Pub Date : 2020-09-01DOI: 10.1109/Diagnostika49114.2020.9214728
T. Blenk, C. Weindl, T. Hertlein, A. Bauer, I. Mladenovic
A novel cluster-based procedure and control principle is presented, which allows a fundamental reduction of the transmitted power down to the economic and technical minimum. The resulting, locally restricted energy use is achieved by a cluster-based approach to central assets and by a hierarchically accumulated monetary motivation of participants within the energy system. Local incentives are used to motivate grid-serving behavior, which result from the interaction of instantaneous power flow measurements and the ageing behavior, based on an asset management analysis. By accumulating the local incentives, it is also possible to influence energy flows among several clusters. This can be done with a data exchange which is reduced to a minimum.
{"title":"Load Control through Incentive Regulation based on Asset Management","authors":"T. Blenk, C. Weindl, T. Hertlein, A. Bauer, I. Mladenovic","doi":"10.1109/Diagnostika49114.2020.9214728","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214728","url":null,"abstract":"A novel cluster-based procedure and control principle is presented, which allows a fundamental reduction of the transmitted power down to the economic and technical minimum. The resulting, locally restricted energy use is achieved by a cluster-based approach to central assets and by a hierarchically accumulated monetary motivation of participants within the energy system. Local incentives are used to motivate grid-serving behavior, which result from the interaction of instantaneous power flow measurements and the ageing behavior, based on an asset management analysis. By accumulating the local incentives, it is also possible to influence energy flows among several clusters. This can be done with a data exchange which is reduced to a minimum.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"50 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":"123632153","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/diagnostika49114.2020.9214667
{"title":"Diagnostika 2020 Blank Page","authors":"","doi":"10.1109/diagnostika49114.2020.9214667","DOIUrl":"https://doi.org/10.1109/diagnostika49114.2020.9214667","url":null,"abstract":"","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"13 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114106465","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/Diagnostika49114.2020.9214774
M. Hirman, J. Navrátil, F. Steiner, A. Hamácek
This paper deals with reliability of soldered/glued joints on electrically conductive textile ribbons during the electrical current ageing. The soldering was realized with tin-bismuth solder paste by hand soldering with hot air. The gluing was realized by UV curable non-conductive adhesive. The electrical resistance of soldered/glued joints on ribbons before, during and after electrical current load was satisfactory. The experiment provided proof that soldered/glued SMD chip components onto electrically conductive textile ribbons is possible and these joints are still usable under the electrical current load. It follows that tested types of joints on ribbon can be recommended for future use.
{"title":"Comparison of Conductive Ribbons Reliability during Electrical Current Ageing","authors":"M. Hirman, J. Navrátil, F. Steiner, A. Hamácek","doi":"10.1109/Diagnostika49114.2020.9214774","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214774","url":null,"abstract":"This paper deals with reliability of soldered/glued joints on electrically conductive textile ribbons during the electrical current ageing. The soldering was realized with tin-bismuth solder paste by hand soldering with hot air. The gluing was realized by UV curable non-conductive adhesive. The electrical resistance of soldered/glued joints on ribbons before, during and after electrical current load was satisfactory. The experiment provided proof that soldered/glued SMD chip components onto electrically conductive textile ribbons is possible and these joints are still usable under the electrical current load. It follows that tested types of joints on ribbon can be recommended for future use.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"241 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":"133948935","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/Diagnostika49114.2020.9214595
U. Kaltenborn, Tobias Miessler
Distribution transformers undergo routine and type tests in accordance with IEC 60076 [1, 2, 3]. Amongst others, these tests include induced voltage tests combined with partial discharge (PD) measurement as well as measurement of no-load losses, load losses and short-circuit impedance.During its operation, transformer experiences operational stress and ageing processes. To be able to assess the condition of the transformer and to estimate its remaining lifetime, on-site tests are a helpful tool for transformer manufacturers as well as Distribution System Operators (DSOs) and their respective service suppliers.This paper describes a modular test system to carry out these tasks properly taking into consideration the potentially narrow installation of the test object.
{"title":"On-site testing and PD diagnosis of cast-resin distribution transformers","authors":"U. Kaltenborn, Tobias Miessler","doi":"10.1109/Diagnostika49114.2020.9214595","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214595","url":null,"abstract":"Distribution transformers undergo routine and type tests in accordance with IEC 60076 [1, 2, 3]. Amongst others, these tests include induced voltage tests combined with partial discharge (PD) measurement as well as measurement of no-load losses, load losses and short-circuit impedance.During its operation, transformer experiences operational stress and ageing processes. To be able to assess the condition of the transformer and to estimate its remaining lifetime, on-site tests are a helpful tool for transformer manufacturers as well as Distribution System Operators (DSOs) and their respective service suppliers.This paper describes a modular test system to carry out these tasks properly taking into consideration the potentially narrow installation of the test object.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"13 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":"131116073","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/Diagnostika49114.2020.9214657
A. Bezborodov, T. Shikova
The composite materials consisting of mica paper, fiber glass and epoxy resin are widely used for the insulation systems of large rotating machines. The combination of such materials creates the desired insulation system properties and protect material from being simultaneously subjected to thermal, electrical, chemical and mechanical stress. The special technological parameter of insulation - density (Pl) is introduced. Dependence of thermal (thermal conductivity) and electrical properties (Eps, tg δ and breakdown strength) of composite materials, which are commonly used in insulation systems for large rotating machines from the parameter Pl are discussed in this paper.
