Sökning: "shunt"

Visar resultat 1 - 5 av 58 uppsatser innehållade ordet shunt.

  1. 1. Eliminating zero-missing phenomenon in long, high voltage, underground cables

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Agnes Linnet; [2019]
    Nyckelord :Underground cable; zero-missing phenomenon; switching transients; shunt reactors; underexcited generators; Underjordisk kabel; nollbristande fenomen; växlingstransienter; shuntreaktorer; underexiterad generatorer;

    Sammanfattning : The maximum length of an high voltage underground cable (HV UGC) cable is oftenconstrained by the criterion that the cable cannot have more than 50% reactivepower compensation. If this limit is exceeded the current in the circuit breaker maynot have a zero crossing after energization, which is referred to as the zero missingphenomenon. LÄS MER

  2. 2. Fabrication and characterisation of RGB LEDs based on nanowire technology

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Patrik Olausson; [2019]
    Nyckelord :RGB LEDs; InGaN; GaN; nitrides; platelets; nanotechnology; Technology and Engineering;

    Sammanfattning : The white light LEDs of today are usually based on a blue LED and a phosphor, converting the blue light to longer wavelengths. While these phosphor-converted LEDs are extremely efficient compared to incandescent light or fluorescent light, there is still plenty of room for improvement. LÄS MER

  3. 3. Reaktiv effekt i Dala Energis framtida mellanspänningsnät

    M1-uppsats, Umeå universitet/Institutionen för tillämpad fysik och elektronik

    Författare :Mark Welbourn; [2019]
    Nyckelord :Power grid; reactiv effect; Underground cable; Capacitor banks; shunt capacitance;

    Sammanfattning : Dala Energi has large-scale plans for grid development and wants to have a better understanding of their current reactive power levels along with a future prognosis based on their plans. Changes in line inductance, shunt capacitance, area and placement put Dala Energi on the path to higher charging currents and higher reactive power generation. LÄS MER

  4. 4. Development of new criteria for train detection and evaluation in critical conditions

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Sofiane Kerbal; [2019]
    Nyckelord :railway signaling; train detection; track circuit; shunt; frequency modulation; frequency-shift keying modulation; third-order harmonic; short-time Fourier transform; power spectral density estimation; cross-correlation;

    Sammanfattning : Railway signaling is of paramount importance to ensure traffic management andsafety on the rail network. The main lines are divided into sections called ‘blocks’,which are governed by a fixed signal installation. To prevent trains from colliding,each block allows one train at once. LÄS MER

  5. 5. Lågtempererade uppvärmningssystem och dess potential i nybyggda och energieffektiva kontorshus : En studie i att använda returtemperatur från befintlig bebyggelse till uppvärmning

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Teknisk-naturvetenskapliga fakulteten

    Författare :Johan Gustafsson; [2018]
    Nyckelord :;

    Sammanfattning : This master thesis examine how a low temperature radiator systemcan be implemented in a new built office and what effects this will have on the return temperature. One point in the system was logged and data was collected. LÄS MER