In the paper the analyses of the current transformer saturation influence to operation of differential protection are presented. Analyses are performed using a simulation tool and a relay model, as well as using the physical relay by injecting test currents from test equipment on relay inputs. The comparison of relay behavior in these two analyses has been performed and discussed. Network modeling has been performed in DIgSILENT PowerFactory and physical relay testing using DOBLE test equipment.
{"title":"Analysis of operation of transformer differential protection under current transformer saturation: Software simulations and relay testing","authors":"Nikola Sucevic, Saša Gligorov, Z. Stojanović","doi":"10.5937/zeint31-35037","DOIUrl":"https://doi.org/10.5937/zeint31-35037","url":null,"abstract":"In the paper the analyses of the current transformer saturation influence to operation of differential protection are presented. Analyses are performed using a simulation tool and a relay model, as well as using the physical relay by injecting test currents from test equipment on relay inputs. The comparison of relay behavior in these two analyses has been performed and discussed. Network modeling has been performed in DIgSILENT PowerFactory and physical relay testing using DOBLE test equipment.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"96 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74637771","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}
D. Ilić, M. Žarković, M. Milić, Đorđe E Jovanović, Radmila Partonjić, Nikola Stanojević
During operation, the electrical insulation system (EIS) of high-voltage motors is exposed to various factors that can accelerate its aging. Timely knowledge of the actual state of the EIS is of great help in allocating funds for service activities. The condition of the EIS of the HV motor can be assessed to some extent by performing available electrical tests. A major shortcoming is the lack of accuracy and the lack of well-defined criteria in the current standards. In that way, a potential error can bias the evaluation of recorded results. The paper proposes the use of a fuzzy logic expert system for assessing the condition of EIS stators of HV motors based on the results of electrical measurements. Also, the proposed fuzzy approach is fully discussed. The created expert system fully relies on the criteria defined in the IS32-Internal Standard of PE EPS.
高压电机电气绝缘系统在运行过程中受到各种因素的影响，加速其老化。及时了解环境影响报告书的实际情况，对为服务活动分配资金有很大帮助。通过进行现有的电气试验，可以在一定程度上评估高压电机的EIS状况。现行标准的一个主要缺点是缺乏准确性和缺乏明确定义的标准。这样，一个潜在的错误可能会使记录结果的评估产生偏差。本文提出了一种基于电气测量结果的模糊逻辑专家系统来评估高压电机EIS定子的状态。并对所提出的模糊方法进行了充分的讨论。所创建的专家系统完全依赖于is32 - PE EPS内部标准中定义的标准。
{"title":"Fuzzy logic expert system for assessing the condition of the HV motor stator insulation system","authors":"D. Ilić, M. Žarković, M. Milić, Đorđe E Jovanović, Radmila Partonjić, Nikola Stanojević","doi":"10.5937/zeint31-34709","DOIUrl":"https://doi.org/10.5937/zeint31-34709","url":null,"abstract":"During operation, the electrical insulation system (EIS) of high-voltage motors is exposed to various factors that can accelerate its aging. Timely knowledge of the actual state of the EIS is of great help in allocating funds for service activities. The condition of the EIS of the HV motor can be assessed to some extent by performing available electrical tests. A major shortcoming is the lack of accuracy and the lack of well-defined criteria in the current standards. In that way, a potential error can bias the evaluation of recorded results. The paper proposes the use of a fuzzy logic expert system for assessing the condition of EIS stators of HV motors based on the results of electrical measurements. Also, the proposed fuzzy approach is fully discussed. The created expert system fully relies on the criteria defined in the IS32-Internal Standard of PE EPS.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82066381","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}
M. Milić, Đorđe E Jovanović, D. Ilić, Nikola Stanojević, Radmila Kališkić
High-voltage motors are one of the most important components in thermal power plants and industrial facilities. However, they are often neglected in terms of preventive maintenance. Maintenance in power plants in Serbia still takes place according to the outdated model of maintenance based on fixed time intervals operations - time based maintenance. This is why emphasis has to be put on electrical testing of high-voltage motors in order to have a better insight into their condition, to prevent unwanted failures and to improve their service. This paper provides an overview of the currently available prophylactic tests of high-voltage motors. Also, the most common testing methods are described, which provide information on the current motor condition, so it is possible to make further repairs or corrective actions timely. Case examples and experiences from practice in power plants in Serbia are further presented and discussed in the paper.
