Pub Date : 2018-09-01DOI: 10.1109/BULEF.2018.8646943
E. Dimitrova, Plamen Atanasov
Nowadays the quantitative estimation of risk is crucial in the realization of the so-called “risk systems”. Programs for simulation of the models of these systems exist, by which some of their dependability indices can be calculated. In this excerpt two software products are analysed as well as the possibilities for graphical representation of the results.
{"title":"Simulation of probabilistic models","authors":"E. Dimitrova, Plamen Atanasov","doi":"10.1109/BULEF.2018.8646943","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646943","url":null,"abstract":"Nowadays the quantitative estimation of risk is crucial in the realization of the so-called “risk systems”. Programs for simulation of the models of these systems exist, by which some of their dependability indices can be calculated. In this excerpt two software products are analysed as well as the possibilities for graphical representation of the results.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"4 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":"115546210","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.2018.8646936
K. Milanov, H. Antchev, Vanjo Gourgoulitsov, A. Andonov
The paper proposes an improvement of voltage quality in low voltage grids by means of a power electronic device built on the basis of a Series Active Power Filter. A block diagram has been presented and the operating modes have been described.
{"title":"A possibility for improving voltage quality intended for sensitive consumers","authors":"K. Milanov, H. Antchev, Vanjo Gourgoulitsov, A. Andonov","doi":"10.1109/BULEF.2018.8646936","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646936","url":null,"abstract":"The paper proposes an improvement of voltage quality in low voltage grids by means of a power electronic device built on the basis of a Series Active Power Filter. A block diagram has been presented and the operating modes have been described.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"61 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":"114707352","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.2018.8646944
D. Gospodinova, M. Neznakomova, P. Dineff
The end-use properties of polyester non-woven geotextiles can be determined by glow direct current plasma functionalization and ion-exchange activation. Plasma activation may be both the end-step for acquiring ion-exchange activation and a preliminary step in a chemical grafting for ion-exchangers creating, incorporation of particles, electrospun nanofibers or electrosputterd metal. Plasma activation may be related both production of nonwoven geotextiles with soil-friendly properties and non-woven ion exchangers for water purification and conditioning.
{"title":"Plasma Ion Exchange Activation of PET Eco-Friendly Needle-Punched Non-Woven Geotextiles","authors":"D. Gospodinova, M. Neznakomova, P. Dineff","doi":"10.1109/BULEF.2018.8646944","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646944","url":null,"abstract":"The end-use properties of polyester non-woven geotextiles can be determined by glow direct current plasma functionalization and ion-exchange activation. Plasma activation may be both the end-step for acquiring ion-exchange activation and a preliminary step in a chemical grafting for ion-exchangers creating, incorporation of particles, electrospun nanofibers or electrosputterd metal. Plasma activation may be related both production of nonwoven geotextiles with soil-friendly properties and non-woven ion exchangers for water purification and conditioning.","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":"125800186","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.2018.8646927
K. Gabrovska-Evstatieva, B. Evstatiev, Aleksandar Evtimov, N. Mihailov
An investigation regarding the opportunities to use photovoltaic energy for own need in residential buildings has been performed. The average monthly energy production of photovoltaic energy and energy consumption of a block of flats in Ruse (Bulgaria) are used to perform a cost-benefit analysis for different scenarios. The results showed that 6.7 kWp installed photovoltaic power would be optimal in terms of payback and installed power. Furthermore, the results led to the conclusion such installation is feasible and could be implemented on the roof of the building.
{"title":"Opportunities to Use Photovoltaic Energy in Residential Buildings","authors":"K. Gabrovska-Evstatieva, B. Evstatiev, Aleksandar Evtimov, N. Mihailov","doi":"10.1109/BULEF.2018.8646927","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646927","url":null,"abstract":"An investigation regarding the opportunities to use photovoltaic energy for own need in residential buildings has been performed. The average monthly energy production of photovoltaic energy and energy consumption of a block of flats in Ruse (Bulgaria) are used to perform a cost-benefit analysis for different scenarios. The results showed that 6.7 kWp installed photovoltaic power would be optimal in terms of payback and installed power. Furthermore, the results led to the conclusion such installation is feasible and could be implemented on the roof of the building.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"118 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":"127301273","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.2018.8646919
I. Balabozov
In the present work, the development of a system for precise control of polarized electromagnetic mechanisms is presented. The main purpose is to provide an opportunity to realize further enhancement of the efficiency of the studied devices. Experimental studies have also been carried out with the developed system, which are presented in a separate publication.
