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Power transformers represent the largest portion of capital investment in transmission and distribution substations. One of the most important parameters governing a transformer’s life expectancy is the hot spot temperature value. The aim of this paper is to introduce hot-spot and top-oil temperature model as top oil and hot spot temperature rise over ambient temperature model and thermal model under...
The biological effects of extremely low frequency magnetic fields (ELF MFs) on living organisms have been explored in many studies, but few of them investigate the combination effect of both magnetic and electric fields act upon their growth. In this study, the biological effects of electric and magnetic field on the early growth of plants are presented using different beans. The electric and magnetic...
Grounding system behavior under transient condition is investigated. Transmission line approach has been chosen to simulate the buried grounding system under lightning condition. Different models of buried grounding grids have been studied under lightning conditions. Sensitivity analysis of soil parameters and grounding grid dimensions have been studied to understand the effect of each parameter on...
A detailed analysis of potential profile at a surface above energized unequally spaced grounding grid has been carried out, for soils with multiple layers. Exact and approximated algorithms are used to obtain the voltage profile and then to calculate the step and touch voltages. The analysis shows that the voltage distribution is highly dependent on soil structure type and characteristics and also...
This paper introduces a comparative study between conventional speed controllers of DC motor and an artificial intelligent speed controller showing the advantages of artificial intelligent controller over the conventional ones. All conventional controllers are implemented practically using a data acquisition card. Practical results are compared with simulation results for conventional controllers...
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