Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214584
M. Boroš, Filip Lenko
The electronic access control system is an integral part of the corporate culture across all types of organizations. In terms of safety, it is one of the alarm systems and due to their nature and importance, we consider them to be the most commonly used alarm systems in commercial practice. The primary role of the electronic access control system is to permit or deny persons or entities access to the protected or guarded area of the organization. Therefore, it is important to ensure that the electronic access control system and all its parts are correctly selected.The correct functionality and hence the reliability of the electronic access control system depends on the correct evaluation of the access request. Therefore, the design should take care to select the appropriate verification technology. In the past, radio communication was the most commonly used verification technology, but there is a trend in the use of biometric identification data. The reason for their considerable expansion is the efficiency and comfort of the verified person, as they do not need to carry any identification elements, i.e. cards and the like. For this reason, at the Faculty of Security Engineering, University of Žilina, we focused our research and experimental activities on the experimental testing of the reliability of biometric readers of electronic access control systems. We also paid attention to various non-standard attempts to overcome and thus unauthorized entry. For the efficiency of experimental testing and the involvement of individual components, we created a test structure in which the system components were mounted during the experiment. The paper points out the achieved value of the reliability of biometric readers of electronic input control systems from different perspectives.
{"title":"Importance of electronic access control systems and the need for their testing","authors":"M. Boroš, Filip Lenko","doi":"10.1109/Diagnostika49114.2020.9214584","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214584","url":null,"abstract":"The electronic access control system is an integral part of the corporate culture across all types of organizations. In terms of safety, it is one of the alarm systems and due to their nature and importance, we consider them to be the most commonly used alarm systems in commercial practice. The primary role of the electronic access control system is to permit or deny persons or entities access to the protected or guarded area of the organization. Therefore, it is important to ensure that the electronic access control system and all its parts are correctly selected.The correct functionality and hence the reliability of the electronic access control system depends on the correct evaluation of the access request. Therefore, the design should take care to select the appropriate verification technology. In the past, radio communication was the most commonly used verification technology, but there is a trend in the use of biometric identification data. The reason for their considerable expansion is the efficiency and comfort of the verified person, as they do not need to carry any identification elements, i.e. cards and the like. For this reason, at the Faculty of Security Engineering, University of Žilina, we focused our research and experimental activities on the experimental testing of the reliability of biometric readers of electronic access control systems. We also paid attention to various non-standard attempts to overcome and thus unauthorized entry. For the efficiency of experimental testing and the involvement of individual components, we created a test structure in which the system components were mounted during the experiment. The paper points out the achieved value of the reliability of biometric readers of electronic input control systems from different perspectives.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130382374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214648
J. Kúdelčík, Š. Hardoň, M. Gutten
Polarization and relaxation processes in a magnetic fluid can be characterized by the complex permittivity and dissipation factor. The change of these parameters and rearrangement of magnetic nanoparticles in an electric field and magnetic flux density were studied by dielectric spectroscopy. The frequency dependences of dielectric parameters were measured in a wide frequency range from 1 mHz to 10 kHz at a wide range of temperatures from −35 °C to 35 °C at the application of the magnetic flux density and the electric field by a capacitance method. The object of our study was the magnetic fluid based on transformer oil TO 40 A MOL with FeO·Fe2O3 magnetic nanoparticles. The development of the dissipation factor of studied magnetic fluid show one low-frequency relaxation maximum at the eigenfrequency, which was associated with the electric double-layer. The Cole-Cole relaxation model was used for analyzing measured data, and the activation energy from the Arrhenius plot was calculated.
