Дисертації з теми "Electric power facilities"

The purpose of this research was to determine if installing a smaller air compressor could reduce the electrical usage of a large semiconductor manufacturing plant. A 200 horsepower Atlas Copco compressor was installed with the existing 500 horsepower Ingersoll-Rand compressors. Testing was conducted during the regular manufacturing process at MEMC Southwest in Sherman, Texas. Analysis of the data found that installing the new compressor could reduce electrical consumption. The study also found there are specific operational setpoints that allow the compressor to operate more efficiently.

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.14.02 – електричні станції, мережі і системи. – Національний технічний університет "Харківський політехнічний інститут", Харків 2016. Дисертаційна робота присвячена вирішенню актуального науково-технічного завдання вибору параметрів ефективних засобів блискавкозахисту електроенергетичних об'єктів за допомогою вдосконалених моделей електрофізичних процесів на фінальній стадії руху лідерного каналу блискавки до землі з урахуванням можливості появи зустрічного лідера від наземних об'єктів. За допомогою фізичного та математичного моделювання електрофізичних процесів розвитку електричного пробою у системах з заземленими електродами, що мають загострені або округлені вершини, доведено, що наявність або відсутність корони, а також її інтенсивність, пропорційна току корони, не оказує впливу на імовірність поразки заземленого електрода високовольтним розрядом при рівнях прикладеної постійної напруги, що відповідають умовам грозової обстановки. Запропоновано статистичну модель для визначення імовірності удару блискавки в електроенергетичні об'єкти з урахуванням їх висоти і габаритів, а також можливості розвитку від них зустрічної іскри. Ця модель заснована на використанні експериментальних даних щодо параметрів блискавок, а також процесів при пробої довгих повітряних проміжків. Наведено результати експериментальних досліджень кореляції між інтенсивністю коронування заземленого електрода (імітує блискавковідвід за умови грози) та імовірністю влучення в нього високовольтного імпульсного розряду (імітує удар блискавки).
Thesis for scientific degree of candidate of technical sciences, specialty 05.14.02 – electrical power stations, networks and systems. - National Technical University "Kharkov Polytechnic Institute", Kharkov 2016. The thesis is devoted to solution of modern scientific and technical problem of choosing of the parameters of effective means of lightning protection of electric power facilities using advanced models the electrical processes in the final stages of motion of leader channel of lightning to the ground with regard of the possibility of appearance of an ascending leader from grounded objects. A statistical model for determination of the probability of lightning strokes at objects on the ground, taking into account their height and size, as well as probabilities of development of ascending sparks from them, based on the usage of experimental data on the parameters of lightning and the electrical physical processes at breakdown of long air gaps has been proposed. The results of experimental studies of the correlation between the intensity of corona from earthed electrodes (simulate a lightning rod in a thunderstorm situation) and probability of being hit by a high-voltage impulse discharges (simulate lightning strike) have been presented.

Диссертация на соискание ученой степени кандидата технических наук по специальности 05.14.02 – Электрические станции, сети и системы. – Национальный технический университет "Харьковский политехнический институт", Харьков 2016. Диссертационная работа посвящена решению актуальной научно-технической задачи выбора параметров эффективных средств молниезащиты электроэнергетических объектов с помощью усовершенствованных моделей электрофизических процессов на финальной стадии продвижения лидерного канала молнии к земле с учетом возможности появления встречного лидера от заземленных объектов. В диссертации обоснована цель и актуальность проводимых исследований, проведен обзор известных из литературы экспериментальных данных о параметрах лидерного канала молнии при высоковольтном разряде. Проведен анализ существующих методов моделирования электромагнитных процессов при продвижении лидерного канала молнии к земле, а также методов расчета электрического поля в системах с тонкими длинными проводящими объектами типа разрядных каналов и проводящих стержней. Предложена статистическая модель для определения вероятности удара молнии в электротехнические объекты с учетом их высоты и габаритов, а также возможности развития от них встречной искры, основанная на использовании имеющихся данных о параметрах молний и электрофизических процессах при пробое длинных воздушных промежутков. Компьютерное моделирование процессов, сопровождающих продвижение лидерного канала молнии на последнем этапе перед "выбором" места удара заземленного объекта, позволило определить прогнозируемое число поражений молниеотводов и защищаемого нестандартного электротехнического объекта (цистерны с нефтепродуктами). При этом оценена степень влияния числа используемых молениеотводов на вероятность поражения защищаемого объекта, а также показано, что применение тросовых молниеотводов выбранной конфигурации позволяет практически исключить попадание молнии в рассмотренный объект в течение всего срока его эксплуатации.
Thesis for scientific degree of candidate of technical sciences, specialty 05.14.02 – electrical power stations, networks and systems. - National Technical University "Kharkov Polytechnic Institute", Kharkov 2016. The thesis is devoted to solution of modern scientific and technical problem of choosing of the parameters of effective means of lightning protection of electric power facilities using advanced models the electrical processes in the final stages of motion of leader channel of lightning to the ground with regard of the possibility of appearance of an ascending leader from grounded objects. A statistical model for determination of the probability of lightning strokes at objects on the ground, taking into account their height and size, as well as probabilities of development of ascending sparks from them, based on the usage of experimental data on the parameters of lightning and the electrical physical processes at breakdown of long air gaps has been proposed. The results of experimental studies of the correlation between the intensity of corona from earthed electrodes (simulate a lightning rod in a thunderstorm situation) and probability of being hit by a high-voltage impulse discharges (simulate lightning strike) have been presented.

