Series capacitors are used extensively to reduce the power transfer impedance of long transmission lines. During times of high current, the capacitors are protected from the build-up of high voltages by spark gaps with which they are connected in parallel. This non-linearity affects the behaviour of the system as a whole. Firstly, this thesis is concerned with studying the system behaviour. A method of analysing the sub-harmonic resonance condition in which line losses are taken into account is proposed, and it is used to find a power system circuit in which operation changes from harmonic to subharmonic mode when a switch is operated. Also described is a method of achieving a transient stability analysis of a two-machine double-circuit series-compensated transmission system with a fault occurring on one circuit. The results are used to compare the effect of two types of protective spark gap. A transient analysis of a single transmission circuit is described, based upon Bergeron's Method of Characteristics. The spark gap type is shown to be instrumental in distorting current and voltage wave-forms. It is generally assumed that spark gap operation shortens the lifetime of the capacitors which it is protecting. This is investigated and is shown to have some theoretical foundation. Secondly, this thesis is concerned with the problem of finding a suitable distance protection scheme for series compensated lines. A number of possibilities are critically examined by making use of the analysis developed earlier in the thesis. A novel scheme based on definite integrals of relaying current and voltage was selected and a prototype relay was constructed in the laboratory using mostly analogue, but some digital circuits. Laboratory tests on the prototype relay and simulated tests carried out on the digital computer showed that the scheme meets the speed and accuracy requirements of modern protective relay.

The theory of motion in Ibn Bajjah's philosophy is studied in this dissertation from three aspects: physical, psychical and metaphysical

Graduation date: 1982

Graduation date: 1984

Thesis (M.F.)--Oregon State College, 1950. / Typescript. Includes bibliographical references (leaf 86). Also available on the World Wide Web.

Thesis (M.S.)--Oregon State College, 1948. / Typescript. Map of Crater Lake National Park and vicinity, issued by the U.S. Geological Survey, edition of 1946. Includes bibliographical references (leaves 118-120).

Thesis (M.S.)--Oregon State College, 1952. / Typescript. Includes bibliographical references (leaves 120-121). Also available online.

Thesis (M.S.)--Oregon State College, 1953. / Typescript. Includes bibliographical references (leaves 55-59). Also available on the World Wide Web.

Thesis (M.S.)--Oregon State College, 1941. / Typescript. Includes bibliographical references (leaves 1-ix). Also available on the World Wide Web.

Zugl.: Frankfurt (Main), Univ., Diss., 2005 / Hergestellt on demand