Zbornik Radova Elektrotehnicki Institut Nikola Tesla最新文献

Calculation of protection function settings of new elements of the 500 kV transmission system 500kv输电系统新元件保护功能整定计算

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41337

Nikola Sucevic

引用次数: 0

The examination of the specific thermal resistivity and moisture of cable bed in laboratory conditions 实验室条件下电缆床的比热电阻率和含水率的检测

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41463

N. Simić, Stefan Obradović

{"title":"The examination of the specific thermal resistivity and moisture of cable bed in laboratory conditions","authors":"N. Simić, Stefan Obradović","doi":"10.5937/zeint32-41463","DOIUrl":"https://doi.org/10.5937/zeint32-41463","url":null,"abstract":"This paper at first hand briefly presents examples of the maximum permitted current changes for one cable depending on the specific thermal resistance soil value rz. It is emphasized that the permanently permissible current load of the cable should be calculated using a constant value rz in design - Then, for two cases from field, two samples were examined. The first sample is undisturbed soil from the cable route and the second sample is specially prepared cable bed. The corresponding rz values were obtained using the needle probe method in the laboratory. The difference is pointed out between the measured values of specific thermal resistivity and moisture of the samples. Some samples were being dried in thermal chambers and the others were being dried on ambient temperature. For drying in thermal chambers, based on experience for cross-linked polyethylene cables, the temperatures of 60°C to 90°C were selected for the first case while in the second case the temperature of 20°C over a long period of time was applied. The results obtained were analyzed and shown in appropriate tables and graphs. At the end of this paper the moisture of the soil was calculated for sampled cable bed that corresponds to the value of rz of 1(Km/W). The composition of the cable bed that allows the designed value of the rated power of the cable to be achieved is proposed.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84055235","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

Computer model analysis of dynamic performances of the excitation control system when the load angle limiter is active 负载限角器激活时励磁控制系统动态性能的计算机模型分析

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41541

D. Joksimović, J. Dragosavac, Slavko Veinović, Đorđe M. Stojić, Milan Marinković, M. Đorđević

引用次数: 0

Application of the environmentally friendly technology for the removal of PCBs from mineral oils and power transformers to achieve very low values of PCBs for repair and materials recycling 应用环保技术，从矿物油和电力变压器中去除多氯联苯，以达到极低的多氯联苯含量，以便维修和物料回收

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41260

D. Mihajlović, J. Janković, V. Vasović, V. Ivancevic, J. Lukić

{"title":"Application of the environmentally friendly technology for the removal of PCBs from mineral oils and power transformers to achieve very low values of PCBs for repair and materials recycling","authors":"D. Mihajlović, J. Janković, V. Vasović, V. Ivancevic, J. Lukić","doi":"10.5937/zeint32-41260","DOIUrl":"https://doi.org/10.5937/zeint32-41260","url":null,"abstract":"The Republic of Serbia signed and ratified the Stockholm Convention on Persistent Organic Pollutants. Law on ratification of the Stockholm Convention was adopted and actions were defined through the National Implementation Plan and the Action Plan. On their basis Project Proper Management and Final Disposal of Polychlorinated Biphenyls (PCBs) was created. Institute Nikola Tesla (INT) participated in the realization of the project. In the period from 2015 to 2022, 601 tons of PCB oil was successfully decontaminated by the INT mobile plant, i.e. the PCB content was below 50 mg/kg, which classified the power transformers (PT) as non-contaminated [1,2]. If PT becomes waste or in case of necessary repair or oil regeneration, the required limit value is 10 mg/kg. According to data from INT database there are still 2637 PTs containing PCBs in the concentration range of 2 to 50 mg/kg. In this paper application of the environmentally closed INT decontamination technology for achieving low values of PCB in the oil is shown.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"134 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74695186","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 measures for reduction of magnetic flux density levels in the apartment located above the 10/0.4 kV transformer station 10/0.4 kV变电站以上公寓降低磁通密度水平措施的应用

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41601

Maja Grbić, A. Pavlović, Dejan Hrvić

引用次数: 0

The reliability of serial data communication using Uart-Usb converter Uart-Usb转换器串行数据通信的可靠性

