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 21 for “"Protective devices"”.
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Facial protective devices for blast-induced traumatic brain injury mitigation
… model of a helmet with various additional protective devices and to investigate how the personal protective equipment system affects the mechanical response of a human head subjected to a blast. Finite element models of the helmet with and without faceshields and goggles were developed from …
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The optimal placement of switching devices on rural medium-voltage systems
… difficult and increases customer outage time. Protective devices such as reclosers, sectionalisers and fuses are place on distribution systems to reduce the number of customers that will not have service at one time or another due to any fault on the system. There do not appear to be clear …
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Computer simulation programs to systematically screen protective relay applications for electric power distribution
… or sets, which, in-turn, automatically inject protective devices. Part of the aim of the research has been to standardise the application tests, so that the testing of each device does not require a large number of calculated settings. The set of application tests simulate various network …
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An expert system for protection system design of interconnected electrical distribution circuits
… the coordination, placement and selection of protective devices are presented that are used to dynamically, incorporate expert knowledge into the knowledge base. The protection system designer controls which rules are implemented in the design. An example protection system design is presented …
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Modern Adaptive Protection and Control Techniques for Enhancing Distribution Grid Resiliency
… adaptive protection schemes. The most common protective devices widely deployed in the distribution system such as overcurrent relays, reverse power relays at Point of Common Coupling(PCC), fuses, reclosers and feeder breakers need to studied in implementing these schemes. The work presented …
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Dynamic Deformation and Mechanical Properties of Brain Tissue
… the mechanics of brain injury and to design protective devices. However, because of a lack of quantitative data on brain-skull boundary conditions and deformations, the predictions of mathematical models remain uncertain. The objectives of this dissertation are to develop methods and obtain …
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Accurate frequency estimation with phasor angles
… It is the responsibility of the monitoring and protective devices to detect and restore the system to the equilibrium operating condition at the nominal frequency as soon as it is practical to do so. An accurate measurement of both frequency deviation and rate of change of frequency will greatly …
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A Novel Inverter Based Resource Control Strategy to Facilitate Utility-Scale Renewable Integration and Retain Existing Transmission Protection Infrastructure
… faulted conditions may change to the point where protective relays may fail to accurately detect the location of a fault. This thesis proposes a novel control strategy for utility-scale inverter-based resources designed to ensure proper operation of the existing transmission-line protection …
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Voices from the Hinterland: lesbian women's experience of Irish health care
… set up barriers to communication utilising protective devices to protect the self from exposure to Others. Lesbian nurses recall being set apart with their difference exposed for them to see as well as the tactics they utilise to negatc the effect of being Othered. They remain hidden, …
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The Advancement of Adaptive Relaying in Power Systems Protection
… disconnection of lines, transformers, or other devices with the purpose of isolating the faulted element. On some occasions, the disconnections made were not necessary. The other extreme of reliability calls for security. This aspect of reliability calls for the operation of the protective …
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An Analysis and Response to the Fear of Evil Spiritual Forces Among Kamba Christians in the Light of Biblical and Ellen G. White Teachings
… often so great that born-again Christians carry protective devices and practices which they believe will ward off the invading evil spiritual forces.</p> <p>The Old Testament writings were examined to see how God wanted His people to relate to any evil power. The Old Testament teachings on such …
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A direct current differential relay
… occur which will not be indicated by ordinary protective devices, but which will affect motor operation or create unsafe conditions. All such faults are manifested by the fact that the current in one lead supplying the motor will be greater than that in the other. This current differential can …
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Design of an intelligent system for validation of protection settings
… systems depends on the correct settings of protective devices, which can be extremely numerous and complex within modern protection schemes. It has been realised that, despite multiple instances of checking, and verification and quality control processes, setting errors may remain undetected …
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Failure Finding Interval Optimization for Periodically Inspected Repairable Systems
… such failures. Examples of these systems include protective devices, emergency devices, standby units, underwater devices etc. If no periodical inspection is scheduled, and a hidden failure has already occurred, severe consequences may result. Research on periodical inspection seeks to establish …
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An Examination of Headset, Hearing Sensitivity, Flight Workload, and Communication Signal Quality on Black Hawk Helicopter Simulator Pilot Performance
… decreased, and that assistive communication devices coupled with headsets would afford improved flight performance over their passive counterpart. It was also hypothesized that normal-hearing pilots would perform better than hearing-impaired pilots would. Twenty Army helicopter pilots (one …
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Assessment of myocardial viability using magnetic resonance imaging
… small microemboli, which may escape the distal protective devices, influence cardiac function. Study II demonstrated that infarct quantification with a 2D-PSIR and a 3D-IR sequence shows good agreement in patients, which allows for the sequences to be used interchangeably. Both these …
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Biomechanical analysis of traumatic brain injury by MRI-based finite element modeling
… tool to aid in injury diagnosis and design of protective devices. Many FE head models with various degrees of simplification have been developed in the past several decades. There are, however, two common problems with the existing models. First, the mesh generation method is often …
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Applying the Health Belief Model to Michigan motorcyclist helmet use
<p>Helmets can offer significant injury protection to motorcyclists, yet usage is inconsistent across the United States. In 2012, the state of Michigan switched from a universal helmet law to partial helmet law. Michigan motorcyclists (<em>n</em> = 76) were recruited through two motorcycling events …
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Posouzeni bezpečnostních rizik zásobníku plynu a benzínu a postupu při jejich revizí
Bakalářská práce se zábývá problematikou provadění revize u zásobníků plynu a ropných produktů. Úkolem práce je vysvětlit existence bezpečnostních rizik u zásobníků plynu a ropy, a vyznačit způsoby jejich eliminace. Dalším cílem je zpracovat postup revize vybraného druhu zásobníku, včetně termínu …
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Protection-based Distributed Generation Penetration Limits on MV feeders - Using Machine Learning
… designed for bi-directional power flow, thus the protective devices in the network lose their ability to perform their main functions. To mitigate the impact of distributed generation (DG), some standards and policies constrain the number of DG that can be connected to the distribution network. …
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