Sökning: "Hitachi Energy"

Visar resultat 1 - 5 av 21 uppsatser innehållade orden Hitachi Energy.

  1. 1. Characterizing the performance of a Real-Timesystem with task execution times

    Kandidat-uppsats, Uppsala universitet/Institutionen för elektroteknik

    Författare :Achilleas Karassavas; Sebastian Sjöberg; Andreas Grönlund; [2023]
    Nyckelord :;

    Sammanfattning : The purpose of this project work was to assist Hitachi Energy by analyzingdata logs from their MACH control system. The system itself operates athigh speeds, resulting in a huge amount of data each second. By writingtwo scripts in Python, statistical analysis was applied to the data followedby comparisons across multiple data logs. LÄS MER

  3. 2. Stray capacitance study for HVDC Classic : The use of PSCAD and Mathcad to calculate the equivalent stray capacitance

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

    Författare :Saga Dalersand; Fredrik Gjöthlén; [2023]
    Nyckelord :;

    Sammanfattning : The reactors placed in the thyristor valve designed by Hitachi Energy have reactor losses which are dependent on the stray capacitance. To find out the stray capacitance, and further get to know the reactor losses, a PSCAD simulation is performed. LÄS MER

  4. 3. Vibroacoustic Analysis of an OLTC Diverter Switch for Condition Monitoring : Time frequency analysis with Fourier and wavelet transform in combination with multivariate logistic regression for condition monitoring of OLTC diverter switch

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen för systemteknik

    Författare :Simon Persson; [2023]
    Nyckelord :Wavelet transform; CWT; logistic regression; machine learning; ML; vibroacoustic analysis; time frequency analysis; tap changer; diverter switch; power transformer; classification; prediction; condition; vibrations; state prediction; Hitachi Energy;

    Sammanfattning : Vibrations are everywhere around us all the time and we often recognise them as sounds that we can hear and analyse with our brain. In this thesis, data that has been gathered from a diverter switch (DS) in a controlled environment, is analysed. LÄS MER

  5. 4. Modellering, simulering och analys av kärnreaktorn BWRX-300

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad kärnfysik

    Författare :Erik Backlund; [2023]
    Nyckelord :Kärnkraft; SMR; små modulära reaktorer; liten modulär reaktor; kärnreaktor; BWR; BWRX-300; självcirkulation; passiv säkerhet; GE Hitachi; cykellängd; härddesign; nukleär design; Simulate5; GNF2; kärnbränsle; reaktormodell;

    Sammanfattning : The demand for fossil-free energy production is rising due to electrification and increased consumption in the energy system. There are also multiple climate goals to reach, to preserve the possibilities of a sustainable future. LÄS MER

  7. 5. Thermal Analysis of Tap- Changers

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad mekanik

    Författare :Daniel Lundberg; [2023]
    Nyckelord :Thermal analysis; COMSOL; tap-changers; heat transfer;

    Sammanfattning : This thesis provides a way of mapping the temperature development of the tap-changer oil for some different standardized loading cases. The project was in collaboration with Hitachi Energy for one of their production cites situated in Ludvika, Sweden. The software used for the simulation environment was COMSOL 6.1 which is a finite element solver. LÄS MER