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Projects / Programmes source: ARIS

Analysis and design of selective miniature circuit breaker

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Research activity

Code Science Field Subfield
2.12.00  Engineering sciences and technologies  Electric devices   

Code Science Field
P200  Natural sciences and mathematics  Electromagnetism, optics, acoustics 
T190  Technological sciences  Electrical engineering 
Keywords
Miniature circuit braker, selective, numerical simulation, electromagnetic tripping unit
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (12)
no. Code Name and surname Research area Role Period No. of publications
1.  18751  PhD Edi Bulić  Systems and cybernetics  Researcher  2006 - 2008  0 
2.  12781  MSc Miran Dolinšek  Manufacturing technologies and systems  Researcher  2006 - 2008  0 
3.  06895  PhD Izidor Hafner  Computer intensive methods and applications  Researcher  2006 - 2008  0 
4.  04335  Jožica Hrastelj  Materials science and technology  Researcher  2006 - 2008  0 
5.  21055  Domen Janc  Electric devices  Researcher  2006 - 2008  0 
6.  02115  PhD Borut Jurčič Zlobec  Mathematics  Researcher  2006 - 2008  0 
7.  22337  Uroš Kovač  Energy engineering  Researcher  2006 - 2008  0 
8.  10269  PhD Dejan Križaj  Systems and cybernetics  Head  2006 - 2008  0 
9.  05075  PhD Drago Resnik  Electronic components and technologies  Researcher  2006 - 2008  0 
10.  06282  PhD Anton Rafael Sinigoj  Telecommunications  Researcher  2006 - 2008  0 
11.  13275  Matija Strehar  Electric devices  Researcher  2006 - 2008  0 
12.  22338  Stane Vidmar  Energy engineering  Researcher  2006 - 2008  0 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  1538  University of Ljubljana, Faculty of Electrical Engineering  Ljubljana  1626965  65 
Abstract
In the proposed project we will analyze and design a new type of miniature circuit braker that enables selective switching at overload of a protected circuitry. The most important advantage of a new design is selective principle of protection with parallel connection of electromagnetic tripping unit and a termomechanic one. This principle will significantly reduce the povver consumption of the breaker and enable breaking characteristics that are independent on the surrounding temperature. A thorough analysis will be performed using principles of numerical simulation of electromagnetic field in the tripping unit. The results will serve for design, development and optimization of a circuit braker.
Significance for science
We have developed a prototype of a completely new selective circuit breaker that will in the future replace the classical LV safety fusses in domestic as well as industrial environment. Comparing with the competition in the field we have succeeded to develop an apparatus that is temperature independent and has smaller electrical energy consumption. In the frame of the project we have optimized the electromagnetic circuit trigger which is an essential part of the selective circuit breaker. We have developed a completely new concept of a magnetic core that now incorporates a short-circuit ring. With this ring we were able to reduce the unwanted vibration of the shock needle under current overloading since the force vibrates at the rate of 100 Hz. Using a cooper ring we were able to reduce the average force so that the anchors do not cause excessive vibrations even at low currents. This step was crucial in order to prevent contact welding. The development and analysis of operation of the circuit breaker was assisted by computer tools for numerical simulations. Especially, we have concentrated on the analysis of operation of the electromagnetic trigger. The simulation results have been used in optimization of crucial design parameters. Currently, we are introducing a completely new technology in fabrication of magnetic cores. Using a sintering process we will be able to reduce the relative complex process of assembling. The most important advantage of sintering is exact formation of an air gap since the process reduces the gap between separate parts of the magnetic core.
Significance for the country
We have used the results of the project also in the development of other devices used in the switching techniques since we gained a lot of knowledge in the operation of electromagnetic devices and use of materials in electromagnetics. The gained knowledge will enable us to develop similar electromagnetic circuit breakers for interested industrial partners, especially those abroad. Besides, the cooperation betweeen the industry and university has resulted in sinergetic effects where we took advantage of theoretical as well as practical knowledge in exact understading of operation and design of electromagnetic curcuit breakers. Besides, we were able to transfer concrete industrial problems and solution strategies into academic environment. This cooperation presents motivation also for the students since they become aware of the importance of theoretical knowlede and its use in industrial applications.
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