{"title":"High-voltage motors on-site testing","authors":"M. Milić, Đorđe E Jovanović, D. Ilić, Nikola Stanojević, Radmila Kališkić","doi":"10.5937/zeint31-34740","DOIUrl":"https://doi.org/10.5937/zeint31-34740","url":null,"abstract":"High-voltage motors are one of the most important components in thermal power plants and industrial facilities. However, they are often neglected in terms of preventive maintenance. Maintenance in power plants in Serbia still takes place according to the outdated model of maintenance based on fixed time intervals operations - time based maintenance. This is why emphasis has to be put on electrical testing of high-voltage motors in order to have a better insight into their condition, to prevent unwanted failures and to improve their service. This paper provides an overview of the currently available prophylactic tests of high-voltage motors. Also, the most common testing methods are described, which provide information on the current motor condition, so it is possible to make further repairs or corrective actions timely. Case examples and experiences from practice in power plants in Serbia are further presented and discussed in the paper.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89768245","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}
Power electronics devices and modules that are most often used in power supply systems when compared to the passive components usually exhibit a very poor ability to withstand surge voltages. These surge voltages can be of different origins, and in most cases are transient surges. The recorded surge voltages even at low levels can lead to a damage of the mentioned power electronics devices or power converter components. Consequently, it is very important to implement a number of measures to increase the insulation level of the entire system. In this paper the two representative examples of insulation coordination are elaborated: i) an industrial AC drive and ii) photovoltaic inverter used in solar grid-connected power systems.
{"title":"Characteristic example of insulation coordination in power converters","authors":"Z. Despotovic","doi":"10.5937/zeint31-34667","DOIUrl":"https://doi.org/10.5937/zeint31-34667","url":null,"abstract":"Power electronics devices and modules that are most often used in power supply systems when compared to the passive components usually exhibit a very poor ability to withstand surge voltages. These surge voltages can be of different origins, and in most cases are transient surges. The recorded surge voltages even at low levels can lead to a damage of the mentioned power electronics devices or power converter components. Consequently, it is very important to implement a number of measures to increase the insulation level of the entire system. In this paper the two representative examples of insulation coordination are elaborated: i) an industrial AC drive and ii) photovoltaic inverter used in solar grid-connected power systems.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79113850","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}
The paper analyzes the possibility of using the Heidler function in programs for electromagnetic transients. The parameters of the Heidler function are calculated for various standard waveforms, where greater accuracy is shown for certain waves than with the use of parameters defined by the standard. The calculated parameters for the selected waveforms are presented in the table and the possibility of using the table to estimate the certain waveform parameters not given in the table is shown. Possible ways of applying the Heidler function in programs for electromagnetic transients are presented.
{"title":"Application of the Heidler function in electromagnetic transients programs","authors":"J. Mrvić, Ranko Jasika, N. Simić","doi":"10.5937/zeint31-32982","DOIUrl":"https://doi.org/10.5937/zeint31-32982","url":null,"abstract":"The paper analyzes the possibility of using the Heidler function in programs for electromagnetic transients. The parameters of the Heidler function are calculated for various standard waveforms, where greater accuracy is shown for certain waves than with the use of parameters defined by the standard. The calculated parameters for the selected waveforms are presented in the table and the possibility of using the table to estimate the certain waveform parameters not given in the table is shown. Possible ways of applying the Heidler function in programs for electromagnetic transients are presented.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"156 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76093965","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}
Smart grids and the reliability of the power system issues are discussed in the paper. Smart Grids have emerged as a mean to increase the efficiency of energy systems around the world. Based on the analysis of Smart Grid implementation, liberalization of the electricity market and system reliability, it is concluded that Smart Grid has not improved the reliability of the power system The reliability can be improved only by constant investment in production and capital plants of the system, with optimal use of smart grids.. The paper presents the case study of disintegration of the power system under calm weather conditions, and case of low quality of power delivery where smart grids did not help enough.
