Pub Date : 2018-09-01DOI: 10.1109/BULEF.2018.8646960
Valentin Kolev, S. Sulakov
During the summer heats, the power system loads reach winter peaks values due to the air-conditioning. In the same time the routine network maintenance is at its culmination, respectively the network resistance is lower than the winter values. As result, during two years of experience in forecasting hourly transmission losses an increasing is detected when extreme heats are happen. In order to detect accurately losses dependence on combination between network maintenance and summer heats, statistical techniques are applied. Finally, the existing forecasting model of the transmission system operator is upgraded.
{"title":"The transmission losses increasing during the summer network maintenance","authors":"Valentin Kolev, S. Sulakov","doi":"10.1109/BULEF.2018.8646960","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646960","url":null,"abstract":"During the summer heats, the power system loads reach winter peaks values due to the air-conditioning. In the same time the routine network maintenance is at its culmination, respectively the network resistance is lower than the winter values. As result, during two years of experience in forecasting hourly transmission losses an increasing is detected when extreme heats are happen. In order to detect accurately losses dependence on combination between network maintenance and summer heats, statistical techniques are applied. Finally, the existing forecasting model of the transmission system operator is upgraded.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129195258","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 : 2018-09-01DOI: 10.1109/BULEF.2018.8646939
Yavor Lozanov, S. Tzvetkova
The results from processing of thermographic images, obtained during a thermographic study of a pumping station electrical equipment, are presented in the paper.
本文介绍了对某泵站电气设备进行热成像研究时所获得的热成像图像进行处理的结果。
{"title":"Processing of thermographic images","authors":"Yavor Lozanov, S. Tzvetkova","doi":"10.1109/BULEF.2018.8646939","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646939","url":null,"abstract":"The results from processing of thermographic images, obtained during a thermographic study of a pumping station electrical equipment, are presented in the paper.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133611528","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 : 2018-09-01DOI: 10.1109/BULEF.2018.8646933
M. Mehmed-Hamza, Plamen Stanchev
The Ac Time Overcurrent Relay (51) and the Instantaneous Overcurrent Relay (50) protections are the most commonly used relay protections in Bulgaria against phase-to-phase faults in the 20 kV medium voltage electric power lines. These protections are also used and against external short circuit faults in the supply power transformer. In recent years, particular attention has been paid to the continuity and the security of the electric power supply of the costumers, which in turn leads to increased requirements for relay protections regarding their performance, selectivity and sensitivity. The coordination of the settings of the relay protections of the power system elements has an important meaning for normal operation of the electric power system. The paper presents the coordination of the settings of the relay protection against phase-to-phase faults of the power lines with the most used cross sections of the conductors 20 kV and for power transformers 16, 25, 31.5 and 40 MVA.
{"title":"Coordination of the relay protection settings against phase to phase faults in electric power lines 20 kV","authors":"M. Mehmed-Hamza, Plamen Stanchev","doi":"10.1109/BULEF.2018.8646933","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646933","url":null,"abstract":"The Ac Time Overcurrent Relay (51) and the Instantaneous Overcurrent Relay (50) protections are the most commonly used relay protections in Bulgaria against phase-to-phase faults in the 20 kV medium voltage electric power lines. These protections are also used and against external short circuit faults in the supply power transformer. In recent years, particular attention has been paid to the continuity and the security of the electric power supply of the costumers, which in turn leads to increased requirements for relay protections regarding their performance, selectivity and sensitivity. The coordination of the settings of the relay protections of the power system elements has an important meaning for normal operation of the electric power system. The paper presents the coordination of the settings of the relay protection against phase-to-phase faults of the power lines with the most used cross sections of the conductors 20 kV and for power transformers 16, 25, 31.5 and 40 MVA.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114343726","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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