On the effect of the finite ground conductivity on electromagnetic field radiated by lightning to tall towers

• In this paper it is shown how the finitelyconducting ground modifies the signature of the radiationfield of return strokes striking tall towers. Results arepresented for different tower heights and for differentground conductivities varying the current risetime in thereturn stroke model. The results show that the attenuationof the initial peak of the radiation field resulting from thepropagation over finitely conducting ground dependsstrongly on the current risetime, the tower height and theground conductivity. In general, the attenuation of theradiation field of lightning flashes striking tall towers islarger than that striking flat ground. In the case where theground conductivity is extremely poor, namely 0.0001 S/m,the attenuation of the peak radiation field may reach asmuch as 70% in the case of lightning flashes striking a 300-m tall tower.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Electromagnetic fields

lightning to tall towers

numerical modeling

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)