Xem 1-15 trên 15 kết quả Power quality standards
  • Abstract: Industry standard for the control of switch mode power supply (SMPS) systems has been analog control. Now with the advent of high speed, lower cost digital signal processing (DSP) ICs, digital control there has been an increased interest in digital control of SMPS. The Power Electronics & Power Quality Laboratory of Texas A&M University is currently exploring several implementation aspects of digital control of power factor correction (PFC) stage of SMPS. Two low cost digital controllers: TMS320LF2407 and ST52x420 are evaluated for implementing PFC function.

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  • Power Quality Considerations Harmonics • What Are Harmonics? • Harmonic Sequence • Where Do Harmonics Come From? • Effects of Harmonics on the System Voltage • Notching • Effects of Harmonics on Power System Components • Conductors • Three-Phase Neutral Conductors • Transformers • Effects of Harmonics on System Power Factor • Power Factor Correction Capacitors • IEEE Standard 519 Badrul H. Chowdhury University of Missouri–Rolla Hirofumi Akagi Tokyo Institute of Technology Rajapandian Ayyanar Arizona State University 17.

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  • causing a voltage sag with duration of more than 1 cycle occurs within the area of vulnerability. However, faults outside this area will not cause the voltage to drop below 0.5 pu. The same discussion applies to the area of vulnerability for ASD loads. The less sensitive the equipment, the smaller the area of vulnerability will be (and the fewer times sags will cause the equipment to misoperate). The voltage sag performance for a given customer facility will depend on whether the customer is supplied from the transmission system or from the distribution system.

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  • Power engineering is the oldest and most traditional of the various areas within electrical engineering, yet no other facet of modern technology is currently undergoing a more dramatic revolution in technology or business structure. Perhaps the most fundamental change taking place in the electric utility industry is the move toward a quantitative basis for the management of service reliability.

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  • Revised to cover the latest innovations and trends, the newest edition of this classic work provides detailed coverage of every component of effective energy management. It includes expert information on, boilers, steam systems, cogeneration, waste-heat recovery, HVAC systems, control systems, systems maintenance, industrial insulation, indoor air quality, thermal energy storage, and codes and standards.

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  • This book is a companion volume to two published in 2011 by INTECH titled “Desalination, Trends and Technologies” and “Expanding Issues in Desalination”. The term “desalination” used in this series is in the broadest sense of the removal of dissolved, suspended, visible and invisible impurities in seawater, brackish water and wastewater.

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  • Another service is the grading of products by recognized standards of quality. Grading helps farmers get fair prices for their products. It also permits commercial buyers to make purchases of such products as milk, butter, eggs, and meat on a basis of quality and price. Wholesaling and retailing, two essential services, are performed on the widest scale possible. They reach every community.

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  • To solve these problems, the SEQ and PREDATOR systems introduce a spe- cial sublanguage, called SEQUINfor queries on sequences [Seshadri et al. 1994, 1995; Seshadri 1998]. SEQUIN works on sequences in combination with SQL working on standard relations; query blocks from the two languages can be nested inside each other, with the help of directives for converting data be- tween the blocks.

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  • This document and trademark(s) contained herein are protected by law as indicated in a notice appearing later in this work. This electronic representation of RAND intellectual property is provided for noncommercial use only. Permission is required from RAND to reproduce, or reuse in another form, any of our research documents. .This product is part of the RAND Corporation monograph series. RAND monographs present major research findings that address the challenges facing the public and private sectors.

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  • Although magnetic resonance imaging, or MRI, has been with us for quite some time and is in widespread and routine use, good “recipe books” on the performance of specific actual studies are hard to find. Since all imaging modalities, and particularly MRI, are carried out by a range of operators under varying clinical circumstances, standardizing the work flow becomes ever more important, because it is only through standardization that the quality of diagnostic imaging will improve. This pared-down book attempts to close the gaps in MRI protocols for routine applications.

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  • Currently, Mobile operators are busy with deployment of 4G technology namely, LTE-advanced or WIMAX 802.16m. This 4G technology will be concluded within two years. 5G technology is not standardizing yet, probably 5G standard will define in two to three years, and its deployment will start around 2020. In future, people will expect same quality of internet connectivity as the device is capable. This technology will include all types of advanced features, which make 5G technology more powerful.

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  • Using HTML5, web developers can create standards-based browser applications with extraordinary richness and power, incorporating everything from drag-and-drop to native audio and video–all without any third-party plug-ins. Simply put, every web developer needs to master HTML5–and the sooner you do so, the greater advantage you’ll have. HTML5 Developer’s Cookbook provides all the expert advice and proven code you need to start building production-quality HTML5 applications right now.

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  • In recent years the concept of intelligent multi-mode, multimedia transceivers (IMMT) has emerged in the context of wireless systems [l-61. The range of various existing solutions that have found favour in already operational standard systems was summarised in the excellent overview by Nanda et al. [3].

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  • These products can be provided as individual parts or single or multiple actuator systems with full engineering consultancy available as part of the service. As well as these standard products Power Jacks has a dedicated engineering team for the design of “Special” actuators to suit all customer requirements. There are over two million of our actuators successfully in operation world-wide and our partners Duff-Norton are the world-wide market leader in linear actuation systems. By specifying a Power Jacks product you are assured of quality, reliability, performance and value.

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  • Motivation of the Book In recent years the concept of intelligent multi-mode, multimedia transceivers (IMMT) has emerged in the context of wireless systems [l-61. The range of various existing solutions that have found favour in already operational standard systems was summarised in the excellent overview by Nanda et al. [3].

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