نتایج جستجو برای: electric power system protection
تعداد نتایج: 2812363 فیلتر نتایج به سال:
in the area of automotive engineering there is a tendency to more electrification of power train. in this work control of an induction machine for the application of electric vehicle is investigated. through the changing operating point of the machine, adapting the rotor magnetization current seems to be useful to increase the machines efficiency. in the literature there are many approaches wh...
The electric field in cavity accelerates charged particles and magnetic field of magnets changes the direction of these particles in cyclotrons. In order to establish the electric field inside the cavity, a noiseless radio frequency (RF) signal should be generated, amplified and sent to cavity. The resonant frequency of the cavity could be changed by temperature variation. Variation of resonant...
حفاظت سریع و مطمئن شبکه های قدرت حین بروز خطاها و نیز سایر اغتشاشات شبکه، به منظور حفظ پایداری و محدود کردن خسارات وارده به سیستم یکی از مهم ترین موضوعاتی است که مهندسین برق در بهره برداری از سیستم های قدرت با آن مواجه هستند؛ از این رو مطالعه سیستم های حفاظتی در شبیه سازی ها از اهمیت ویژه ای برخوردار است. از طرف دیگر اثر نوسان کمیت های مختلفِ شبکه حین بروز اغتشاشات مختلف را نیز بایستی در تنظیم...
This paper describes an inverter-interfaced distributed generation system that is interconnected with the electric power system. This system has two main goals: to serve customers with reliable electric power and to improve power quality. This system is interfaced through inverters because they are effective to control output voltage and current. Because DGs are interconnected with the electric...
differential steering of in-wheel electric vehicle provides the functions of both active steering and power assisted steering with the coupling control of force and displacement transfer characteristic of system. a collaborative optimization model of the differential power-assisted steering system of in-wheel electric vehicle is built, with steering economy as the main system optimization goal,...
Introduction Power systems have undergone a great deal of change in the past decade. The United States electric power grid was deregulated in the late 1990’s. As a result, it is increasingly operated with smaller generation reserves and more transmission congestion. If deregulation continues, it seems likely that power flows will be larger and will fluctuate to a greater extent in future years....
هدف از این پروژه هماهنگی عناصر حفاظت شبکه توزیع می¬باشد. از آنجاییکه شبکه توزیع مستقیما به مصرف کننده متصل می باشد، حفاظت بهینه شبکه توزیع می¬تواند درکاهش قطعی برق و افزایش قابلیت اطمینان و افزایش عمر تجهیزات نقش بسزایی داشته باشد. دریک سیستم توزیع عناصر حفاظتی شامل رله های جریان زیاد، فیوزها، کلید بازبستها، جداکننده ها و کلیدها می باشند که باید به نحو مناسب با هم هماهنگ شوند. این مسئله شامل هم...
The National Fire Protection Association (NFPA) Standard for Healthcare Facilities (NFPA 99) requires that wet location patient care areas be provided with “special protection against electric shock.” This paper will list the hazards associated with electric shock and the interruption of electrical power. An Isolated Power System (IPS) is one way of providing such protection, and has the inhere...
Protection practices in electric utility industry as it existed prior to re-structuring were designed to meet certain goals of sound engineering principles as they were applied, primarily to component protection in vertically integrated electric utility systems. There has been a significant shift in emphasis from uncomplicated component protection to system protection to avoid or mitigate wide-...
Malfunction of relay protection is one of the main causes of the serious failures that periodically occur in power systems all over the world. According to the North American Electric Reliability Council [1] in 74 % cases the reason for heavy failures in power systems was the incorrect actions of relay protection in trying to avoid the failure. Thus the reliability of a power system depends on ...
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