Em todos os segmentos da sociedade, a utilização de equipamentos eletrônicos projetados e construídos com avançadas tecnologias eletrônicas e controlados por microprocessadores aumenta a cada dia. Na área de saúde, denominados de equipamentos eletromédicos, dão suporte aos setores de diagnóstico, tratamento ou, procedimento cirúrgico, melhorando a qualidade dos serviços e o atendimento aos pacientes. No entanto, o sucesso global do processo deverá considerar a qualidade das instalações elétricas nesses ambientes, bem como a qualidade da energia elétrica fornecida a esses equipamentos. Este trabalho tem como objetivo comprovar, por meio de pesquisa em laboratório, o risco de diagnósticos médicos baseados em informações fornecidas por equipamentos eletromédicos, alimentados em redes elétricas que não atendem às normas vigentes ou, totalmente perturbadas por outros equipamentos típicos dos ambientes médico-hospitalares. A metodologia aplicada consistiu em medições dos parâmetros referentes à qualidade de energia elétrica nos estabelecimentos assistenciais de saúde. Atenção especial foi dada ao conteúdo harmônico de tensão e aos afundamentos de tensão de curta duração produzidos por equipamentos de raios X, mamografia, tomografia computadorizada, ressonância magnética nuclear e motores elétricos de indução. Em seguida, essas perturbações foram reproduzidas em fontes de tensão específicas para essa finalidade, instaladas no Laboratório do Centro Tecnológico de Qualidade de Energia da Escola Politécnica da Universidade de São Paulo, conhecido como Enerq-ct. Equipamentos eletromédicos portáteis, gentilmente cedidos por diversos fabricantes nacionais, foram submetidos a esses sinais para verificação do seu desempenho. Os resultados obtidos demonstram a importância da qualidade de energia elétrica bem como, a qualidade dos serviços de manutenção nas instalações elétricas desses ambientes.
Through all segments of our society, there is a daily increase in the use of electronic equipment designed and built with advanced electronic technology and computerized control. In the health-medical area, designated electromedical equipment, they provide support to sectors in charge of diagnosis, treatment or surgical procedures, improving the quality of services and the manner patients are cared for. However, the global success of this process must take into consideration the quality of electrical installations at these facilities, as well as the electrical power supplied to the equipment. The aim of this work is to attest through laboratory research the risk of medical diagnoses based on information provided by electromedical equipment powered through electrical networks which do not meet the standards in effect, or which are completely disturbed by other equipment typical of electromedical environments. The methodology applied consisted of measurements of the parameters referring to the quality of electrical power in health care facilities. Especial attention was given to the voltage harmonic content and to short duration voltage sags caused by X-ray, mammography, computerized tomography and nuclear magnetic resonance equipment or by induction motors. Later, these disturbances were reproduced in power supplies which are specific to this objective, installed at Laboratório do Centro Tecnológico de Qualidade de Energia da Escola Politécnica da Universidade de São Paulo- Energy Quality Technological Center of the Technical School of the University of Sao Paulo , known as Enerq-ct. Portable electromedical equipment, kindly supplied by national manufacturers, were subjected to these signals for assessment of their performance. The results obtained demonstrate the importance of the quality of electrical power as well as the quality of maintenance of electrical installations within these environments.

