Sökning: "Single-line to ground faults"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden Single-line to ground faults.

  1. 1. IT-kopplade AC-nät : Enpoliga jordfel i befintlig elanläggning under jord

    Uppsats för yrkesexamina på grundnivå, Umeå universitet/Institutionen för tillämpad fysik och elektronik

    Författare :Linus Lycksell; [2020]
    Nyckelord :IT-system IT system IT-koppling IT koppling enpoliga jordfel lågspänning lågspänningsnät isolationsövervakning jordfelsövervakning konstgjord neutralpunkt kapacitiv koppling;

    Sammanfattning : In some electrical facilities for underground mining, IT-system grounding is used for processes of high priority. This report explains why such systems are used in these kinds of environments, what happens when single-line-ground faults occur and how does the fault protection and monitoring devices handle those faults in accordance to current regulations and standards. LÄS MER

  3. 2. Detection and location of HVDC commutation faults from PMU data

    Master-uppsats, Lunds universitet/Industriell elektroteknik och automation

    Författare :Alejandro Belinchon Calderon; [2018]
    Nyckelord :HVDC-links; HVDC converters; Commutation failures; Phasor measurement units PMUs ; Electric power systems; Wide Area Measurement systems WAMS ; Standard IEEEC 37.118; Single-line to ground faults; Three-Phase faults; Fault detection and location; Nordic 32; DigSilent-PowerFactory; PSCAD; MATLAB-Simulink; Symmetrical components.; Technology and Engineering;

    Sammanfattning : Commutation Failures in LCC HVDC converters is a topic that is normally addressed from the component perspective, looking at converters’ internal signals. How these commutation failures affect the outer AC network is not deeply understood yet. LÄS MER

  4. 3. Grounding of distrubution grids : High impedancegrounding compared to solid grounding with Fault Current Limiter

    Uppsats för yrkesexamina på avancerad nivå,

    Författare :Maria Kättström; [2017]
    Nyckelord :;

    Sammanfattning : Today cables replace overhead lines in distribution systems and cause higher system capacitance and higher capacative fault currents. This fault current, in the fault location, is limited by a Petersén coil and a resistance in parallel when a fault occurs in so called “high impedance grounded systems” which are commonly used in Europe. LÄS MER

  5. 4. Fault Location and Classification for Transmission Line Based on Wavelet Transform

    Master-uppsats, KTH/Skolan för elektro- och systemteknik (EES)

    Författare :Qiuhong Wang; [2016]
    Nyckelord :Traveling wave; fault location; fault classification; wavelet transform; ATP EMTP.; Vågrörelse; fellokalisering; felklassificering; wavelet transformation; ATP EMTP;

    Sammanfattning : With the rapid development of power systems, locating and classifying faults is critical to the continuity and reliability of the transmission system. In this thesis, a traveling-wave based technique for fault location and classification on high voltage and extremely high-voltage transmission lines is proposed. LÄS MER

  7. 5. GIC immune transformers - An evaluation of their GIC elimination and fault behaviour

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Industriell elektroteknik och automation

    Författare :Kajsa Eriksson Rosenkvist; [2015]
    Nyckelord :GIC Geomagnetically Induced Currents Transformers Un-symmetrical faults; Technology and Engineering;

    Sammanfattning : Geomagnetically Induced Currents (GICs) arise from fluctuations in Earths magnetic field and can reach alarmingly high levels and cause malfunctions or blackouts in the power grids in which they occur. AF Klercker Alaküla and Lindahl invented a patented GIC immune transformer which eliminates the effects of GICs, though it is not known how this implementation will affect the transformers behavior during un-symmetrical faults. LÄS MER