Essays about: "tap changer"

Showing result 1 - 5 of 14 essays containing the words tap changer.

  1. 1. 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

  3. 2. 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

  4. 3. Design changes to simplify maintenance and condition assessment on a tap changer

    University essay from Jönköping University/JTH, Industriell produktutveckling, produktion och design

    Author : Arvid Fermér; Jakob Modling; [2023]
    Keywords : Power transformer; Chemical degradation; Electrical insulation; Tap changer; Insulation Electrical; Transformer insulation; Insulating oil; Insulation condition assessment; Transformer; Power grids; Power distribution; Oil filled transformer; Transformer oil;

    Abstract : This master thesis investigates a redesign for a maintenance tube, used for both sampling and draining transformer oil from a tap changer compartment. With the current design, one can do one or the other of sampling and draining. READ MORE

  5. 4. Analysis of factory test data of on-load tap-changers for power transformers

    University essay from Uppsala universitet/Avdelningen för systemteknik

    Author : Oscar Stenhammar; [2021]
    Keywords : on-load tap-changer; OLTC; power transformer;

    Abstract : On-load tap-changers (OLTC) are devices in the power grid that keeps the voltage level constant for consumers, regardless of the power demand. Hitachi ABB Power Grids, producer of the OLTC family named VUC, guarantees 30 years of lifetime. Such a pledge requires high standard devices. READ MORE

  6. 5. Description of different measurement software used for Tap Changer : Evaluating existing software and its uses

    University essay from Uppsala universitet/Institutionen för elektroteknik

    Author : Johan Mårtensson; Anton Kainulainen; David Radisic; [2021]
    Keywords : ;

    Abstract : ABB Hitachi currently has 10-20 year old software’s in use during their lab testing and a lack of in-depth knowledge of how the source code works due to corporate mergers and retiring staff. The programs were outdated and the expertise of how the software’s backend works were no longer available at Hitachi ABB. READ MORE