Cette thèse s'inscrit dans le contexte de la production et de l'utilisation du vecteur énergétique hydrogène dont le potentiel est très prometteur dans un paysage énergétique renouvelé. Plus exactement, cette étude traite des électrolyseurs et des piles à combustible de technologie PEM (membranes échanges de protons) fonctionnant à basse température. Dans une très large majorité, les études présentées ici se sont inscrites en partenariat étroit avec HELION Hydrogen Power, notamment dans le cadre du projet ANR AIRELLES (2008- 2011). Tout d'abord sont posées les bases de modèles (quasi-statique, dynamique petits signaux, dynamique forts signaux) génériques et applicables à une pile à combustible et à un électrolyseur. Les méthodologies de caractérisation ainsi que les techniques de paramétrisation de ces modèles utilisées sont ensuite exposées. L'intérêt de croiser toutes ces approches pour caractériser au plus juste les composants est illustré. A partir de cette vision commune des deux composants, le document est scindé en trois parties : - Une première partie porte sur une validation et une exploitation des modèles proposés via différentes études sur des piles à combustible alimentées en H 2 /air : 1) La recherche de signatures d'un engorgement et d'un assèchement d'une pile alimentée en H 2 /air. Ces signatures sont comparées à celles d'une pile alimentée en H 2 /0 2 . 2) L'analyse des impacts d'harmoniques de courant hautes fréquences (représentatives d'un convertisseur continu-continu de type boost) sur un cœur de pile. Ces travaux s'inscrivent dans le cadre d'une collaboration avec le laboratoire FEMTO-ST/FCLAB (projet CNRS CO-CONPAC). - Une seconde partie porte sur la validation et la paramétrisation des modèles proposés pour l'électrolyseur. Deux techniques originales ont été proposées et testées : la première consiste en une approche multispectres d'impédance et la seconde en une approche multibalayages basses fréquences. - Une troisième partie décrit les moyens d'essais qui ont été conçus et déployés au cours de cette thèse aboutissant à une plateforme significative de tests dédiée à l'hydrogène sur le site l'INPT (Toulouse Labège).

碩士
國立臺灣科技大學
電機工程系
90
This thesis is to study Magnetic-field Shielding for Electric Power Facilities. For this study, FLUX3D has been applied to evaluate the magnetic-field shielding properties of metal plates for reducing magnetic-field coupling interferences due to three-phase power inductances. Also, measurements and mitigations of surrounding power frequency magnetic fields produced by a substation in a commercial building have been performed. The major sources of the 60Hz magnetic fields come from the currents of the low-voltage cables in substation. To mitigate the magnetic fields, the power cables are bundled together with suitable phase arrangements, so that the magnetic fields from the three-phase currents may cancel each other. However, there are still some minor magnetic sources in the substation, and to further reduce their effects, aluminum plates are used to shield the magnetic fields, where FLUX3D has been applied to simulate and design the shielding structures. Besides, the effects of the electromagnetic interferences for the communication system of the automatic feeders are also studied. Low-frequency magnetic fields around the equipments of the communication system are measured. Then, an experimental setup is established to test the electromagnetic interference and susceptibility for the communication system. Also, the Electromagnetic Transients Program (EMTP) has been applied to determine the longitudinally magnetic-field induced voltages from power lines to communication cables for the communication system of the automatic feeders.

