Omar Kherif

6 Questions 15 Answers 0 Followers

Questions related from Omar Kherif

Why Protecting Wind Turbines from Lightning is Critical?

Since the wind turbine has a tall structure, it is more affected by lightning than others. We can distinguish several paths of lightning current to the wind turbine generator and to protect these...

05 May 2017 1,807 4 View

How to calculate the apparent resistivity in the cases of; horizontal and vertical electrodes?

The most commonly used soil models are the uniform and the two-layer soil model. In actual occasions, homogeneous soil rarely exists, and the result of measurement usually obtained is apparent...

20 February 2017 5,919 6 View

The critical electric field of the earth, can be considered as a calibrating parameter ?

Hi all The dynamic response of the grounding electrodes subjected to such current pulses is predominantly influenced by same physical processes, which are related to the soil ionization in the...

14 December 2016 8,031 1 View

Is there any expressions or explanation of corona effects in high-frequency ?

Hi all Is there any expressions or explanation of corona effects in high-frequency ? I need theorical or experimental works. Thank you, Omar

12 November 2016 1,161 6 View

What is the good parameter which can be used to analyse the impulse performance of grounding system?

Hi all The behaviour of grounding systems under impulse currents associated with lightning return strokes can be very different from the low-frequency behaviour. This difference should be...

09 November 2016 8,446 12 View

Expressions and relationship for the lightning frequency in frequency-dependent of soil parameter models?

It was found in some research that the frequency dependence of soil parameters is accountable for affecting the grounding potential rise of electrodes. For this purpose, many models have been...

09 October 2016 5,896 3 View