In our lab tehre are set one of the modernest multifunctional protections from ABB company: REF630 and RET630. These protections are used in distributive and industrial switchboards VN or VVN. Thanks to them it is possible to simulate controlling of low-voltage model of the switchoboard. To this switch poles serve where each elements of switchboard (it means off switch, isolating switch, grounding devices) are simulated thanks to contactors. These contactors are managed by binary outputs and inputs. Further it is possible to connect switchboard’s output to an unit for simulation of electrical transmission lines on which we can set different values of passive components. Any turns from lines we can connect to a model with faults where we can simulate various kinds of electrical short circuits. This is important for testing individual protectional fucntions.

There is also a load unit available in the laboratory, where loads of different types can be connected using passive elements (R, L, C).

Both of multifunctional protections have besides protective functions as well as measuring, logical and controlling ones. Everything can be set in computer thanks to software PCM600 by means of programming due to fucntional blocks. As an innovation we can manage a whole model of switchboard by controlling system ABB 800xA even from home through the remote desktop feature.

 

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I want to study at FEI, I want to submit application.

As a student you have an option to design and measure real lighting systems, indoor as well as outdoor. By outdoor lighting systems there is a need to take into consideration their overlap into environmential area of disruptive light, it means the mentioned visibility in night traffic space and ensured security.

That you have read the previous sentences the lighting generated from the monitor causes it, it means lighting system of artificial lights – day lights which we teach you to design it, too.

 

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No doubts FEI is my future. ...

I want to study at FEI, I want to submit application.

The pricniple of numerical simulations is quite simple. In some from CAD programmes 3D object model is created. It can be a contactor, circuit breaker, generator, motor, isolator or switch with fuses or even whole switchoard. To the individual model of objects material qualities are assigned and whole issue is solved thanks to compuiting software in ordinary PC, notebook, work station or even in supercomputer. After solution the images of various physical poles arise (electromagnetic. magnetic, electrical, thermal, streaming) and the computation is finally technically evaluated. With numerical modeling and simulations a lot of high qaulity student thesis dealt. Three of them are described below.

“When it is windy, it turns. When it turns, it shines.”

The first thesis is dealing with a concept of windy powerhouse with vertical axis of turning. The base is windy motor with oblique paddles that is mechanically joined to synchronic generator. This small powerhouse can use for public lighting supplying as you can see in front of VŠB-TUO canteen. To be selfsufficient is fine. Moreover, each electrotechnician should have at least one powerhouse at home.

“Who does not refrigerate, then burns.”

The second thesis is focused on an optimalization of electric motor refrigerating. Why do we refrigerate electrical machines after all? Because electric motor is a machine in real that exchanges electrical energy for mechanic one and does its work on a shaft. During this exchange of energy from one on another one losses always arise. And these losses are heat itself that has to get out from electrical mechine. The better we refrigerate, the machine has lower temperature. A liquid nitrogen or dry ice isn´t necessary, only fan is needed on the shaft.

“When a circuit does its work as it should.”

A study project or a favourite lab task of all students represents a process in which burning gases from an exhaust circuit shoot in a passage of faulty electric current and explode faulty fuses. Maybe you are wondering where the numerical methods, simulations and computers are. All you can search in the blue tinny box on the picture. This is a short circuit generator that creates faulty electric current of approximately 1,5 kA. A value of inductive coil was here computed by numerical methods and the coil together with capacities gives a needful frequency to electric currect 50HZ. The small “computer”, PLC relé, takes care of a correct procedure of operrations to make the short circuit generator functional and safe for service. The task tests the quality of circuits from the security point of view of secured circuit from impacts of the short circuit current.

 

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No doubts FEI is my future. ...

I want to study at FEI, I want to submit application.

Cubicle type switchboard located in HARD lab has two cubicle terminals, a double system of busways and maximal voltage 35 kV. Both of terminals are monitored and cotrolled by digital protections RELION from company ABB. For these protections it is possible to create new configurations and then test their secure functions.

Thanks to the double system of buways we can demonstrate manipulations of switchboard from an ordinary run in practise as switching over systems of buswyas or put a performance switch out of operation during maintenance. Due to measuring transformers of current and voltage that are installed in switchboard, we can evaluate them during their failure states.

The last but not the least the switchboard offers distance operating based on SCADA system when there is an option to manipulate with machines and regulate their voltage without any personal presence in a lab.

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No doubts FEI is my future. ...

I want to study at FEI, I want to submit application.