{"title":"Influence of generator excitation system on generator under-impedance protection","authors":"Nikola Sucevic, S. Lukić","doi":"10.5937/zeint29-23935","DOIUrl":"https://doi.org/10.5937/zeint29-23935","url":null,"abstract":"","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74606072","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":"Evaluation of paper insulation of power transformers based on the content of 2-furfural in mineral oil corrected to a reference temperature of 20ºc","authors":"V. Vasović, D. Mihajlović, J. Janković, J. Lukić","doi":"10.5937/zeint29-23912","DOIUrl":"https://doi.org/10.5937/zeint29-23912","url":null,"abstract":"","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82378198","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}
Maja Grbić, M. Todorović, A. Pavlović, Dejan Hrvić
{"title":"Testing of high frequency electromagnetic field in the environment in the vicinity of base stations and radio and TV transmitters","authors":"Maja Grbić, M. Todorović, A. Pavlović, Dejan Hrvić","doi":"10.5937/zeint29-24285","DOIUrl":"https://doi.org/10.5937/zeint29-24285","url":null,"abstract":"","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"193 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72842094","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 presents an approach to testing old cable, damaged during atmospheric discharges. A description of the cable is given and a series of tests in the field is proposed in order to evaluate the cable insulation condition. First, the results of the insulation resistance and capacity obtained by the DC test voltage are given and explained. The results of the insulation resistance and capacitance tests as well as the values of the dielectric loss factor tgδ, obtained at sine wave voltage, frequencies of 0.1Hz (VLF), were then interpreted. The example shows a good value of tgδ as well as a breakthrough in cable insulation, and the characteristic changes in the measured cable parameters during the test are highlighted. The advantage of estimating the insulation state by measuring the dielectric loss factor method is emphasized. Finally, the importance of systematic data collection for a particular cable type and the ability to determine the residual life with minimum insulation stress are highlighted.
{"title":"Evaluation of 20 kV NPHO 13 cable insulation after damage caused by atmospheric discharges","authors":"N. Simić, J. Mrvić, Ranko Jasika","doi":"10.5937/zeint29-23862","DOIUrl":"https://doi.org/10.5937/zeint29-23862","url":null,"abstract":"The paper presents an approach to testing old cable, damaged during atmospheric discharges. A description of the cable is given and a series of tests in the field is proposed in order to evaluate the cable insulation condition. First, the results of the insulation resistance and capacity obtained by the DC test voltage are given and explained. The results of the insulation resistance and capacitance tests as well as the values of the dielectric loss factor tgδ, obtained at sine wave voltage, frequencies of 0.1Hz (VLF), were then interpreted. The example shows a good value of tgδ as well as a breakthrough in cable insulation, and the characteristic changes in the measured cable parameters during the test are highlighted. The advantage of estimating the insulation state by measuring the dielectric loss factor method is emphasized. Finally, the importance of systematic data collection for a particular cable type and the ability to determine the residual life with minimum insulation stress are highlighted.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84923919","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}
I. Klasnić, Dragan Belonić, Ž. Janda, J. Dragosavac, Z. Ćirić
Field winding temperature of the synchronous generator is one of limiting factors shaping generator PQ capability curve. Therefore of great operational importance is to have information about this temperature estimated with the utmost accuracy. It can be measured directly using built-in temperature sensors or determined indirectly. With the increasing penetration of renewable energy sources into the high-voltage transmission system, the fundamental changes happen in the way conventional generating units work, including hydrogenerators. They are facing the new operating modes characterized by rapid load changes and an increased number of start-stop cycles. These modes of operation lead to additional thermal stress of the hydrogenerator parts, including the rotor. In order to be able to respond to new demands that they are faced with, it is necessary to estimate the actual thermal capacity of the rotor and its influence on the dynamic hydrogenerator PQ capability curve.
{"title":"Estimation of hydrogenerator rotor dynamic thermal margine","authors":"I. Klasnić, Dragan Belonić, Ž. Janda, J. Dragosavac, Z. Ćirić","doi":"10.5937/zeint32-41740","DOIUrl":"https://doi.org/10.5937/zeint32-41740","url":null,"abstract":"Field winding temperature of the synchronous generator is one of limiting factors shaping generator PQ capability curve. Therefore of great operational importance is to have information about this temperature estimated with the utmost accuracy. It can be measured directly using built-in temperature sensors or determined indirectly. With the increasing penetration of renewable energy sources into the high-voltage transmission system, the fundamental changes happen in the way conventional generating units work, including hydrogenerators. They are facing the new operating modes characterized by rapid load changes and an increased number of start-stop cycles. These modes of operation lead to additional thermal stress of the hydrogenerator parts, including the rotor. In order to be able to respond to new demands that they are faced with, it is necessary to estimate the actual thermal capacity of the rotor and its influence on the dynamic hydrogenerator PQ capability curve.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"197 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75432257","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：