{"title":"Technological factors of insulation systems for large rotating machines: influence on thermal and electrical properties","authors":"A. Bezborodov, T. Shikova","doi":"10.1109/Diagnostika49114.2020.9214657","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214657","url":null,"abstract":"The composite materials consisting of mica paper, fiber glass and epoxy resin are widely used for the insulation systems of large rotating machines. The combination of such materials creates the desired insulation system properties and protect material from being simultaneously subjected to thermal, electrical, chemical and mechanical stress. The special technological parameter of insulation - density (Pl) is introduced. Dependence of thermal (thermal conductivity) and electrical properties (Eps, tg δ and breakdown strength) of composite materials, which are commonly used in insulation systems for large rotating machines from the parameter Pl are discussed in this paper.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"30 20","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120815964","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/Diagnostika49114.2020.9214671
V. Nikolić, R. Polanský
The paper summarizes the theoretical background of the accelerated aging test method of electrical insulating materials and its reliability by using the Arrhenius approach. Arrhenius equation presents generally accepted practice for assessing reliability, life-time, and degree of decomposition of a material. By demonstrating a typical aging experiment in electrical engineering, the paper explains the test design, selection method, and proof of the testing concept for measuring activation energy in practice. On the base of measured activation energy, the paper further deals with the evaluation of obtained data and their suitability for use in the Arrhenius equation. Moreover, the paper also observes the temperature dependence of different interaction rates among chemical reactions and its influence on the material during the thermal decomposition.
{"title":"Assessing the reliability of electrical insulating materials using accelerated aging tests","authors":"V. Nikolić, R. Polanský","doi":"10.1109/Diagnostika49114.2020.9214671","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214671","url":null,"abstract":"The paper summarizes the theoretical background of the accelerated aging test method of electrical insulating materials and its reliability by using the Arrhenius approach. Arrhenius equation presents generally accepted practice for assessing reliability, life-time, and degree of decomposition of a material. By demonstrating a typical aging experiment in electrical engineering, the paper explains the test design, selection method, and proof of the testing concept for measuring activation energy in practice. On the base of measured activation energy, the paper further deals with the evaluation of obtained data and their suitability for use in the Arrhenius equation. Moreover, the paper also observes the temperature dependence of different interaction rates among chemical reactions and its influence on the material during the thermal decomposition.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"11 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":"127426291","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/Diagnostika49114.2020.9214627
P. Veselý, Jaroslav Minář, A. Pražanová, O. Šefl, K. Dušek
The aim of this work was to evaluate the mechanical and thermomechanical properties of structures prepared by 3D printing from biodegradable thermoplastic polyester PLA (Polylactic Acid). PLA structures and their manufacture by 3D printing can be a cost-saving and ecological alternative to the current production of insulation systems, e.g. condenser bushings or substrates for printed circuit boards. For further practical application, the knowledge of the change of mechanical and thermal properties in dependence on process parameters is necessary. In this research, PLA test samples were first prepared at different printing speeds and nozzle temperatures. Then, they were characterized by thermomechanical analysis (TMA), dynamic mechanical analysis (DMA), and tensile tests. The data showed that the decrease of printing temperature remarkably increased the dimension change evaluated from TMA measurement of 3D printed structures. On the other hand, no significant differences were found between samples printed with different printing speeds. Our results should lead to a better understanding of how to set up the 3D printing process properly.