{"title":"Smart grids and power system reliability","authors":"Milica Dilparić-Cakić, M. Ristic","doi":"10.5937/zeint31-34940","DOIUrl":"https://doi.org/10.5937/zeint31-34940","url":null,"abstract":"Smart grids and the reliability of the power system issues are discussed in the paper. Smart Grids have emerged as a mean to increase the efficiency of energy systems around the world. Based on the analysis of Smart Grid implementation, liberalization of the electricity market and system reliability, it is concluded that Smart Grid has not improved the reliability of the power system The reliability can be improved only by constant investment in production and capital plants of the system, with optimal use of smart grids.. The paper presents the case study of disintegration of the power system under calm weather conditions, and case of low quality of power delivery where smart grids did not help enough.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84113214","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}
Special-purpose technical assets for measurement and monitoring are being rapidly developed with the goal of improving sustainable security and electronic protection of people and objects. A general division and application of intelligent infrared sensors in the security community is given in the paper. In a narrower sense, in the paper, a metrological overview of smart measuring sensors, devices, and systems is given. In a narrower sense, the paper analyses in detail the systems based on the use of thermal imaging cameras. A series of examples from world practice are given with the aim of illustrating the importance of measuring and monitoring IC systems use.
{"title":"Infrared sensors in special purpose technical assets","authors":"Z. Milanović, S. Milić, R. Radovanovic","doi":"10.5937/zeint31-35005","DOIUrl":"https://doi.org/10.5937/zeint31-35005","url":null,"abstract":"Special-purpose technical assets for measurement and monitoring are being rapidly developed with the goal of improving sustainable security and electronic protection of people and objects. A general division and application of intelligent infrared sensors in the security community is given in the paper. In a narrower sense, in the paper, a metrological overview of smart measuring sensors, devices, and systems is given. In a narrower sense, the paper analyses in detail the systems based on the use of thermal imaging cameras. A series of examples from world practice are given with the aim of illustrating the importance of measuring and monitoring IC systems use.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83680583","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}
Ranko Jasika, J. Mrvić, Stefan Obradović, N. Simić
{"title":"Wide-band modelling of tower-footing grounding systems based on the impulse response measurement","authors":"Ranko Jasika, J. Mrvić, Stefan Obradović, N. Simić","doi":"10.5937/zeint29-23610","DOIUrl":"https://doi.org/10.5937/zeint29-23610","url":null,"abstract":"","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79059941","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}
The aim of this paper is to present, analyse and demonstrate the benefits of using an active bidirectional rectifier as a front end converter in the variable speed drive converter of an electric motor. The use of an active bidirectional rectifier allows for more advanced
{"title":"Analysis and modeling of the converter with active rectifier and its influence on energy efficiency of the electric drive","authors":"V. Sinik, Marko Šinik","doi":"10.5937/zeint29-22213","DOIUrl":"https://doi.org/10.5937/zeint29-22213","url":null,"abstract":"The aim of this paper is to present, analyse and demonstrate the benefits of using an active bidirectional rectifier as a front end converter in the variable speed drive converter of an electric motor. The use of an active bidirectional rectifier allows for more advanced","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"385 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80752973","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}
{"title":"Assessment of harmful effects of RF fields in the vicinity of the antenna of digital radio modem","authors":"S. Milić, Ljubiša Čičkarić, B. Vulević","doi":"10.5937/zeint29-23771","DOIUrl":"https://doi.org/10.5937/zeint29-23771","url":null,"abstract":"","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84232423","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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