磁流体中的极化和弛豫过程可以用复介电常数和耗散因子来表征。利用介电光谱研究了这些参数的变化以及磁性纳米颗粒在电场和磁通密度下的重排。在- 35℃~ 35℃的温度范围内，在1 mHz ~ 10 kHz的宽频率范围内，用电容法测量了电介质参数在磁感应强度和电场作用下的频率依赖性。本研究以变压器油TO 40 A MOL为基材，制备了FeO·Fe2O3磁性纳米颗粒磁性流体。研究磁流体耗散系数的发展表明，在本征频率处存在一个低频弛豫最大值，这与双电层有关。采用Cole-Cole松弛模型对实测数据进行分析，计算Arrhenius图的活化能。
{"title":"Dielectric spectroscopy of magnetic fluid based on transformer oil","authors":"J. Kúdelčík, Š. Hardoň, M. Gutten","doi":"10.1109/Diagnostika49114.2020.9214648","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214648","url":null,"abstract":"Polarization and relaxation processes in a magnetic fluid can be characterized by the complex permittivity and dissipation factor. The change of these parameters and rearrangement of magnetic nanoparticles in an electric field and magnetic flux density were studied by dielectric spectroscopy. The frequency dependences of dielectric parameters were measured in a wide frequency range from 1 mHz to 10 kHz at a wide range of temperatures from −35 °C to 35 °C at the application of the magnetic flux density and the electric field by a capacitance method. The object of our study was the magnetic fluid based on transformer oil TO 40 A MOL with FeO·Fe2O3 magnetic nanoparticles. The development of the dissipation factor of studied magnetic fluid show one low-frequency relaxation maximum at the eigenfrequency, which was associated with the electric double-layer. The Cole-Cole relaxation model was used for analyzing measured data, and the activation energy from the Arrhenius plot was calculated.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121282455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214727
T. Graef, M. Menge, Moritz Kölling, Thomas Zamzow, G. Heidmann, K. Vaterrodt
Fiber optic sensor systems are presented for detection of acoustic and optic partial discharges at cable connectors and high energy transmission systems. Applications to the photonic detection of partial discharges are shown. Signal processing is applied for automated identification of defined patterns to separate partial discharges from noise for online monitoring and compared with conventional electrical partial discharge measurement.
{"title":"Nonconventional Partial Discharge Measurement using Fiber Optic Sensor System for Transmission Systems And Switchgear","authors":"T. Graef, M. Menge, Moritz Kölling, Thomas Zamzow, G. Heidmann, K. Vaterrodt","doi":"10.1109/Diagnostika49114.2020.9214727","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214727","url":null,"abstract":"Fiber optic sensor systems are presented for detection of acoustic and optic partial discharges at cable connectors and high energy transmission systems. Applications to the photonic detection of partial discharges are shown. Signal processing is applied for automated identification of defined patterns to separate partial discharges from noise for online monitoring and compared with conventional electrical partial discharge measurement.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126116896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214585
V. Belko, O. Emelyanov, I. Ivanov, Victor Starovoytenkov
A typical approach to minimizing the early failures (“infant mortality”) of the modern metallized film capacitors (MFCs) is to conduct a burn-in test at applied voltage slightly more (at 30 – 50%) than nominal value. During the test, an external capacitor bank is used as a capacitive storage device with an energy significantly exceeding the energy level of the capacitor under the test. Thus, the amount of energy in the self-healing (SH) process is practically unlimited, which may lead to catastrophic failure of the capacitor. Recently, the soft training test for application of such capacitors in overload modes has been proposed. This can significantly improve the MFCs technical characteristics. We present the results of experimental and theoretical study on SH processes of MFCs in soft training test, allowing the capacitors to operate at voltages 3 – 5 times higher than nominal value. The MFC’s degradation is associated with the equivalent parallel resistance (EPR) decreasing due to numerous SH events. On the base of the developed physical model, the relationship between critical value of testing voltage and EPR as a diagnostic parameter is offered.
