توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱DRY BAND FORMATION AND ITS EFFECT ON PERFORMANCE OF UHV SURGE ARRESTERS
نویسنده(ها): ،
اطلاعات انتشار: هفتمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۵
The metal oxide varistors are used as voltage dependent switching devices to protect high voltage equipments and also low voltage electronic devices against transient over–voltages. The performance of Zno Surge Arrester (SA) is determined by the electrical and, thermal properties of metal oxide elements, insulating materials used and design features of SA. The primary consideration in applying Metal Oxide SA is the thermal consideration of environment. Ambient temperature and environmental conditions effect directly on the performance of, internal current drawn by and energy input to the Metal Oxide SA. The interaction between the polluted porcelain housing and the inner varistor columns due to capacitive coupling is responsible for temperature rise of varistor element. Metal Oxide SAs are exposed to heavy thermal and electrical stresses if the porcelain housings of the units are polluted by industrial dusts, coastal salts and etc. The first part of this paper proposes an electrical model of SA that is computer simulated and the second part presents the results of pollution tests and the effect of dry band on the performance of S.<\div>

۲An Excursion into Solar Photovoltaic Energy
نویسنده(ها):
اطلاعات انتشار: چهاردهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۱
The production of electricity f rom photovoltaics(PV) continues to attract worldwide interest, most recently as a power source for distributed energy generation. Today's photovoltaic systems are already being used effectively for smaller power needs in remote applications.
The objectives of this paper are to review the photovolt aic energy technology, manufacturing, cost, current status and future prospects for solar PV energy in the context of overall energy trends and market development. The paper focuses on photovoltaic energy, not only because of the author's background but also because the author believes the development of the market for PV–energy raises the key issues facing all renewable sources of energies.<\div>

۳A numerical approach for size optimization and performance prediction of solar PV–hybrid power systems
نویسنده(ها): ،
اطلاعات انتشار: شانزدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۲۲
Iran is blessed with an abundance of sunlight almost all year round. So obviously, with the right planning and strategies that are coupled to the right technology and development in the market, the potential for the new renewable energies, specially solar photovoltaic, as an alternative source of power looks promising and is constantly gaining popularity. Development and application of new renewable energy in Iran, however, is still in its infancy and will require active support by government, utilities and financing institutions. Some experts might argue that Iran has plenty of natural resources like oil and gas. We should not forget, however, that even in countries with cheap fossil energy, the PV system is an economical option in supplying electricity for remote located communities and facilities. But there are good reasons suggesting that like many other countries in the world, Iran also needs to be active in utilization of sun energy. The objectives of this paper are:
• to give a comprehensive overview on the current solar photovoltaic energy technology. (Authors of this paper believe that Photovoltaic is the most appropriate renewable energy technology for Iran);
• to present the results obtained from a study which has been carried out on the size optimization, cost calculation of the photovoltaic systems for climate conditions of Iran.
The method presented in this paper can be used for systems of any size and application. A further objective of this paper is to present a numerical approach for evaluating the performance of PVHybrid power systems. A method is developed to predict the performance of all
components integrated into a PVhybrid system. The system under investigation is a hybrid power system, in which the integrated components are PV array, a battery bank for backing up the system and a diesel generator set for supporting the battery bank. State of charge (SOC) of batteries is used as a measure for the performance of the system. The running time of diesel generator is determined by the SOC of betteries. In this method it is shown that the usage of PV electricity is maximized, the size of the components is optimized and the amount of fuel used for the diesel generator is minimized. In this paper the system configuration and performance of the components are presented. Simulation results will also be presented for the purpose of evaluation of the system's performance of a PV powered remote located facility.<\div>
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