碩士
國立中正大學
法律所
98
When Electric Power Utilities erect power transmission or distribution facilities, depriving or damaging the property rights of the land owners is unavoidable. However, power facilities relate to public interests, especially power transmission & distribution facilities .Therefore, most countries empower electric power utilities to use both public and private lands by law which means that land owners are obligated to endure trespassing or infringing of their lands and property rights. Nevertheless, if the restriction to property goes beyond social obligation boundaries of the property, then it falls into the scope of special sacrifices and shall be adequately compensated. According to the law, when power utilities mount or lay pipelines, cables on /in or under other people’s land or building, they exercise rights of neighbors which is of a private law nature instead of exercising public power. People’s worries of insecurity and their feelings of unfairness comes due to power transmission or distribution facilities are within the scope of private law. There are regulations of Compensation for mental suffering of private nature in Civil Law, compensation for mental suffering due to power transmission or distribution facilities would be treated as the same(insecurity and environmental injustice). There are a few problems with the compensation and feedback system and practices of the existing electric power utilities and thus bring about endless protests so far. If separating superficies, underline compensation, legalization of feedback, enhancing communication and participation adopted, to make people actually experience and aware of the benefits of power utilities and good intentions, resolution to the avoiding complex and protests of the residents close by would be possible, and thus this will also help create of a win-win situation between electric power utilities and the local population.

碩士
國立宜蘭大學
電機工程學系碩士班
98
Recently, the concept about “Smart home” has been discussed in lots of research literature. The aims of these researches are mainly on the expectation to combine the network communication system, the mobile communication system with the intelligent housing electricity system to facilitate the life style at home for human beings. That is, the multi-functional easy living environment with automation, security, and entertainment is highly expected through the “Smart home” discussion. This idea is also pointed out as the living standard of WHO (World Health Organization) with the emphasis on the security. By using the hardware and software to achieve the fantastic living, the artificial intelligence is fully implemented in the human beings’ life. In this paper, an intelligent power switch system is studied in the first year to switch between the solar energy storage power system and the regular power system to save energy for the low dissipated electricity equipment. Moreover, the weather forecast information is incorporated into the proposed intelligent power switch system. Then, the DC battery charged by the solar source at the day time can supply the low dissipated electricity equipment at night. Hence, the solar energy storage power system is efficiently used.

碩士
國立臺灣科技大學
工業管理系
102
This investigation evaluates the utilization efficiency of electrical grid facilities in 6 regional branches of transmission system and 21 regional branches of distribution system of Taiwan Power Company by applying Data Envelopment Analysis. The investigation reveals that 4 transmission branches and 16 distribution branches do not have productive efficiency. And among them, 2 transmission branches and 11 distribution branches do not have technical efficiency also. All of these branches should take effort to reduce their quantity of facilities to improve efficiency, and 8 distribution branches could also increase their electricity sales. None of transmission branches is under decreasing returns to scale. And the smaller distribution branches tend towards increasing returns to scale, but the bigger distribution branches tend towards decreasing. The investigation suggests that part of the regional electrical grid expansion plans could be held or canceled, and some of the systems could be split or moved between the branches to promote efficiency.

This dissertation uses multilevel modeling to examine the effects of corporate and community characteristics on rates of sulfur dioxide emitted by facilities in the electrical power industry. The conceptual framework draws from ecostructural theory to emphasize the social-structural causes of pollution. It also draws from organizational resource dependence theory and the shareholder conception of value. This framework suggests the contemporary transformation in corporate form and the changes in the basic relationship between the corporation and its shareholders have created dependencies, opportunities, and incentives that affect pollution. At the local community level, the conceptual framework also draws from theoretical insights of environmental justice scholars and other scholars in the environmental sociology and social-movement literature. The power plants examined in this dissertation are owned by the largest corporations in the electrical power industry and are located in many different communities across the United States. The multilevel models include three corporate characteristics and four local community characteristics as independent variables. They also include several facility and local community characteristics as control variables. In accordance with ecostructural theory, the findings demonstrate that the total number of subsidiaries in the corporate structure and the dividend payments to shareholders have significant positive effects on the power plant emissions rates. The analysis of community demography shows that relationships involving the power plant emissions rates and percent African Americans, percent families in poverty, and median home values are contingent on the geographic unit of analysis. Hence, the demographic analysis does not consistently support any theory of environmental inequality. On the other hand, all models show that the prevalence of non-profit organizations in the county has a significant negative effect on the power plant emissions rates. This follows in accordance with both ecostructural theory and the path of least resistance theory that underpins the sociopolitical model of environmental inequality. Lastly, all models show that facility control variables involving size, age, and fuel mix have significant effects on the emissions rates. In sum, this dissertation brings together and simultaneously tests theoretical insights from several lines of research to demonstrate that different levels of social structure explain environmental pollution.