Failure analysis in power system by the discrete wavelet transform

Voltage variations are the most common power quality events that may result in corruption of different industrial processes. The electric power utility industry requires significant improvement in the quality of power provided to customers during faults or wide area system disturbance. Power system failure signals are monitored by using embedded systems. This paper presents an approach to provide the detection and location in time as well as the identification of power quality problems which are represented in both transient and fixed signals. The method was applied by using the discrete wavelet transform (DWT). The given signal is decomposed with wavelet transform and any change on the lower frequencies of the signal is detected at the finer wavelet transform resolution levels. The entropy contents of the signal are considered and a relationship between this entropy contents and the one of the corresponding component is accomplished. This paper shows wavelet transform can be used to reduce data set while covering original information. Because of the reduced data set embedded systems can work within a wider time range. Paper helps power system analysis and classifies power system failures

Power system failure analysis by using the discrete wavelet transform

Voltage variations are the most common power quality events that may result in corruption of different industrial processes. The electric power utility industry requires significant improvement in the quality of power provided to customers during faults or wide area system disturbance. Power system failure signals are monitored by using embedded systems. The wavelet transform is a transform similar to Fourier transform. It uses functions like the Fourier transform that are localized in both time and frequency. In addition, the wavelet transform requires less computation than the fast Fourier transform. This paper shows wavelet transform can be used to reduce data set while covering original information. Because of the reduced data set embedded systems can work wide time range. Paper helps power system analysis and classifies power system failures

Design approaches for retrofiting offices to reach nearly zero energy: A case study in the Mediterranean climate

Currently, feasible construction practices are not enough to reach zero energy buildings, therefore, European Union (EU) legislation states that new buildings and renovations should be designed as "nearly zero energy buildings (nZEB)"; however, design alternatives need to be carefully considered and selected before implementation. This study aims to investigate the effect of building facade elements and energy-efficient building systems on reaching nZEB with two different design approaches (DAs). These approaches are investigated through the case of a selected office building's facade retrofit options in terms of energy efficiency and thermal comfort. In the first DA, different design variables of a double skin facade (DSF) are investigated and optimized in order to decrease the total amount of consumed energy, and the best parameters are used in the design of the south facade. In the second DA, the building retrofit aims to meet nZEB criteria by redesigning the south building facade via genetic algorithm optimization, while providing thermal comfort in all months and reducing the number of discomfort hours. The investigation is carried out via building energy simulation (BES) of a selected office building, validated by indoor and outdoor measurements. The results show that the parameters of the building facade can play a significant role in decreasing the energy consumption of the building, and both DAs decrease total energy consumption while utilizing currently feasible and common building technologies. Yet, in the second DA not only is the energy consumption lower but, it also significantly decreases discomfort hours. (C) 2020 International Energy Initiative. Published by Elsevier Inc. All rights reserved

Interdisciplinary Expansions in Engineering and Design With the Power of Biomimicry

People have been finding inspiration in nature in solving their problems, from the very beginning of their existence. In the most general sense, biomimicry, defined as ""inspire from the nature,"" has brought together the engineers and designers nowadays. This collaboration creates innovative and creative outcomes that encourage people with their interdisciplinary relationships. Accordingly, the aim of this book is to bring together different works or developments on biomimetics in interdisciplinary relationship between different areas, especially biomimicry, engineering, and design. The twenty-first century has conceived many new and amazing designs. The book in your hands will surely be an important guide to take a quick look at the future possibilities