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.2018.8646945
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}
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.2018.8646926
V. Dimitrov
In this paper, an approach for asynchronous drive testing at different control modes U = f(f) has been developed. Many tests have been carried out using a specialized laboratory simulator and the results obtained have been analyzed. The experimental verification of the approach proves its applicability in the choice of suitable frequency converter for drives in various fields of industry and transport: pre-invested funds can be restored by implementing optimal control mode and increased energy efficiency.
{"title":"Approach for choice of the asynchronous drive control mode to achieve optimal performance","authors":"V. Dimitrov","doi":"10.1109/bulef.2018.8646926","DOIUrl":"https://doi.org/10.1109/bulef.2018.8646926","url":null,"abstract":"In this paper, an approach for asynchronous drive testing at different control modes U = f(f) has been developed. Many tests have been carried out using a specialized laboratory simulator and the results obtained have been analyzed. The experimental verification of the approach proves its applicability in the choice of suitable frequency converter for drives in various fields of industry and transport: pre-invested funds can be restored by implementing optimal control mode and increased energy efficiency.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"70 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":"122546848","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.2018.8646920
I. Balabozov
The work presents the development of a microcontroller system prototype based on the platform “Arduino Uno”. The prototype has been used to perform experimental tests to determine the Joule integral of a fuse. The prototype relies on an indirect method of obtaining the results for the Joule integral.
{"title":"Prototype of a Microcontroller System for Defining Joule Integral of Fuse","authors":"I. Balabozov","doi":"10.1109/BULEF.2018.8646920","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646920","url":null,"abstract":"The work presents the development of a microcontroller system prototype based on the platform “Arduino Uno”. The prototype has been used to perform experimental tests to determine the Joule integral of a fuse. The prototype relies on an indirect method of obtaining the results for the Joule integral.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"68 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":"126352337","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.2018.8646958
G. Todorov
An investigation of copper and iron losses distribution in internal permanent magnet synchronous motor is presented. Two rotor configuration have been analyzed – with integral permanent magnet per pole and with a segmented magnet with one ferromagnetic rib in the pole middle. Maximum torque per ampere (MTPA) and iron loss minimization (ILM) control have been applied for both constructions. The influence of the rotor configuration and the control strategy on the loss distribution is shown.
{"title":"Loss distribution in IPMSM at different control strategy","authors":"G. Todorov","doi":"10.1109/BULEF.2018.8646958","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646958","url":null,"abstract":"An investigation of copper and iron losses distribution in internal permanent magnet synchronous motor is presented. Two rotor configuration have been analyzed – with integral permanent magnet per pole and with a segmented magnet with one ferromagnetic rib in the pole middle. Maximum torque per ampere (MTPA) and iron loss minimization (ILM) control have been applied for both constructions. The influence of the rotor configuration and the control strategy on the loss distribution is shown.","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":"124684519","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.2018.8646929
Valentin Kolev, Angel Georgiev, S. Sulakov
The reliability of the power system is divided into - adequacy and security. System adequacy relates to the existence of sufficient generators within the system to satisfy the consumer load demand or system operational constraints. This report presents a way of probabilistic modeling of available capacity in the generation subsystem. Under considerations are conventional generating units, cogenerations and different types of renewable energy sources.
{"title":"Probabilistic modelling of available capacity in the power system","authors":"Valentin Kolev, Angel Georgiev, S. Sulakov","doi":"10.1109/BULEF.2018.8646929","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646929","url":null,"abstract":"The reliability of the power system is divided into - adequacy and security. System adequacy relates to the existence of sufficient generators within the system to satisfy the consumer load demand or system operational constraints. This report presents a way of probabilistic modeling of available capacity in the generation subsystem. Under considerations are conventional generating units, cogenerations and different types of renewable energy sources.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"22 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":"125711495","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.2018.8646922
Daniel Dobrilov, Velichko Atanasov, P. Danchev
The paper examines an innovative approach to limit switching overvoltage’s from shunt reactors MV, which are installed in nodal distribution stations. This is done by changing the magnitude and nature of the switched current. The necessary electrical and technological protections, as well as their settings, are considered.
{"title":"Features in compensating reactive capacitive energy in medium voltage networks","authors":"Daniel Dobrilov, Velichko Atanasov, P. Danchev","doi":"10.1109/bulef.2018.8646922","DOIUrl":"https://doi.org/10.1109/bulef.2018.8646922","url":null,"abstract":"The paper examines an innovative approach to limit switching overvoltage’s from shunt reactors MV, which are installed in nodal distribution stations. This is done by changing the magnitude and nature of the switched current. The necessary electrical and technological protections, as well as their settings, are considered.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"12 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":"132699465","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.2018.8646925
I. Ivanov, Teodosi Tsankov
More and more using of the natural gas for energy, industrial and household purposes on one hand and the risk of accidents and risk for the safety and the human health during the operation of gas installations, using of gas pressured bottles and appliances, on other hand are the motivation for a survey and presentation of some outcomes in this paper. There are shown general review of the accidents, the main reasons for them, in particular related with electrical origin, descriptions of consequences for the safety and human health’ risk, and some lessons learned from the survey, in national level for Bulgaria after 2000.
{"title":"State Of The Art Safety And Human Health Risk Analysis Of Accidents With Gas Installations And Appliances, In Particular Related With Electrical Origin, In Buildings At Bulgaria","authors":"I. Ivanov, Teodosi Tsankov","doi":"10.1109/BULEF.2018.8646925","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646925","url":null,"abstract":"More and more using of the natural gas for energy, industrial and household purposes on one hand and the risk of accidents and risk for the safety and the human health during the operation of gas installations, using of gas pressured bottles and appliances, on other hand are the motivation for a survey and presentation of some outcomes in this paper. There are shown general review of the accidents, the main reasons for them, in particular related with electrical origin, descriptions of consequences for the safety and human health’ risk, and some lessons learned from the survey, in national level for Bulgaria after 2000.","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":"128292526","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.2018.8646930
I. Balabozov
In the present work a system using a microcontroller electronic platform in the realization of an experimental determination of a Joule integral of a fuse is presented. An algorithm is proposed based on which software has been developed and a working prototype of a microcontroller system is established.
{"title":"Experimental Research with Microcontroller System for Defining of Joule Integral of Fuse","authors":"I. Balabozov","doi":"10.1109/BULEF.2018.8646930","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646930","url":null,"abstract":"In the present work a system using a microcontroller electronic platform in the realization of an experimental determination of a Joule integral of a fuse is presented. An algorithm is proposed based on which software has been developed and a working prototype of a microcontroller system is established.","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":"128327313","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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