Sökning: "high impedance fault"

Visar resultat 1 - 5 av 18 uppsatser innehållade orden high impedance fault.

  1. 1. Resonant overvoltages caused by transformer energization and saturation : Two EMT case studies conducted using models of the grid in Stockholm and an off-shore wind farm

    Master-uppsats, Uppsala universitet/Elektricitetslära

    Författare :Gustav Sundberg; [2021]
    Nyckelord :Resonant overvoltages; Resonance frequency; Parallel resonance; EMT studies; Transformer saturation; Off-shore wind power; Inrush current; Sympathetic Inrush; Resonanta överspänningar; Resonansfrekvens; Parallellresonans; EMT-studier; Magnetiseringsström; Havsbaserad vindkraft;

    Sammanfattning : This thesis investigates the impact of resonant overvoltages and their origin. Series and parallel resonances are present in any electrical grid. The frequency of which this resonance occurs is called resonance frequency. LÄS MER

  3. 2. Large Scale Analysis of Massive Deployment of Converter-based Generation equipped with Grid- forming Strategies

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

    Författare :Cristhian Carim Jimenez Saldana; [2020]
    Nyckelord :Grid-Forming; Converter-Based Generation; Voltage Source Converter VSC ; Current Limitation; Threshold-Virtual Impedance TVI ;

    Sammanfattning : To mitigate the carbon footprint and the need to fulfil the energy goals in terms of sustainability, it is required to deploy a large integration of green energies. Therefore, in the previous and the coming years, there will be a high research and technological interest in the high penetration of converter-based generation. LÄS MER

  4. 3. Implementation of an Arc Model for MV Network with Resonance Earthing

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

    Författare :Muhannad Almulla; [2020]
    Nyckelord :Distribution system; electrical arc; high impedance fault; Petersen coil; resonance earth.;

    Sammanfattning : The most common fault type in electric power systems is the line to groundfault. In this type of faults, an electrical arc is usually developed. The thesispresents a mathematical model that describes the behavior of the arc during afault. LÄS MER

  5. 4. Empirisk bestämning av nollföljdsimpedans hos transformatorer med utdragen deltalindning

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

    Författare :Carmen Dahlin; [2020]
    Nyckelord :;

    Sammanfattning : The main goal of the thesis is through available data, empirically determine the ratio betweenthe zero and positive-sequence impedance of different transformers with accessible-winding, i.e. when the -winding is loaded. LÄS MER

  7. 5. Testing and analysis of an intelligent electronic device (IED) prototype for MTDC overhead line application

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

    Författare :Ashen Gomes; [2020]
    Nyckelord :;

    Sammanfattning : A key problem faced with the implementation of a multi-terminal direct current (MTDC) grid is fault mitigation. One method extensively researched in mitigating a fault in MTDC is to use protection intelligent electronic devices (IEDs) and fast direct current circuit breakers (DCCBs). LÄS MER