Made available in DSpace on 2014-10-09T12:23:36Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:19Z (GMT). No. of bitstreams: 1 00326.pdf: 895680 bytes, checksum: b8cdab1f62479c535fd7f130fbb059dd (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Fisica, Universidade de Sao Paulo - IF/USP

Made available in DSpace on 2014-10-09T12:23:36Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:19Z (GMT). No. of bitstreams: 1 00326.pdf: 895680 bytes, checksum: b8cdab1f62479c535fd7f130fbb059dd (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Fisica, Universidade de Sao Paulo - IF/USP

As the IEC 61850 digital substation standard becomes progressively adopted by utilities throughout the world, entirely computerized methods will completely replace traditional strategies for monitoring the power system. Although newer techniques offer enhanced efficiency and controllability, their reliability is not as established as that of conventional practices. Modern approaches require extensive validation and analysis before they can be implemented on a widespread basis. One specific area of interest is the performance of protection systems that utilize voltage and current samples digitized directly at their source. This research presents a complete test bench for evaluating sampled values-based protection schemes and measures their efficacy under several different operating conditions. It is shown that the novel system operates correctly for the situations it is expected to, with minimal latency compared to traditional practices. / Master of Science / Power system infrastrcutures are changing rapidly from analog arrangements to entirely digital methods. This offers numeous benefits such as increased efficiency, lower cost, higher accuracy, and even improved safety. However, digital implementations do not have an as proven track record as compared to conventional practices, leading to concerns about their reliaiblity. This research tests the performance an en entirely digital protection scheme by using various hardware components. The results are analyzed and show that the novel scheme operates correctly, albeit with a slight delay as compared to traditional methods.

Made available in DSpace on 2014-10-09T12:23:44Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:03:48Z (GMT). No. of bitstreams: 1 00947.pdf: 5792768 bytes, checksum: 3655a803616339af18a1a368dc3f4567 (MD5) / Thesis / IEA/T / University of Sussex, England

Made available in DSpace on 2014-10-09T12:23:44Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:03:48Z (GMT). No. of bitstreams: 1 00947.pdf: 5792768 bytes, checksum: 3655a803616339af18a1a368dc3f4567 (MD5) / Thesis / IEA/T / University of Sussex, England

birefringance, degreeofpolarization, polarization, Stokesvectors, Poincarésphere, state of polarization, optical power, sensoric fibre, polarization-maintaining fiber, polaroid, poalrimeter

This master’s thesis is dealing with possibilities of measurement of inductance by using of accurate capacitance bridge AH 2500E. In metrology there are no appropriate devices available for accurate measurement of inductance. It can be realized by four methods. The newest one is based on T elements, it is not used for this purpose yet and it is practically investigated in CMI Brno. For its introduction to practice it is neccessary to complete computer simulations and analysis of influences affecting measurement. It is also inevitable to examine repeatability of measurement, define methodology of measurement and potential corrections of measured values.