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41677

Nikola Cakić, A. Zigic, Srđan Milosavljević

引用次数: 0

Insulation stresses of power equipment exposed to non-standard overvoltage waveforms 电力设备在非标准过电压波形下的绝缘应力

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41430

Ranko Jasika, J. Mrvić, Stefan Obradović

{"title":"Insulation stresses of power equipment exposed to non-standard overvoltage waveforms","authors":"Ranko Jasika, J. Mrvić, Stefan Obradović","doi":"10.5937/zeint32-41430","DOIUrl":"https://doi.org/10.5937/zeint32-41430","url":null,"abstract":"During its operation, electrical equipment is constantly exposed to overvoltages of various waveforms, such as lightning discharges, switching operations, faults, etc. Therefore, adequate selection of overvoltage protection and equipment insulation withstand voltages are key factors in increasing system reliability. In general, insulation coordination is carried out by analyzing the insulation behavior for standard impulse and switching overvoltage waveforms. However, overvoltages that occur in operating conditions can significantly deviate from the standard waveforms of insulation withstand voltages, in terms of the front time, the duration of the wave, the existence of highfrequency components as result of reflections in the facility and other factors. This paper presents possible methods of assessing the behavior of equipment insulation for real voltage waves to which the insulation is exposed during exploitation and which deviate from standard waveforms, by analysis in the frequency domain. As there are different components in the overvoltage signal at different frequencies, which a different energy, the main goal of this paper is to analyze the insulation characteristics of a specific transformer from the point of view of the energy spectral density of the voltage wave that occurs at its terminals when an atmospheric discharge occurs. The analysis is based on the determination of the safety margin on the entire frequency spectrum of the overvoltage wave, that is, on the calculation of the so-called FDSF (Frequency Domain Severity Factor). The calculation results show that although the overvoltage amplitude is lower than the withstand voltage of the transformer insulation with an appropriate safety margin (the condition of the classic approach to insulation coordination is satisfied), the spectrum analysis of the voltage wave in the frequency domain shows that the insulation may still be compromised.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"229 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74300408","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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Analysis of the possibility of a parallel resonant circuit in RHPP Bajina Bašta 巴吉纳RHPP并联谐振电路可能性分析Bašta

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41656

Milica Dilparić-Cakić, Branka Kovačević

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Nikola Tesla as a phenomenon in the world of science 尼古拉·特斯拉是科学界的一个现象

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-39893

V. Slavkovic

引用次数: 0

Algorithm of reactive power dispatching "per generator" realization on TPP Nikola Tesla A TPP上“每台发电机”无功调度实现算法

Zbornik Radova Elektrotehnicki Institut Nikola Tesla Pub Date : 2022-01-01 DOI: 10.5937/zeint32-41760

J. Pavlović, Bojan Radojičić, Lazar Stančić, J. Dragosavac, Sava Dobričić, Ž. Janda

{"title":"Algorithm of reactive power dispatching \"per generator\" realization on TPP Nikola Tesla A","authors":"J. Pavlović, Bojan Radojičić, Lazar Stančić, J. Dragosavac, Sava Dobričić, Ž. Janda","doi":"10.5937/zeint32-41760","DOIUrl":"https://doi.org/10.5937/zeint32-41760","url":null,"abstract":"The algorithm of reactive power dispatching \"per generator\" realization is presented in the paper. Dispatching \"per generator\" and \"per grid\" are two modes of reactive power dispatching used by coordinated reactive power and voltage regulator (GRRS). Reactive power dispatching \"per generator\" ensures equal heating of the generators, while dispatching \"per grid\" ensures maximal reactive power reserve when generated reactive power either increases, or decreases. Reactive power dispatching \"per generator\" is more complex for realization because the dispatching criterion may have wider generator's reactive power operation area than the working capability curve. In these cases, the additional limiting of the generator reactive power is necessary, while other generators take over the remaining reactive power, still considering the reactive power dispatching criteria \"per generator\" and the limits of the remaining generators. Both reactive power dispatching modes are presented in two examples, while operating near and far from the limit area. Eventually, as the verification of the algorithm and its realization, the operating results of GRRS while dispatching \"per generator\" is active, are presented.","PeriodicalId":31629,"journal":{"name":"Zbornik Radova Elektrotehnicki Institut Nikola Tesla","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85092608","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