Sökning: "tap-changers"

Visar resultat 1 - 5 av 13 uppsatser innehållade ordet tap-changers.

  1. 1. 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

  3. 2. Power Electronic Enhanced Distribution Transformer : Seamless Voltage Regulation with Extended Functionalities

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

    Författare :Nils Johansson; [2022]
    Nyckelord :Hybrid distribution transformer; Power converters; Voltage control; Hybrid power system; Reactive power; Hybrid distrubitionstransformator; Effektomvandlare; Spänningskontroll; Hybrida elnät; Reaktiv effekt;

    Sammanfattning : On-load tap changers and static synchronous compensators (STATCOM) are the main components for voltage regulation and power quality optimization in the power system. STATCOMs are used in both industrial applications and utility to stabilize the grid and reduce downtime. LÄS MER

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

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

    Författare :Oscar Stenhammar; [2021]
    Nyckelord :on-load tap-changer; OLTC; power transformer;

    Sammanfattning : 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. LÄS MER

  5. 4. Dielectrics calculation of on-load tap-changer VUCL

    M1-uppsats, KTH/Hållbar produktionsutveckling (ML)

    Författare :Seywan Karimi; [2021]
    Nyckelord :Dielectrics; tap-changer; transformer; lightning impulse levels LI ; system voltage; direct current; resistor; and epoxy material; Dielektriska; lindnings kopplar; transformator; blixtimpuls nivåer LI ; systemspänning; likström; motstånds; epoximateria;

    Sammanfattning : This is a bachelor's thesis in Mechanical engineering. The main topic of the thesis is the electrical calculation of the tap changer's shield. Although there are many kinds of tap-changers, this study focuses on VUCL models. The theoretical background of the thesis is that the new shield is suitable and useable in all VUCL models. LÄS MER

  7. 5. Evaulation of liquid-exfoliatedgraphene as additive in Ag-basedsliding contacts

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

    Författare :Stina Juhlin; [2018]
    Nyckelord :liquid-exfoliated graphene; liquid exfoliated graphene; graphene; sliding contacts; additive in Ag-based sliding contacts; Raman; SEM; EDS; tribometer; liquid exfoliation; liquid phase exfoliation;

    Sammanfattning : This master thesis work is performed at ABB Corporate Research Center inVästerås. The aim of this study is to investigate Ag:graphene composites as slidingelectrical contacts, suitable for use in e.g. tap-changers. LÄS MER