{"title":"Novel Electrical Insulation Materials – Mechanical Performance of 3D Printed Polylactic Acid","authors":"P. Veselý, Jaroslav Minář, A. Pražanová, O. Šefl, K. Dušek","doi":"10.1109/Diagnostika49114.2020.9214627","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214627","url":null,"abstract":"The aim of this work was to evaluate the mechanical and thermomechanical properties of structures prepared by 3D printing from biodegradable thermoplastic polyester PLA (Polylactic Acid). PLA structures and their manufacture by 3D printing can be a cost-saving and ecological alternative to the current production of insulation systems, e.g. condenser bushings or substrates for printed circuit boards. For further practical application, the knowledge of the change of mechanical and thermal properties in dependence on process parameters is necessary. In this research, PLA test samples were first prepared at different printing speeds and nozzle temperatures. Then, they were characterized by thermomechanical analysis (TMA), dynamic mechanical analysis (DMA), and tensile tests. The data showed that the decrease of printing temperature remarkably increased the dimension change evaluated from TMA measurement of 3D printed structures. On the other hand, no significant differences were found between samples printed with different printing speeds. Our results should lead to a better understanding of how to set up the 3D printing process properly.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"48 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":"127150592","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/Diagnostika49114.2020.9214664
D. Korenčiak, M. Gutten, Viktor Cefer, M. Šebok, N. Valko
In the 1-st part of article is presented theory about diagnostic methods for transformer construction (winding, taps and feromagnetic core). In the 2-nd part of article is presented experimental analysis of fault in winding of transformer by means of method of impact test and frequency response analysis (SFRA). For transformer diagnostics and analysis of winding quality are very important these methods by measurement in time and frequency domain using by impact test and method SFRA. Differences between measured frequency curves are analyzed by value of relative factor Rxy
{"title":"Diagnostics of Difference Parameters of Transformer Winding in Time and Frequency Domain","authors":"D. Korenčiak, M. Gutten, Viktor Cefer, M. Šebok, N. Valko","doi":"10.1109/Diagnostika49114.2020.9214664","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214664","url":null,"abstract":"In the 1-st part of article is presented theory about diagnostic methods for transformer construction (winding, taps and feromagnetic core). In the 2-nd part of article is presented experimental analysis of fault in winding of transformer by means of method of impact test and frequency response analysis (SFRA). For transformer diagnostics and analysis of winding quality are very important these methods by measurement in time and frequency domain using by impact test and method SFRA. Differences between measured frequency curves are analyzed by value of relative factor Rxy","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"34 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":"128772689","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/Diagnostika49114.2020.9214744
L. Stastný, R. Mego, J. Pihera, J. Hornak
The aim of this article is to verify the possibility of using inductive coupling for the on-line measurement of partial discharges MV cables. At its principle, inductive coupling records partial discharges that cause current changes over this coupling only. This natural selectivity can be used within on-line measurement, and, therefore, to restrain other partial discharges sources that can be found in MV system. That is why a new detection system based on the inductive coupling principle was designed and tested in laboratory conditions. In order to verify sensitivity and recording availability, basic partial discharges models (corona, surface, and internal) were prepared, and verifying measurement with standard PD Smart detecting system was realized. Based on measured and analyzed data, it is possible to state that this newly developed system has, at its disposal, parameters suitable for partial discharges detection.
{"title":"Selectivity of inductive coupling for partial discharge measurement in MV cables","authors":"L. Stastný, R. Mego, J. Pihera, J. Hornak","doi":"10.1109/Diagnostika49114.2020.9214744","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214744","url":null,"abstract":"The aim of this article is to verify the possibility of using inductive coupling for the on-line measurement of partial discharges MV cables. At its principle, inductive coupling records partial discharges that cause current changes over this coupling only. This natural selectivity can be used within on-line measurement, and, therefore, to restrain other partial discharges sources that can be found in MV system. That is why a new detection system based on the inductive coupling principle was designed and tested in laboratory conditions. In order to verify sensitivity and recording availability, basic partial discharges models (corona, surface, and internal) were prepared, and verifying measurement with standard PD Smart detecting system was realized. Based on measured and analyzed data, it is possible to state that this newly developed system has, at its disposal, parameters suitable for partial discharges detection.","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":"125569386","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/Diagnostika49114.2020.9214644
G. Csányi, Z. A. Tamus
As a result of various new appliances connecting to the low voltage grid (e.g. renewable power sources, electric vehicles etc.) the distribution grid has to face new challenges. Since the distributed power generation can cause reverse power flow, parts of the cables might become overloaded raising the temperature of the cable, hence decreasing its lifetime. In this paper the effect of short term thermal aging (3 and 6 hour long at 110°C) on PVC films were investigated by the Extended Voltage Response (EVR) measurement method and measuring Shore D hardness. The PVC samples contained four different plasticizer contents: 50, 40, 30 and 0 wt%. The results suggest that the EVR measurement method is a useful tool to follow the effect of short term aging.
{"title":"Effect of short term thermal aging on PVC films by the extended voltage response measurement method","authors":"G. Csányi, Z. A. Tamus","doi":"10.1109/Diagnostika49114.2020.9214644","DOIUrl":"https://doi.org/10.1109/Diagnostika49114.2020.9214644","url":null,"abstract":"As a result of various new appliances connecting to the low voltage grid (e.g. renewable power sources, electric vehicles etc.) the distribution grid has to face new challenges. Since the distributed power generation can cause reverse power flow, parts of the cables might become overloaded raising the temperature of the cable, hence decreasing its lifetime. In this paper the effect of short term thermal aging (3 and 6 hour long at 110°C) on PVC films were investigated by the Extended Voltage Response (EVR) measurement method and measuring Shore D hardness. The PVC samples contained four different plasticizer contents: 50, 40, 30 and 0 wt%. The results suggest that the EVR measurement method is a useful tool to follow the effect of short term aging.","PeriodicalId":428555,"journal":{"name":"2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"291 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":"133711373","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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