1,721,108 research outputs found
Electrical Engineers and the Infinity in Power Systems
No full textIn the realm of power systems, infinity serves as a pivotal theoretical construct, facilitating the representation of extreme limits of quantities as they approach exceedingly large values. This theoretical framework simplifies complex problems and fosters creative problem-solving approaches for engineers. This paper explores the multifaceted role of infinity as a theoretical construct in power systems scenarios, showcasing how this abstraction harmonizes with the practical application of engineering principles. The discussion spans concepts such as the ground-potential and infinite bus as reference points, the significance of infinity in power lines analysis, the practical implications of short-circuits and open-circuits in power systems, and the continuity of state variables. By bridging the theoretical and practical aspects, this paper contributes to a comprehensive understanding of how infinity is harnessed as a tool in the field of electrical engineering, demonstrating its significance in simplifying intricate problems and advancing power systems design and analysis
An Analytical Evaluation of the Prospective I2t to Assess Short-Circuit Capabilities of Cables and Busways
No full textGuest Editorial: Energy Efficiency, Building Automation, Metering, and Microgrids in Industrial and Commercial Power Systems
No full textThe papers in this special section examine building automation that incorporates energy management, microgrids, and automated metering. Energy efficiency is one of the most important goals in the design, operation, management, and maintenance of industrial and commercial power systems. Building automation systems and metering systems must be supported by intelligent and networked building controllers for lighting, sun harvesting, heating, ventilation, and air conditioning; in addition, local power generation, storage systems and controllable loads significantly contribute to energy conservation and cost-effective planning in industrial and commercial facilities by realizing a requirement-based energy use
A brief history of Maxwell's equations
No full textMaxwell's equations explain all phenomena of classical electrodynamics, magnetism, and optics the way Newton's equaMaxwelltions of motion describe classical mechanics. Maxwell introduced the theoretical description of electromagnetic waves and fostered a deeper understanding of the behavior of light
Insulation resistance and failures of a high-power grid-connected photovoltaic installation. A case study
No full textIn this article, the authors discuss the crucial aspects of the insulation resistance testing of photovoltaic (PV) installations. This test verifies the integrity of the wiring systems and can be used to detect or prevent damages to wiring as well as ground faults. The insulation resistance test measures the resistance between the ungrounded circuits and the ground under the application of high voltage. The baseline insulation resistance can be compared to measurements over time to assess the degradation of PV arrays or conductors. This test is accepted worldwide as a crucial element of commissioning and acceptance, and it is governed by several technical standards
A brief history of electromagnetism
No full textHans Christian?ersted (Figure 1) was a professor of physics at the University of Copenhagen (1777-1851). When he learned of the invention of the electric battery in 1799 from Alessandro Volta, he began to experiment with electric currents
Of International Terminology and Wiring MEthods Used in the Matter of Bonding and Earthing of Low-Voltage Power Systems
No full textThe worldwide global market requires electrical engineers to have a deep understanding of the bonding and earthing practices adopted in different countries around the world. This knowledge is essential to obtain effective designs and high safety standards and can promote the elimination of technical obstacles that can still create market barriers. The full comprehension of the "grounding" theory requires the command of key technical concepts regarding the earthing methods, which may cause confusion when used in the North American technical realm rather than in the International Electrotechnical Commission (IEC) world. This issue is further worsened by the lack of literature in this matter, as well as of harmonization documents between national codes and international standards. This paper, by analyzing the protection against indirect contact in ac (50/60-Hz) low-voltage power systems by automatic disconnection of supply, seeks to clarify both the terminologies and each type of grounding system adopted in IEC standards, with the intent to create a common reference for practicing engineers in the matter of bonding and earthing of power systems. Major differences encountered between sizing procedures adopted in IEC standards and the North American National Electrical Code are also examine
Protection of Trees against Lightning Strikes as a Measure to Prevent Fires and Loss of Human Life
Full text linkLighting strikes have been the catalyst of massive uncontrolled fires in areas of combustible vegetation. In some regions, lightning strikes may be a relatively unusual occurrence (e.g., California), but instead they seem to have become a major contributor to the propagation of wildfires, as a byproduct of climate change. Given such unusual weather, wildfires originating from lightning are an increasing threat. In this paper, the authors discuss the withstand capability of trees against lightning and introduce a proactive approach to prevent wildfires by the deployment of tree lighting protection systems (TLPS) to protect forested areas, where deemed necessary by the tree risk assessment
Paradigm shift: semantic memory decline as a biomarker of preclinical Alzheimer's disease
No full textNo abstract availabl
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