{"title":"The Diagnostics of Metallized Film Capacitors under Soft Training Test","authors":"V. Belko, O. Emelyanov, I. Ivanov, Victor Starovoytenkov","doi":"10.1109/Diagnostika49114.2020.9214585","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214585","url":null,"abstract":"A typical approach to minimizing the early failures (“infant mortality”) of the modern metallized film capacitors (MFCs) is to conduct a burn-in test at applied voltage slightly more (at 30 – 50%) than nominal value. During the test, an external capacitor bank is used as a capacitive storage device with an energy significantly exceeding the energy level of the capacitor under the test. Thus, the amount of energy in the self-healing (SH) process is practically unlimited, which may lead to catastrophic failure of the capacitor. Recently, the soft training test for application of such capacitors in overload modes has been proposed. This can significantly improve the MFCs technical characteristics. We present the results of experimental and theoretical study on SH processes of MFCs in soft training test, allowing the capacitors to operate at voltages 3 – 5 times higher than nominal value. The MFC’s degradation is associated with the equivalent parallel resistance (EPR) decreasing due to numerous SH events. On the base of the developed physical model, the relationship between critical value of testing voltage and EPR as a diagnostic parameter is offered.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116806531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214776
M. Kučera, M. Šebok, M. Gutten, Viktor Cefer, M. Kubiš
In the first part of paper is presented theoretical analyses electromagnetic compatibility (EMC) and in the second part is showed experimental measurement of radiation effects of high-voltage transformers and their possible impact for electronic devices of control room. Measurements and diagnostics were performed in the control room in a very high voltage substation. The state of electromagnetic radiation and the state of EMC were analyzed. Measurements of the effects of magnetic and electric fields on electronic devices were performed. Numerical data processing was used for Fourier analysis and analyzed in the spectral area.
{"title":"Measurement of Electromagnetic Radiation from Power Transformers","authors":"M. Kučera, M. Šebok, M. Gutten, Viktor Cefer, M. Kubiš","doi":"10.1109/Diagnostika49114.2020.9214776","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214776","url":null,"abstract":"In the first part of paper is presented theoretical analyses electromagnetic compatibility (EMC) and in the second part is showed experimental measurement of radiation effects of high-voltage transformers and their possible impact for electronic devices of control room. Measurements and diagnostics were performed in the control room in a very high voltage substation. The state of electromagnetic radiation and the state of EMC were analyzed. Measurements of the effects of magnetic and electric fields on electronic devices were performed. Numerical data processing was used for Fourier analysis and analyzed in the spectral area.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132787085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214757
Ramy S. A. Afia, E. Mustafa, Z. A. Tamus
Cable systems have an important role in the reliability and efficiency of photovoltaic systems. The insulation integrity of these cables relies on many factors such as manufacturing processes, operating conditions, the factors causing insulation degradation. Polymeric insulating materials are widely adopted as main insulation for many applications. In this research, low voltage photovoltaic cable samples based Cross-Linked Polyolefin (XLPO) insulation were investigated using the polarisation and depolarization current method. Accelerated aging tests were executed where the cable samples have been subjected to simultaneous thermal and mechanical stresses for different periods. The results showed a small changes in the polarisation and depolarisation currents with aging. In addition, the conduction current has slightly decreased.
{"title":"Condition Assessment of XLPO Insulated Photovoltaic Cables Based on Polarisation/Depolarisation Current","authors":"Ramy S. A. Afia, E. Mustafa, Z. A. Tamus","doi":"10.1109/Diagnostika49114.2020.9214757","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214757","url":null,"abstract":"Cable systems have an important role in the reliability and efficiency of photovoltaic systems. The insulation integrity of these cables relies on many factors such as manufacturing processes, operating conditions, the factors causing insulation degradation. Polymeric insulating materials are widely adopted as main insulation for many applications. In this research, low voltage photovoltaic cable samples based Cross-Linked Polyolefin (XLPO) insulation were investigated using the polarisation and depolarization current method. Accelerated aging tests were executed where the cable samples have been subjected to simultaneous thermal and mechanical stresses for different periods. The results showed a small changes in the polarisation and depolarisation currents with aging. In addition, the conduction current has slightly decreased.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131562249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214642
E. Pagger, M. Muhr, K. Rapp, N. Pattanadech
In recent years, more and more transformers filled with esters have been put into operation. This is because people recognize the benefits of ester fluids in terms of their fire safety (high flash- and fire points) and environmental characteristics, judging from their biodegradability, their low CO2 footprint (only valid for natural ester) and their beneficial interactions with solid insulation, etc. Ester fluids have already found their way into various standards. For analysis and testing the same equipment and devices that are commonly used for mineral oil are used for ester liquid. The chemical- and physical behaviors of ester fluids compared to mineral oil are different. This must always be considered when interpreting test results stemming from ester fluids.
