احمد غلامی

[ 1 ] - تحلیل توزیع میدان الکتریکی در مقره‌های پلیمری تحت شرایط یخ‌زدگی با استفاده از روش المان محدود

[ 2 ] - بررسی جامع اضافه‌ولتاژهای صاعقه در مزارع بادی با پیکربندی‌های متفاوت به همراه تاثیر سیستم زمین

This paper is treated with major risks applied by lightning strikes to wind farms. The risks illustrated in this research include overvoltage caused by direct and indirect effects of lightning strikes on any components of wind farm. As demands for electrical energy throughout our world is increased more and more nowadays, wind power plants are extended in every possible locations correspondingl...

[ 3 ] - مکان یابی برقگیر در مزرعه بادی به کمک الگوریتم ژنتیک

Due to the ever-increasing use of Distributed Generations (DGs), and special attentions toward wind power plants in recent years, this research investigates the wind plants from the viewpoint of lightning protection. In comparison to all other type of generators connected to the electric power systems, wind turbine generators are placed in areas which are more likely to be stricken by lightning...

[ 4 ] - Investigating Characteristics of N2, CO2 and CF3I in Contrast to High Current Arcs in Circuit Breakers to Choose a Suitable Substitute for SF6

Specific and sensitive operation of circuit breakers makes an individual position for them in power networks. Circuit breakers are at the central gravity of variations and execution operations. Therefore, an optimum operation is the main reason to investigate about new gases to be used in MV and HV circuit breakers instead of SF6. The arc process has enormous complexity because of hydrodynamic ...

[ 5 ] - Mitigation of Transient Overvoltages Generated Due to Switching Operations and Lightning in Gas-insulated Substation (GIS) Without Extra Limiter

Gas-insulated substations (GIS) have different specifications in proportion to air-insulated substations. Transformer failures related to lightning and switching are often reported in the gas insulated substation (GIS). This problem is the voltage magnifications due to reflections of switching and lightning surges at various junctions within the GIS. thereby overvoltages in GIS are more importa...

[ 6 ] - A Theoretical and Experimental Investigation for a New Reduced & Reliable Life Time Estimation Method of Insulating Materials

Abstract: The big share of electrical breakdown in electrical devices failure among other factors is caused by multitasking such as electrical insulation, mechanical support, energy dissipation, Energy storage, etc. which brings many attentions to lifetime estimation of said insulation material. Up to now, there was no-general theory had been suggested for lifetime estimation of mentioned insul...

[ 7 ] - کنترل ولتاژ تماسی ریل در سیستم‌های حمل و نقل ریلی برقی با تغذیه DC

Most modern DC electrified railway systems use a totally floating earth as their grounding strategy. A well-known problem related with totally floating systems is that the touch potentials can be dangerously high. In order to reduce the voltages on rails, several devices exist. Most of these devices allow a direct connection to earth when a certain voltage threshold is exceeded. In this paper, ...