Thesis (M.S.)--Auburn University, 2008. / Abstract. Vita. Includes bibliographical references (p. 55-57).

Thesis (M.S.)--Rochester Institute of Technology, 2004. / Typescript. Includes bibliographical references (leaf 122).

Thesis (Ph. D.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Mechanical Engineering, 2009. / Includes bibliographical references.

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 115-121). Also available via the Internet.

Thesis (Ph. D.) University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 3, 2007) Includes bibliographical references.

A new microprocessor based synchronous switch has been developed at Virginia Tech as an improvement on the customary solid state electronic or mechanical switch. The author designed and built a 16-pole synchronous switch using a 16 bit microprocessor to provide programmable control on both the opening and closing times for each of the 16 poles of the switch. The user can define a sequence of states (short circuit and open circuit) for each of the 16-poles with control on a) The instant of shorting. b) The instant of opening. The above single shot action can be made repetitive by defining a period of repetition. The device is particularly useful in power system projects and has a unique place in repetitive and 'one time' switching in power system models. The switch is totally self-contained and can be operated through a terminal interfaced to an 8086 microprocessor based microcomputer. The microcomputer was developed and is dedicated to this application alone. The use of 8086 microprocessor facilitates realization of a relatively trouble free, noiseless operation. The system design contains a zero-crossing detector circuit which is used to interrupt the microcomputer for synchronisation. The system has buffered output ports which are connected to mercury wetted relays. These relays are controlled for ON and OFF operation by the user through the above system. The smallest short circuit duration of the order of 2 to 3 msecs can be achieved as determined by the mercury wetted relays. The switch can be used for any purpose where it is desired to accurately control switching points (opening, closing or faulting) on any low power AC network. The switch can be quite useful in studying transient phenomena on three-phase system models. The switch is useful in studying responses of various relaying schemes where it is desirable to test the relay at precise switching angles. Additionally, the switch would be very useful to test or operate circuit breaker models in the power simulation laboratory. / M.S.

Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Electrical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology, 2012 / People are spending more time being entertained at home now than ever before. It is currently common to find a home entertainment console containing an LCD or Plasma television, DVD player and surround sound amplifier in many homes. The number of home entertainment devices is increasing, yet our understanding of the effect that they have on power quality is incomplete. This study determines the power consumption of home entertainment equipment as well as the effect that such devices have on harmonic distortion levels. A methodology is developed for the measurement of the power consumption of home entertainment equipment including television sets, DVD players and home theatre. The results are compared to the Energy Star standard to determine if the power consumption of these devices is within the limits imposed. The methodology presented consists of three parts, performing measurements, generating results and comparison to energy and harmonic standards. The developed methodology includes steps for mathematically combining the measured voltage and current waveforms of individual devices. The goal is to determine total current and voltage waveforms for a combination of devices. The methodology also describes how to analyze the resultant synthesized waveforms so as to determine the power consumption at each harmonic. The levels of current harmonics for individual devices and groups of devices are determined and then compared to the EN6100-3-2 standard to ascertain if they are within the limits imposed. The power consumption and current harmonics of each combination as well as individual devices were analysed. Using the developed methodology, four case studies were conducted, grouping different home entertainment devices together. It was found that the power consumption of LCD television sets are below the limits imposed by the Energy Star standard while for Plasma based televisions it was above these limits. Current harmonic levels for CRT based televisions were found to be above the limits imposed by the EN6100-3-2 standard while those for LCD and Plasma based televisions the levels were below the limits. The research concludes that the current harmonics of new LCD and Plasma based televisions does not pose any concern for power quality.

During the operation of electrical equipment, heat is generated due to internal losses of the equipment. If these devices are located in the switchgear, the heat output of the individual elements adds up and the temperature in the switchboard can rise to values when the reliability of the individual devices decreases. One of the ways to prevent increase the temperature inside the switchgear from rising to critical values is to solve its proper ventilation (cooling with ambient air). By natural convection or using a ventilator. This diploma thesis deals with the most reliable way of cooling UniGear ZS1 switcgears by natural convection.

The thesis is focused on a temperature-rise of a low-voltage switchgear. The first part of the work deals with a technical standard related to the chosen topic, compares software used for designing switchgear in practice and familiarizes with the working environment of the software selected for this work. The main part of the work is dedicated to a measurement and a simulation of the temperature-rise of the low-voltage switchgear. The measurement involved testing of the switchgear with regard to the individual functional units and to the whole switchgear. Subsequently, the simulation of the temperature-rise of the switchgear followed. Software used in this work is SolidWorks Flow Simulation chosen due to a wide range of functions. According to the findings there were proposed adjustments of the switchgear with respect to the technical parameters and the economic aspect in the last part of the thesis.

Thesis. 1975. B.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. / Includes bibliographical references. / B.S.