discussed. The increased effect of nonstandard voltage stress on a life-time of paper insulation was detected. The experimental results were discussed with the calculated results of the theoretical aging model. Specific parameters of the mentioned model were also calculated and compared with other available research publications.
{"title":"Life-Time of Oil Filled Insulation Paper under Nonstandard Voltage Stresses","authors":"O. Šefl, M. Knenicky, R. Procházka","doi":"10.1109/DIAGNOSTIKA.2018.8526140","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526140","url":null,"abstract":"In the recent years, technological development gave rise to numerous systems that utilize power semiconductor devices. As much as these devices improve the performance of electrical systems, they also pollute the network with voltage distortions. A mutual interaction between switching pulses, emitted by power electronics, and passive parameters of power system produce high-frequency harmonics and oscillating impulses. Although there are quite strict rules that define the maximum levels of such distortions, they are still theoretically able to increase the electrical stress of some parts of the power network. The distortions could, therefore, accelerate the aging process of insulation systems, which would, among others, pose a threat to the stability of electrical networks. Recently, a new aging model that respects nonsinusoidal voltage stresses has been developed. The model introduces a trio of specific parameters to describe the shape of applied voltage stress. This model has been applied to polymeric insulation, but the validity of this model for other insulation materials has not been verified yet. For this purpose, laboratory measurements with oil filled transformer paper insulation samples were carried out in our research. Voltage-time characteristics of transformer insulation paper were measured and evaluated by Weibull distribution. Parameters of Weibull distribution were determined and discussed. The increased effect of nonstandard voltage stress on a life-time of paper insulation was detected. The experimental results were discussed with the calculated results of the theoretical aging model. Specific parameters of the mentioned model were also calculated and compared with other available research publications.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133319711","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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