Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Out-of-step"”.
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Multiple Swing Out-of-Step Relaying
… to guarantee a continuous and reliable operation of the bulk interconnected system. The development of the synchronized Phasor Measurement technology, and its deployment in several locations in the network, has introduced a promising means to protect power systems from undesired conditions. This …
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Adaptive out of step relay algorithm
… voltage (EHV) transmission grid and the rest of the country behave as a two machine system for the following two types of disturbances loss of a large generator in the southern region of the peninsular power company faults on the 500 kV interconnections between the two systems Whether the two …
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Adaptive out-of-step relaying with phasor measurement
This work describes the development of an adaptive out-of-step relay, from the formulation of its concept to its field implementation and one year testing at the Florida- Georgia interface. This dissertation describes the theory of such a relay, its hardware configuration, the system as it was …
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A predictive out-of-step protection scheme based on PMU enabled distributed dynamic state estimation
Recent widespread blackouts have indicated the need for more efficient and accurate power system monitoring, control and protection tools. Power system state estimation, which is the major tool that is used nowadays for providing the real-time model of the system, has significant biases resulting …
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An investigation into the importance of considering protection performance during power system out-of-step conditions
The performance of power system protection is affected by out-of-step conditions in that system. Protection relays such as distance relays may detect an out-of-step condition and consequently operate to trip unfaulted lines. The tripping of unfaulted lines interrupts supply to loads and exacerbates …
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Performance comparison between Dual-blinder and a Phasor-based Out of Step detection functions using hardware in the loop test
When an Out of Step (OOS) event occurs between two connected areas in the power system, the two areas should be separated before the OOS results in generation loss, equipment damage, and eventually a total black-out. This separation is achieved via the OOS function that implemented at specific …
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A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
… conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is complemented by another type of …
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A New Special Protection Scheme for Power System Controlled Separation
… scheme is proposed to prevent the propagation of cascading failures across a transmission network should it undergoes a major disturbance, thereby reducing the possibility of a large-scale blackout. This scheme is developed based on a set of conjectures, which state the following: (i) the …
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Synchronized Measurements And Applications During Power System Dynamics
… by prevailing system frequency. Some major blackouts in power systems are indeed featured with very large frequency disturbance. Quantitative study done in this dissertation shows that small frequency disturbance may lead to measurement errors, and large frequency disturbance may lead to wrong …
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Analysis of a Major Electric Grid – Stability and Adaptive Protection
Protective systems of the electric grid are designed to detect and mitigate the effects of faults and other disturbances that may occur. Distance relays are used extensively for the detection of faults on transmission lines. Out-of-step relays are used for generator protection to detect loss of …
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Reduced order power system models for transient stability studies
… the utilities must look to ways to make the most of the current transmission system. Adaptive relaying is one way to enhance the ability of the power system. On the Florida - Georgia interface an adaptive out-of-step relay is being installed. This relay determines if swings on the power system …
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One Wednesday Morning
<p><em>One Wednesday Morning</em> is a collection of thirteen stories set in both the United States and England. Due to these transatlantic settings, certain disparities in language (between standard US and UK English) appear throughout the collection. The stories themselves focus primarily on …
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Hello from the other side; I'll compromise a thousand times : how minority party governors win unlikely elections
… governors. These minority party governors are out of step with their state's mass ideology and partisanship when research on public opinion and voting behavior suggests that it should be fairly easy for voters to elect officials that match their own ideology by using partisan cues and other …
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A Local Measurement Based Protection Methodology for Initiating Controlled Islanding in Power Systems
Despite layers of protection at work, power systems still have experienced major blackouts in the past due to cascading outages. Hence, preventing the cascading outage holds the key to the prevention of such blackouts in the future. To address this problem, researchers have proposed controlled …
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Lectures in transition : a study of communicative practices in the humanities in a South African university
The lecture is usually seen as an anachronism, out of step with contemporary trends in student learning and communication. However it remains a defining space in higher education, particularly in the first year experience. This study is a re-description of the lecture; it explores the tensions and …
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Industrial Firm Technology Transfer: The role of marketing
… on marketing concepts and frameworks that are out of step with practice in a new economy environment presents a particular problem for industrial marketers intent on extracting revenue from firm technology transfer effort, and is a challenge for marketing scholars seeking to bridge the gap …
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The crystal chemistry of titanite
The chemical substitutions of primary importance in natural titanites are (Al,Fe)<sup>3+</sup> + (F,OH)<sup>-</sup> ⇆ T<sub>1</sub><sup>4+</sup> + O<sup>2-</sup> , where total Al + Fe is not greater than 30 mol % and Al is usually predominant. Electron microprobe analyses and bond strength …
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Just Deserts: Losing Origen and Gaining Retributive Judgment in the Hagiographical Literature of the Early Byzantine World
The rise in production and distribution of Christian Hagiography in the Early Byzantine Empire points towards a unique moment in Christian History. The role of the saint was moved from the margins to a central and dynamic position within the church hierarchy and broader religious landscape. Meeting …
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The Purchase of the Past: The Elizabethan Past and the uses of History in Eighteenth-Century Britain
“The Purchase of the Past: The Elizabethan past and the uses of history in eighteenth-century Britain” examines the place of the late sixteenth-century Elizabethan and Shakespearean pasts in eighteenth-century popular culture and politics. Through an analysis of five moments, three times at which …
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