{"title":"Development of Energy Efficient Control System for Polarized Electromagnets","authors":"I. Balabozov","doi":"10.1109/BULEF.2018.8646919","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646919","url":null,"abstract":"In the present work, the development of a system for precise control of polarized electromagnetic mechanisms is presented. The main purpose is to provide an opportunity to realize further enhancement of the efficiency of the studied devices. Experimental studies have also been carried out with the developed system, which are presented in a separate publication.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"29 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":"121478512","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.2018.8646921
V. Mateev, Georgi Ivanov, I. Marinova
Here is developed a numerical approach in order to study the seismic behavior of different high voltage classes OIP transformer bushings for 123kV, 245kV and 420kV. The developed method is used to incorporate three different types of seismic modeling: random vibration, response spectrum and harmonic response analyzes, based on modal analysis results. The combination of finite element analyzes is done by Ansys-Workbench software. Results were obtained and analyzed for mechanical deformation, local accelerations and influence of modal shapes frequencies on vibration spectra during seismic events.
{"title":"Complex Seismic Analysis of High Voltage Bushings","authors":"V. Mateev, Georgi Ivanov, I. Marinova","doi":"10.1109/BULEF.2018.8646921","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646921","url":null,"abstract":"Here is developed a numerical approach in order to study the seismic behavior of different high voltage classes OIP transformer bushings for 123kV, 245kV and 420kV. The developed method is used to incorporate three different types of seismic modeling: random vibration, response spectrum and harmonic response analyzes, based on modal analysis results. The combination of finite element analyzes is done by Ansys-Workbench software. Results were obtained and analyzed for mechanical deformation, local accelerations and influence of modal shapes frequencies on vibration spectra during seismic events.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"11 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":"133518797","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.2018.8646949
V. Dimitrov
In this paper, an approach for asynchronous drive testing at different frequency converter parameter settings has been developed. Tests at different settings of the pulse-width modulation frequency were carried out using a specialized laboratory simulator to record the transient processes and the values of the controlled parameters in the steady-state operation. The results obtained have been analyzed to determine the impact of the examined parameter on the drive efficiency and dynamic performance. The experimental verification of the proposed approach proves its applicability in the setting of the frequency converters for drives in various fields of industry and transport.
{"title":"Approach for setting of pulse frequency to achieve optimal asynchronous drive performance","authors":"V. Dimitrov","doi":"10.1109/BULEF.2018.8646949","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646949","url":null,"abstract":"In this paper, an approach for asynchronous drive testing at different frequency converter parameter settings has been developed. Tests at different settings of the pulse-width modulation frequency were carried out using a specialized laboratory simulator to record the transient processes and the values of the controlled parameters in the steady-state operation. The results obtained have been analyzed to determine the impact of the examined parameter on the drive efficiency and dynamic performance. The experimental verification of the proposed approach proves its applicability in the setting of the frequency converters for drives in various fields of industry and transport.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"95 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":"125274265","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.2018.8646952
V. Dimitrov, Gulek Nedjib
In this paper, the contemporary devices for the construction of a SCADA system for remote control of power lines from the distribution network in the region of Sofia are presented and analyzed: indicators of fault currents (signaling devices), reclosers, outdoor load disconnectors, local control systems, etc. The implemented functions are described. Opportunities of monitoring and management by the Dispatcher Control Center are discussed.
{"title":"Peculiarities in construction of SCADA system for monitoring of electrical power supply networks","authors":"V. Dimitrov, Gulek Nedjib","doi":"10.1109/bulef.2018.8646952","DOIUrl":"https://doi.org/10.1109/bulef.2018.8646952","url":null,"abstract":"In this paper, the contemporary devices for the construction of a SCADA system for remote control of power lines from the distribution network in the region of Sofia are presented and analyzed: indicators of fault currents (signaling devices), reclosers, outdoor load disconnectors, local control systems, etc. The implemented functions are described. Opportunities of monitoring and management by the Dispatcher Control Center are discussed.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"27 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":"131010863","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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