{"title":"Alternative Insulating Fluids – Interpretation of Test Results","authors":"E. Pagger, M. Muhr, K. Rapp, N. Pattanadech","doi":"10.1109/Diagnostika49114.2020.9214642","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214642","url":null,"abstract":"In recent years, more and more transformers filled with esters have been put into operation. This is because people recognize the benefits of ester fluids in terms of their fire safety (high flash- and fire points) and environmental characteristics, judging from their biodegradability, their low CO2 footprint (only valid for natural ester) and their beneficial interactions with solid insulation, etc. Ester fluids have already found their way into various standards. For analysis and testing the same equipment and devices that are commonly used for mineral oil are used for ester liquid. The chemical- and physical behaviors of ester fluids compared to mineral oil are different. This must always be considered when interpreting test results stemming from ester fluids.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115674258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214603
C. Boonseng, Rapeepornpat Boonseng, K. Kularbphettong
This paper presents a case study of failure analysis for a 200kVA, 400 V isolation transformer at a semiconductor plant with a start-up with problems faced before permanent damage. The basic requirements of the acceleration of the dynamic transformer to achieve a successful start will be checked In addition, the results of the measurement of the location of the electrical parameters and the separation process are shown to indicate the cause of the error and evidence of the testimony. The results are confirmed by a failure analysis report provided by the manufacturer. This paper also addresses the obstacles that are faced due to the limited error and availability of information and how to solve the problem.
{"title":"The Low Voltage Isolation Transformer Failure Investigation: Measurements, Analysis and Lessons Learned","authors":"C. Boonseng, Rapeepornpat Boonseng, K. Kularbphettong","doi":"10.1109/Diagnostika49114.2020.9214603","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214603","url":null,"abstract":"This paper presents a case study of failure analysis for a 200kVA, 400 V isolation transformer at a semiconductor plant with a start-up with problems faced before permanent damage. The basic requirements of the acceleration of the dynamic transformer to achieve a successful start will be checked In addition, the results of the measurement of the location of the electrical parameters and the separation process are shown to indicate the cause of the error and evidence of the testimony. The results are confirmed by a failure analysis report provided by the manufacturer. This paper also addresses the obstacles that are faced due to the limited error and availability of information and how to solve the problem.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128066927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/diagnostika49114.2020.9214763
{"title":"Diagnostika 2020 Cover Page","authors":"","doi":"10.1109/diagnostika49114.2020.9214763","DOIUrl":"https://doi.org/10.1109/diagnostika49114.2020.9214763","url":null,"abstract":"","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131248884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214656
P. Żukowski, K. Kierczyński, P. Rogałski, J. Subocz, M. Zenker, M. Gutten, D. Korenčiak
The article examined an temperature effect on the analysis for AC relaxation time of a dumped a material cellulose with synthetic ester and nanoparticles from water with a content of humidity of 5% from weight. It was established that in the range of temperature 253 – 323K, the relaxation time of activation energy is ΔE≈(0.752±0.0268)eV.
{"title":"Analysis of the activation energy of the AC relaxation time of electrotechnical pressboard - synthetic ester - water nanoparticle","authors":"P. Żukowski, K. Kierczyński, P. Rogałski, J. Subocz, M. Zenker, M. Gutten, D. Korenčiak","doi":"10.1109/Diagnostika49114.2020.9214656","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214656","url":null,"abstract":"The article examined an temperature effect on the analysis for AC relaxation time of a dumped a material cellulose with synthetic ester and nanoparticles from water with a content of humidity of 5% from weight. It was established that in the range of temperature 253 – 323K, the relaxation time of activation energy is ΔE≈(0.752±0.0268)eV.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129927000","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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