Sökning: "windings"

Visar resultat 11 - 15 av 67 uppsatser innehållade ordet windings.

  1. 11. Minimizing Transformer No-Load Losses at Hydropower Plants : A Study of Effects from Transformer Switch-Off During Stand-by Operation

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för elektroteknik

    Författare :Elin Luedtke; [2021]
    Nyckelord :step-up transformer; transformer switch-off; stand-by operation; idle operation; transformer winding; inrush current; fatigue stress; fatigue failure; S-N curve; transformer thermal cycling; thermal time constant; saving potential in hydropower; hydropower plant;

    Sammanfattning : Hydropower is the most important power balancing resource in the Swedish electrical power system, regulating the power supply to match the load. Consequently, several hydropower plants have periods of stand-by operation where the power production is absent but where several devices within a plant are still active. LÄS MER

  3. 12. Laserparametrars påverkan på svetsdjup och porbildning för lasersvetsade koppar-hairpins

    Kandidat-uppsats, Högskolan i Skövde/Institutionen för ingenjörsvetenskap

    Författare :Jessica Pettersson; [2021]
    Nyckelord :;

    Sammanfattning : Detta examensarbete handlar om lasersvetsning av koppar-hairpins som används som statorlindning i elmotorer. Vid lasersvetsning kan olika parametrar väljas som lasereffekt, matningshastighet med mera. LÄS MER

  4. 13. Fault Detection in Permanent Magnet Synchronous Motors using Machine Learning

    Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Alexander Lennartsson; Martina Blomberg; [2021]
    Nyckelord :PMSM; Fault Detection; AI; artificial intelligence; Machine Learning; inter turn short circuit; inter turn short fault; turn-to-turn; permanent magnet synchronous motor; short circuit; fault; avionics; airplane; aircraft;

    Sammanfattning : In the aviation industry, safety and robustness are the number one priorities, which is why they use well-tested systems such as hydraulic actuators. However, drawbacks such as high weight and maintenance have pushed the industry toward newer, electrical, actuators that are more efficient and lighter. LÄS MER

  5. 14. Influence of structural and materials properties on the flexural strength of laminated high-density cellulose fiberboards

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Ola Serck; [2021]
    Nyckelord :;

    Sammanfattning : Laminated pressboard is a structural electrical insulation material used in power transformers. Typical applications are areas in the power transformers where high mechanical forces are present such as pressrings or winding tables and cleats which support the electrical cables connecting the transformer windings to tap-changes and bushings. LÄS MER

  7. 15. Radialmåttavvikelser i Transformatorlindningar : Ett examensarbete hos Hitachi ABB Power Grids Ludvika

    Uppsats för yrkesexamina på grundnivå, Uppsala universitet/Industriell teknik

    Författare :Johan Strandh; Viktor Ruda; [2021]
    Nyckelord :Transformer; transformer manufacturing; windings; tolerance stack up; quality assurance; tolerances; dimensional excess; power conductor; continuous transposed conductor; CTC; Transformator; högkraftstransformator; transformatortillverkning; kvalitetssäkring; toleransstapling; toleranser; måttöverskridning; högkraftsledare; CTCledare.;

    Sammanfattning : This assignment is based on the tolerance problems that occur with the radial dimensions or RR-dimensions for the windings. The purpose is to identify the various parameters that affect said RR-dimensions and where these parameters originate from to be able to assure quality of the winding process. LÄS MER