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.2018.8646937
M. Neznakomova, L. Van Langenhove, D. Gospodinova
Capillar activity of nonwovens characterized their filtration ability. Widely used method for porous media characterization is experimental capillary rise method. Non-woven porous media textiles can be characterized by studying the kinetics of liquid rise within the pore spaces. It is well known that the porous structure of the non-woven fabric gives an advantage associated with the deeper penetration of the plasma into the treated material. The electrical and magnetic polarization of textile filaments carried out under atmospheric or lowered gas pressure is a useful method for changing their surface state. Experimental studies have been conducted to determine the capillary activity of porous non-woven filter PET (Polyethylene terephthalate) textile material by capillary rise after low temperature plasma treatment in vacuum. The aim of this study is to use the capillary activity changes as a measure for the type and the extent of modification of non-woven needle felted textile materials after their treatment in ionized media. In the present article, it has been shown that the capillary activity measurement of can be successfully used to analyze the changes occurring along with the physicochemical filament modification in the cold plasma medium.
{"title":"Capillar Activity of Non-woven Needle Felted Filters as a Measure of Their Degree of Modification","authors":"M. Neznakomova, L. Van Langenhove, D. Gospodinova","doi":"10.1109/BULEF.2018.8646937","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646937","url":null,"abstract":"Capillar activity of nonwovens characterized their filtration ability. Widely used method for porous media characterization is experimental capillary rise method. Non-woven porous media textiles can be characterized by studying the kinetics of liquid rise within the pore spaces. It is well known that the porous structure of the non-woven fabric gives an advantage associated with the deeper penetration of the plasma into the treated material. The electrical and magnetic polarization of textile filaments carried out under atmospheric or lowered gas pressure is a useful method for changing their surface state. Experimental studies have been conducted to determine the capillary activity of porous non-woven filter PET (Polyethylene terephthalate) textile material by capillary rise after low temperature plasma treatment in vacuum. The aim of this study is to use the capillary activity changes as a measure for the type and the extent of modification of non-woven needle felted textile materials after their treatment in ionized media. In the present article, it has been shown that the capillary activity measurement of can be successfully used to analyze the changes occurring along with the physicochemical filament modification in the cold plasma medium.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"54 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":"126850114","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.2018.8646924
V. Mladenov, V. Chobanov, E. Zafeiropoulos, V. Vita
This paper aims to clarify flexibility by summarizing the analytic frameworks that have recently emerged to measure operational flexibility. Flexibility has been identified as an essential property of power systems, and indices and metrics used to recognize and evaluate a power system flexibility are continually defined. In this paper some indices and metrics that have already been developed are briefly presented and discussed. Also different methods for enhancing the flexibility are presented in more details.
{"title":"Characterisation and evaluation of flexibility of electrical power system","authors":"V. Mladenov, V. Chobanov, E. Zafeiropoulos, V. Vita","doi":"10.1109/BULEF.2018.8646924","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646924","url":null,"abstract":"This paper aims to clarify flexibility by summarizing the analytic frameworks that have recently emerged to measure operational flexibility. Flexibility has been identified as an essential property of power systems, and indices and metrics used to recognize and evaluate a power system flexibility are continually defined. In this paper some indices and metrics that have already been developed are briefly presented and discussed. Also different methods for enhancing the flexibility are presented in more details.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"15 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":"127144240","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.2018.8646945
Y. Shopov, S. Filipova-Petrakieva, B. Boychev
In the paper, the results from the analysis of the working process of the residual current devices (RCD) in the frequencies over than 50 Hz (resp. 60 Hz), are presented. The main aim of the investigation is to estimate the applicability of the considered RCD in the systems including modern converting devices and its protective measures from the electric current breaking in the working frequencies over than 50 Hz (resp. 60 Hz). The paper finishes with conclusion remarks about advantages and disadvantages of the considered models of RCD.
{"title":"Investigation of residual current devices in high frequencies","authors":"Y. Shopov, S. Filipova-Petrakieva, B. Boychev","doi":"10.1109/BULEF.2018.8646945","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646945","url":null,"abstract":"In the paper, the results from the analysis of the working process of the residual current devices (RCD) in the frequencies over than 50 Hz (resp. 60 Hz), are presented. The main aim of the investigation is to estimate the applicability of the considered RCD in the systems including modern converting devices and its protective measures from the electric current breaking in the working frequencies over than 50 Hz (resp. 60 Hz). The paper finishes with conclusion remarks about advantages and disadvantages of the considered models of RCD.","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":"127190577","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：