Sökning: "Per Westerlund"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Per Westerlund.

  1. 1. Condition measuring and lifetime modelling of electrical power transmission equipment

    Författare :Per Westerlund; Patrik Hilber; Tommie Lindquist; Carl-Ejnar Sölver; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; disconnectors; circuit breakers; reliability; lifetime; electric contacts; electric power transmission; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The electric grid is important in modern society, so the outages should be few. The transmission grid should have a real high availability, since it transports electrical energy across the country. Then, it is difficult to plan outages for maintenance and installation. LÄS MER

  3. 2. Condition measuring and lifetime modelling of disconnectors, circuit breakers and other electrical power transmission equipment

    Författare :Per Westerlund; Patrik Hilber; Tommie Lindquist; William Q Meeker; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; reliability; maintenance; condition monitoring; disconnector; circuit breaker; Weibull distribution; prediction; risk analysis; decision making; beta distribution; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The supply of electricity is important in modern society, so the outages of the electric grid should be few and short, especially for the transmission grid. A summary of the history of the Swedish electrical system is presented. The objective is to be able to plan the maintenance better by following the condition of the equipment. LÄS MER

  4. 3. Lust och olust : elevers erfarenheter i textilslöjd

    Författare :Stina Westerlund; Kajsa Borg; Inger Landström; Per-Olof Erixon; Marléne Johansson; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; school subject sloyd; experience-based learning; practical intersubjectivity; emotional practice; focus group interviews; video recordings; stimulated recall; secondary school; slöjd erfarenhetsbaserat lärande; praktisk intersubjektivitet; emotionell praktik; fokusgruppsamtal; högstadiet; rörlig bild; pedagogiskt arbete; educational work;

    Sammanfattning : The aim of the thesis is to investigate and analyse students’ expressions of pleasure and displeasure and how these are manifested in actions in the teaching of textile sloyd in lower secondary education. The study’s focus is on students’ expressions of pleasure and displeasure in social action in the working processes of textile sloyd and on how these expressions can be related to learning. LÄS MER

  5. 4. Data management improvements in the electrical grid : a pathway to a smarter cyber-physical system

    Författare :Sylvie Evelyne Koziel; Patrik Hilber; Ebrahim Shayesteh; Per Westerlund; Mathaios Panteli; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; asset management; data management; data analytics; distribution; grid operation and planning; machine learning; cyberinfrastructure upgrade; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The current power system is a network of electrical components forming a physical system. It is experiencing changes, such as the deployment of electric vehicles and distributed energy sources. Meanwhile, cybernetworks are becoming coupled into the physical grid to an increasing degree. LÄS MER

  7. 5. From data collection to electric grid performance : How can data analytics support asset management decisions for an efficient transition toward smart grids?

    Författare :Sylvie Evelyne Koziel; Patrik Hilber; Per Westerlund; Ebrahim Shayesteh; Iordanis Koutsopoulos; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; asset management; data analytics; data management; distribution system operators; electrical power grid; machine learning; real-world datasets; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Physical asset management in the electric power sector encompasses the scheduling of the maintenance and replacement of grid components, as well as decisions about investments in new components. Data plays a crucial role in these decisions. LÄS MER