Essays about: "Hitachi Energy"

Showing result 1 - 5 of 13 essays containing the words Hitachi Energy.

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

    University essay from Uppsala universitet/Institutionen för elektroteknik

    Author : Achilleas Karassavas; Sebastian Sjöberg; Andreas Grönlund; [2023]
    Keywords : ;

    Abstract : 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. READ MORE

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

    University essay from Uppsala universitet/Elektricitetslära

    Author : Saga Dalersand; Fredrik Gjöthlén; [2023]
    Keywords : ;

    Abstract : 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. READ MORE

  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

    University essay from Uppsala universitet/Avdelningen för systemteknik

    Author : Simon Persson; [2023]
    Keywords : 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;

    Abstract : 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. READ MORE

  5. 4. Thermal Analysis of Tap- Changers

    University essay from Uppsala universitet/Tillämpad mekanik

    Author : Daniel Lundberg; [2023]
    Keywords : Thermal analysis; COMSOL; tap-changers; heat transfer;

    Abstract : 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. READ MORE

  6. 5. Finite Element Simulation of Moisture Transport in Cellulose Insulation Material of Power Transformers

    University essay from Uppsala universitet/Tillämpad mekanik

    Author : Luc Villibord; [2023]
    Keywords : ;

    Abstract : Power Transformers are an important and complex part of the electrical transmission technology. One of the main producers of these transformers worldwide is Hitachi Energy, for which this work has been done. READ MORE