Enviaments recents

  • Study of resonances in 1 x 25 kV AC traction systems with external balancing equipment 

    Mesbahi, Nadhir; Monjo Mur, Lluís; Sainz Sapera, Luis (2016-10-01)
    Article
    Accés obert
    AC traction systems are 1 × 25 or 2 × 25 kV/50 Hz single-phase, nonlinear, time-varying loads that can cause power-quality problems, such as unbalanced or distorted voltages. To reduce unbalance, external balancing equipment ...
  • Aeronautical ground lighting system study: field measurements and simulations 

    Vidal, Daniel; Monjo Mur, Lluís; Sainz Sapera, Luis (2016-10-06)
    Article
    Accés obert
    Aeronautical ground lighting (AGL) systems are single-phase series circuits where constant current regulators supply transformers and luminaires. These systems provide visual reference to aircraft during airport operations. ...
  • Optimal fitting of high-frequency cable model parameters by applying evolutionary algorithms 

    Bogarra Rodríguez, Santiago; Riba Ruiz, Jordi-Roger; Sala Caselles, Vicenç; García Espinosa, Antonio (2017-05-01)
    Article
    Accés restringit per política de l'editorial
    Due to the widespread use of electronic power converters, low-voltage high-frequency cable models are being increasingly applied in industry, automobile or aeronautics applications among others. It is known that depending ...
  • Statistical study of personal computer cluster harmonic currents from experimental measurements 

    Mesas García, Juan José; Sainz Sapera, Luis; Sala Pérez, Pau (2015-01-02)
    Article
    Accés obert
    The net harmonic currents generated by a cluster of desktop personal computers are studied statistically. Personal computers (PCs) are single-phase non-linear loads with low individual consumption but significant collective ...
  • Lessons learned in the use of WIRIS quizzes to upgrade Moodle to solve electrical circuits 

    Bogarra Rodríguez, Santiago; Corbalán Fuertes, Montserrat; Font Piera, Antonio; Plaza, Inma; Arcega Solsona, Francisco Javier (2012-01-16)
    Article
    Accés obert
    WIRIS quizzes is an online mathematics tool for educational purposes that upgrades Moodle quizzes, and allows the development of personalized quizzes using random data and conditional instructions. WIRIS quizzes can be ...
  • Study of resonances in 1 x 25 kV AC traction systems 

    Monjo Mur, Lluís; Sainz Sapera, Luis (2015-09-14)
    Article
    Accés obert
    AC traction systems are 1 x 25 or 2 x 25 kV 50-Hz single-phase, non-linear, time-varying loads that can cause power quality problems. One of the main concerns about these systems is voltage distortion, because adjustable-speed ...
  • Using the instantaneous power of a free acceleration test for squirrel-cage motor parameters estimation 

    Kojooyan, Hengameh; Monjo Mur, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquim (2015-09-01)
    Article
    Accés obert
    A new parameters determination method for squirrel-cage induction motors is presented. As a main contribution, the method uses the instantaneous electrical power and the mechanical speed measured in a free acceleration ...
  • Study of resonance in wind parks 

    Monjo Mur, Lluís; Sainz Sapera, Luis; Liang, Jun; Pedra Durán, Joaquim (2015-11-01)
    Article
    Accés restringit per política de l'editorial
    Wind turbine harmonic current emissions are a well-known power quality problem. These emissions flow through wind park impedances, leading to grid voltage distortion. Parallel resonance may worsen the problem because it ...
  • Parameter estimation of squirrel-cage motors with parasitic torques in the torque–slip curve 

    Monjo Mur, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquim (2015-04-16)
    Article
    Accés obert
    This paper studies parasitic torques in steady-state torque–slip curves of squirrel-cage induction motors. The curves of nine motors (small, medium and large size units), three of which were measured in the range s = 2 ...
  • Testing of three-phase equipment under voltage sags 

    Rolán Blanco, Alejandro; Córcoles López, Felipe; Pedra Durán, Joaquim; Monjo Mur, Lluís; Bogarra Rodríguez, Santiago (2015-04-09)
    Article
    Accés obert
    This paper provides insight into the testing of three-phase equipment exposed to voltage sags caused by faults. The voltage sag recovers at the fault-current zeros, leading to a ‘discrete’ voltage recovery, that is, the ...

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