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Analysis of operation of transformer differential protection under current transformer saturation: Software simulations and relay testing 电流互感器饱和情况下变压器差动保护的运行分析:软件仿真和继电器试验
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2021-01-01 DOI: 10.5937/zeint31-35037
Nikola Sucevic, Saša Gligorov, Z. Stojanović
{"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}
引用次数: 0
Fuzzy logic expert system for assessing the condition of the HV motor stator insulation system 高压电机定子绝缘系统状态评估的模糊逻辑专家系统
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2021-01-01 DOI: 10.5937/zeint31-34709
D. Ilić, M. Žarković, M. Milić, Đorđe E Jovanović, Radmila Partonjić, Nikola Stanojević
{"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}
引用次数: 0
High-voltage motors on-site testing 高压电机现场测试
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2021-01-01 DOI: 10.5937/zeint31-34740
M. Milić, Đorđe E Jovanović, D. Ilić, Nikola Stanojević, Radmila Kališkić
{"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}
引用次数: 0
Characteristic example of insulation coordination in power converters 电力变流器中绝缘配合的典型实例
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2021-01-01 DOI: 10.5937/zeint31-34667
Z. Despotovic
{"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}
引用次数: 0
Application of the Heidler function in electromagnetic transients programs Heidler函数在电磁瞬变程序中的应用
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2021-01-01 DOI: 10.5937/zeint31-32982
J. Mrvić, Ranko Jasika, N. Simić
{"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}
引用次数: 0
Smart grids and power system reliability 智能电网与电力系统可靠性
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2021-01-01 DOI: 10.5937/zeint31-34940
Milica Dilparić-Cakić, M. Ristic
{"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}
引用次数: 0
Infrared sensors in special purpose technical assets 红外传感器中的特殊用途技术资产
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2021-01-01 DOI: 10.5937/zeint31-35005
Z. Milanović, S. Milić, R. Radovanovic
{"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}
引用次数: 0
Wide-band modelling of tower-footing grounding systems based on the impulse response measurement 基于脉冲响应测量的塔基接地系统宽带建模
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2019-01-01 DOI: 10.5937/zeint29-23610
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}
引用次数: 0
Analysis and modeling of the converter with active rectifier and its influence on energy efficiency of the electric drive 有源整流器变换器的分析与建模及其对电传动能效的影响
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2019-01-01 DOI: 10.5937/zeint29-22213
V. Sinik, Marko Šinik
{"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}
引用次数: 0
Assessment of harmful effects of RF fields in the vicinity of the antenna of digital radio modem 数字无线电调制解调器天线附近射频场有害影响评估
Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2019-01-01 DOI: 10.5937/zeint29-23771
S. Milić, Ljubiša Čičkarić, B. Vulević
{"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}
引用次数: 0
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