http://hdl.handle.net/10016/627 2013-05-22T06:31:25Z http://hdl.handle.net/10016/16765 Title: Power Quality in distribution power networks with photovoltaic energy sources Author(s): Albarracín, Ricardo; Amarís Duarte, Hortensia Abstract: Solar radiation is characterized by short fluctuations introduced by passing clouds. These solar fluctuations will produce Voltage and power fluctuations at the PCC (Point of common coupling). Flicker level should be evaluated by using a flickermeter according to the standard IEC 61000-4-15. Models of the solar fluctuation, photovoltaic modules and power converter are shown in this paper and the flickermeter model is tested according to the IEC requirements and the CIGRE/CIRED/UIE test protocol. 2008-12-31T23:00:00Z http://hdl.handle.net/10016/16238 Title: A Partial Discharges Acquisition and Statistical Analysis Software Author(s): Ardila-Rey, Jorge Alfredo; Martínez Tarifa, Juan Manuel; Robles, Guillermo; Rojas-Moreno, Mónica Victoria; Albarracín, Ricardo Abstract: Partial Discharges (PDs) are responsible forunexpected failures in power system equipment, so theirmeasurement is a fundamental tool for electrical equipmentmaintenance. In order to characterize PDs activity, somestatistical magnitudes are necessary. For this purpose, PDsacquisition and processing is an important tool for criticaldecisions related to power systems. In this paper, the maindifficulties and challenges facing PDs detection, acquisition andprocessing are presented. Results will be compared to acommercial PDs detection system. 2012-05-12T22:00:00Z http://hdl.handle.net/10016/16237 Title: Antenna selection and frequency response study forUHF detection of partial discharges Author(s): Robles, Guillermo; Martínez-Tarifa, Juan Manuel; Rojas-Moreno, Mónica Victoria; Albarracín, Ricardo; Ardila-Rey, Jorge Alfredo Abstract: Partial Discharge (PD) detection is a widely extended technique for electrical insulation diagnosis. Classical PD detection by means of phase resolved patterns require electrical connections to the power equipment and is sensitive to many noise sources. Ultra High Frequency (UHF) detection techniques are being recently proposed to overcome these problems, and to detect partial discharges on-line. In this paper, four antennas will be tested in order to compare their response to this physical phenomenon. 2012-05-12T22:00:00Z http://hdl.handle.net/10016/15944 Title: Análisis y simulación de potenciales de carril en sistemas ferroviarios de tracción en DC Author(s): Valero Rodríguez, Jorge Abstract: Esta Tesis Fin de Máster se centra en el análisis de las corrientes vagabundas y los potenciales de carril que se generan en los sistemas de tracción ferroviaria en corriente continua. Su estudio resulta esencial para garantizar la seguridad de equipos y personas, así como para el mantenimiento de las infraestructuras ferroviarias sometidas continuamente a fenómenos de corrosión. 2012-10-31T23:00:00Z