Search for dissertations about: "Hans Edin"

Showing result 1 - 5 of 20 swedish dissertations containing the words Hans Edin.

  2. 1. Partial Discharges Studied with Variable Frequency of the Applied Voltage

    Author : Hans Edin; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; diagnostic methods; partial discharges; phase resolved; variable frequency; dielectric spectroscopy; dielectric response; harmonics; insulation; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

    Abstract : This thesis concerns partial discharge (PD) diagnostics withvariable frequency of applied voltage in the frequency range 1mHz - 400 Hz. The exploration of a new type of spectroscopythat combines partial discharge analysis and dielectricresponse is demonstrated. READ MORE

  4. 2. Essays in Labor and Demographic Economics

    Author : Hans Grönqvist; Olof Åslund; Per-Anders Edin; Andrea Ichino; Uppsala universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Nationalekonomi; nationalekonomi; Economics;

    Abstract : Essay 1: (co-written with Olof Åslund) We study the impact of family size on intermediate and long-term outcomes using twin births as an exogenous source of varia¬tion in family size in an unusually rich dataset. Similar to recent studies, we find no evidence of a causal effect on long-term outcomes and show that not taking selection effects into account will likely overstate the effects. READ MORE

  5. 3. Magnetizing Currents in Power Transformers : Measurements, Simulations, and Diagnostic Methods

    Author : Claes Carrander; Hans Edin; Göran Engdahl; Rajeev Thottappillil; Amr Adly; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transformer core; diagnostics; three-phase; no-load; hysteresis; modeling; resonance; remanence; delta; Electrical Engineering; Elektro- och systemteknik;

    Abstract : This thesis demonstrates a method for transformer core diagnostics. The method uses the no-load current of the transformer as an indicator, and gives different characteristic signatures for different types of faults or defects. Using the no-load current for the diagnostic gives high sensitivity. READ MORE

  6. 4. On the polymer-based nanocomposites for electrical switching applications

    Author : Venkatesh Doddapaneni; Muhammet Sadaka Toprak; Hans Edin; Rudolf Gati; Matti Ilmari Lehtonen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymer-based nanocomposites; Inorganic nanoparticles; Electrical arcs; Circuit breakers; Ablation Outgassing; Arc interruption capability; PMMA; CuO; Fe3O4; ZnO; Au; Radiative energy; Electric power; Arc temperature.; Physics; Fysik;

    Abstract : Recent research demonstrated that polymer based nanocomposites (PNCs) have been engineered in order to improve the arc interruption capability of the circuit breakers. PNCs are the combination of nano-sized inorganic nanoparticles (NPs) and polymers, opened up new developments in materials science and engineering applications. READ MORE

  7. 5. Development of on-line diagnostic methods for medium voltage XLPE power cables

    Author : Valentinas Dubickas; Hans Edin; Roland Eriksson; Matti Lehtonen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Elektroteknik;

    Abstract : On-line diagnostics of power system components is an important area since it allows the diagnostics to be performed at regular intervals during the normal operation of the components. This combined with reliability centered maintenance could lead to reduced customer outages. READ MORE