Search for dissertations about: "reluctance network method"

Found 4 swedish dissertations containing the words reluctance network method.

  1. 1. Electromagnetic Modelling of Power Transformers with DC Magnetization

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Seyed Ali Mousavi; KTH.; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transformer; Hysteresis; DC magnetization; GICs; FEM; reluctance network method;

    Abstract : DC currents that flow through the ground can be injected to the star windings of power transformers from their grounded neutral points and close their path with transmission lines. The geomagnetically induced currents (GICs) and AC/DC convertors of high voltage direct current (HVDC) systems are the sources of such DC currents. READ MORE

  2. 2. An FRA Transformer Model with Application on Time Domain Reflectometry

    University dissertation from Stockholm : KTH Royal Institite of Technology

    Author : Hanif Tavakoli; KTH.; [2011]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; complex permeability; lumped circuit model; frequency response analysis; time domain reflectometry; high frequency modeling; transformer diagnosis; reluctance network method.;

    Abstract : Frequency response analysis (FRA) is a frequency-domain method which is used to detect mechanical faults in transformers. The frequency response of a transformer is determined by its geometry and material properties, and it can be considered as the transformer’s fingerprint. READ MORE

  3. 3. Electromagnetic Modelling of Power Transformers for Study and Mitigation of Effects of GICs

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Seyedali Mousavi; KTH.; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; transformer; hysteresis; DC magnetization; GMD; GICs; FEM; reluctance network method; low frequency transients; core losses; winding losses; eddy current losses; transformator; hysteresis; DC; likströmsmagnetisering; GMD; GIC; FEM; reluktansnätverksmodell; lågfrekventa transienter; kärnförluster; lindningsförluster; virvelströmsförluster; Electrical Engineering; Elektro- och systemteknik;

    Abstract : Geomagnetic disturbances that result from solar activities can affect technological systems such as power networks. They may cause DC currents in power networks and saturation of the core in power transformers that leads to destruction in the transformer performance. READ MORE

  4. 4. Dimensioning Tools of MEA Actuator Systems, Including Modeling, Analysis and Technology Comparison

    University dissertation from Stockholm : KTH

    Author : Mohsen Torabzadeh-Tari; KTH.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dimensioning tools; MEA; More Electric Aircraft; EMA; Electro Mechanical Actuator; EM; Electrical Machine; Converter; Inverter; Finite Element Method; FEM; TECHNOLOGY Electrical engineering; electronics and photonics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik;

    Abstract : Aircraft design is an example of complex engineering where dimensioning tools can be valuable for the designers and decision makers in the early stage of the development process. These tools can be in form of a database over key numbers for different components or technologies.One of the critical parts of an aircraft is the actuator system. READ MORE