Thesis (M.S.)--Ohio University, March, 1984. / Title from PDF t.p.

Thesis (Ph.D.) -- University of Adelaide, Dept. of Electrical Engineering, 1973?

Thesis (M.S. in Mechanical Engineering)--Washington State University. / Includes bibliographical references.

This thesis is concerned with the timing and coincidence circuitry which controls the operation of a time-sharing function generator and four-quadrant analog multiplier. The functions to be generated are fed into the computer in time sequence as voltage waveforms of short duration, A waveform is sampled at a particular value of the independent variable x and the resulting ordinate Ef is normalized with respect to the maximum function ordinate Em and multiplied by a reference voltage Er. The output of the multiplier is then a voltage which represents the expression EfEr/Em and this voltage is channeled through the computer. Multiplication is performed by the following method. Two voltages E₁ and E₂ are simultaneously applied to two identical linear networks whose response to unit voltage is N(t). The outputs are then E₁N(t) and E₂N(t). If, on comparing E₁N(t) with a reference voltage E₃, the second sweep E₂N(t) is clamped at the instant of equality, then N(t) = E₃/E₁ and the output is E = E₂N(t) = E₂E₃/E₁. The present proposal is to generate the functions optically. A function is graphed, photographed on 35 millimeter film, and mounted on the rim of a rotating disc. The optical system projects a narrow segment of the function onto a phototube and its output, biased for the zero level, follows the function ordinate in a strict voltage analog sense. The full abscissa scale is represented by a constant voltage and the input specifying the sampling point is some fraction of this full-scale voltage. In order that the sampling point x be independent of the velocity of the scanning disc the coincidence circuitry eliminates velocity as a variable in the selection of x. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

No description available.

No description available.

No description available.

Real-time simulators have been utilized to perform hardware-in-loop testing of protection relays and power system controllers for some years. However, hardware-in-loop testing of generator protection relays has until recently been limited by a lack of suitable dynamic models of synchronous generators in the real-time simulation environment. Historically, the Park transformation has been chosen as the mathematical approach for dynamic modelling of electrical machines in simulation programs, since it greatly simplifies the dynamic equations. However, generator internal winding faults could not be represented faithfully with the aforementioned modelling approach due to its mathematical limitations. Recently, a new real-time phase-domain, synchronous machine model has become available that allows representation of internal winding faults in the stator circuits of a synchronous machine as well as faults in the excitation systems feeding the field circuits of these machines. The development of this phase-domain synchronous machine model for real-time simulators opens up the scope for hardware-in-loop testing of generator protection relays since the performance of various generator protection elements can now be examined using the advanced features provided by the new machine model. This thesis presents a thorough, research-based analysis of the new phase-domain synchronous generator model in order to assess its suitability for testing modern generator protection schemes. The thesis reviews the theory of operation and settings calculations of the various elements present in a particular representative modern numerical generator protection relay and describes the development of a detailed, real-time digital simulation model of a multi-generator system suitable for studying the performance of the protection functions provided within this relay. As part of the development of this real-time model, the thesis presents a custom-developed real-time modelling approach for representing the load-dependent third-harmonic voltages present in the windings of a large synchronous generator which are needed in order to test certain types of stator-winding protection schemes. The thesis presents the results of detailed, closed-loop testing of the representative generator protection relay hardware and its settings using the developed models on a real-time digital simulator. The results demonstrate the correctness of the modelling and testing approach and show that using the phase-domain synchronous machine model, together with the supplementary models presented in the thesis, it is possible to evaluate the performance of various generator protective functions that could not otherwise have been analysed using conventional machine models and testing techniques. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2013.

Thesis (Ph. D.)--West Virginia University, 1999. / Title from document title page. Document formatted into pages; contains vi, 112 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 76-79).

Thesis (Ph. D.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains vi, 131 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 95-97).