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National Repository of Grey Literature 23 records found  beginprevious21 - 23  jump to record: Search took 0.00 seconds. 
MV Overhead Line Protections and their Coordination with Autoreclosers
 Šoustal, Petr ; Skala, Petr (referee) ; Orságová, Jaroslava (advisor)
The aim of this Master’s Thesis is to describe protections for overhead lines in distribution networks. Here are described requirements for the protection and the basic protections. Protections are divided according to their protective function. For each protection is given its use and its power plans. It is stated in the work setting of protection in the real network. On this network is simulated place with short-circuit and described the action of protection. The work also deals with the coordination of protection with automatic circuit breakers. This chapter shows that, given the selectivity is not possible to deploy two or more reclosers (remotely-operated switches) to the core network management. The next chapter describes two representatives reclosers available on the Czech market OSM 27 and GVR 27. Chapter describes and compares their performance characteristics. Conclusion the work includes a proposal protected the lead in incorporating automatic circuit breakers (remotely operated circuit breakers and reclosers). The proposal is based on two different levels of annual number of interruptions and duration of annual general interruption of electricity supply. For these levels the company EGÚ Brno, a.s. proposed several variants of the use of remote-controlled in terms of reducing the cost of the penalty. Our task was to choose a variant that would be applicable in the real network. Reducing costs is feasible only in the limits Ln = 6 failures / year and Lt = 720 min / year, where the selected option No. 4. The limits Ln = 8 failures / year and Lt = 1,080 min / year, not in the real network may no option in terms of selectivity.
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Clearance rate and food selectivity of bdelloid rotifers (Rotifera)
 HLÁVKOVÁ, Daniela
This dissertation is focused on three species of bdelloid rotifers Habrotrocha thienemanni, Macrotrachela insolita and Philodina roseola. We compared filtration activity, clearance rate and food selectivity within species, populations of the same species and clones.
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The effect of experience on the frequency-dependent food selectivity of predatory aquatic insects.
 DUDOVÁ, Pavla
The aim of this thesis is to evaluate current knowledge of predation in aquatic insects in the light of optimal foraging theory and switching. I explain these two phenomena and discuss how they can be connected to explain frequency-dependent prey selection. The review is complemmented by laboratory experiments on the effect of experience on frequency-dependent food selectivity of larvae of dragonflies (Odonata).
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National Repository of Grey Literature : 23 records found   beginprevious21 - 23  jump to record:
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